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DẠNG 1: BÀI TẬP ĐỐT CHÁY

Hỗn hợp X chứa 0,08 mol CH3CHO, 0,06 mol C4H4, 0,15 mol H2. Nung hỗn hợp X sau một thời gian thì thu được hỗn hợp Y có tỉ khối so với H2 là 34714.  Dẫn hỗn hợp Y qua dung dịch AgNO3 / NH3 dư sau khi phản ứng hoàn toàn thu được 0,12 mol hốn hợp kết tủa A trong đó có một kết tủa chiếm 56  về số mol, hốn hợp khí B thoát ra sau phản ứng làm mất màu vừa đủ 0,06 mol dung dịch Br2. Khối lượng kết tủa A gần nhất là:

Hóa học Lớp 12
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BÀI TẬP VỀ PHẢN ỨNG TRUNG HÒA

Hỗn hợp X gồm 2 axit cacboxylic. Chia X thành 2 phần bằng nhau. Phần 1: Cho phản ứng hoàn toàn với dung dịch AgNO3/NH3 dư thu được 21,6 gam bạc kim loại. Để trung hòa hoàn toàn phần 2 cần 200 ml dung dịch NaOH 1,0M. Phần trăm số mol của axit có công thức phân tử lớn hơn trong X là:

Hóa học Lớp 11
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BÀI TẬP VỀ PHẢN ỨNG TRUNG HÒA

Trung hòa hết a gam một axit đơn chức cần 150 ml dung dịch NaOH 1M thu được 12,3 gam muối. Công thức cấu tạo của axit là:

Hóa học Lớp 11
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30 đề thi thử đề thi thử THPTQG môn Tiếng Anh có lời giải chi tiết (Đề số 25)

VIII/ Read the following passage on commuting, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 61 to 70.After two decades of growing student enrollments and economic prosperity , business schools in the United States have started to face harder times. Only Harvard’s MBA School has shown a substantial increase in enrollments in recent years. Both Princeton and Stanford have seen decreases in their enrollments. Since 1990, the number of people receiving Masters in Business Administration (MBA) degrees, has dropped about 3 percent to 75,000, and the trend of lower enrollment rates is expected to continue.There are two factors causing this decrease in students seeking an MBA degree. The first one is that many graduates of four-year colleges are finding that an MBA degree does not guarantee a plush job on Wall Street or in other financial districts of major American cities . Many of the entry-level management jobs are for students graduating with Master of Arts degrees in English and the humanities as well as those holding MBA degrees. Students have asked the question, “ Is an MBA degree really what I need to be best prepared for getting a good job?” The second major factor has been the cutting of American payrolls and the lower number of entry-level jobs being offered. Business needs are changing , and MBA schools are struggling to meet the new demands.Which of the following business schools has NOT shown a decrease in enrollment? 

Tiếng Anh Tốt nghiệp THPT
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Đề thi thử THPT quốc gia năm 2019 môn tiếng anh chuẩn cấu trúc (Đề số 1)

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.         The handling and delivery of mail has always been a serious business, underpinned by the trust of the public in requiring timeliness, safety, and confidentiality. After early beginnings using horseback and stagecoach, and although cars and trucks later replaced stagecoaches and wagons, the Railway Mail Service still stands as one of America’s most resourceful and exciting postal innovations. This service began in 1832, but grew slowly until the Civil War. Then from 1862, by sorting the mail on board moving trains, the Post Office Department was able to decentralize its operations as railroads began to crisscross the nation on a regular basis, and speed up mail delivery. This service lasted until 1974. During peak decades of service, railway mail clerks handled 93% of all non-local mail and by 1905 the service had over 12,000 employees. Railway Post Office trains used a system of mail cranes to exchange mail at stations without stopping. As a train approached the crane, a clerk prepared the catcher arm which would then snatch the incoming mailbag in the blink of an eye. The clerk then booted out the outgoing mailbag. Experienced clerks were considered the elite of the Postal Service’s employees, and spoke with pride of making the switch at night with nothing but the curves and feel of the track to warn them of an upcoming catch. They also worked under the greatest pressure and their jobs were considered to be exhausting and dangerous. In addition to regular demands of their jobs they could find themselves the victims of train wrecks and robberies.        As successful as it was, “mail-on-the-fly” still had its share of glitches. If they hoisted the train’s catcher arm too soon, they risked hitting switch targets, telegraph poles or semaphores, which would rip the catcher arm off the train. Too late, and they would miss an exchange.The public expects the following three services in handling and delivery of mail except ___________

Tiếng Anh Tốt nghiệp THPT
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30 đề thi thử đề thi thử THPTQG môn Tiếng Anh có lời giải chi tiết (Đề số 25)

VIII/ Read the following passage on commuting, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 61 to 70.After two decades of growing student enrollments and economic prosperity , business schools in the United States have started to face harder times. Only Harvard’s MBA School has shown a substantial increase in enrollments in recent years. Both Princeton and Stanford have seen decreases in their enrollments. Since 1990, the number of people receiving Masters in Business Administration (MBA) degrees, has dropped about 3 percent to 75,000, and the trend of lower enrollment rates is expected to continue.There are two factors causing this decrease in students seeking an MBA degree. The first one is that many graduates of four-year colleges are finding that an MBA degree does not guarantee a plush job on Wall Street or in other financial districts of major American cities . Many of the entry-level management jobs are for students graduating with Master of Arts degrees in English and the humanities as well as those holding MBA degrees. Students have asked the question, “ Is an MBA degree really what I need to be best prepared for getting a good job?” The second major factor has been the cutting of American payrolls and the lower number of entry-level jobs being offered. Business needs are changing , and MBA schools are struggling to meet the new demands.The word “prosperity” in the first paragraph could best be replaced by_________. 

Tiếng Anh Tốt nghiệp THPT
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DẠNG 1: BÀI TẬP ĐỐT CHÁY

Hỗn hợp A gồm 2 chất hữu cơ A và B chỉ chứa các chức ancol và anđehit. A, B hơn kém nhau một nhóm chức. Thực hiện các thí nghiệm sau:Thí nghiệm 1: Lấy riêng A hoặc B đem đốt cháy đều được nCO2=nH2OThí nghiệm 2: Lấy cùng số mol mỗi chất cho tác dụng với Na dư đều thu được V lít khí H2.Thí nghiệm 3: Cũng lượng ở thí nghiệm 2 cho tác dụng với H2 thì cần 2V lít H2 (đo ở cùng điều kiện). Thí nghiệm 4: Thực hiện phản ứng oxi hóa 16,9 g hỗn hợp X (tỉ khối với H2 là 33,8) bằng Ag2O/NH3 để đưa anđehit thành axit thu được 32,4 g Ag. Sau đó thêm xúc tác để thực hiện phản ứng este hóa. Khối lượng este thu được tối đa là:

Hóa học Lớp 12
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Đề thi thử THPT quốc gia năm 2019 môn tiếng anh chuẩn cấu trúc (Đề số 1)

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.         The handling and delivery of mail has always been a serious business, underpinned by the trust of the public in requiring timeliness, safety, and confidentiality. After early beginnings using horseback and stagecoach, and although cars and trucks later replaced stagecoaches and wagons, the Railway Mail Service still stands as one of America’s most resourceful and exciting postal innovations. This service began in 1832, but grew slowly until the Civil War. Then from 1862, by sorting the mail on board moving trains, the Post Office Department was able to decentralize its operations as railroads began to crisscross the nation on a regular basis, and speed up mail delivery. This service lasted until 1974. During peak decades of service, railway mail clerks handled 93% of all non-local mail and by 1905 the service had over 12,000 employees. Railway Post Office trains used a system of mail cranes to exchange mail at stations without stopping. As a train approached the crane, a clerk prepared the catcher arm which would then snatch the incoming mailbag in the blink of an eye. The clerk then booted out the outgoing mailbag. Experienced clerks were considered the elite of the Postal Service’s employees, and spoke with pride of making the switch at night with nothing but the curves and feel of the track to warn them of an upcoming catch. They also worked under the greatest pressure and their jobs were considered to be exhausting and dangerous. In addition to regular demands of their jobs they could find themselves the victims of train wrecks and robberies.        As successful as it was, “mail-on-the-fly” still had its share of glitches. If they hoisted the train’s catcher arm too soon, they risked hitting switch targets, telegraph poles or semaphores, which would rip the catcher arm off the train. Too late, and they would miss an exchange.Which of the following is TRUE according to the passage?

Tiếng Anh Tốt nghiệp THPT
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30 đề thi thử đề thi thử THPTQG môn Tiếng Anh có lời giải chi tiết (Đề số 25)

VIII/ Read the following passage on commuting, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 61 to 70.After two decades of growing student enrollments and economic prosperity , business schools in the United States have started to face harder times. Only Harvard’s MBA School has shown a substantial increase in enrollments in recent years. Both Princeton and Stanford have seen decreases in their enrollments. Since 1990, the number of people receiving Masters in Business Administration (MBA) degrees, has dropped about 3 percent to 75,000, and the trend of lower enrollment rates is expected to continue.There are two factors causing this decrease in students seeking an MBA degree. The first one is that many graduates of four-year colleges are finding that an MBA degree does not guarantee a plush job on Wall Street or in other financial districts of major American cities . Many of the entry-level management jobs are for students graduating with Master of Arts degrees in English and the humanities as well as those holding MBA degrees. Students have asked the question, “ Is an MBA degree really what I need to be best prepared for getting a good job?” The second major factor has been the cutting of American payrolls and the lower number of entry-level jobs being offered. Business needs are changing , and MBA schools are struggling to meet the new demands.The phrase “two decades” in the first paragraph refers to a period of_________. 

Tiếng Anh Tốt nghiệp THPT
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Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P10)

Read the following passage and mark the letter A,B, C or D on your answer sheet to indicate the best answerMeditationMeditation has been in use for thousands of years: people have always searched for inner quiet and physical relaxation, which may be for spiritual, self-realization or health reasons. It is nothing unusual and you do not have to be a great athlete to be able to achieve and enjoy the benefits of meditation at both physical and mental levels.What, then, is meditation? As one expert put it recently, it is just sitting and relaxing. (A) Many people find that their lives are so full of the demands of work, family, friends and organized leisure pursuits that they have no time to “stand and state”. Many are so busy planning and working towards the future that they take little pleasure from the here and now. In their hurry to “get on” they miss out on the simple pleasures of life; the change of the seasons, the singing of a bird or the innocent wonder of a child. But beauty and joy are there to be seen and experienced, even in the most industrial of landscapes. (B) Meditation can be a good way of just taking time out and allowing yourself to relate to and appreciate the moment. It may be by walking along the seashore, or sitting by a stream, or just by noticing silence in a still room and enjoying it. (C)Rather than forcing yourself to take up a difficult physical position, just relax; sit in a chair or take a walk in a favorite landscape at a steady pace. It is not a good idea to slump or lie down, as this tend to leads to sleep. It is the relaxed focus that is necessary. If you sit down, do so with your feet flat on the floor, hands resting in your lap or on the arms of the chair, and your head comfortably balanced. If you are walking, do so slowly and carefully, aware of the movement of each foot, and the contact with the ground below. (D) Notice the reaction of the ground to your feet. This is an extremely simple but effective exercise in becoming truly aware of the present.Meditation, above all, is about staying with the moment, being in touch with one’s surroundings and one’s inner world, much of which is more easily achieved when you are in a meditative state.  At which point in the passage would the following sentence best fit? “In fact, in the harshest environments, meditation may be needed the most”

Tiếng Anh Tốt nghiệp THPT
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Đề thi thử THPT quốc gia năm 2019 môn tiếng anh chuẩn cấu trúc (Đề số 1)

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.         The handling and delivery of mail has always been a serious business, underpinned by the trust of the public in requiring timeliness, safety, and confidentiality. After early beginnings using horseback and stagecoach, and although cars and trucks later replaced stagecoaches and wagons, the Railway Mail Service still stands as one of America’s most resourceful and exciting postal innovations. This service began in 1832, but grew slowly until the Civil War. Then from 1862, by sorting the mail on board moving trains, the Post Office Department was able to decentralize its operations as railroads began to crisscross the nation on a regular basis, and speed up mail delivery. This service lasted until 1974. During peak decades of service, railway mail clerks handled 93% of all non-local mail and by 1905 the service had over 12,000 employees. Railway Post Office trains used a system of mail cranes to exchange mail at stations without stopping. As a train approached the crane, a clerk prepared the catcher arm which would then snatch the incoming mailbag in the blink of an eye. The clerk then booted out the outgoing mailbag. Experienced clerks were considered the elite of the Postal Service’s employees, and spoke with pride of making the switch at night with nothing but the curves and feel of the track to warn them of an upcoming catch. They also worked under the greatest pressure and their jobs were considered to be exhausting and dangerous. In addition to regular demands of their jobs they could find themselves the victims of train wrecks and robberies.        As successful as it was, “mail-on-the-fly” still had its share of glitches. If they hoisted the train’s catcher arm too soon, they risked hitting switch targets, telegraph poles or semaphores, which would rip the catcher arm off the train. Too late, and they would miss an exchange.The word “glitches” in the third paragraph can be replaced by _______

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 346 lượt xem 5 năm trước
Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P10)

Read the following passage and mark the letter A,B, C or D on your answer sheet to indicate the best answerMeditationMeditation has been in use for thousands of years: people have always searched for inner quiet and physical relaxation, which may be for spiritual, self-realization or health reasons. It is nothing unusual and you do not have to be a great athlete to be able to achieve and enjoy the benefits of meditation at both physical and mental levels.What, then, is meditation? As one expert put it recently, it is just sitting and relaxing. (A) Many people find that their lives are so full of the demands of work, family, friends and organized leisure pursuits that they have no time to “stand and state”. Many are so busy planning and working towards the future that they take little pleasure from the here and now. In their hurry to “get on” they miss out on the simple pleasures of life; the change of the seasons, the singing of a bird or the innocent wonder of a child. But beauty and joy are there to be seen and experienced, even in the most industrial of landscapes. (B) Meditation can be a good way of just taking time out and allowing yourself to relate to and appreciate the moment. It may be by walking along the seashore, or sitting by a stream, or just by noticing silence in a still room and enjoying it. (C)Rather than forcing yourself to take up a difficult physical position, just relax; sit in a chair or take a walk in a favorite landscape at a steady pace. It is not a good idea to slump or lie down, as this tend to leads to sleep. It is the relaxed focus that is necessary. If you sit down, do so with your feet flat on the floor, hands resting in your lap or on the arms of the chair, and your head comfortably balanced. If you are walking, do so slowly and carefully, aware of the movement of each foot, and the contact with the ground below. (D) Notice the reaction of the ground to your feet. This is an extremely simple but effective exercise in becoming truly aware of the present.Meditation, above all, is about staying with the moment, being in touch with one’s surroundings and one’s inner world, much of which is more easily achieved when you are in a meditative state.  According to the final paragraph, why is meditation useful?

Tiếng Anh Tốt nghiệp THPT
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Đề thi thử THPT quốc gia năm 2019 môn tiếng anh chuẩn cấu trúc (Đề số 1)

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.         The handling and delivery of mail has always been a serious business, underpinned by the trust of the public in requiring timeliness, safety, and confidentiality. After early beginnings using horseback and stagecoach, and although cars and trucks later replaced stagecoaches and wagons, the Railway Mail Service still stands as one of America’s most resourceful and exciting postal innovations. This service began in 1832, but grew slowly until the Civil War. Then from 1862, by sorting the mail on board moving trains, the Post Office Department was able to decentralize its operations as railroads began to crisscross the nation on a regular basis, and speed up mail delivery. This service lasted until 1974. During peak decades of service, railway mail clerks handled 93% of all non-local mail and by 1905 the service had over 12,000 employees. Railway Post Office trains used a system of mail cranes to exchange mail at stations without stopping. As a train approached the crane, a clerk prepared the catcher arm which would then snatch the incoming mailbag in the blink of an eye. The clerk then booted out the outgoing mailbag. Experienced clerks were considered the elite of the Postal Service’s employees, and spoke with pride of making the switch at night with nothing but the curves and feel of the track to warn them of an upcoming catch. They also worked under the greatest pressure and their jobs were considered to be exhausting and dangerous. In addition to regular demands of their jobs they could find themselves the victims of train wrecks and robberies.        As successful as it was, “mail-on-the-fly” still had its share of glitches. If they hoisted the train’s catcher arm too soon, they risked hitting switch targets, telegraph poles or semaphores, which would rip the catcher arm off the train. Too late, and they would miss an exchange.According to the passage, the Railway Mail Service commenced in _________.

Tiếng Anh Tốt nghiệp THPT
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Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P10)

Read the following passage and mark the letter A,B, C or D on your answer sheet to indicate the best answerMeditationMeditation has been in use for thousands of years: people have always searched for inner quiet and physical relaxation, which may be for spiritual, self-realization or health reasons. It is nothing unusual and you do not have to be a great athlete to be able to achieve and enjoy the benefits of meditation at both physical and mental levels.What, then, is meditation? As one expert put it recently, it is just sitting and relaxing. (A) Many people find that their lives are so full of the demands of work, family, friends and organized leisure pursuits that they have no time to “stand and state”. Many are so busy planning and working towards the future that they take little pleasure from the here and now. In their hurry to “get on” they miss out on the simple pleasures of life; the change of the seasons, the singing of a bird or the innocent wonder of a child. But beauty and joy are there to be seen and experienced, even in the most industrial of landscapes. (B) Meditation can be a good way of just taking time out and allowing yourself to relate to and appreciate the moment. It may be by walking along the seashore, or sitting by a stream, or just by noticing silence in a still room and enjoying it. (C)Rather than forcing yourself to take up a difficult physical position, just relax; sit in a chair or take a walk in a favorite landscape at a steady pace. It is not a good idea to slump or lie down, as this tend to leads to sleep. It is the relaxed focus that is necessary. If you sit down, do so with your feet flat on the floor, hands resting in your lap or on the arms of the chair, and your head comfortably balanced. If you are walking, do so slowly and carefully, aware of the movement of each foot, and the contact with the ground below. (D) Notice the reaction of the ground to your feet. This is an extremely simple but effective exercise in becoming truly aware of the present.Meditation, above all, is about staying with the moment, being in touch with one’s surroundings and one’s inner world, much of which is more easily achieved when you are in a meditative state.  Why is it important to notice the reaction of the ground to your feet in line 20?

Tiếng Anh Tốt nghiệp THPT
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DẠNG 1: BÀI TẬP ĐỐT CHÁY

Hỗn hợp X gồm anđehit, axetilen, propanđial và vinyl fomat (trong đó số mol của etanđial và axetilen bằng nhau). Đốt cháy hoàn toàn m gam hỗn hợp X cần dùng vừa đủ V lít O2 thu được 52,8 gam CO2. Mặt khác, đốt cháy hoàn toàn 0,1V lít hỗn hợp etan, propan cần 0,455V lít O2 thu được a gam CO2. Tính A?

Hóa học Lớp 12
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30 đề thi thử đề thi thử THPTQG môn Tiếng Anh có lời giải chi tiết (Đề số 25)

VIII/ Read the following passage on commuting, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 61 to 70.After two decades of growing student enrollments and economic prosperity , business schools in the United States have started to face harder times. Only Harvard’s MBA School has shown a substantial increase in enrollments in recent years. Both Princeton and Stanford have seen decreases in their enrollments. Since 1990, the number of people receiving Masters in Business Administration (MBA) degrees, has dropped about 3 percent to 75,000, and the trend of lower enrollment rates is expected to continue.There are two factors causing this decrease in students seeking an MBA degree. The first one is that many graduates of four-year colleges are finding that an MBA degree does not guarantee a plush job on Wall Street or in other financial districts of major American cities . Many of the entry-level management jobs are for students graduating with Master of Arts degrees in English and the humanities as well as those holding MBA degrees. Students have asked the question, “ Is an MBA degree really what I need to be best prepared for getting a good job?” The second major factor has been the cutting of American payrolls and the lower number of entry-level jobs being offered. Business needs are changing , and MBA schools are struggling to meet the new demands.What is the main focus of this passage?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 317 lượt xem 5 năm trước
Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P10)

Read the following passage and mark the letter A,B, C or D on your answer sheet to indicate the best answerMeditationMeditation has been in use for thousands of years: people have always searched for inner quiet and physical relaxation, which may be for spiritual, self-realization or health reasons. It is nothing unusual and you do not have to be a great athlete to be able to achieve and enjoy the benefits of meditation at both physical and mental levels.What, then, is meditation? As one expert put it recently, it is just sitting and relaxing. (A) Many people find that their lives are so full of the demands of work, family, friends and organized leisure pursuits that they have no time to “stand and state”. Many are so busy planning and working towards the future that they take little pleasure from the here and now. In their hurry to “get on” they miss out on the simple pleasures of life; the change of the seasons, the singing of a bird or the innocent wonder of a child. But beauty and joy are there to be seen and experienced, even in the most industrial of landscapes. (B) Meditation can be a good way of just taking time out and allowing yourself to relate to and appreciate the moment. It may be by walking along the seashore, or sitting by a stream, or just by noticing silence in a still room and enjoying it. (C)Rather than forcing yourself to take up a difficult physical position, just relax; sit in a chair or take a walk in a favorite landscape at a steady pace. It is not a good idea to slump or lie down, as this tend to leads to sleep. It is the relaxed focus that is necessary. If you sit down, do so with your feet flat on the floor, hands resting in your lap or on the arms of the chair, and your head comfortably balanced. If you are walking, do so slowly and carefully, aware of the movement of each foot, and the contact with the ground below. (D) Notice the reaction of the ground to your feet. This is an extremely simple but effective exercise in becoming truly aware of the present.Meditation, above all, is about staying with the moment, being in touch with one’s surroundings and one’s inner world, much of which is more easily achieved when you are in a meditative state.  How does the author recommend we walk when meditating?

Tiếng Anh Tốt nghiệp THPT
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Đề thi thử THPT quốc gia năm 2019 môn tiếng anh chuẩn cấu trúc (Đề số 1)

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.         The handling and delivery of mail has always been a serious business, underpinned by the trust of the public in requiring timeliness, safety, and confidentiality. After early beginnings using horseback and stagecoach, and although cars and trucks later replaced stagecoaches and wagons, the Railway Mail Service still stands as one of America’s most resourceful and exciting postal innovations. This service began in 1832, but grew slowly until the Civil War. Then from 1862, by sorting the mail on board moving trains, the Post Office Department was able to decentralize its operations as railroads began to crisscross the nation on a regular basis, and speed up mail delivery. This service lasted until 1974. During peak decades of service, railway mail clerks handled 93% of all non-local mail and by 1905 the service had over 12,000 employees. Railway Post Office trains used a system of mail cranes to exchange mail at stations without stopping. As a train approached the crane, a clerk prepared the catcher arm which would then snatch the incoming mailbag in the blink of an eye. The clerk then booted out the outgoing mailbag. Experienced clerks were considered the elite of the Postal Service’s employees, and spoke with pride of making the switch at night with nothing but the curves and feel of the track to warn them of an upcoming catch. They also worked under the greatest pressure and their jobs were considered to be exhausting and dangerous. In addition to regular demands of their jobs they could find themselves the victims of train wrecks and robberies.        As successful as it was, “mail-on-the-fly” still had its share of glitches. If they hoisted the train’s catcher arm too soon, they risked hitting switch targets, telegraph poles or semaphores, which would rip the catcher arm off the train. Too late, and they would miss an exchange.What does the passage mainly discuss?

Tiếng Anh Tốt nghiệp THPT
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20 đề thi thử THPTQG môn Sinh học năm 2019 - 2020 (Đề số 9)

Nơron thực hiện chủ yếu chức năng liên hệ, phối hợp trong hệ thần kinh là

Sinh học Tốt nghiệp THPT
Xem chi tiết 294 lượt xem 5 năm trước
Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P10)

Read the following passage and mark the letter A,B, C or D on your answer sheet to indicate the best answerMeditationMeditation has been in use for thousands of years: people have always searched for inner quiet and physical relaxation, which may be for spiritual, self-realization or health reasons. It is nothing unusual and you do not have to be a great athlete to be able to achieve and enjoy the benefits of meditation at both physical and mental levels.What, then, is meditation? As one expert put it recently, it is just sitting and relaxing. (A) Many people find that their lives are so full of the demands of work, family, friends and organized leisure pursuits that they have no time to “stand and state”. Many are so busy planning and working towards the future that they take little pleasure from the here and now. In their hurry to “get on” they miss out on the simple pleasures of life; the change of the seasons, the singing of a bird or the innocent wonder of a child. But beauty and joy are there to be seen and experienced, even in the most industrial of landscapes. (B) Meditation can be a good way of just taking time out and allowing yourself to relate to and appreciate the moment. It may be by walking along the seashore, or sitting by a stream, or just by noticing silence in a still room and enjoying it. (C)Rather than forcing yourself to take up a difficult physical position, just relax; sit in a chair or take a walk in a favorite landscape at a steady pace. It is not a good idea to slump or lie down, as this tend to leads to sleep. It is the relaxed focus that is necessary. If you sit down, do so with your feet flat on the floor, hands resting in your lap or on the arms of the chair, and your head comfortably balanced. If you are walking, do so slowly and carefully, aware of the movement of each foot, and the contact with the ground below. (D) Notice the reaction of the ground to your feet. This is an extremely simple but effective exercise in becoming truly aware of the present.Meditation, above all, is about staying with the moment, being in touch with one’s surroundings and one’s inner world, much of which is more easily achieved when you are in a meditative state.  According to the author, what is the best seated position for meditation?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 251 lượt xem 5 năm trước
30 đề thi thử đề thi thử THPTQG môn Tiếng Anh có lời giải chi tiết (Đề số 25)

Read the following passage on commuting, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 51 to 60.Many folk cures which have been around for centuries may be more therapeutic than previously suspected. A case in point is that of penicillin Alexander Fleming did not just randomly choose cheese molds to study when he discovered this very important bacteria-killing substance. Moldy cheese was frequently given to patients as a remedy for illness at one time Fleming just isolated what it was about the cheese which cured the patients.In parts of South America, a powder obtained from grinding sugar cane is used for healing infections in wounds and ulcers. This usage may date back to pre-Colombian times. Experiments carried out on several hundred patients indicate that ordinary sugar in high concentrations is lethal to bacteria. Its suction effect eliminates dead cells and it generates a glasslike layer which protects the wound and ensures healing.Another example of folk medicine which scientists are investigating is that of Arab fishermen who rub their wounds with a venomous catfish to quicken healing. This catfish excretes a gellike slime which scientist found to contain antibiotics coagulant that helps close injured blood vessels, anti-inflammatory agents, and a chemical that directs production of a glue-like material that aids healing.It is hoped that by documenting these folk remedies and experimenting to see if results are indeed beneficial, an analysis of the substance be made, and synthetic substances be developed for human consumption. According to the passage, why is it important to study folk medicine?  

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1.5 K lượt xem 5 năm trước
20 đề thi thử THPTQG môn Sinh học năm 2019 - 2020 (Đề số 9)

Trong các hình thức vận động sinh trưởng sau đây, hình thức vận động nào không liên quan đến sinh trưởng của tế bào?

Sinh học Tốt nghiệp THPT
Xem chi tiết 5.2 K lượt xem 5 năm trước
Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P10)

Read the following passage and mark the letter A,B, C or D on your answer sheet to indicate the best answerMeditationMeditation has been in use for thousands of years: people have always searched for inner quiet and physical relaxation, which may be for spiritual, self-realization or health reasons. It is nothing unusual and you do not have to be a great athlete to be able to achieve and enjoy the benefits of meditation at both physical and mental levels.What, then, is meditation? As one expert put it recently, it is just sitting and relaxing. (A) Many people find that their lives are so full of the demands of work, family, friends and organized leisure pursuits that they have no time to “stand and state”. Many are so busy planning and working towards the future that they take little pleasure from the here and now. In their hurry to “get on” they miss out on the simple pleasures of life; the change of the seasons, the singing of a bird or the innocent wonder of a child. But beauty and joy are there to be seen and experienced, even in the most industrial of landscapes. (B) Meditation can be a good way of just taking time out and allowing yourself to relate to and appreciate the moment. It may be by walking along the seashore, or sitting by a stream, or just by noticing silence in a still room and enjoying it. (C)Rather than forcing yourself to take up a difficult physical position, just relax; sit in a chair or take a walk in a favorite landscape at a steady pace. It is not a good idea to slump or lie down, as this tend to leads to sleep. It is the relaxed focus that is necessary. If you sit down, do so with your feet flat on the floor, hands resting in your lap or on the arms of the chair, and your head comfortably balanced. If you are walking, do so slowly and carefully, aware of the movement of each foot, and the contact with the ground below. (D) Notice the reaction of the ground to your feet. This is an extremely simple but effective exercise in becoming truly aware of the present.Meditation, above all, is about staying with the moment, being in touch with one’s surroundings and one’s inner world, much of which is more easily achieved when you are in a meditative state.  What is one thing the author recommends you do when meditating?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 246 lượt xem 5 năm trước
Đề thi thử THPT quốc gia năm 2019 môn tiếng anh chuẩn cấu trúc (Đề số 1)

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.         The handling and delivery of mail has always been a serious business, underpinned by the trust of the public in requiring timeliness, safety, and confidentiality. After early beginnings using horseback and stagecoach, and although cars and trucks later replaced stagecoaches and wagons, the Railway Mail Service still stands as one of America’s most resourceful and exciting postal innovations. This service began in 1832, but grew slowly until the Civil War. Then from 1862, by sorting the mail on board moving trains, the Post Office Department was able to decentralize its operations as railroads began to crisscross the nation on a regular basis, and speed up mail delivery. This service lasted until 1974. During peak decades of service, railway mail clerks handled 93% of all non-local mail and by 1905 the service had over 12,000 employees. Railway Post Office trains used a system of mail cranes to exchange mail at stations without stopping. As a train approached the crane, a clerk prepared the catcher arm which would then snatch the incoming mailbag in the blink of an eye. The clerk then booted out the outgoing mailbag. Experienced clerks were considered the elite of the Postal Service’s employees, and spoke with pride of making the switch at night with nothing but the curves and feel of the track to warn them of an upcoming catch. They also worked under the greatest pressure and their jobs were considered to be exhausting and dangerous. In addition to regular demands of their jobs they could find themselves the victims of train wrecks and robberies.        As successful as it was, “mail-on-the-fly” still had its share of glitches. If they hoisted the train’s catcher arm too soon, they risked hitting switch targets, telegraph poles or semaphores, which would rip the catcher arm off the train. Too late, and they would miss an exchange.The word “elite” in the second paragraph is closest in meaning to ___________.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 506 lượt xem 5 năm trước
Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P10)

Read the following passage and mark the letter A,B, C or D on your answer sheet to indicate the best answerMeditationMeditation has been in use for thousands of years: people have always searched for inner quiet and physical relaxation, which may be for spiritual, self-realization or health reasons. It is nothing unusual and you do not have to be a great athlete to be able to achieve and enjoy the benefits of meditation at both physical and mental levels.What, then, is meditation? As one expert put it recently, it is just sitting and relaxing. (A) Many people find that their lives are so full of the demands of work, family, friends and organized leisure pursuits that they have no time to “stand and state”. Many are so busy planning and working towards the future that they take little pleasure from the here and now. In their hurry to “get on” they miss out on the simple pleasures of life; the change of the seasons, the singing of a bird or the innocent wonder of a child. But beauty and joy are there to be seen and experienced, even in the most industrial of landscapes. (B) Meditation can be a good way of just taking time out and allowing yourself to relate to and appreciate the moment. It may be by walking along the seashore, or sitting by a stream, or just by noticing silence in a still room and enjoying it. (C)Rather than forcing yourself to take up a difficult physical position, just relax; sit in a chair or take a walk in a favorite landscape at a steady pace. It is not a good idea to slump or lie down, as this tend to leads to sleep. It is the relaxed focus that is necessary. If you sit down, do so with your feet flat on the floor, hands resting in your lap or on the arms of the chair, and your head comfortably balanced. If you are walking, do so slowly and carefully, aware of the movement of each foot, and the contact with the ground below. (D) Notice the reaction of the ground to your feet. This is an extremely simple but effective exercise in becoming truly aware of the present.Meditation, above all, is about staying with the moment, being in touch with one’s surroundings and one’s inner world, much of which is more easily achieved when you are in a meditative state.  Which one of the following situations does the passage say will help you meditate?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 273 lượt xem 5 năm trước
Đề thi thử THPT quốc gia năm 2019 môn tiếng anh chuẩn cấu trúc (Đề số 1)

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.         The handling and delivery of mail has always been a serious business, underpinned by the trust of the public in requiring timeliness, safety, and confidentiality. After early beginnings using horseback and stagecoach, and although cars and trucks later replaced stagecoaches and wagons, the Railway Mail Service still stands as one of America’s most resourceful and exciting postal innovations. This service began in 1832, but grew slowly until the Civil War. Then from 1862, by sorting the mail on board moving trains, the Post Office Department was able to decentralize its operations as railroads began to crisscross the nation on a regular basis, and speed up mail delivery. This service lasted until 1974. During peak decades of service, railway mail clerks handled 93% of all non-local mail and by 1905 the service had over 12,000 employees. Railway Post Office trains used a system of mail cranes to exchange mail at stations without stopping. As a train approached the crane, a clerk prepared the catcher arm which would then snatch the incoming mailbag in the blink of an eye. The clerk then booted out the outgoing mailbag. Experienced clerks were considered the elite of the Postal Service’s employees, and spoke with pride of making the switch at night with nothing but the curves and feel of the track to warn them of an upcoming catch. They also worked under the greatest pressure and their jobs were considered to be exhausting and dangerous. In addition to regular demands of their jobs they could find themselves the victims of train wrecks and robberies.        As successful as it was, “mail-on-the-fly” still had its share of glitches. If they hoisted the train’s catcher arm too soon, they risked hitting switch targets, telegraph poles or semaphores, which would rip the catcher arm off the train. Too late, and they would miss an exchange.Which of the following can be inferred from the first paragraph?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 657 lượt xem 5 năm trước
30 đề thi thử đề thi thử THPTQG môn Tiếng Anh có lời giải chi tiết (Đề số 25)

Read the following passage on commuting, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 51 to 60.Many folk cures which have been around for centuries may be more therapeutic than previously suspected. A case in point is that of penicillin Alexander Fleming did not just randomly choose cheese molds to study when he discovered this very important bacteria-killing substance. Moldy cheese was frequently given to patients as a remedy for illness at one time Fleming just isolated what it was about the cheese which cured the patients.In parts of South America, a powder obtained from grinding sugar cane is used for healing infections in wounds and ulcers. This usage may date back to pre-Colombian times. Experiments carried out on several hundred patients indicate that ordinary sugar in high concentrations is lethal to bacteria. Its suction effect eliminates dead cells and it generates a glasslike layer which protects the wound and ensures healing.Another example of folk medicine which scientists are investigating is that of Arab fishermen who rub their wounds with a venomous catfish to quicken healing. This catfish excretes a gellike slime which scientist found to contain antibiotics coagulant that helps close injured blood vessels, anti-inflammatory agents, and a chemical that directs production of a glue-like material that aids healing.It is hoped that by documenting these folk remedies and experimenting to see if results are indeed beneficial, an analysis of the substance be made, and synthetic substances be developed for human consumption.In what way are cheese molds, sugar, and catfish slime similar? 

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1.3 K lượt xem 5 năm trước
20 đề thi thử THPTQG môn Sinh học năm 2019 - 2020 (Đề số 9)

Phát biểu nào đúng khi nói về các nhân tố tiến hoá:

Sinh học Tốt nghiệp THPT
Xem chi tiết 358 lượt xem 5 năm trước
Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P10)

Read the following passage and mark the letter A,B, C or D on your answer sheet to indicate the best answerMeditationMeditation has been in use for thousands of years: people have always searched for inner quiet and physical relaxation, which may be for spiritual, self-realization or health reasons. It is nothing unusual and you do not have to be a great athlete to be able to achieve and enjoy the benefits of meditation at both physical and mental levels.What, then, is meditation? As one expert put it recently, it is just sitting and relaxing. (A) Many people find that their lives are so full of the demands of work, family, friends and organized leisure pursuits that they have no time to “stand and state”. Many are so busy planning and working towards the future that they take little pleasure from the here and now. In their hurry to “get on” they miss out on the simple pleasures of life; the change of the seasons, the singing of a bird or the innocent wonder of a child. But beauty and joy are there to be seen and experienced, even in the most industrial of landscapes. (B) Meditation can be a good way of just taking time out and allowing yourself to relate to and appreciate the moment. It may be by walking along the seashore, or sitting by a stream, or just by noticing silence in a still room and enjoying it. (C)Rather than forcing yourself to take up a difficult physical position, just relax; sit in a chair or take a walk in a favorite landscape at a steady pace. It is not a good idea to slump or lie down, as this tend to leads to sleep. It is the relaxed focus that is necessary. If you sit down, do so with your feet flat on the floor, hands resting in your lap or on the arms of the chair, and your head comfortably balanced. If you are walking, do so slowly and carefully, aware of the movement of each foot, and the contact with the ground below. (D) Notice the reaction of the ground to your feet. This is an extremely simple but effective exercise in becoming truly aware of the present.Meditation, above all, is about staying with the moment, being in touch with one’s surroundings and one’s inner world, much of which is more easily achieved when you are in a meditative state.  According to the passage, why is meditation important

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 265 lượt xem 5 năm trước
DẠNG 1: BÀI TẬP ĐỐT CHÁY

Hỗn hợp E chứa hai anđehit X, Y đều mạch hở, không phân nhánh và số nguyên tử C trong Y nhiều hơn X là 1. Hiđro hóa hoàn toàn 2,18 gam hỗn hợp E cần dùng 2,464 lít (đktc) khí H2 (Xúc tác Ni, t­o được F chứa 2 ancol tương ứng. Đốt cháy hoàn toàn F cần dùng 0,155 mol O2, thu được 2,464 lít CO2 (đktc). Nếu đun nóng 0,048 mol E với một lượng dư dung dịch AgNO3 trong môi trường amoniac thì thu được m gam kết tủa. Giá trị của m gần giá trị nào nhất sau đây?

Hóa học Lớp 12
Xem chi tiết 3.8 K lượt xem 5 năm trước
Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P10)

Read the following passage and mark the letter A,B, C or D on your answer sheet to indicate the best answerMeditationMeditation has been in use for thousands of years: people have always searched for inner quiet and physical relaxation, which may be for spiritual, self-realization or health reasons. It is nothing unusual and you do not have to be a great athlete to be able to achieve and enjoy the benefits of meditation at both physical and mental levels.What, then, is meditation? As one expert put it recently, it is just sitting and relaxing. (A) Many people find that their lives are so full of the demands of work, family, friends and organized leisure pursuits that they have no time to “stand and state”. Many are so busy planning and working towards the future that they take little pleasure from the here and now. In their hurry to “get on” they miss out on the simple pleasures of life; the change of the seasons, the singing of a bird or the innocent wonder of a child. But beauty and joy are there to be seen and experienced, even in the most industrial of landscapes. (B) Meditation can be a good way of just taking time out and allowing yourself to relate to and appreciate the moment. It may be by walking along the seashore, or sitting by a stream, or just by noticing silence in a still room and enjoying it. (C)Rather than forcing yourself to take up a difficult physical position, just relax; sit in a chair or take a walk in a favorite landscape at a steady pace. It is not a good idea to slump or lie down, as this tend to leads to sleep. It is the relaxed focus that is necessary. If you sit down, do so with your feet flat on the floor, hands resting in your lap or on the arms of the chair, and your head comfortably balanced. If you are walking, do so slowly and carefully, aware of the movement of each foot, and the contact with the ground below. (D) Notice the reaction of the ground to your feet. This is an extremely simple but effective exercise in becoming truly aware of the present.Meditation, above all, is about staying with the moment, being in touch with one’s surroundings and one’s inner world, much of which is more easily achieved when you are in a meditative state.  What does meditation involve?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 234 lượt xem 5 năm trước
20 đề thi thử THPTQG môn Sinh học năm 2019 - 2020 (Đề số 9)

Nếu RQ > 1 nghĩa là

Sinh học Tốt nghiệp THPT
Xem chi tiết 572 lượt xem 5 năm trước
Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P10)

Read the following passage and mark the letter A,B, C or D on your answer sheet to indicate the best answerMeditationMeditation has been in use for thousands of years: people have always searched for inner quiet and physical relaxation, which may be for spiritual, self-realization or health reasons. It is nothing unusual and you do not have to be a great athlete to be able to achieve and enjoy the benefits of meditation at both physical and mental levels.What, then, is meditation? As one expert put it recently, it is just sitting and relaxing. (A) Many people find that their lives are so full of the demands of work, family, friends and organized leisure pursuits that they have no time to “stand and state”. Many are so busy planning and working towards the future that they take little pleasure from the here and now. In their hurry to “get on” they miss out on the simple pleasures of life; the change of the seasons, the singing of a bird or the innocent wonder of a child. But beauty and joy are there to be seen and experienced, even in the most industrial of landscapes. (B) Meditation can be a good way of just taking time out and allowing yourself to relate to and appreciate the moment. It may be by walking along the seashore, or sitting by a stream, or just by noticing silence in a still room and enjoying it. (C)Rather than forcing yourself to take up a difficult physical position, just relax; sit in a chair or take a walk in a favorite landscape at a steady pace. It is not a good idea to slump or lie down, as this tend to leads to sleep. It is the relaxed focus that is necessary. If you sit down, do so with your feet flat on the floor, hands resting in your lap or on the arms of the chair, and your head comfortably balanced. If you are walking, do so slowly and carefully, aware of the movement of each foot, and the contact with the ground below. (D) Notice the reaction of the ground to your feet. This is an extremely simple but effective exercise in becoming truly aware of the present.Meditation, above all, is about staying with the moment, being in touch with one’s surroundings and one’s inner world, much of which is more easily achieved when you are in a meditative state.  What is needed for someone to learn meditation?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 343 lượt xem 5 năm trước
Đề luyện thi THPT Quốc Gia - Năm 2020 Môn thi: TIẾNG ANH (Đề số 2)

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.Seth informed us of his retirement from the company. He did it when arriving at the meeting.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 92.8 K lượt xem 5 năm trước
30 đề thi thử đề thi thử THPTQG môn Tiếng Anh có lời giải chi tiết (Đề số 25)

Read the following passage on commuting, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 51 to 60.Many folk cures which have been around for centuries may be more therapeutic than previously suspected. A case in point is that of penicillin Alexander Fleming did not just randomly choose cheese molds to study when he discovered this very important bacteria-killing substance. Moldy cheese was frequently given to patients as a remedy for illness at one time Fleming just isolated what it was about the cheese which cured the patients.In parts of South America, a powder obtained from grinding sugar cane is used for healing infections in wounds and ulcers. This usage may date back to pre-Colombian times. Experiments carried out on several hundred patients indicate that ordinary sugar in high concentrations is lethal to bacteria. Its suction effect eliminates dead cells and it generates a glasslike layer which protects the wound and ensures healing.Another example of folk medicine which scientists are investigating is that of Arab fishermen who rub their wounds with a venomous catfish to quicken healing. This catfish excretes a gellike slime which scientist found to contain antibiotics coagulant that helps close injured blood vessels, anti-inflammatory agents, and a chemical that directs production of a glue-like material that aids healing.It is hoped that by documenting these folk remedies and experimenting to see if results are indeed beneficial, an analysis of the substance be made, and synthetic substances be developed for human consumption. The word "consumption" in the last paragraph is closest in meaning to_________.  

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 327 lượt xem 5 năm trước
20 đề thi thử THPTQG môn Sinh học năm 2019 - 2020 (Đề số 9)

Màu sắc của chất nào không liên quan đến chức năng của nó?

Sinh học Tốt nghiệp THPT
Xem chi tiết 2.9 K lượt xem 5 năm trước
Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P10)

Mark the letter A,B,C or D on your answer sheet to show the underlined part that needs correction in each of the following question There are a number of (A) reason why population (B) is concentrated in temperate regions, but the wide variety and (C) availability of animal and vegetable life may be (D) the most important

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 3.5 K lượt xem 7 tháng trước
20 đề thi thử THPTQG môn Sinh học năm 2019 - 2020 (Đề số 9)

Loại vi khuẩn trong đất không có lợi cho thực vật là

Sinh học Tốt nghiệp THPT
Xem chi tiết 14.1 K lượt xem 5 năm trước
Đề luyện thi THPT Quốc Gia - Năm 2020 Môn thi: TIẾNG ANH (Đề số 2)

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.Julian dropped out of college after his first year. Now he regrets it.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 68.8 K lượt xem 5 năm trước
Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P10)

Mark the letter A,B,C or D on your answer sheet to show the underlined part that needs correction in each of the following question(A) Despite his (B)  broken legs, he managed to (C) get out of the car before (D) exploding

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1 K lượt xem 5 năm trước
Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P10)

Mark the letter A,B,C or D on your answer sheet to show the underlined part that needs correction in each of the following questionIn order for a doctor to (A) practice medicine in any hospital, it must be proved (B) that the doctor has the (C) qualities to do (D) so.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 5.9 K lượt xem 5 năm trước
Đề luyện thi THPT Quốc Gia - Năm 2020 Môn thi: TIẾNG ANH (Đề số 2)

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.The demand was so great that they had to reprint the book immediately.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 61.6 K lượt xem 5 năm trước
20 đề thi thử THPTQG môn Sinh học năm 2019 - 2020 (Đề số 9)

Dưới đây là tháp sinh thái biểu diễn mối tương quan về sinh khối tương đối giữa động vật phù du và thực vật phù du trong hệ sinh thái đại dương:Sinh khối của động vật phù du lớn hơn sinh khối của thực vật phù du bởi vì:

Sinh học Tốt nghiệp THPT
Xem chi tiết 4.8 K lượt xem 5 năm trước
30 đề thi thử thpt quốc gia tiếng anh năm 2020 cực hay có lời giải (Đề số 15)

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.            Living things include both the visible world of animals and plants as well as the invisible world of bacteria and viruses. On a basic level, we can say that life is ordered.  Organisms have an enormously complex organization. Life can also “work”. Living creatures can take in energy from the environment. This energy, in the form of food, is changed to maintain metabolic processes and for survival. Life grows and develops. This means more than just getting larger in size. Living organisms also have the ability to rebuild and repair themselves when injured.  Life can reproduce. Life can only come from other living creatures. Life can respond.  Think about the last time you accidentally stubbed your toe. Almost instantly, you moved back in pain. Finally, life can adapt and respond to the demands placed on it by the environment. There are three basic types of adaptations that can occur in higher organisms.          Reversible changes occur as a response to changes in the environment. Let's say you live near sea level and you travel to a mountainous area. You may begin to experience difficulty breathing and an increase in heart rate as a result of the change in height. These signs of sickness go away when you go back down to sea level.          Body- related changes happen as a result of prolonged changes in the environment. Using the previous example, if you were to stay in the mountainous area for a long time, you would notice that your heart rate would begin to slow down and you would begin to breath normally. These changes are also reversible. Genotypic changes (caused by genetic change) take place within the genetic make up of the organism and are not reversible. An example would be the development of resistance to bug-killing chemicals by insects and spiders.Question:What is the energy for the living things called?

Tiếng Anh Tốt nghiệp THPT
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30 đề thi thử đề thi thử THPTQG môn Tiếng Anh có lời giải chi tiết (Đề số 25)

Read the following passage on commuting, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 51 to 60.Many folk cures which have been around for centuries may be more therapeutic than previously suspected. A case in point is that of penicillin Alexander Fleming did not just randomly choose cheese molds to study when he discovered this very important bacteria-killing substance. Moldy cheese was frequently given to patients as a remedy for illness at one time Fleming just isolated what it was about the cheese which cured the patients.In parts of South America, a powder obtained from grinding sugar cane is used for healing infections in wounds and ulcers. This usage may date back to pre-Colombian times. Experiments carried out on several hundred patients indicate that ordinary sugar in high concentrations is lethal to bacteria. Its suction effect eliminates dead cells and it generates a glasslike layer which protects the wound and ensures healing.Another example of folk medicine which scientists are investigating is that of Arab fishermen who rub their wounds with a venomous catfish to quicken healing. This catfish excretes a gellike slime which scientist found to contain antibiotics coagulant that helps close injured blood vessels, anti-inflammatory agents, and a chemical that directs production of a glue-like material that aids healing.It is hoped that by documenting these folk remedies and experimenting to see if results are indeed beneficial, an analysis of the substance be made, and synthetic substances be developed for human consumption. Which one of the following is NOT an important quality of the catfish slime?

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DẠNG 1: BÀI TẬP ĐỐT CHÁY

Đốt cháy hoàn toàn 0,6 mol hỗn hợp E chứa ancol X; este đơn chức Y và anđehit Z (X, Y, Z đều no, mạch hở và có cùng số nguyên tử hiđro) có tỉ lệ mol tương ứng 3: 1: 2 thu được 24,64 lít CO2 (đktc) và 21,6 gam nước. Mặt khác, cho 0,6 mol hỗn hợp E trên tác dụng với dung dịch AgNO3 dư trong NH3, đun nóng thu được m gam Ag. Giá trị m là:

Hóa học Lớp 12
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Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P10)

Mark the letter A,B,C or D on your answer sheet to show the underlined part that needs correction in each of the following questionExperiments show that, for a bird, (A) doing a bird nest is (B) as (C) instinctive as (D) feeding.

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Đề luyện thi THPT Quốc Gia - Năm 2020 Môn thi: TIẾNG ANH (Đề số 2)

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.If only you told me the truth about the theft.

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20 đề thi thử THPTQG môn Sinh học năm 2019 - 2020 (Đề số 9)

Cho cây dị hợp về 2 cặp gen có kiểu hình thân cao lai với cây thân thấp (P), đời con có 62,5% cây thân thấp : 37,5% cây thân cao. Có bao nhiêu kết luận nào sau đây không đúng?(1) Cho cây dị hợp hai cặp gen lai phân tích thì đời con có tỉ lệ phân li kiểu hình là 1:3.(2) Có 3 dòng thuần chủng về tính trạng cây cao.(3) Cây thấp ở thế hệ P dị hợp về một cặp gen.(4) Tính trạng chiều cao cây di truyền theo quy luật tương tác bổ sung.

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Tổng hợp đề thi thử mới nhất môn tiếng anh cực hay có lời giải (P10)

Mark the letter A,B,C or D on your answer sheet to show the underlined part that needs correction in each of the following question(A) One of the students who (B) are being considered (C) for the scholarship (D) are from this university

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