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 questionsSome experts think that a meteor impact, which occurred around...

Đáp án D Dịch đề: Một vài nhà khoa học cho rằng ảnh hưởng của một thiên thạch, mà xảy ra cách đây khoảng 65 triệu năm, có thể đã gây ra sự tuyệt chủng của loài khủng long. Cấu trúc dự đoán trong QK: may/could have been + VII Các đáp án A, B, C đều không chính xác vì làm thay đổi mức độ chính xác của dự đoán àchọn D Dịch: Theo quan điểm của một số nhà khoa học, sự tuyển chủng của loài khủng long có thể là kết quả của sự ảnh hưởng của một vụ thiên thạch xảy ra cách đây khoảng 65 triệu nămCâu trả lời: Đáp án D Dịch đề: Một vài nhà khoa học cho rằng ảnh hưởng của một thiên thạch, mà xảy ra cách đây khoảng 65 triệu năm, có thể đã gây ra sự tuyệt chủng của loài khủng long. Cấu trúc dự đoán trong QK: may/could have been + VII Các đáp án A, B, C đều không chính xác vì làm thay đổi mức độ chính xác của dự đoán àchọn D Dịch: Theo quan điểm của một số nhà khoa học, sự tuyển chủng của loài khủng long có thể là kết quả của sự ảnh hưởng của một vụ thiên thạch xảy ra cách đây khoảng 65 triệu năm

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 fo...

LQ

Lê Quỳnh Anh

12 tháng 8 2017

Mark the letter a, B, C, or D on your answer sheet to indicate the sentence that is closest meaning to each of the following questions or indicate the correct answer to each of them from 1 to 7 It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species’ death vary from situation to situation. Rapid ecological change may render an...

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Mark the letter a, B, C, or D on your answer sheet to indicate the sentence that is closest meaning to each of the following questions or indicate the correct answer to each of them from 1 to 7

It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species’ death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For example, temperatures may change and a species may not be able to adapt. Food resources may be affected by environmental changes, which will then cause problems for a species requiring these resources. Other species may become better adapted to an environment, resulting in competition and, ultimately, in the death of a species.

The fossil record reveals that extinction has occurred throughout the history of Earth. Recent analyses have also revealed that on some occasions many species become extinct at the same time- a mass extinction. One of the best- known examples of mass extinction occurred 65 million years ago with the demise of dinosaurs and many other forms of life. Perhaps the largest mass extinction was the one that occurred 225 million years ago, when appropriately 95 percent of all species died. Mass extinction can be caused by a relatively rapid change in the environment and can be worsened by the close interrelationship of many species. If, for example, something were to happen to destroy much of the plankton in the oceans, then the oxygen content of Earth would drop, affection even organisms not living in the ocean. Such a change would probably lead to a mass extinction.

One interesting, and controversial, finding is that extinctions during the past 250 million years have tended to be more intense every 26 million years. This periodic extinction might be due to intersection of the Earth’s orbit with a cloud of comets, but this theory is purely speculative. Some researchers have also speculated that extinction may often be random. That is, certain species may be eliminated and others may survive for no particular reason. A species’ survival may have nothing to do with its ability to adapt. If so, some of evolutionary history may reflect a sequence of essentially random events.

The underlined word “demise” is closest in meaning to

A. help

B. change

C. death

D. recovery

#Mẫu giáo

1

DH

Dương Hoàn Anh

12 tháng 8 2017

Đáp án C

Đáp án C. demise (n) = death: cái chết.

Các đáp án còn lại:

A. help (n+v): giúp đỡ.

B. change (n+v): thay đổi.

D. recovery (n): sự khôi phục, sự phục hồi

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Lê Quỳnh Anh

6 tháng 9 2019

Mark the letter a, B, C, or D on your answer sheet to indicate the sentence that is closest meaning to each of the following questions or indicate the correct answer to each of them from 1 to 7 It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species’ death vary from situation to situation. Rapid ecological change may render an...

Đọc tiếp

Mark the letter a, B, C, or D on your answer sheet to indicate the sentence that is closest meaning to each of the following questions or indicate the correct answer to each of them from 1 to 7

It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species’ death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For example, temperatures may change and a species may not be able to adapt. Food resources may be affected by environmental changes, which will then cause problems for a species requiring these resources. Other species may become better adapted to an environment, resulting in competition and, ultimately, in the death of a species.

The fossil record reveals that extinction has occurred throughout the history of Earth. Recent analyses have also revealed that on some occasions many species become extinct at the same time- a mass extinction. One of the best- known examples of mass extinction occurred 65 million years ago with the demise of dinosaurs and many other forms of life. Perhaps the largest mass extinction was the one that occurred 225 million years ago, when appropriately 95 percent of all species died. Mass extinction can be caused by a relatively rapid change in the environment and can be worsened by the close interrelationship of many species. If, for example, something were to happen to destroy much of the plankton in the oceans, then the oxygen content of Earth would drop, affection even organisms not living in the ocean. Such a change would probably lead to a mass extinction.

One interesting, and controversial, finding is that extinctions during the past 250 million years have tended to be more intense every 26 million years. This periodic extinction might be due to intersection of the Earth’s orbit with a cloud of comets, but this theory is purely speculative. Some researchers have also speculated that extinction may often be random. That is, certain species may be eliminated and others may survive for no particular reason. A species’ survival may have nothing to do with its ability to adapt. If so, some of evolutionary history may reflect a sequence of essentially random events.

The underlined word “ultimately” is closest in meaning to

A. eventually

B. unfortunately

C. dramatically

D. exceptionally

#Mẫu giáo

1

DH

Dương Hoàn Anh

6 tháng 9 2019

Đáp án A

Đáp án A. ultimately = eventually: cuối cùng, rốt cục thì.

Các đáp án còn lại:

B. không may mắn.

C. đột ngột.

D. cá biệt, khác thường.

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Lê Quỳnh Anh

15 tháng 7 2019

Mark the letter a, B, C, or D on your answer sheet to indicate the sentence that is closest meaning to each of the following questions or indicate the correct answer to each of them from 1 to 7 It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species’ death vary from situation to situation. Rapid ecological change may render an...

Đọc tiếp

Mark the letter a, B, C, or D on your answer sheet to indicate the sentence that is closest meaning to each of the following questions or indicate the correct answer to each of them from 1 to 7

It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species’ death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For example, temperatures may change and a species may not be able to adapt. Food resources may be affected by environmental changes, which will then cause problems for a species requiring these resources. Other species may become better adapted to an environment, resulting in competition and, ultimately, in the death of a species.

The fossil record reveals that extinction has occurred throughout the history of Earth. Recent analyses have also revealed that on some occasions many species become extinct at the same time- a mass extinction. One of the best- known examples of mass extinction occurred 65 million years ago with the demise of dinosaurs and many other forms of life. Perhaps the largest mass extinction was the one that occurred 225 million years ago, when appropriately 95 percent of all species died. Mass extinction can be caused by a relatively rapid change in the environment and can be worsened by the close interrelationship of many species. If, for example, something were to happen to destroy much of the plankton in the oceans, then the oxygen content of Earth would drop, affection even organisms not living in the ocean. Such a change would probably lead to a mass extinction.

One interesting, and controversial, finding is that extinctions during the past 250 million years have tended to be more intense every 26 million years. This periodic extinction might be due to intersection of the Earth’s orbit with a cloud of comets, but this theory is purely speculative. Some researchers have also speculated that extinction may often be random. That is, certain species may be eliminated and others may survive for no particular reason. A species’ survival may have nothing to do with its ability to adapt. If so, some of evolutionary history may reflect a sequence of essentially random events.

According to paragraph 2, evidence from fossil suggests that

A. extinction of species has occurred from time to time throughout Earth’s history

B. dinosaurs became extinct much earlier than scientists originally believed

C. extinctions on Earth have generally been massive

D. there has been only one mass extinction in Earth’s history

#Mẫu giáo

1

DH

Dương Hoàn Anh

15 tháng 7 2019

Đáp án A

Theo đoạn 2, bằng chứng từ hóa thạch chỉ ra rằng:

A. Sự tuyệt chủng của các loài đã xảy ra liên tục trong suốt tiến trình lịch sử Trái Đất.

B. Khủng long đã tuyệt chủng sớm hơn nhiều so với các nhà khoa học tin rằng.

C. Sự tuyệt chủng trên trái đất nhìn chung là mang tính hàng loạt.

D. Chỉ có duy nhất 1 lần sự tuyệt chủng hàng loạt diễn ra trong lịch sử Trái Đất.

Dẫn chứng ở câu đầu tiên đoạn 2: “The fossil record reveals that extinction has occurred throughout the history of Earth”- ( Ghi nhận về hóa thạch tiết lộ rằng sự tuyệt chủng đã xảy ra trong suốt tiến trình lịch sử Trái Đất)

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Lê Quỳnh Anh

27 tháng 5 2018

Mark the letter a, B, C, or D on your answer sheet to indicate the sentence that is closest meaning to each of the following questions or indicate the correct answer to each of them from 1 to 7 It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species’ death vary from situation to situation. Rapid ecological change may render an...

Đọc tiếp

Mark the letter a, B, C, or D on your answer sheet to indicate the sentence that is closest meaning to each of the following questions or indicate the correct answer to each of them from 1 to 7

It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species’ death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For example, temperatures may change and a species may not be able to adapt. Food resources may be affected by environmental changes, which will then cause problems for a species requiring these resources. Other species may become better adapted to an environment, resulting in competition and, ultimately, in the death of a species.

The fossil record reveals that extinction has occurred throughout the history of Earth. Recent analyses have also revealed that on some occasions many species become extinct at the same time- a mass extinction. One of the best- known examples of mass extinction occurred 65 million years ago with the demise of dinosaurs and many other forms of life. Perhaps the largest mass extinction was the one that occurred 225 million years ago, when appropriately 95 percent of all species died. Mass extinction can be caused by a relatively rapid change in the environment and can be worsened by the close interrelationship of many species. If, for example, something were to happen to destroy much of the plankton in the oceans, then the oxygen content of Earth would drop, affection even organisms not living in the ocean. Such a change would probably lead to a mass extinction.

One interesting, and controversial, finding is that extinctions during the past 250 million years have tended to be more intense every 26 million years. This periodic extinction might be due to intersection of the Earth’s orbit with a cloud of comets, but this theory is purely speculative. Some researchers have also speculated that extinction may often be random. That is, certain species may be eliminated and others may survive for no particular reason. A species’ survival may have nothing to do with its ability to adapt. If so, some of evolutionary history may reflect a sequence of essentially random events.

Why is “plankton” mentioned in the second paragraph?

A. To demonstrate the interdependence of different species

B. To illustrate a comparison between organisms that live on the land and those that live in the ocean

C. To emphasize the importance of food resources in preventing mass extinction

D. To point out that certain species could never become extinct

#Mẫu giáo

1

DH

Dương Hoàn Anh

27 tháng 5 2018

Đáp án A

Tại sao sinh vật phù du được đề cập tới ở đoạn 2?

A. Để chứng minh sự phụ thuộc giữa các loài khác nhau.

B. Để minh họa cho sự so sánh giữa các sinh vật sống trên mặt đất và những sinh vật sống trong đại dương.

C. Để nhấn mạnh tầm quan trọng của nguồn thức ăn trong việc ngăn chặn sự tuyệt chủng hàng loạt.

D. Để chỉ ra rằng một số loài nhất định sẽ không bao giờ bị tuyệt chủng.

Dẫn chứng ở câu thứ 5+6 ở đoạn 2: “ Mass extinction can be caused by a relatively rapid change in the environment and can be worsened by the close interrelationship of many species. If, for example, something were to happen to destroy much of the plankton in the oceans, then the oxygen content of Earth would drop, affection even organisms not living in the ocean” – ( Sự tuyệt chủng hàng loạt bị gây ra bởi sự biến đổi môi trường nhanh chóng và có thể tồi tệ hơn là do mối tương quan mật thiết giữa các loài. Ví dụ như có điều gì đó xảy ra làm hủy diệt số lượng lớn các loài sinh vật phù dù trong đại dương, thì lượng ô-xi trên trái đất cũng từ đó mà giảm theo làm ảnh hưởng không chỉ tới các loài sinh vật đại dương).

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Lê Quỳnh Anh

18 tháng 2 2019

Mark the letter a, B, C, or D on your answer sheet to indicate the sentence that is closest meaning to each of the following questions or indicate the correct answer to each of them from 1 to 7 It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species’ death vary from situation to situation. Rapid ecological change may render an...

Đọc tiếp

Mark the letter a, B, C, or D on your answer sheet to indicate the sentence that is closest meaning to each of the following questions or indicate the correct answer to each of them from 1 to 7

It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species’ death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For example, temperatures may change and a species may not be able to adapt. Food resources may be affected by environmental changes, which will then cause problems for a species requiring these resources. Other species may become better adapted to an environment, resulting in competition and, ultimately, in the death of a species.

The fossil record reveals that extinction has occurred throughout the history of Earth. Recent analyses have also revealed that on some occasions many species become extinct at the same time- a mass extinction. One of the best- known examples of mass extinction occurred 65 million years ago with the demise of dinosaurs and many other forms of life. Perhaps the largest mass extinction was the one that occurred 225 million years ago, when appropriately 95 percent of all species died. Mass extinction can be caused by a relatively rapid change in the environment and can be worsened by the close interrelationship of many species. If, for example, something were to happen to destroy much of the plankton in the oceans, then the oxygen content of Earth would drop, affection even organisms not living in the ocean. Such a change would probably lead to a mass extinction.

One interesting, and controversial, finding is that extinctions during the past 250 million years have tended to be more intense every 26 million years. This periodic extinction might be due to intersection of the Earth’s orbit with a cloud of comets, but this theory is purely speculative. Some researchers have also speculated that extinction may often be random. That is, certain species may be eliminated and others may survive for no particular reason. A species’ survival may have nothing to do with its ability to adapt. If so, some of evolutionary history may reflect a sequence of essentially random events.

According to the passage, it is believed that the largest extinction of a species occurred

A. 250 million years ago

B. 225 million years ago

C. 65 million years ago

D. 26 million years ago

#Mẫu giáo

1

DH

Dương Hoàn Anh

18 tháng 2 2019

Đáp án D

Theo đoạn văn, người ta tin rằng sự tuyệt chủng lớn nhất của một loài xảy ra vào:

A. 250 triệu năm trước

B. 225 triệu năm trước

C. 65 triệu năm trước

D. 26 triệu năm trước.

Dẫn chứng ở câu thứ 4 đoạn 2: “Perhaps the largest mass extinction was the one that occurred 225 million years ago” – ( Sự tuyệt chủng lớn nhất của 1 loài có lẽ đã xảy ra vào 225 triệu năm trước).

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Lê Quỳnh Anh

23 tháng 2 2019

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.It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species’ death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For example,...

Đọc tiếp

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.

It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species’ death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For example, temperatures may change and a species may not be adapted. Food resources may be affected by environmental changes, which will then cause problems for a species requiring these resources. Other species may become better adapted to an environment, resulting in competition and, ultimately, in the death of a species.

The fossil record reveals that extinction has occurred throughout the history of Earth. Recent analyses have also revealed that on some occasions many species became extinct at the same time - a mass extinction. One of the best-known examples of mass extinction occurred 65 million years ago with the demise of dinosaurs and many other forms of life. Perhaps the largest mass extinction was the one that occurred 225 million years ago, when approximately 95 percent of all species died. Mass extinctions can be caused by a relatively rapid change in the environment and can be worsened by the close interrelationship of many species. If, for example, something were to happen to destroy much of the plankton in the oceans, then the oxygen content of Earth would drop, even affect organisms not living in the oceans. Such a change would probably lead to a mass extinction.

One interesting, and controversial, finding is that extinctions during the past 250 million years have tended to be more intense every 26 million years. The periodic extinction might be due to intersection of the earth’s orbit with a cloud of comets, but this theory is purely speculative. Some researchers have also speculated that extinction may often be random. That is, certain species may be eliminated and others may survive for no particular reason. A species’ survival may have nothing to do with its ability or inability to adapt. If so, some of revolutionary history may reflect a sequence of essentially random events.

Which of the following can be inferred from the theory of periodic extinction mentioned in paragraph 3?

A. The theory is no longer seriously considered.

B. evidence to support the theory has recently been found.

C. Most scientists believe the theory to be accurate.

D. Many scientists could be expected to disagree with it.

#Mẫu giáo

1

DH

Dương Hoàn Anh

23 tháng 2 2019

Đáp án : D

Đầu đoạn cuối: One interesting, and controversial finding is that extinctions during the past 250 million years have tended to be more intense every 26 million years. The periodic extinction… is purely speculative -> phát hiện gây tranh gãi rằng sự tuyệt chủng 250 triệu năm qua cứ 26 triệu năm một lần sẽ gay gắt hơn. Thuyết tuyệt chủng theo giai đoạn này chỉ là suy đoán ---> nhiều nhà khoa học không đồng ý

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Lê Quỳnh Anh

25 tháng 6 2017

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. It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species’ death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For...

Đọc tiếp

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.

It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species’ death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For example, temperatures may change and a species may not be able to adapt. Food Resources may be affected by environmental changes, which will then cause problems for a species requiring these resources. Other species may become better adapted to an environment, resulting in competition and, ultimately, in the death of a species.

The fossil record reveals that extinction has occurred throughout the history of Earth. Recent analyses have also revealed that on some occasions many species became extinct at the same time – a mass extinction. One of the best-known examples of mass extinction occurred 65 million years ago with the demise of dinosaurs and many other forms of life. Perhaps the largest mass extinction was the one that occurred 225 million years ago. When approximately 95 percent of all species died, mass extinctions can be caused by a relatively rapid change in the environment and can be worsened by the close interrelationship of many species. If, for example, something were to happen to destroy much of the plankton in the oceans, then the oxygen content of Earth would drop, affection even organisms not living in the oceans. Such a change would probably lead to a mass extinction.

One interesting, and controversial, finding is that extinctions during the past 250 million years have tended to be more intense every 26 million years. This periodic extinction might be due to intersection of the Earth’s orbit with a cloud of comets, but this theory is purely speculative. Some researchers have also speculated that extinction may often be random. That is, certain species may be eliminated and others may survive for no particular reason. A species’ survival may have nothing to do with its ability or inability to adapt. If so, some of evolutionary history may reflect a sequence of essentially random events

Which of the following can be inferred from the theory of periodic extinction mentioned in paragraph 3?

A. Many scientists could be expected to disagree with it

B. Evidence to support the theory has recently been found

C. The theory is no longer seriously considered

D. Most scientists believe the theory to be accurate

#Mẫu giáo

1

DH

Dương Hoàn Anh

25 tháng 6 2017

Đáp án A

Từ học thuyết tuyệt chủng chu kì đuộc đề cập ở đoạn 3, có thể suy ra điều gì?

A. rất nhiều nhà khoa học có thể phản đối nó

B. hầu hết các nhà khoa học tin học thuyết này là đúng

C. học thuyết này không còn được xem xét một cách nghiêm túc nữa

D. bằng chứng để ủng hộ học thuyết này đã được tìm ra

Giải thích: Thông tin nằm ở “This periodic extinction might be due to intersection of the Earth’s orbit with a cloud of comets, but this theory is purely speculative”. Vì nó hoàn toàn là suy đoán nên ta có thể suy đoán rằng nó bị nhiều nhà khoa học khác phản đối

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Lê Quỳnh Anh

24 tháng 2 2017

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 34. It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species' death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For...

Đọc tiếp

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 34.

It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a changed environment, it may perish. The exact causes of a species' death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For example, temperatures may change and a species may not be able to adapt. Food Resources may be affected by environmental changes, which will then cause problems for a species requiring these resources. Other species may become better adapted to an environment, resulting in competition and, ultimately, in the death of a species.

The fossil record reveals that extinction has occurred throughout the history of Earth. Recent analyses have also revealed that on some occasions many species became extinct at the same time - a mass extinction. One of the best-known examples of mass extinction occurred 65 million years ago with the demise of dinosaurs and many other forms of life. Perhaps the largest mass extinction was the one that occurred 225 million years ago. When approximately 95 percent of all species died, mass extinctions can be caused by a relatively rapid change in the environment and can be worsened by the close interrelationship of many species. If, for example, something were to happen to destroy much of the plankton in the oceans, then the oxygen content of Earth would drop, affection even organisms not living in the oceans. Such a change would probably lead to a mass extinction.

One interesting, and controversial, finding is that extinctions during the past 250 million years have tended to be more intense every 26 million years. This periodic extinction might be due to intersection of the Earth’s orbit with a cloud of comets, but this theory is purely speculative. Some researchers have also speculated that extinction may often be random. That is, certain species may be eliminated and others may survive for no particular reason. A species’ survival may have nothing to do with its ability or inability to adapt. If so, some of evolutionary history may reflect a sequence of essentially random events.

Which of the following can be inferred from the theory of periodic extinction mentioned in paragraph 3?

A. Many scientists could be expected to disagree with it

B. Evidence to support the theory has recently been found.

C. The theory is no longer seriously considered.

D. Most scientists believe the theory to be accurate.

#Mẫu giáo

1

DH

Dương Hoàn Anh

24 tháng 2 2017

Chọn A

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Lê Quỳnh Anh

27 tháng 3 2018

Read the followingpassage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer for each of the question.It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a change environment, _it may perish. The exact causes of a species’ death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For example, temperatures...

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Read the followingpassage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer for each of the question.

It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a change environment, _it may perish. The exact causes of a species’ death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For example, temperatures may change and a species may not be adapt. Food resources may be affected by environmental changes, which will then cause problems for a species requiring these resources. Other species may become better adapted to an environment, resulting in competition and, ultimately, in the death of a species.

The fossil record reveals that extinction has occurred throughout the history of Earth. Recent analyses have also revealed that on some occasions many species became extinct at the same time - a mass extinction. One of the best - known examples of mass extinction occurred 65 million years ago with the demise of dinosaurs and many other forms of life. Perhaps the largest mass extinction was the one that occurred 225 million years ago, when approximately 95 percent of all species died. Mass extinctions can be caused by a relatively rapid change in the environment and can be worsened by the close interrelationship of many species. If, for example, something were to happen to destroy much of the plankton in the oceans, then the oxygen content of Earth would drop, affection even organisms not living in the oceans. Such a change would probably lead to a mass extinction.

One interesting, and controversial, finding is that extinctions during the past 250 million years have tended to be more intense every 26 million years. The periodic extinction might be due to intersection of the earth’s orbit with a cloud of comets, but this theory is purely speculative. Some researchers have also speculated that extinction may often be random. That is, certain species may be eliminated and others may survive for no particular reason. A species’ survival may have nothing to do with its ability or inability to adapt. If so, some of revolutionary history may reflect a sequence of essentially random events.

Which of the following can be inferred from the theory of periodic extinction mentioned in paragraph 3?

A. Many scientists could be expected to disagree with it

B. evidence to support the theory has recently been found.

C. The theory is no longer seriously considered.

D. Most scientists believe the theory to be accurate.

#Mẫu giáo

1

DH

Dương Hoàn Anh

27 tháng 3 2018

Đáp án là A. Ý trong bài: The periodic extinction might be due to intersection of the earth’s orbit with a cloud of comets, but this theory is purely speculative (hoàn toàn suy đoán).

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