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Bài tập thủy phân một este đơn chức

Thủy phân 17,2 gam este đơn chức A trong 50 gam dung dịch NaOH 28% thu được dung dịch X. Cô cạn dung dịch X thu được chất rắn Y và 42,4 gam chất lỏng Z. Cho toàn bộ chất lỏng Z tác dụng với một lượng Na dư thu được 24,64 lít H2 (đktc). Đun toàn bộ chất rắn Y với CaO thu được m gam chất khí B. Các phản ứng xảy ra hoàn toàn. Giá trị của m là

Hóa học Tốt nghiệp THPT

Xem chi tiết 11.9 K lượt xem 6 năm trước

20 BỘ ĐỀ THI THỬ THPT QUỐC GIA LẦN 1 NĂM HỌC 2018 - 2019 MÔN: TIẾNG ANH(ĐỀ 11)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50. An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely. Air pollution requires a very flexible definition that permits continuous changes. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled - a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions. Many of more important air pollutants, such as sulfur oxides, carbon monoxides and nitrogen oxides are found in nature. As the Earth developed, the concentration of these pollutants was altered by various chemical reactions; they became components in biogeochemical cycles. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil. On a global basis, nature's output of these compounds dwarfs that resulting from human activities. However, human production usually occurs in a localized area, such as a city. In such a region, human output may be dominant and may temporarily overload the natural purification scheme of the cycles. The result is an concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact, the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0. 08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however has a natural level of 0. 1 ppm and is not usually a pollutant until its level reaches about 15 ppm.According to the passage, human- generated air pollution in localized regions ______.

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 552 lượt xem 6 năm trước

KỲ THI THỬ THPT QUỐC GIA NĂM 2019 MÔN TIẾNG ANH(P1)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 53 to 62.History books recorded that the first film with sound was The Jazz Singer in 1927. But sound films, or talkies, did not suddenly appear after years of silent screenings. From the earliest public performances in 1896, films were accompanied by music and sound effects. These were produced by a single pianist, a small band, or a full-scale orchestra; large movie theatres could buy sound-effect machines. Research into sound that was reproduced at exactly at the same time as the pictures – called “synchronized sound” – began soon after the very first films were shown. With synchronized sound, characters on the movie screen could sing and speak. As early as 1896, the newly invented gramophone, which played a large disc carrying music and dialogue, was used as a sound system. The biggest disadvantage was that the sound and pictures could become unsynchronized if, for example, the gramophone needle jumped or if the speed of the projector changed. This system was only effective for a single song or dialogue sequence.In the “sound-on-film” system, sound was recorded as a series of marks on celluloid which could be read by an optical sensor. These signals would be placed on the film alongside the image, guaranteeing synchronization. Short feature films were produced in this way as early as 1922. This system eventually brought us “talking pictures”.According to the passage, films using sound effects were screened_________ .

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 898 lượt xem 6 năm trước

Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P1)

Read the following passage and mark the letter A, B, C or D to indicate the correct answer.The medieval artists didn’t know about perspective; they didn’t want to make their people look like real, individual people in a real, individual scene. They wanted to show the truth, the eternal quality of their religious stories. So these artists didn’t need to know about perspective.In the European Renaissance period, artists wanted to show the importance of the individual person and his or her possessions and surroundings. A flat medieval style couldn’t show this level of reality and the artists needed a new technique. It was the Italian artist Brunelleschi who discovered the technique of perspective drawing. At first the artists of the Renaissance only had single-point perspective. Later they realized that they could have two-pointed perspective and still later multi-point perspective.With two-point perspective they could turn an object (like a building) at an angle to the picture and draw two sides of it. The technique of perspective which seems so natural to us now is an invented technique, a part of the “grammar of painting”. Like all bits of grammar there are exceptions about perspective. For example, only vertical and horizontal surfaces seem to meet on eye level. Sloping roof tops don’t meet on eye level.For 500 years, artists in Europe made use of perspective drawing in their pictures. Nevertheless, there are a range of priorities that artists give in displaying individual styles. Crivelli wanted to show depth in his picture and he used a simple single-point perspective. Cezanne always talked about space and volume. Van Gogh, like some of the other painters of the Impressionist period, was interested in Japanese prints. And Japanese artists until this century were always very strong designers of “flat” pictures. Picasso certainly made pictures which have volume and depth. However, he wanted to keep our eyes on the surface and to remind us that his paintings are paintings and not illusions.It is technically easy to give an illusion of depth. However, a strong two dimensional design is just as important as a feeling of depth, and perhaps more important. It can be inferred from the passage that Renaissance artists

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 1 K lượt xem 6 năm trước

20 BỘ ĐỀ THI THỬ THPT QUỐC GIA LẦN 1 NĂM HỌC 2018 - 2019 MÔN: TIẾNG ANH(ĐỀ 11)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50. An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely. Air pollution requires a very flexible definition that permits continuous changes. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled - a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions. Many of more important air pollutants, such as sulfur oxides, carbon monoxides and nitrogen oxides are found in nature. As the Earth developed, the concentration of these pollutants was altered by various chemical reactions; they became components in biogeochemical cycles. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil. On a global basis, nature's output of these compounds dwarfs that resulting from human activities. However, human production usually occurs in a localized area, such as a city. In such a region, human output may be dominant and may temporarily overload the natural purification scheme of the cycles. The result is an concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact, the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0. 08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however has a natural level of 0. 1 ppm and is not usually a pollutant until its level reaches about 15 ppm.For which of the following reasons can natural pollutants play an important role in controlling air pollution?

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 467 lượt xem 6 năm trước

20 BỘ ĐỀ THI THỬ THPT QUỐC GIA LẦN 1 NĂM HỌC 2018 - 2019 MÔN: TIẾNG ANH(ĐỀ 11)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50. An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely. Air pollution requires a very flexible definition that permits continuous changes. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled - a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions. Many of more important air pollutants, such as sulfur oxides, carbon monoxides and nitrogen oxides are found in nature. As the Earth developed, the concentration of these pollutants was altered by various chemical reactions; they became components in biogeochemical cycles. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil. On a global basis, nature's output of these compounds dwarfs that resulting from human activities. However, human production usually occurs in a localized area, such as a city. In such a region, human output may be dominant and may temporarily overload the natural purification scheme of the cycles. The result is an concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact, the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0. 08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however has a natural level of 0. 1 ppm and is not usually a pollutant until its level reaches about 15 ppm.The word “these” in the second paragraph is closest in meaning to _____.

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 366 lượt xem 6 năm trước

Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P1)

Read the following passage and mark the letter A, B, C or D to indicate the correct answer.The medieval artists didn’t know about perspective; they didn’t want to make their people look like real, individual people in a real, individual scene. They wanted to show the truth, the eternal quality of their religious stories. So these artists didn’t need to know about perspective.In the European Renaissance period, artists wanted to show the importance of the individual person and his or her possessions and surroundings. A flat medieval style couldn’t show this level of reality and the artists needed a new technique. It was the Italian artist Brunelleschi who discovered the technique of perspective drawing. At first the artists of the Renaissance only had single-point perspective. Later they realized that they could have two-pointed perspective and still later multi-point perspective.With two-point perspective they could turn an object (like a building) at an angle to the picture and draw two sides of it. The technique of perspective which seems so natural to us now is an invented technique, a part of the “grammar of painting”. Like all bits of grammar there are exceptions about perspective. For example, only vertical and horizontal surfaces seem to meet on eye level. Sloping roof tops don’t meet on eye level.For 500 years, artists in Europe made use of perspective drawing in their pictures. Nevertheless, there are a range of priorities that artists give in displaying individual styles. Crivelli wanted to show depth in his picture and he used a simple single-point perspective. Cezanne always talked about space and volume. Van Gogh, like some of the other painters of the Impressionist period, was interested in Japanese prints. And Japanese artists until this century were always very strong designers of “flat” pictures. Picasso certainly made pictures which have volume and depth. However, he wanted to keep our eyes on the surface and to remind us that his paintings are paintings and not illusions.It is technically easy to give an illusion of depth. However, a strong two dimensional design is just as important as a feeling of depth, and perhaps more important. The word ”Illusion” in line 27 is closest in meaning to

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 468 lượt xem 6 năm trước

Đề thi thử THPT Quốc Gia môn Tiếng anh năm 2020 (Đề số 7)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions The dream of a canal across the Isthmus of Suez had existed since the time 4,000 years ago when the pharaohs built Egypt's first canal. (It linked the Nile River with the Great Bitter Lake, which then opened onto the Gulf of Suez.) This canal, however, was filled in, and for centuries trade with the Far East was carried overland across Asia. Eventually ships began to sail around the southern tip of Africa to reach the Mediterranean Sea from the Red Sea. Then in 1858 a French engineer, Ferdinand de Lesseps, acquired the rights from his friend, Said Pasha, viceroy of Egypt, to organize a company and build a canal. On November 17, 1869, the Suez Canal was opened with great ceremony at the northern terminus, Port Said, which was named for Said Pasha. The 12,400-mile (19,950-kilometer) voyage from London around South Africa to Bombay, India, was shortened to 7,250 miles (11,670 kilometers).The Suez Canal is 101 miles (163 kilometers) long, or about twice the length of the Panama Canal. The Suez was easier to construct because it crosses flat, sea-level terrain and requires no locks. About 24 miles (39 kilometers) of the canal are channels dredged through lakes. Most of the banks of the other 77 miles (123 kilometers) are reinforced with stone, cement, or steel to help prevent erosion.The main channels of the canal are dredged to a depth of about 66 feet (20 meters), and the navigational width between buoys is set at 596 feet (180 meters). Double channels, where ships traveling in opposite directions can pass without stopping, have been constructed at four locations and cover a little more than 41 miles (67 kilometers). The largest ships allowed to pass through the canal may have a beam of up to 210 feet (64 meters) wide and a draught (belowwater depth) of up to 53 feet (16 meters).Ships move through the canal under their own power, but large ships must be accompanied by a tugboat. The trip takes roughly 12 to 18 hours. To prevent accidents, vessels must travel in convoys at fixed speeds, fixed intervals and fixed distances between passing ships. Convoys going in opposite directions are usually timed so they will pass each other in the Great Bitter Lake where there is a long double channel.Each day two convoys from south to north and one convoy from north to south sail through the canal, with a maximum total of 80 vessels a day. Yearly traffic numbers about 20,000 ships carrying between 300 million and 400 million net tons. Tankers and cargo ships account for nearly all canal traffic, but occasionally passenger liners and warships use the waterway. Northbound cargo is chiefly oil from the Persian Gulf headed for Western Europe. Southbound cargo consists mainly of manufactured goods and grain from Europe and North America destined for the Far East and southern Asia.People dreamt of a canal like Suez Canal now ________.

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 592 lượt xem 6 năm trước

KỲ THI THỬ THPT QUỐC GIA NĂM 2019 MÔN TIẾNG ANH(P1)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 53 to 62.History books recorded that the first film with sound was The Jazz Singer in 1927. But sound films, or talkies, did not suddenly appear after years of silent screenings. From the earliest public performances in 1896, films were accompanied by music and sound effects. These were produced by a single pianist, a small band, or a full-scale orchestra; large movie theatres could buy sound-effect machines. Research into sound that was reproduced at exactly at the same time as the pictures – called “synchronized sound” – began soon after the very first films were shown. With synchronized sound, characters on the movie screen could sing and speak. As early as 1896, the newly invented gramophone, which played a large disc carrying music and dialogue, was used as a sound system. The biggest disadvantage was that the sound and pictures could become unsynchronized if, for example, the gramophone needle jumped or if the speed of the projector changed. This system was only effective for a single song or dialogue sequence.In the “sound-on-film” system, sound was recorded as a series of marks on celluloid which could be read by an optical sensor. These signals would be placed on the film alongside the image, guaranteeing synchronization. Short feature films were produced in this way as early as 1922. This system eventually brought us “talking pictures”.The passage is mainly about the _________.

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 433 lượt xem 6 năm trước

Bài tập thủy phân một este đơn chức

Thủy phân hoàn toàn 10,75 gam một este X trong NaOH dư, thu được 11,75 gam muối. Mặt khác, cũng 10,75 gam X có thể làm mất màu vừa hết 100 gam dung dịch Br2 20%. Biết rằng trong phân tử X có chứa 2 liên kết . Tên gọi của X là

Hóa học Tốt nghiệp THPT

Xem chi tiết 7.4 K lượt xem 6 năm trước

20 BỘ ĐỀ THI THỬ THPT QUỐC GIA LẦN 1 NĂM HỌC 2018 - 2019 MÔN: TIẾNG ANH(ĐỀ 11)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50. An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely. Air pollution requires a very flexible definition that permits continuous changes. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled - a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions. Many of more important air pollutants, such as sulfur oxides, carbon monoxides and nitrogen oxides are found in nature. As the Earth developed, the concentration of these pollutants was altered by various chemical reactions; they became components in biogeochemical cycles. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil. On a global basis, nature's output of these compounds dwarfs that resulting from human activities. However, human production usually occurs in a localized area, such as a city. In such a region, human output may be dominant and may temporarily overload the natural purification scheme of the cycles. The result is an concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact, the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0. 08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however has a natural level of 0. 1 ppm and is not usually a pollutant until its level reaches about 15 ppm.It can be inferred from the first paragraph that ______.

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 505 lượt xem 6 năm trước

Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P1)

Read the following passage and mark the letter A, B, C or D to indicate the correct answer.The medieval artists didn’t know about perspective; they didn’t want to make their people look like real, individual people in a real, individual scene. They wanted to show the truth, the eternal quality of their religious stories. So these artists didn’t need to know about perspective.In the European Renaissance period, artists wanted to show the importance of the individual person and his or her possessions and surroundings. A flat medieval style couldn’t show this level of reality and the artists needed a new technique. It was the Italian artist Brunelleschi who discovered the technique of perspective drawing. At first the artists of the Renaissance only had single-point perspective. Later they realized that they could have two-pointed perspective and still later multi-point perspective.With two-point perspective they could turn an object (like a building) at an angle to the picture and draw two sides of it. The technique of perspective which seems so natural to us now is an invented technique, a part of the “grammar of painting”. Like all bits of grammar there are exceptions about perspective. For example, only vertical and horizontal surfaces seem to meet on eye level. Sloping roof tops don’t meet on eye level.For 500 years, artists in Europe made use of perspective drawing in their pictures. Nevertheless, there are a range of priorities that artists give in displaying individual styles. Crivelli wanted to show depth in his picture and he used a simple single-point perspective. Cezanne always talked about space and volume. Van Gogh, like some of the other painters of the Impressionist period, was interested in Japanese prints. And Japanese artists until this century were always very strong designers of “flat” pictures. Picasso certainly made pictures which have volume and depth. However, he wanted to keep our eyes on the surface and to remind us that his paintings are paintings and not illusions.It is technically easy to give an illusion of depth. However, a strong two dimensional design is just as important as a feeling of depth, and perhaps more important. The word “he” in line 25 refers to

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 587 lượt xem 6 năm trước

Tổng hợp đề thi Tiếng Anh có lời giải (Đề số 11)

Your parents must be proud of your result at school!

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 1.6 K lượt xem 6 năm trước

20 BỘ ĐỀ THI THỬ THPT QUỐC GIA LẦN 1 NĂM HỌC 2018 - 2019 MÔN: TIẾNG ANH(ĐỀ 11)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50. An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely. Air pollution requires a very flexible definition that permits continuous changes. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled - a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions. Many of more important air pollutants, such as sulfur oxides, carbon monoxides and nitrogen oxides are found in nature. As the Earth developed, the concentration of these pollutants was altered by various chemical reactions; they became components in biogeochemical cycles. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil. On a global basis, nature's output of these compounds dwarfs that resulting from human activities. However, human production usually occurs in a localized area, such as a city. In such a region, human output may be dominant and may temporarily overload the natural purification scheme of the cycles. The result is an concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact, the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0. 08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however has a natural level of 0. 1 ppm and is not usually a pollutant until its level reaches about 15 ppm.The word “adversely” in the first paragraph is closest in meaning to ______.

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 565 lượt xem 6 năm trước

KỲ THI THỬ THPT QUỐC GIA NĂM 2019 MÔN TIẾNG ANH(P1)

Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 399 lượt xem 6 năm trước

Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P1)

Read the following passage and mark the letter A, B, C or D to indicate the correct answer.The medieval artists didn’t know about perspective; they didn’t want to make their people look like real, individual people in a real, individual scene. They wanted to show the truth, the eternal quality of their religious stories. So these artists didn’t need to know about perspective.In the European Renaissance period, artists wanted to show the importance of the individual person and his or her possessions and surroundings. A flat medieval style couldn’t show this level of reality and the artists needed a new technique. It was the Italian artist Brunelleschi who discovered the technique of perspective drawing. At first the artists of the Renaissance only had single-point perspective. Later they realized that they could have two-pointed perspective and still later multi-point perspective.With two-point perspective they could turn an object (like a building) at an angle to the picture and draw two sides of it. The technique of perspective which seems so natural to us now is an invented technique, a part of the “grammar of painting”. Like all bits of grammar there are exceptions about perspective. For example, only vertical and horizontal surfaces seem to meet on eye level. Sloping roof tops don’t meet on eye level.For 500 years, artists in Europe made use of perspective drawing in their pictures. Nevertheless, there are a range of priorities that artists give in displaying individual styles. Crivelli wanted to show depth in his picture and he used a simple single-point perspective. Cezanne always talked about space and volume. Van Gogh, like some of the other painters of the Impressionist period, was interested in Japanese prints. And Japanese artists until this century were always very strong designers of “flat” pictures. Picasso certainly made pictures which have volume and depth. However, he wanted to keep our eyes on the surface and to remind us that his paintings are paintings and not illusions.It is technically easy to give an illusion of depth. However, a strong two dimensional design is just as important as a feeling of depth, and perhaps more important. The author’s purpose to give the example in line15-17 is to

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 854 lượt xem 6 năm trước

Đề thi thử THPT Quốc Gia môn Tiếng anh năm 2020 (Đề số 7)

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questionsThe victims on the flight MH370 were thought to be in desperate hours before the airplane might have disappeared into nowhere

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 1 K lượt xem 6 năm trước

20 BỘ ĐỀ THI THỬ THPT QUỐC GIA LẦN 1 NĂM HỌC 2018 - 2019 MÔN: TIẾNG ANH(ĐỀ 11)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50. An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely. Air pollution requires a very flexible definition that permits continuous changes. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled - a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions. Many of more important air pollutants, such as sulfur oxides, carbon monoxides and nitrogen oxides are found in nature. As the Earth developed, the concentration of these pollutants was altered by various chemical reactions; they became components in biogeochemical cycles. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil. On a global basis, nature's output of these compounds dwarfs that resulting from human activities. However, human production usually occurs in a localized area, such as a city. In such a region, human output may be dominant and may temporarily overload the natural purification scheme of the cycles. The result is an concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact, the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0. 08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however has a natural level of 0. 1 ppm and is not usually a pollutant until its level reaches about 15 ppm.What does the passage mainly dicuss?

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 336 lượt xem 6 năm trước

Bài tập thủy phân một este đơn chức

Thủy phân hoàn toàn 0,04 mol este đơn chức X trong 112 gam dung dịch KOH 8% (dùng gấp đôi lượng phản ứng), thu được dung dịch Y. Cô cạn Y, thu được tổng khối lượng các sản phẩm hữu cơ là 9,2 gam. Số đồng phân cấu tạo của X thoả mãn là

Hóa học Tốt nghiệp THPT

Xem chi tiết 6.1 K lượt xem 6 năm trước

20 BỘ ĐỀ THI THỬ THPT QUỐC GIA LẦN 1 NĂM HỌC 2018 - 2019 MÔN: TIẾNG ANH(ĐỀ 11)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42. Although speech is the most advanced form of communication, there are many ways of communicating without using speech. Signals, signs, symbols and gestures may be found in every known culture. The basic function of a signal is to impinge upon the environment in such a way that it attracts attention, as, for example, the dots and dashes of telegraph circuit. Coded to refer to speech, the potential for communication is very great. Less adaptable to the codification of words, signs also contain meaning in and of themselves. A stop sign or a barber pole conveys meaning quickly and conveniently. Symbols are more difficult to describe than either signals or signs because of their intricate relationship with the receiver's cultural perceptions. In some cultures, applauding in a theater provides performers with an auditory symbol of approval. Gestures such as waving and handshaking also communicate certain cultural messages. Although signals, signs, symbols and gestures are very useful, they do have a major disadvantage. They usually do not allow ideas to be shared without the sender being directly adjacent to the receiver. Without an exchange of ideas, interaction come to a halt. As a result, means of communication intended to be used for long distances and extended periods must be based upon speech. To radio, television and the telephone, one must add fax, paging systems, electronic mail, and the Internet, and no doubts but that there are more means of communication on the horizon.It may be concluded from this passage that _______.

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 3.1 K lượt xem 6 năm trước

KỲ THI THỬ THPT QUỐC GIA NĂM 2019 MÔN TIẾNG ANH(P1)

Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 594 lượt xem 6 năm trước

Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P1)

Read the following passage and mark the letter A, B, C or D to indicate the correct answer.The medieval artists didn’t know about perspective; they didn’t want to make their people look like real, individual people in a real, individual scene. They wanted to show the truth, the eternal quality of their religious stories. So these artists didn’t need to know about perspective.In the European Renaissance period, artists wanted to show the importance of the individual person and his or her possessions and surroundings. A flat medieval style couldn’t show this level of reality and the artists needed a new technique. It was the Italian artist Brunelleschi who discovered the technique of perspective drawing. At first the artists of the Renaissance only had single-point perspective. Later they realized that they could have two-pointed perspective and still later multi-point perspective.With two-point perspective they could turn an object (like a building) at an angle to the picture and draw two sides of it. The technique of perspective which seems so natural to us now is an invented technique, a part of the “grammar of painting”. Like all bits of grammar there are exceptions about perspective. For example, only vertical and horizontal surfaces seem to meet on eye level. Sloping roof tops don’t meet on eye level.For 500 years, artists in Europe made use of perspective drawing in their pictures. Nevertheless, there are a range of priorities that artists give in displaying individual styles. Crivelli wanted to show depth in his picture and he used a simple single-point perspective. Cezanne always talked about space and volume. Van Gogh, like some of the other painters of the Impressionist period, was interested in Japanese prints. And Japanese artists until this century were always very strong designers of “flat” pictures. Picasso certainly made pictures which have volume and depth. However, he wanted to keep our eyes on the surface and to remind us that his paintings are paintings and not illusions.It is technically easy to give an illusion of depth. However, a strong two dimensional design is just as important as a feeling of depth, and perhaps more important. The word “Grammar ” in line 14 is closest in meaning to

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 484 lượt xem 6 năm trước

Đề thi thử THPT Quốc Gia môn Tiếng anh năm 2020 (Đề số 7)

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questionsAmericans like to be simple in how they wear, so American students choose to wear casual clothes when they go to school

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 1.1 K lượt xem 6 năm trước

Tổng hợp đề thi Tiếng Anh có lời giải (Đề số 11)

Can you ……………. your papers with you when you come to see me. Please?

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 15.7 K lượt xem 6 năm trước

TÍNH CHẤT HÓA HỌC CỦA KIM LOẠI

Cho phản ứng hóa học: 4Cr + 3O2 →to2Cr2O3. Trong phản ứng trên xảy ra

Hóa học Lớp 12

Xem chi tiết 597 lượt xem 6 năm trước

20 BỘ ĐỀ THI THỬ THPT QUỐC GIA LẦN 1 NĂM HỌC 2018 - 2019 MÔN: TIẾNG ANH(ĐỀ 11)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42. Although speech is the most advanced form of communication, there are many ways of communicating without using speech. Signals, signs, symbols and gestures may be found in every known culture. The basic function of a signal is to impinge upon the environment in such a way that it attracts attention, as, for example, the dots and dashes of telegraph circuit. Coded to refer to speech, the potential for communication is very great. Less adaptable to the codification of words, signs also contain meaning in and of themselves. A stop sign or a barber pole conveys meaning quickly and conveniently. Symbols are more difficult to describe than either signals or signs because of their intricate relationship with the receiver's cultural perceptions. In some cultures, applauding in a theater provides performers with an auditory symbol of approval. Gestures such as waving and handshaking also communicate certain cultural messages. Although signals, signs, symbols and gestures are very useful, they do have a major disadvantage. They usually do not allow ideas to be shared without the sender being directly adjacent to the receiver. Without an exchange of ideas, interaction come to a halt. As a result, means of communication intended to be used for long distances and extended periods must be based upon speech. To radio, television and the telephone, one must add fax, paging systems, electronic mail, and the Internet, and no doubts but that there are more means of communication on the horizon.Why were the telephone, radio, and television invented?

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 466 lượt xem 6 năm trước

Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P1)

Read the following passage and mark the letter A, B, C or D to indicate the correct answer.The medieval artists didn’t know about perspective; they didn’t want to make their people look like real, individual people in a real, individual scene. They wanted to show the truth, the eternal quality of their religious stories. So these artists didn’t need to know about perspective.In the European Renaissance period, artists wanted to show the importance of the individual person and his or her possessions and surroundings. A flat medieval style couldn’t show this level of reality and the artists needed a new technique. It was the Italian artist Brunelleschi who discovered the technique of perspective drawing. At first the artists of the Renaissance only had single-point perspective. Later they realized that they could have two-pointed perspective and still later multi-point perspective.With two-point perspective they could turn an object (like a building) at an angle to the picture and draw two sides of it. The technique of perspective which seems so natural to us now is an invented technique, a part of the “grammar of painting”. Like all bits of grammar there are exceptions about perspective. For example, only vertical and horizontal surfaces seem to meet on eye level. Sloping roof tops don’t meet on eye level.For 500 years, artists in Europe made use of perspective drawing in their pictures. Nevertheless, there are a range of priorities that artists give in displaying individual styles. Crivelli wanted to show depth in his picture and he used a simple single-point perspective. Cezanne always talked about space and volume. Van Gogh, like some of the other painters of the Impressionist period, was interested in Japanese prints. And Japanese artists until this century were always very strong designers of “flat” pictures. Picasso certainly made pictures which have volume and depth. However, he wanted to keep our eyes on the surface and to remind us that his paintings are paintings and not illusions.It is technically easy to give an illusion of depth. However, a strong two dimensional design is just as important as a feeling of depth, and perhaps more important. The word “it” in line 13 refers to

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 403 lượt xem 6 năm trước

KỲ THI THỬ THPT QUỐC GIA NĂM 2019 MÔN TIẾNG ANH(P1)

Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 835 lượt xem 6 năm trước

Tổng hợp đề thi Tiếng Anh có lời giải (Đề số 11)

Would you like to go to the movies tomorrow? – Sure. By then I ……………. my exam

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 12.7 K lượt xem 6 năm trước

Đề thi thử THPT Quốc Gia môn Tiếng anh năm 2020 (Đề số 7)

Mark the letter A, B,C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questionsBelow (A) are some advices (B) that can help interviewees (C) reduce the feeling of pressure and create (D) a good impression on your interviewer

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 2.6 K lượt xem 6 năm trước

20 BỘ ĐỀ THI THỬ THPT QUỐC GIA LẦN 1 NĂM HỌC 2018 - 2019 MÔN: TIẾNG ANH(ĐỀ 11)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42. Although speech is the most advanced form of communication, there are many ways of communicating without using speech. Signals, signs, symbols and gestures may be found in every known culture. The basic function of a signal is to impinge upon the environment in such a way that it attracts attention, as, for example, the dots and dashes of telegraph circuit. Coded to refer to speech, the potential for communication is very great. Less adaptable to the codification of words, signs also contain meaning in and of themselves. A stop sign or a barber pole conveys meaning quickly and conveniently. Symbols are more difficult to describe than either signals or signs because of their intricate relationship with the receiver's cultural perceptions. In some cultures, applauding in a theater provides performers with an auditory symbol of approval. Gestures such as waving and handshaking also communicate certain cultural messages. Although signals, signs, symbols and gestures are very useful, they do have a major disadvantage. They usually do not allow ideas to be shared without the sender being directly adjacent to the receiver. Without an exchange of ideas, interaction come to a halt. As a result, means of communication intended to be used for long distances and extended periods must be based upon speech. To radio, television and the telephone, one must add fax, paging systems, electronic mail, and the Internet, and no doubts but that there are more means of communication on the horizon.Applauding was cited as an example of _______.

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 319 lượt xem 6 năm trước

Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P1)

Read the following passage and mark the letter A, B, C or D to indicate the correct answer.The medieval artists didn’t know about perspective; they didn’t want to make their people look like real, individual people in a real, individual scene. They wanted to show the truth, the eternal quality of their religious stories. So these artists didn’t need to know about perspective.In the European Renaissance period, artists wanted to show the importance of the individual person and his or her possessions and surroundings. A flat medieval style couldn’t show this level of reality and the artists needed a new technique. It was the Italian artist Brunelleschi who discovered the technique of perspective drawing. At first the artists of the Renaissance only had single-point perspective. Later they realized that they could have two-pointed perspective and still later multi-point perspective.With two-point perspective they could turn an object (like a building) at an angle to the picture and draw two sides of it. The technique of perspective which seems so natural to us now is an invented technique, a part of the “grammar of painting”. Like all bits of grammar there are exceptions about perspective. For example, only vertical and horizontal surfaces seem to meet on eye level. Sloping roof tops don’t meet on eye level.For 500 years, artists in Europe made use of perspective drawing in their pictures. Nevertheless, there are a range of priorities that artists give in displaying individual styles. Crivelli wanted to show depth in his picture and he used a simple single-point perspective. Cezanne always talked about space and volume. Van Gogh, like some of the other painters of the Impressionist period, was interested in Japanese prints. And Japanese artists until this century were always very strong designers of “flat” pictures. Picasso certainly made pictures which have volume and depth. However, he wanted to keep our eyes on the surface and to remind us that his paintings are paintings and not illusions.It is technically easy to give an illusion of depth. However, a strong two dimensional design is just as important as a feeling of depth, and perhaps more important. The discovery of perspective was the result of

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 1.7 K lượt xem 6 năm trước

20 BỘ ĐỀ THI THỬ THPT QUỐC GIA LẦN 1 NĂM HỌC 2018 - 2019 MÔN: TIẾNG ANH(ĐỀ 11)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42. Although speech is the most advanced form of communication, there are many ways of communicating without using speech. Signals, signs, symbols and gestures may be found in every known culture. The basic function of a signal is to impinge upon the environment in such a way that it attracts attention, as, for example, the dots and dashes of telegraph circuit. Coded to refer to speech, the potential for communication is very great. Less adaptable to the codification of words, signs also contain meaning in and of themselves. A stop sign or a barber pole conveys meaning quickly and conveniently. Symbols are more difficult to describe than either signals or signs because of their intricate relationship with the receiver's cultural perceptions. In some cultures, applauding in a theater provides performers with an auditory symbol of approval. Gestures such as waving and handshaking also communicate certain cultural messages. Although signals, signs, symbols and gestures are very useful, they do have a major disadvantage. They usually do not allow ideas to be shared without the sender being directly adjacent to the receiver. Without an exchange of ideas, interaction come to a halt. As a result, means of communication intended to be used for long distances and extended periods must be based upon speech. To radio, television and the telephone, one must add fax, paging systems, electronic mail, and the Internet, and no doubts but that there are more means of communication on the horizon.The word “it” in paragraph refers to _______.

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 380 lượt xem 6 năm trước

Đề thi thử THPT Quốc Gia môn Tiếng anh năm 2020 (Đề số 7)

Mark the letter A, B,C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questionsThe life span (A) of a domestic cat at home is said to be (B) far shorter (C) than a wild tiger (D) in the jungle

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 5.9 K lượt xem 6 năm trước

Bài tập thủy phân một este đơn chức

Hóa hơi hoàn toàn 23,6 gam một este X mạch hở, thu được thể tích hơi bằng thể tích của 6,4 gam khí oxi (đo ở cùng điều kiện). Mặt khác, thủy phân hoàn toàn 11,8 gam X bằng dung dịch NaOH dư, thu được 13,6 gam một muối hữu cơ và m gam một ancol. Giá trị của m là

Hóa học Tốt nghiệp THPT

Xem chi tiết 4.9 K lượt xem 6 năm trước

Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P1)

Read the following passage and mark the letter A, B, C or D to indicate the correct answer.The medieval artists didn’t know about perspective; they didn’t want to make their people look like real, individual people in a real, individual scene. They wanted to show the truth, the eternal quality of their religious stories. So these artists didn’t need to know about perspective.In the European Renaissance period, artists wanted to show the importance of the individual person and his or her possessions and surroundings. A flat medieval style couldn’t show this level of reality and the artists needed a new technique. It was the Italian artist Brunelleschi who discovered the technique of perspective drawing. At first the artists of the Renaissance only had single-point perspective. Later they realized that they could have two-pointed perspective and still later multi-point perspective.With two-point perspective they could turn an object (like a building) at an angle to the picture and draw two sides of it. The technique of perspective which seems so natural to us now is an invented technique, a part of the “grammar of painting”. Like all bits of grammar there are exceptions about perspective. For example, only vertical and horizontal surfaces seem to meet on eye level. Sloping roof tops don’t meet on eye level.For 500 years, artists in Europe made use of perspective drawing in their pictures. Nevertheless, there are a range of priorities that artists give in displaying individual styles. Crivelli wanted to show depth in his picture and he used a simple single-point perspective. Cezanne always talked about space and volume. Van Gogh, like some of the other painters of the Impressionist period, was interested in Japanese prints. And Japanese artists until this century were always very strong designers of “flat” pictures. Picasso certainly made pictures which have volume and depth. However, he wanted to keep our eyes on the surface and to remind us that his paintings are paintings and not illusions.It is technically easy to give an illusion of depth. However, a strong two dimensional design is just as important as a feeling of depth, and perhaps more important. According to the passage, which is the main concern for medieval artists?

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 710 lượt xem 6 năm trước

20 BỘ ĐỀ THI THỬ THPT QUỐC GIA LẦN 1 NĂM HỌC 2018 - 2019 MÔN: TIẾNG ANH(ĐỀ 11)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42. Although speech is the most advanced form of communication, there are many ways of communicating without using speech. Signals, signs, symbols and gestures may be found in every known culture. The basic function of a signal is to impinge upon the environment in such a way that it attracts attention, as, for example, the dots and dashes of telegraph circuit. Coded to refer to speech, the potential for communication is very great. Less adaptable to the codification of words, signs also contain meaning in and of themselves. A stop sign or a barber pole conveys meaning quickly and conveniently. Symbols are more difficult to describe than either signals or signs because of their intricate relationship with the receiver's cultural perceptions. In some cultures, applauding in a theater provides performers with an auditory symbol of approval. Gestures such as waving and handshaking also communicate certain cultural messages. Although signals, signs, symbols and gestures are very useful, they do have a major disadvantage. They usually do not allow ideas to be shared without the sender being directly adjacent to the receiver. Without an exchange of ideas, interaction come to a halt. As a result, means of communication intended to be used for long distances and extended periods must be based upon speech. To radio, television and the telephone, one must add fax, paging systems, electronic mail, and the Internet, and no doubts but that there are more means of communication on the horizon.The phrase “impinge upon” in paragraph 1 is closest in meaning to _______.

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 518 lượt xem 6 năm trước

Đề thi thử THPT Quốc Gia môn Tiếng anh năm 2020 (Đề số 7)

Mark the letter A, B,C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questionsOur ideal world would be (A) a peaceful one where there are no peace (B) or conflicts between nations, and where (C) people won’t have to live under the threat of (D) terrorism but all live together in harmony.

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 4.7 K lượt xem 6 năm trước

Bộ đề luyện thi Hóa Học cực hay có lời giải chi tiết (Đề số 9)

Tráng bạc hoàn toàn m gam glucozơ thu được 43,2 gam Ag. Nếu lên men rượu hoàn toàn m gam glucozơ rồi cho toàn bộ khí CO2 tạo thành vào nước vôi trong dư thì lượng kết tủa thu được là

Hóa học Tốt nghiệp THPT

Xem chi tiết 428 lượt xem 6 năm trước

Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P1)

Read the following passage and mark the letter A, B, C or D to indicate the correct answer.The medieval artists didn’t know about perspective; they didn’t want to make their people look like real, individual people in a real, individual scene. They wanted to show the truth, the eternal quality of their religious stories. So these artists didn’t need to know about perspective.In the European Renaissance period, artists wanted to show the importance of the individual person and his or her possessions and surroundings. A flat medieval style couldn’t show this level of reality and the artists needed a new technique. It was the Italian artist Brunelleschi who discovered the technique of perspective drawing. At first the artists of the Renaissance only had single-point perspective. Later they realized that they could have two-pointed perspective and still later multi-point perspective.With two-point perspective they could turn an object (like a building) at an angle to the picture and draw two sides of it. The technique of perspective which seems so natural to us now is an invented technique, a part of the “grammar of painting”. Like all bits of grammar there are exceptions about perspective. For example, only vertical and horizontal surfaces seem to meet on eye level. Sloping roof tops don’t meet on eye level.For 500 years, artists in Europe made use of perspective drawing in their pictures. Nevertheless, there are a range of priorities that artists give in displaying individual styles. Crivelli wanted to show depth in his picture and he used a simple single-point perspective. Cezanne always talked about space and volume. Van Gogh, like some of the other painters of the Impressionist period, was interested in Japanese prints. And Japanese artists until this century were always very strong designers of “flat” pictures. Picasso certainly made pictures which have volume and depth. However, he wanted to keep our eyes on the surface and to remind us that his paintings are paintings and not illusions.It is technically easy to give an illusion of depth. However, a strong two dimensional design is just as important as a feeling of depth, and perhaps more important. The word “eternal” in line 3 is closest in meaning to

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 543 lượt xem 6 năm trước

20 BỘ ĐỀ THI THỬ THPT QUỐC GIA LẦN 1 NĂM HỌC 2018 - 2019 MÔN: TIẾNG ANH(ĐỀ 11)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42. Although speech is the most advanced form of communication, there are many ways of communicating without using speech. Signals, signs, symbols and gestures may be found in every known culture. The basic function of a signal is to impinge upon the environment in such a way that it attracts attention, as, for example, the dots and dashes of telegraph circuit. Coded to refer to speech, the potential for communication is very great. Less adaptable to the codification of words, signs also contain meaning in and of themselves. A stop sign or a barber pole conveys meaning quickly and conveniently. Symbols are more difficult to describe than either signals or signs because of their intricate relationship with the receiver's cultural perceptions. In some cultures, applauding in a theater provides performers with an auditory symbol of approval. Gestures such as waving and handshaking also communicate certain cultural messages. Although signals, signs, symbols and gestures are very useful, they do have a major disadvantage. They usually do not allow ideas to be shared without the sender being directly adjacent to the receiver. Without an exchange of ideas, interaction come to a halt. As a result, means of communication intended to be used for long distances and extended periods must be based upon speech. To radio, television and the telephone, one must add fax, paging systems, electronic mail, and the Internet, and no doubts but that there are more means of communication on the horizon.What does the author say about speech?

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 607 lượt xem 6 năm trước

Đề thi thử THPT Quốc Gia môn Tiếng anh năm 2020 (Đề số 7)

Mark the letter A, B,C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questionsAll of the (A) principles that are collected (B) here serve to make up a system of (C) checking and evaluating security issues. (D)

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 1.4 K lượt xem 6 năm trước

20 BỘ ĐỀ THI THỬ THPT QUỐC GIA LẦN 1 NĂM HỌC 2018 - 2019 MÔN: TIẾNG ANH(ĐỀ 11)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42. Although speech is the most advanced form of communication, there are many ways of communicating without using speech. Signals, signs, symbols and gestures may be found in every known culture. The basic function of a signal is to impinge upon the environment in such a way that it attracts attention, as, for example, the dots and dashes of telegraph circuit. Coded to refer to speech, the potential for communication is very great. Less adaptable to the codification of words, signs also contain meaning in and of themselves. A stop sign or a barber pole conveys meaning quickly and conveniently. Symbols are more difficult to describe than either signals or signs because of their intricate relationship with the receiver's cultural perceptions. In some cultures, applauding in a theater provides performers with an auditory symbol of approval. Gestures such as waving and handshaking also communicate certain cultural messages. Although signals, signs, symbols and gestures are very useful, they do have a major disadvantage. They usually do not allow ideas to be shared without the sender being directly adjacent to the receiver. Without an exchange of ideas, interaction come to a halt. As a result, means of communication intended to be used for long distances and extended periods must be based upon speech. To radio, television and the telephone, one must add fax, paging systems, electronic mail, and the Internet, and no doubts but that there are more means of communication on the horizon.Which of the following would be the best title for the passage?

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 9.4 K lượt xem 6 năm trước

Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P1)

Read the following passage and mark the letter A, B, C or D to indicate the correct answer.The medieval artists didn’t know about perspective; they didn’t want to make their people look like real, individual people in a real, individual scene. They wanted to show the truth, the eternal quality of their religious stories. So these artists didn’t need to know about perspective.In the European Renaissance period, artists wanted to show the importance of the individual person and his or her possessions and surroundings. A flat medieval style couldn’t show this level of reality and the artists needed a new technique. It was the Italian artist Brunelleschi who discovered the technique of perspective drawing. At first the artists of the Renaissance only had single-point perspective. Later they realized that they could have two-pointed perspective and still later multi-point perspective.With two-point perspective they could turn an object (like a building) at an angle to the picture and draw two sides of it. The technique of perspective which seems so natural to us now is an invented technique, a part of the “grammar of painting”. Like all bits of grammar there are exceptions about perspective. For example, only vertical and horizontal surfaces seem to meet on eye level. Sloping roof tops don’t meet on eye level.For 500 years, artists in Europe made use of perspective drawing in their pictures. Nevertheless, there are a range of priorities that artists give in displaying individual styles. Crivelli wanted to show depth in his picture and he used a simple single-point perspective. Cezanne always talked about space and volume. Van Gogh, like some of the other painters of the Impressionist period, was interested in Japanese prints. And Japanese artists until this century were always very strong designers of “flat” pictures. Picasso certainly made pictures which have volume and depth. However, he wanted to keep our eyes on the surface and to remind us that his paintings are paintings and not illusions.It is technically easy to give an illusion of depth. However, a strong two dimensional design is just as important as a feeling of depth, and perhaps more important. The passage mainly discusses

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 798 lượt xem 6 năm trước

20 BỘ ĐỀ THI THỬ THPT QUỐC GIA LẦN 1 NĂM HỌC 2018 - 2019 MÔN: TIẾNG ANH(ĐỀ 11)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks from 31 to 35. Fill in the appropriate word in question 35 In Japan, politeness and good manners are very important and business meetings are very formal. Business cards are also important and they (31) ______ these at the beginning of a meeting. They always look at them carefully, so you should do the same as they might think you're rude if you don't. A lot of communication is non-verbal. They are very good listeners and may ask a lot of questions to (32)_ they understand everything. In a conversation they wait longer before they reply than westerners do, so it's important (33)_ speak in those long pauses but to wait for their reply. In their culture it's rude to ask direct questions or to say 'No' or 'I disagree'. In business it takes a long time to (34)_ a decision because they have to ask everyone in the company. When they say 'Yes' it may mean 'I understand', not 'I agree', and when they smile it might be because they don't know (35)_____ to say.

Tiếng Anh Tốt nghiệp THPT

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Bài tập thủy phân một este đơn chức

Thủy phân hoàn toàn 0,2 mol một este thì cần vừa đúng 80 gam dung dịch NaOH 30% sau phản ứng thu được 54,8 gam muối của hai axit cacboxilic đơn chức. Hai axit đó là:

Hóa học Tốt nghiệp THPT

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KỲ THI THỬ THPT QUỐC GIA NĂM 2019 MÔN TIẾNG ANH(P1)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 40 to 49.On 26th May 1828, the people of Nuremberg in Germany found a teenage boy who waswandering alone through the streets. When they came across him, he had no possessions except for two old letters. Because of his behavior and appearance, they took him to the police station. Kaspar spent the next two months in prison, where he hardly spoke and refused all food except for bread and water. Some people assumed that Kaspar had grown up alone in the forest, like a wild animal. But gradually, a different picture emerged.Kaspar said he had spent his whole childhood in a small dark cell. He had never seen the world outside or left his cell. He had never met or spoken to another human being. The cell was empty apart from a small bed and one toy-a wooden horse. He claimed that he had found bread and water in his cell every morning. According to Kaspar’s account, a mysterious man had begun to call on him shortly before his release. The man never showed his face.Kaspar became well-known throughout Germany and in other countries too, and people found his ascinating. Some suggested that Kaspar was the son of a rich and powerful man-a prince perhaps-who wanted to keep his identity secret. A schoolteacher called Friedrich Daumer met Kaspar and agreed to look after him. Daumer taught him various subjects and encouraged Kaspar’s talent for drawing.One day in 1829, Kaspar was found with a knife wound to his head. He claimed that a man with a hood over his face had attacked him-the same man who had brought him to Nuremberg. It wasn’t a serious injury, and Kaspar got over it. But in 1833, Hauser came home with a deep knife wound in his chest, saying someone had attacked him in a garden. Three days later, Kaspar died from the wound. Just before he died, Kaspar told the police that his attacker had given him a bag, so the police went to the garden and looked for it. They found it, with a note inside. The note was in mirror writing and said in German: “I want to tell you about myself. I come from the Bavarian border, on the river.”Over the years, books have been written about Kaspar’s stories and various historians have looked into them. Most have concluded that the stories were untrue and that Kaspar Hauser was a liar who killed himself (possibly by mistake). But for some people, Kaspar Hauser’s life and death remain one of the most mysterious stories in history.Most historians today believed that Kaspar Hauser .

Tiếng Anh Tốt nghiệp THPT

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Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P1)

Read the following passage and mark the letter A, B, C or D to choose the word or phrase that best fits each of the numbered blank.Education is more important today than ever before. It helps people acquire the skills they need for such everyday ----------(35) as reading a newspaper or managing their money. It also gives them specialized training they may need to ----------(36) for a job or career. For example, a person must meet certain educational requirements and obtain a ----------(37) or certificate before he can practice law or medicine. Many fields, such as computer operation ----------(38)police work, require satisfactory completion of special training courses.Education is also important ----------(39) it helps people get more out of life. It increases their knowledge and understanding of the world. It helps them ----------(40)the skill that makes life more interesting and enjoyable, such as the skills ----------(41) to participate in a sport, paint a picture or play a musical instrument. Such education becomes ----------(42)important as people gain more and more leisure time.Education also helps people adjust to change. This habit has become ----------(43) because social changes today take place with increasing speed and affect the lives of more and more people. Education can help a person understand these changes and provide him ----------(44)the skills for adjusting to them.Điền vào ô 44

Tiếng Anh Tốt nghiệp THPT

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20 BỘ ĐỀ THI THỬ THPT QUỐC GIA LẦN 1 NĂM HỌC 2018 - 2019 MÔN: TIẾNG ANH(ĐỀ 11)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks from 31 to 35. Fill in the appropriate word in question 34 In Japan, politeness and good manners are very important and business meetings are very formal. Business cards are also important and they (31) ______ these at the beginning of a meeting. They always look at them carefully, so you should do the same as they might think you're rude if you don't. A lot of communication is non-verbal. They are very good listeners and may ask a lot of questions to (32)_ they understand everything. In a conversation they wait longer before they reply than westerners do, so it's important (33)_ speak in those long pauses but to wait for their reply. In their culture it's rude to ask direct questions or to say 'No' or 'I disagree'. In business it takes a long time to (34)_ a decision because they have to ask everyone in the company. When they say 'Yes' it may mean 'I understand', not 'I agree', and when they smile it might be because they don't know (35)_____ to say.

Tiếng Anh Tốt nghiệp THPT

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Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P1)

Read the following passage and mark the letter A, B, C or D to choose the word or phrase that best fits each of the numbered blank.Education is more important today than ever before. It helps people acquire the skills they need for such everyday ----------(35) as reading a newspaper or managing their money. It also gives them specialized training they may need to ----------(36) for a job or career. For example, a person must meet certain educational requirements and obtain a ----------(37) or certificate before he can practice law or medicine. Many fields, such as computer operation ----------(38)police work, require satisfactory completion of special training courses.Education is also important ----------(39) it helps people get more out of life. It increases their knowledge and understanding of the world. It helps them ----------(40)the skill that makes life more interesting and enjoyable, such as the skills ----------(41) to participate in a sport, paint a picture or play a musical instrument. Such education becomes ----------(42)important as people gain more and more leisure time.Education also helps people adjust to change. This habit has become ----------(43) because social changes today take place with increasing speed and affect the lives of more and more people. Education can help a person understand these changes and provide him ----------(44)the skills for adjusting to them.Điền vào ô 43

Tiếng Anh Tốt nghiệp THPT

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Lớp 12

Lớp 11

Lớp 10

Ôn vào 10

Lớp 9

Lớp 8

Lớp 7

Lớp 6

Ôn vào 6

Lớp 5

Lớp 4

Lớp 3

Lớp 2

Lớp 1

Đại học

ĐGNL - ĐGTD

Tốt nghiệp THPT

Ôn vào 10

Ôn vào 6

V-ACT

HSA

TSA

SPT

Toán

Văn

Tiếng Anh

Vật lý

Hóa học

Sinh học

Lịch sử

Địa lý

Giáo dục Kinh tế và Pháp luật

Tin học

Công nghệ

Toán

Văn

Tiếng Anh

Lịch sử

Toán

Toán

Toán

Văn

Tiếng Anh

Vật lý

Hóa học

Sinh học

Khoa học tự nhiên

Tin học

Lịch sử

Địa lí

Toán

Toán

Toán

Văn

Tiếng Anh

Toán

Văn

Tiếng Anh

Khoa học tự nhiên

Lịch sử & Địa lí

Giáo dục công dân

Tin học

Tiếng Việt

Tiếng Anh

Danh sách câu hỏi ( Có 2,512,065 câu hỏi trên 50,242 trang )

Thủy phân hoàn toàn 10,75 gam một este X trong NaOH dư, thu được 11,75 gam muối. Mặt khác, cũng 10,75 gam X có thể làm mất màu vừa hết 100 gam dung dịch Br2 20%. Biết rằng trong phân tử X có chứa 2 liên kết . Tên gọi của X là

Your parents must be proud of your result at school!

Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questionsThe victims on the flight MH370 were thought to be in desperate hours before the airplane might have disappeared into nowhere

Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questionsAmericans like to be simple in how they wear, so American students choose to wear casual clothes when they go to school

Can you ……………. your papers with you when you come to see me. Please?

Cho phản ứng hóa học: 4Cr + 3O2 →to2Cr2O3. Trong phản ứng trên xảy ra

Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions

Would you like to go to the movies tomorrow? – Sure. By then I ……………. my exam

Mark the letter A, B,C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questionsBelow (A) are some advices (B) that can help interviewees (C) reduce the feeling of pressure and create (D) a good impression on your interviewer

Mark the letter A, B,C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questionsThe life span (A) of a domestic cat at home is said to be (B) far shorter (C) than a wild tiger (D) in the jungle

Tráng bạc hoàn toàn m gam glucozơ thu được 43,2 gam Ag. Nếu lên men rượu hoàn toàn m gam glucozơ rồi cho toàn bộ khí CO2 tạo thành vào nước vôi trong dư thì lượng kết tủa thu được là

Mark the letter A, B,C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questionsAll of the (A) principles that are collected (B) here serve to make up a system of (C) checking and evaluating security issues. (D)

Thủy phân hoàn toàn 0,2 mol một este thì cần vừa đúng 80 gam dung dịch NaOH 30% sau phản ứng thu được 54,8 gam muối của hai axit cacboxilic đơn chức. Hai axit đó là: