Danh sách câu hỏi ( Có 2,196,051 câu hỏi trên 43,922 trang )

tính chất vật lý, hóa học, ứng dụng, điều chế cacbohiđrat

X và Y là hai cacbohiđrat. X là chất rắn, tinh thể không màu, dễ tan trong nước, có vị ngọt nhưng không ngọt bằng đường mía. Y là chất rắn ở dạng sợi, màu trắng, không có mùi vị. Tên gọi của X, Y lần lượt là:

Hóa học Tốt nghiệp THPT
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Đề thi thử THPTQG năm 2019 chuẩn cấu trúc của bộ giáo dục có đáp án (Đề số 28)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the word or phrase that best fits each of the numbered blanks from 39 to 43 Someone once has said that there are three kinds of people who are interested in sport: People who (39)_______ part, people who watch, and people who watch (40)_______ television. It’s very easy to make fun of stay-at-home sports fans but on the other hand, television does enable us to enjoy all kinds of (41)_______ events. We can watch a racing car overtake another, see a cyclist cross the finishing line, or enjoy the goals of our favorite football (42)_______ The first time I watched a tennis match was on television, and I found it unexpectedly interesting. It’s not always easy to travel long distance to football grounds and television is a good solution. Of course, you can (43)_______ used to sitting indoors all the time, and this is dangerous. We should all try to keep fit, and have other interests and pastimes Điền vào ô số 40

Tiếng Anh Tốt nghiệp THPT
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Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 13)

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.         Any list of the greatest thinkers in history contains the name of the brilliant physicist Albert Einstein. His theories of relativity led to entirely new ways of thinking about time, space, matter, energy, and gravity. Einstein's work led to such scientific advances as the control of atomic energy, even television as a practical application of Einstein's work. In 1902 Einstein became an examiner in the Swiss patent office at Bern. In 1905, at age 26, he published the first of five major research papers.         The first one provided a theory explaining Brownian movement, the zig-zag motion of microscopic particles in suspension. The second paper laid the foundation for the photon, or quantum, theory of light. In it he proposed that light is composed of separate packets of energy, called quanta or photons, that have some of the properties of particles and some of the properties of waves. A third paper contained the "special theory of relativity" which showed that time and motion are relative to the observer, if the speed of light is constant and the natural laws are the same everywhere in the universe.         The fourth paper was a mathematical addition to the special theory of relativity. Here Einstein presented his famous formula, E = mc2, known as the energy mass equivalence. In 1916, Einstein published his general theory of relativity. In it he proposed that gravity is not a force, but a curve in the space-time continuum, created by the presence of mass. Einstein spoke out frequently against nationalism, the exalting of one nation above all others. He opposed war and violence and supported Zionism, the movement to establish a Jewish homeland in Palestine. When the Nazis came to power in 1933, they denounced his ideas.         He then moved to the United States. In 1939 Einstein learned that two German chemists had split the uranium atom. Einstein wrote to President Franklin D.Roosevelt warning him that this scientific knowledge could lead to Germany developing an atomic bomb. He suggested the United States begin its own atomic bomb research. Einstein's primary work was in the area of_________.

Tiếng Anh Tốt nghiệp THPT
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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 11)

We expect Linh _____ to the airport late as the plane will take off in 15 minutes.

Tiếng Anh Tốt nghiệp THPT
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Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 28)

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. Thanks to electricity, candles are no longer a necessity in our lives, but they are still a pleasure. The warm flame of candlelight can quickly alter the mood and atmosphere of a room, often creating a peaceful scene that electric light just cannot match. Candles are an important part of many cultural and religious festival and have been burnt in various forms for centuries. The ancient Romans and Egyptians made candles from a type of fiber coated with wax. However, up until the nineteenth century, most candles were made from a substance called tallow, obtained from beef fat. Tallow candles were very smoky and, understandably, had an unpleasant odor. In the 19th century, candle makers learned to separate stearin, the solid form fat used as a type of glue, from tallow and used it to harden other fats. Candles that contained stearin would burn longer than previous ones and had a better smell. Stearin is still one of the main components of modern candle-making, and the techniques used to create candles today are much the same as they have been for many years. These days, the increase range of wax dyes, perfumes and other additives that are now available make candle making a very exciting and rewarding hobby. Sales of candles have increased greatly over the last few years, showing that they have become part of our lives again, not through necessity, but because of the magical atmosphere they create. In our increasingly stressful lives, the calming quality of candlelight has a relaxing effect that many enjoy. For those would like to learn to make candles, finding and buying candle-making kits is easy. Candle-making is definitely enhanced by the exciting possibilities of experimentation with various materials. Be brave and try out different effects - some of the most wonderful creations can happen by accident. With a bit of practice, you will be amazed at the very professional finish that can be achieved. Despite their delicate beauty, candles can, of course, be highly dangerous. One should never leave lit candles unattended, even for a few moments. Always make sure candles are securely placed within candleholders. Teach your children to respect a burning candle, and of course keep burning candles away from flammable materials. Keep your home safe by remembering that a candle is magical, but fire can be very destructive. Be careful, and enjoy the beauty of your candles! Question 40: According to the text, what is needed to succeed at candle-making?

Tiếng Anh Tốt nghiệp THPT
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tính chất vật lý, hóa học, ứng dụng, điều chế cacbohiđrat

X và Y là hai cacbohiđrat. X là chất rắn, ở dạng bột vô định hình, màu trắng, không tan trong nước lạnh. Y là loại đường phổ biến nhất, có trong nhiều loài thực vật, có nhiều nhất trong cây mía, củ cải đường và hoa thốt nốt. Tên gọi của X, Y lần lượt là:

Hóa học Tốt nghiệp THPT
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Đề thi thử THPTQG năm 2019 chuẩn cấu trúc của bộ giáo dục có đáp án (Đề số 28)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the word or phrase that best fits each of the numbered blanks from 39 to 43 Someone once has said that there are three kinds of people who are interested in sport: People who (39)_______ part, people who watch, and people who watch (40)_______ television. It’s very easy to make fun of stay-at-home sports fans but on the other hand, television does enable us to enjoy all kinds of (41)_______ events. We can watch a racing car overtake another, see a cyclist cross the finishing line, or enjoy the goals of our favorite football (42)_______ The first time I watched a tennis match was on television, and I found it unexpectedly interesting. It’s not always easy to travel long distance to football grounds and television is a good solution. Of course, you can (43)_______ used to sitting indoors all the time, and this is dangerous. We should all try to keep fit, and have other interests and pastimes Điền vào ô số 39

Tiếng Anh Tốt nghiệp THPT
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tính chất vật lý, hóa học, ứng dụng, điều chế cacbohiđrat

Thủy phân đisaccarit X, thu được 2 monosaccarit Y, Z. Oxi hóa Y hoặc Z bằng dung dịch AgNO3/NH3, thu được chất hữu cơ T. Hai chất Y, Z lần lượt là:

Hóa học Tốt nghiệp THPT
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Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 28)

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. Thanks to electricity, candles are no longer a necessity in our lives, but they are still a pleasure. The warm flame of candlelight can quickly alter the mood and atmosphere of a room, often creating a peaceful scene that electric light just cannot match. Candles are an important part of many cultural and religious festival and have been burnt in various forms for centuries. The ancient Romans and Egyptians made candles from a type of fiber coated with wax. However, up until the nineteenth century, most candles were made from a substance called tallow, obtained from beef fat. Tallow candles were very smoky and, understandably, had an unpleasant odor. In the 19th century, candle makers learned to separate stearin, the solid form fat used as a type of glue, from tallow and used it to harden other fats. Candles that contained stearin would burn longer than previous ones and had a better smell. Stearin is still one of the main components of modern candle-making, and the techniques used to create candles today are much the same as they have been for many years. These days, the increase range of wax dyes, perfumes and other additives that are now available make candle making a very exciting and rewarding hobby. Sales of candles have increased greatly over the last few years, showing that they have become part of our lives again, not through necessity, but because of the magical atmosphere they create. In our increasingly stressful lives, the calming quality of candlelight has a relaxing effect that many enjoy. For those would like to learn to make candles, finding and buying candle-making kits is easy. Candle-making is definitely enhanced by the exciting possibilities of experimentation with various materials. Be brave and try out different effects - some of the most wonderful creations can happen by accident. With a bit of practice, you will be amazed at the very professional finish that can be achieved. Despite their delicate beauty, candles can, of course, be highly dangerous. One should never leave lit candles unattended, even for a few moments. Always make sure candles are securely placed within candleholders. Teach your children to respect a burning candle, and of course keep burning candles away from flammable materials. Keep your home safe by remembering that a candle is magical, but fire can be very destructive. Be careful, and enjoy the beauty of your candles! Question 39: According to the text, what does the increase of candle sales illustrate?

Tiếng Anh Tốt nghiệp THPT
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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 11)

After marriage, Mrs. Hoa always keeps a good _____ with her mother-in-law.

Tiếng Anh Tốt nghiệp THPT
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Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 13)

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. Someone left the messages,___________?

Tiếng Anh Tốt nghiệp THPT
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187 Bài trắc nghiệm Hàm số từ đề thi thử THPTQG 2019 cục hay có lời giải(P8)

Tìm tất cả các giá trị thực của tham số m để hệ phương trình sau có nghiệm x2+4x+y=m2x2+xy(x+2)=9

Toán Lớp 12
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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 11)

Mark the letter A, B, C; or D 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
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tính chất vật lý, hóa học, ứng dụng, điều chế cacbohiđrat

Cho sơ đồ phản ứng:  Hai chất X, Y lần lượt là:

Hóa học Tốt nghiệp THPT
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Đề thi thử THPTQG năm 2019 chuẩn cấu trúc của bộ giáo dục có đáp án (Đề số 28)

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 34 to 38 As a result of the recent oil crisis, 9.9 million of California’s 15 million motorists were subjected to an odd – even plan of gas rationing. The governor signed a bill forcing motorists with license plates ending in odd numbers to buy gas only on odd – numbered days, and those ending in even numbers on even – numbered days. Those whose plates were all letters or specially printed had to follow the odd – numbered plan. Exceptions were made only for emergencies and out – of – state – drivers. Those who could not get gas were forced to walk, bike, or skate to work. This plan was expected to eliminate the long lines at many service stations. Those who tried to purchase more than twenty gallons of gas or tried to fill a more than half filled tank would be fined and possibly imprisoned.   The word “eliminate” in the passage share the similar meaning with_____.

Tiếng Anh Tốt nghiệp THPT
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Ôn tập THPTGQ môn Hóa Học cực hay có đáp án (Đề số 19)

Thể tích (ml) dung dịch HCI 2M cần dùng để phản ứng vừa đủ với 41,385 gam anilin là:

Hóa học Tốt nghiệp THPT
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TÍNH CHẤT HÓA HỌC CỦA SẮT VÀ HỢP CHẤT

Nhỏ từ từ đến dư dung dịch NaOH loãng vào mỗi dung dịch sau: FeCl3, CuCl2, AlCl3, FeSO4. Sau khi các phản ứng xảy ra hoàn toàn, số trường hợp thu được kết tủa là

Hóa học Tốt nghiệp THPT
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Đề thi thử THPTQG năm 2019 chuẩn cấu trúc của bộ giáo dục có đáp án (Đề số 28)

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 34 to 38 As a result of the recent oil crisis, 9.9 million of California’s 15 million motorists were subjected to an odd – even plan of gas rationing. The governor signed a bill forcing motorists with license plates ending in odd numbers to buy gas only on odd – numbered days, and those ending in even numbers on even – numbered days. Those whose plates were all letters or specially printed had to follow the odd – numbered plan. Exceptions were made only for emergencies and out – of – state – drivers. Those who could not get gas were forced to walk, bike, or skate to work. This plan was expected to eliminate the long lines at many service stations. Those who tried to purchase more than twenty gallons of gas or tried to fill a more than half filled tank would be fined and possibly imprisoned.   California was forced to adopt this plan because _____.

Tiếng Anh Tốt nghiệp THPT
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Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 13)

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. It’s not easy to make Janet furious. The girl is very gentle by_____.

Tiếng Anh Tốt nghiệp THPT
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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 11)

Mark the letter A, B, C; or D 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 3.4 K lượt xem 5 năm trước
tính chất vật lý, hóa học, ứng dụng, điều chế cacbohiđrat

Cho các chất sau: glucozơ, fructozơ; saccarozơ, xenlulozơ. Những chất khi bị oxi hóa hoàn toàn thu được số mol CO2 lớn hơn số mol H2O là:

Hóa học Tốt nghiệp THPT
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Đề thi thử THPTQG năm 2019 chuẩn cấu trúc của bộ giáo dục có đáp án (Đề số 28)

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 34 to 38 As a result of the recent oil crisis, 9.9 million of California’s 15 million motorists were subjected to an odd – even plan of gas rationing. The governor signed a bill forcing motorists with license plates ending in odd numbers to buy gas only on odd – numbered days, and those ending in even numbers on even – numbered days. Those whose plates were all letters or specially printed had to follow the odd – numbered plan. Exceptions were made only for emergencies and out – of – state – drivers. Those who could not get gas were forced to walk, bike, or skate to work. This plan was expected to eliminate the long lines at many service stations. Those who tried to purchase more than twenty gallons of gas or tried to fill a more than half filled tank would be fined and possibly imprisoned.   The gas rationing plan was not binding on_______.

Tiếng Anh Tốt nghiệp THPT
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187 Bài trắc nghiệm Hàm số từ đề thi thử THPTQG 2019 cục hay có lời giải(P8)

Cho hàm số y=f(x) có đồ thị như hình vẽ. Số nghiệm thực của phương trình ffx-fx=0 là:

Toán Lớp 12
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Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 13)

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. Her family has gone to Edinburgh to pay their last_______ to uncle Bob who died last week.

Tiếng Anh Tốt nghiệp THPT
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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 11)

Mark the letter A, B, C or D to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

Tiếng Anh Tốt nghiệp THPT
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Đề thi thử THPTQG năm 2019 chuẩn cấu trúc của bộ giáo dục có đáp án (Đề số 28)

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 34 to 38 As a result of the recent oil crisis, 9.9 million of California’s 15 million motorists were subjected to an odd – even plan of gas rationing. The governor signed a bill forcing motorists with license plates ending in odd numbers to buy gas only on odd – numbered days, and those ending in even numbers on even – numbered days. Those whose plates were all letters or specially printed had to follow the odd – numbered plan. Exceptions were made only for emergencies and out – of – state – drivers. Those who could not get gas were forced to walk, bike, or skate to work. This plan was expected to eliminate the long lines at many service stations. Those who tried to purchase more than twenty gallons of gas or tried to fill a more than half filled tank would be fined and possibly imprisoned.   Those who violated the rationing program________.

Tiếng Anh Tốt nghiệp THPT
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Ôn tập THPTGQ môn Hóa Học cực hay có đáp án (Đề số 19)

Cho hỗn hợp gồm 12,8 gam Cu và 11,2 gam Fe phản ứng hoàn toàn với dung dịch HCI dư, thu được V lít H2(đktc). Giá trị của V là

Hóa học Tốt nghiệp THPT
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220 Bài tập đồ thị Hóa Học từ đề thi Đại Học cực hay có lời giải (Phần 6)

Dung dịch (A) chứa a mol Ba(OH)2 và m gam NaOH. Sục từ từ CO2 đến dư vào dung dịch (A) thấy lượng kết tủa biến đổi theo đồ thị dưới đây:  Giá trị của a và m lần lượt là

Hóa học Tốt nghiệp THPT
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Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 13)

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. Not only______a good physician but also a talented violist.

Tiếng Anh Tốt nghiệp THPT
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Đề thi thử THPTQG năm 2019 chuẩn cấu trúc của bộ giáo dục có đáp án (Đề số 28)

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 34 to 38 As a result of the recent oil crisis, 9.9 million of California’s 15 million motorists were subjected to an odd – even plan of gas rationing. The governor signed a bill forcing motorists with license plates ending in odd numbers to buy gas only on odd – numbered days, and those ending in even numbers on even – numbered days. Those whose plates were all letters or specially printed had to follow the odd – numbered plan. Exceptions were made only for emergencies and out – of – state – drivers. Those who could not get gas were forced to walk, bike, or skate to work. This plan was expected to eliminate the long lines at many service stations. Those who tried to purchase more than twenty gallons of gas or tried to fill a more than half filled tank would be fined and possibly imprisoned.   All of the following are true EXCEPT__________.

Tiếng Anh Tốt nghiệp THPT
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Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 28)

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. Thanks to electricity, candles are no longer a necessity in our lives, but they are still a pleasure. The warm flame of candlelight can quickly alter the mood and atmosphere of a room, often creating a peaceful scene that electric light just cannot match. Candles are an important part of many cultural and religious festival and have been burnt in various forms for centuries. The ancient Romans and Egyptians made candles from a type of fiber coated with wax. However, up until the nineteenth century, most candles were made from a substance called tallow, obtained from beef fat. Tallow candles were very smoky and, understandably, had an unpleasant odor. In the 19th century, candle makers learned to separate stearin, the solid form fat used as a type of glue, from tallow and used it to harden other fats. Candles that contained stearin would burn longer than previous ones and had a better smell. Stearin is still one of the main components of modern candle-making, and the techniques used to create candles today are much the same as they have been for many years. These days, the increase range of wax dyes, perfumes and other additives that are now available make candle making a very exciting and rewarding hobby. Sales of candles have increased greatly over the last few years, showing that they have become part of our lives again, not through necessity, but because of the magical atmosphere they create. In our increasingly stressful lives, the calming quality of candlelight has a relaxing effect that many enjoy. For those would like to learn to make candles, finding and buying candle-making kits is easy. Candle-making is definitely enhanced by the exciting possibilities of experimentation with various materials. Be brave and try out different effects - some of the most wonderful creations can happen by accident. With a bit of practice, you will be amazed at the very professional finish that can be achieved. Despite their delicate beauty, candles can, of course, be highly dangerous. One should never leave lit candles unattended, even for a few moments. Always make sure candles are securely placed within candleholders. Teach your children to respect a burning candle, and of course keep burning candles away from flammable materials. Keep your home safe by remembering that a candle is magical, but fire can be very destructive. Be careful, and enjoy the beauty of your candles! Question 38: Why was stearin used in candles?

Tiếng Anh Tốt nghiệp THPT
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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 11)

Mark the letter A, B, C or D to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

Tiếng Anh Tốt nghiệp THPT
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tính chất vật lý, hóa học, ứng dụng, điều chế cacbohiđrat

Cho các chất sau: glucozơ, fructozơ; saccarozơ, tinh bột, xenlulozơ. Những chất khi bị oxi hóa hoàn toàn thu được số mol CO2 bằng số mol H2O là:

Hóa học Tốt nghiệp THPT
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Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 13)

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. The process of______in plants involves a complex series of______reactions.

Tiếng Anh Tốt nghiệp THPT
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Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 28)

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. Thanks to electricity, candles are no longer a necessity in our lives, but they are still a pleasure. The warm flame of candlelight can quickly alter the mood and atmosphere of a room, often creating a peaceful scene that electric light just cannot match. Candles are an important part of many cultural and religious festival and have been burnt in various forms for centuries. The ancient Romans and Egyptians made candles from a type of fiber coated with wax. However, up until the nineteenth century, most candles were made from a substance called tallow, obtained from beef fat. Tallow candles were very smoky and, understandably, had an unpleasant odor. In the 19th century, candle makers learned to separate stearin, the solid form fat used as a type of glue, from tallow and used it to harden other fats. Candles that contained stearin would burn longer than previous ones and had a better smell. Stearin is still one of the main components of modern candle-making, and the techniques used to create candles today are much the same as they have been for many years. These days, the increase range of wax dyes, perfumes and other additives that are now available make candle making a very exciting and rewarding hobby. Sales of candles have increased greatly over the last few years, showing that they have become part of our lives again, not through necessity, but because of the magical atmosphere they create. In our increasingly stressful lives, the calming quality of candlelight has a relaxing effect that many enjoy. For those would like to learn to make candles, finding and buying candle-making kits is easy. Candle-making is definitely enhanced by the exciting possibilities of experimentation with various materials. Be brave and try out different effects - some of the most wonderful creations can happen by accident. With a bit of practice, you will be amazed at the very professional finish that can be achieved. Despite their delicate beauty, candles can, of course, be highly dangerous. One should never leave lit candles unattended, even for a few moments. Always make sure candles are securely placed within candleholders. Teach your children to respect a burning candle, and of course keep burning candles away from flammable materials. Keep your home safe by remembering that a candle is magical, but fire can be very destructive. Be careful, and enjoy the beauty of your candles! Question 37: Why dose the writer mention ancient Romans and Egyptians in the text?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 451 lượt xem 5 năm trước
Đề thi thử THPTQG năm 2019 chuẩn cấu trúc của bộ giáo dục có đáp án (Đề số 28)

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 24 to 33 Over the past 600 years, English has grown from a language of few speakers to become the dominant language of international communication. English as we know it today emerged around 1350, after having incorporated many elements of French that were introduced following the Norman invasion of 1066. Until the 1600s, English was, for the most part, spoken only in England and had not extended even as far as Wales, Scotland or Ireland. However, during the course of the next two centuries, English began to spread around the globe as a result of exploration, trade (including slave trade), colonization, and missionary work. Thus, small enclaves of English speakers became established and grew in various parts of the world. As these communities proliferated, English gradually became the primary language of international business, banking and diplomacy. Currently, about 80 percent of the information stored on computer systems worldwide is in English. Two-thirds of the world’s science writing is in English, and English is the main language of technology, advertising, media, international airports, and air traffic controllers. Today there are more than 700 million English users in the world, and over half of these are non-native speakers, constituting the largest number of non-native users than any other language in the world.   According to the passage, approximately how many non-native users of English are there in the world today?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 263 lượt xem 5 năm trước
Ôn tập THPTGQ môn Hóa Học cực hay có đáp án (Đề số 19)

Chất nào sau đây không tác dụng với NaOH trong dung dịch, đun nóng?

Hóa học Tốt nghiệp THPT
Xem chi tiết 1 K lượt xem 5 năm trước
187 Bài trắc nghiệm Hàm số từ đề thi thử THPTQG 2019 cục hay có lời giải(P8)

Cho hàm số y=f(x) có đồ thị như hình vẽ dưới đây. Gọi S là tập hợp tất cả các giá trị của tham số m để phương trình f(3-4-x2)=m có hai nghiệm phân biệt thuộc đoạn -2;3. Tìm tập S.

Toán Lớp 12
Xem chi tiết 842 lượt xem 5 năm trước
Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 13)

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. When I got my case back, it had been damaged__________repair.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 14.4 K lượt xem 5 năm trước
220 Bài tập đồ thị Hóa Học từ đề thi Đại Học cực hay có lời giải (Phần 6)

Dung dịch X gồm AlCl3 và HCl theo tỉ lệ mol tương ứng là 3:1. Dung dịch Y gồm NaOH và Ba(OH)2. Nhỏ từ từ dung dịch Y vào dung dịch X, số gam kết tủa phụ thuộc số mol OH- được biểu diễn theo sơ đồ sau:  Giá trị của a là:

Hóa học Tốt nghiệp THPT
Xem chi tiết 2.9 K lượt xem 5 năm trước
Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 28)

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. Thanks to electricity, candles are no longer a necessity in our lives, but they are still a pleasure. The warm flame of candlelight can quickly alter the mood and atmosphere of a room, often creating a peaceful scene that electric light just cannot match. Candles are an important part of many cultural and religious festival and have been burnt in various forms for centuries. The ancient Romans and Egyptians made candles from a type of fiber coated with wax. However, up until the nineteenth century, most candles were made from a substance called tallow, obtained from beef fat. Tallow candles were very smoky and, understandably, had an unpleasant odor. In the 19th century, candle makers learned to separate stearin, the solid form fat used as a type of glue, from tallow and used it to harden other fats. Candles that contained stearin would burn longer than previous ones and had a better smell. Stearin is still one of the main components of modern candle-making, and the techniques used to create candles today are much the same as they have been for many years. These days, the increase range of wax dyes, perfumes and other additives that are now available make candle making a very exciting and rewarding hobby. Sales of candles have increased greatly over the last few years, showing that they have become part of our lives again, not through necessity, but because of the magical atmosphere they create. In our increasingly stressful lives, the calming quality of candlelight has a relaxing effect that many enjoy. For those would like to learn to make candles, finding and buying candle-making kits is easy. Candle-making is definitely enhanced by the exciting possibilities of experimentation with various materials. Be brave and try out different effects - some of the most wonderful creations can happen by accident. With a bit of practice, you will be amazed at the very professional finish that can be achieved. Despite their delicate beauty, candles can, of course, be highly dangerous. One should never leave lit candles unattended, even for a few moments. Always make sure candles are securely placed within candleholders. Teach your children to respect a burning candle, and of course keep burning candles away from flammable materials. Keep your home safe by remembering that a candle is magical, but fire can be very destructive. Be careful, and enjoy the beauty of your candles! Question 36: According to the text, what is the importance of candles?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 833 lượt xem 5 năm trước
Đề thi thử THPTQG năm 2019 chuẩn cấu trúc của bộ giáo dục có đáp án (Đề số 28)

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 24 to 33 Over the past 600 years, English has grown from a language of few speakers to become the dominant language of international communication. English as we know it today emerged around 1350, after having incorporated many elements of French that were introduced following the Norman invasion of 1066. Until the 1600s, English was, for the most part, spoken only in England and had not extended even as far as Wales, Scotland or Ireland. However, during the course of the next two centuries, English began to spread around the globe as a result of exploration, trade (including slave trade), colonization, and missionary work. Thus, small enclaves of English speakers became established and grew in various parts of the world. As these communities proliferated, English gradually became the primary language of international business, banking and diplomacy. Currently, about 80 percent of the information stored on computer systems worldwide is in English. Two-thirds of the world’s science writing is in English, and English is the main language of technology, advertising, media, international airports, and air traffic controllers. Today there are more than 700 million English users in the world, and over half of these are non-native speakers, constituting the largest number of non-native users than any other language in the world.   The word “constituting” is closest in meaning to_______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 330 lượt xem 5 năm trước
Ôn tập THPTGQ môn Hóa Học cực hay có đáp án (Đề số 19)

Thủy phân hỗn hợp hai este gồm metyl axetat và etyl axetat trong dung dịch NaOH dư, đun nóng, sau phản ứng thu được

Hóa học Tốt nghiệp THPT
Xem chi tiết 58.6 K lượt xem 4 năm trước
Đề thi thử THPTQG năm 2019 chuẩn cấu trúc của bộ giáo dục có đáp án (Đề số 28)

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 24 to 33 Over the past 600 years, English has grown from a language of few speakers to become the dominant language of international communication. English as we know it today emerged around 1350, after having incorporated many elements of French that were introduced following the Norman invasion of 1066. Until the 1600s, English was, for the most part, spoken only in England and had not extended even as far as Wales, Scotland or Ireland. However, during the course of the next two centuries, English began to spread around the globe as a result of exploration, trade (including slave trade), colonization, and missionary work. Thus, small enclaves of English speakers became established and grew in various parts of the world. As these communities proliferated, English gradually became the primary language of international business, banking and diplomacy. Currently, about 80 percent of the information stored on computer systems worldwide is in English. Two-thirds of the world’s science writing is in English, and English is the main language of technology, advertising, media, international airports, and air traffic controllers. Today there are more than 700 million English users in the world, and over half of these are non-native speakers, constituting the largest number of non-native users than any other language in the world.   Which of the following is not mentioned as the field where English is the main language?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 374 lượt xem 5 năm trước
Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 13)

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. Without my parent’s support. I____ my oversea study.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 455 lượt xem 5 năm trước
Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 28)

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 28 to 35. Deforestation is the clearing, destroying, or otherwise removal of trees through deliberate, natural or accidental means. It can occur in any area densely populated by trees and other plant life, but the majority of it is currently happening in the Amazon rainforest. The loss of trees and other vegetation can cause climate change, desertification, soil erosion, fewer crops, flooding, increased greenhouse gases in the atmosphere, and a host of problems for indigenous people. Deforestation occurs for a number of reasons, including: farming, mostly cattle due to its quick turn around; and logging for materials and development. It has been happening for thousands of years, arguably since man began converting from hunter/gatherer to agricultural based societies, and required larger, unobstructed tracks of land to accommodate cattle, crops, and housing. It was only after the onset of the modern era that it became an epidemic. One of the most dangerous and unsettling effects of deforestation is the loss of animal and plant species due to their loss of habitat; not only do we lose those known to us, but also those unknown, potentially an even greater loss. Seventy percent of Earth's land animals and plants live in forests, and many cannot survive the deforestation that destroys their homes. The trees of the rainforest that provide shelter for some species also provide the canopy that regulates the temperature, a necessity for many others. Its removal through deforestation would allow a more drastic temperature variation from day to night, much like a desert, which could prove fatal for current inhabitants. In addition to the loss of habitat, the lack of trees also allows a greater amount of greenhouse gases to be released into the atmosphere. Presently, the tropical rainforests of South America are responsible for 20% of Earth's oxygen and they are disappearing at a rate of 4 hectares a decade. If these rates are not stopped and reversed, the consequences will become even more severe. The trees also help control the level of water in the atmosphere by helping to regulate the water cycle. With fewer trees left, due to deforestation, there is less water in the air to be returned to the soil. In turn, this causes dryer soil and the inability to grow crops, an ironic twist when considered against the fact that 80% of deforestation comes from small-scale agriculture and cattle ranching. Further effects of deforestation include soil erosion and coastal flooding, In addition to their previously mentioned roles, trees also function to retain water and topsoil, which provides the rich nutrients to sustain additional forest life. Without them, the soil erodes and washes away, causing farmers to move on and perpetuate the cycle. The barren land which is left behind in the wake of these unsustainable agricultural practices is then more susceptible to flooding, specifically in coastal regions. Coastal vegetation lessens the impact of waves and winds associated with a storm surge. Without this vegetation, coastal villages are susceptible to damaging floods. Question 35: The paragraph following the last paragraph in the passage may probably discuss _____.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 2.5 K lượt xem 5 năm trước
TÍNH CHẤT HÓA HỌC CỦA SẮT VÀ HỢP CHẤT

Nhúng một lá sắt (dư) vào dung dịch chứa một trong các chất sau: FeCl3, AlCl3, CuSO4, H2SO4 đặc, nóng. Sau phản ứng lấy lá sắt ra, có bao nhiêu trường hợp tạo muối sắt(II)?

Hóa học Tốt nghiệp THPT
Xem chi tiết 1.5 K lượt xem 5 năm trước
Đề thi thử THPTQG năm 2019 chuẩn cấu trúc của bộ giáo dục có đáp án (Đề số 28)

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 24 to 33 Over the past 600 years, English has grown from a language of few speakers to become the dominant language of international communication. English as we know it today emerged around 1350, after having incorporated many elements of French that were introduced following the Norman invasion of 1066. Until the 1600s, English was, for the most part, spoken only in England and had not extended even as far as Wales, Scotland or Ireland. However, during the course of the next two centuries, English began to spread around the globe as a result of exploration, trade (including slave trade), colonization, and missionary work. Thus, small enclaves of English speakers became established and grew in various parts of the world. As these communities proliferated, English gradually became the primary language of international business, banking and diplomacy. Currently, about 80 percent of the information stored on computer systems worldwide is in English. Two-thirds of the world’s science writing is in English, and English is the main language of technology, advertising, media, international airports, and air traffic controllers. Today there are more than 700 million English users in the world, and over half of these are non-native speakers, constituting the largest number of non-native users than any other language in the world.   The word “proliferated” is closest in meaning to_______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1.6 K lượt xem 5 năm trước
Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 13)

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. We are proud of our________staff, who are always friendly and courteous.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 12.7 K lượt xem 5 năm trước
Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 28)

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 28 to 35. Deforestation is the clearing, destroying, or otherwise removal of trees through deliberate, natural or accidental means. It can occur in any area densely populated by trees and other plant life, but the majority of it is currently happening in the Amazon rainforest. The loss of trees and other vegetation can cause climate change, desertification, soil erosion, fewer crops, flooding, increased greenhouse gases in the atmosphere, and a host of problems for indigenous people. Deforestation occurs for a number of reasons, including: farming, mostly cattle due to its quick turn around; and logging for materials and development. It has been happening for thousands of years, arguably since man began converting from hunter/gatherer to agricultural based societies, and required larger, unobstructed tracks of land to accommodate cattle, crops, and housing. It was only after the onset of the modern era that it became an epidemic. One of the most dangerous and unsettling effects of deforestation is the loss of animal and plant species due to their loss of habitat; not only do we lose those known to us, but also those unknown, potentially an even greater loss. Seventy percent of Earth's land animals and plants live in forests, and many cannot survive the deforestation that destroys their homes. The trees of the rainforest that provide shelter for some species also provide the canopy that regulates the temperature, a necessity for many others. Its removal through deforestation would allow a more drastic temperature variation from day to night, much like a desert, which could prove fatal for current inhabitants. In addition to the loss of habitat, the lack of trees also allows a greater amount of greenhouse gases to be released into the atmosphere. Presently, the tropical rainforests of South America are responsible for 20% of Earth's oxygen and they are disappearing at a rate of 4 hectares a decade. If these rates are not stopped and reversed, the consequences will become even more severe. The trees also help control the level of water in the atmosphere by helping to regulate the water cycle. With fewer trees left, due to deforestation, there is less water in the air to be returned to the soil. In turn, this causes dryer soil and the inability to grow crops, an ironic twist when considered against the fact that 80% of deforestation comes from small-scale agriculture and cattle ranching. Further effects of deforestation include soil erosion and coastal flooding, In addition to their previously mentioned roles, trees also function to retain water and topsoil, which provides the rich nutrients to sustain additional forest life. Without them, the soil erodes and washes away, causing farmers to move on and perpetuate the cycle. The barren land which is left behind in the wake of these unsustainable agricultural practices is then more susceptible to flooding, specifically in coastal regions. Coastal vegetation lessens the impact of waves and winds associated with a storm surge. Without this vegetation, coastal villages are susceptible to damaging floods. Question 34: Coastal regions are mentioned in the last paragraph as an example of regions that ____.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1.9 K lượt xem 5 năm trước
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