Câu hỏi:

05/04/2020 3,065 Lưu

Read the following passage and mark the letter A,B,C or D on your answers sheet to indicate the correct answer to each of the questions.

Generally, in order to be preserved in the fossil record, organisms must possess hard body parts such as shells or bones. Soft, fleshy structures are quickly destroyed by predators or decayed by bacteria. Even hard parts left on the surface for any length of time will be destroyed, therefore, organisms must be buried rapidly to escape destruction by the elements and to be protected against agents of weathering and erosion. Marine organisms thus are better candidates for fossilization than those living on the land because the ocean is typical the site of sedimentation, whereas the land is largely the site of erosion.

The beds of ancient lakes were also excellent sites for rapid burial of skeletal remains of freshwater organisms and skeletons of other animals, including those of early humans, Ancient swaps were particularly plentiful with prolific growths of vegetation, which fossilized in abundance. Many animals became trapped in bogs overgrown by vegetation. The environment of the swaps kept bacterial decay to a minimum, which greatly aided in the preservation of plants and animals. The rapidly accumulating sediments in flood plains, deltas, and stream channels buried freshwater organisms, along with other plants and animals that happened to fall into the water.

Only a small traction of all the organisms that have ever lived are preserved as fossils. Normally, the remains of a plant or animal are completely destroyed through predation and decay. Although it seems that fossilization is common for some organisms, for others it is almost impossible. For the most part of, the remains of organisms are recycled in the earth, which is fortunate because otherwise soil and water would soon became depleted of essential nutrients. Also, most of the fossils exposed on Earth’s surface are destroyed by weathering processes. This make for an incomplete fossil record with poor or no representation of certain species. The best fossils are those composed of that form the vast majority of unaltered fossils. Calcite and aragonite also contributed to a substantial number of fossils of certain organisms.

According to the passage, why were the remains of organisms trapped in swamps better preserved for the fossil record than those that were not?

A.  The swamp environment reduced the amount of bacterial decay

B. Swamp waters contained higher amounts of materials such as calcium carbonate.

C. There were fewer sediments in swamps than in other bodies of water

D. Swamp vegetation accelerated the decomposition of organisms

Quảng cáo

Trả lời:

verified Giải bởi Vietjack

Đáp án là A.

Ý trong bài: The environment of the swaps kept bacterial decay to a minimum.

CÂU HỎI HOT CÙNG CHỦ ĐỀ

Câu 1

A . I am strong advise that you should take part in volunteer works

B. I strongly advise that you might take part for volunteer works

C. I strongly advise that you should take part in volunteer works

D.  I am strong in advising you to take part in volunteer works

Lời giải

Đáp án là C.

A loại vì tính từ “strong” và động từ “advise” không thể đi liền nhau được.

D loại, vì không có cấu trúc: be strong in V-ing

B cũng loại vì “advise - khuyên” => mệnh đề that nên dùng “should” thay cho “might”

Lời giải

Đáp án là C.

Catch a view of someone: bắt được ánh nhìn của ai => được ai chú ý đến

Câu 3

A. right now, Mary is having a holiday in Vermont , so it is impossible that it was she whose shouting you heard last night.

B. I think that Mary is on holiday in Vermont now, so you may be wrong in thinking that you heard her yelling last night

C. if it was Mary that you heard yelling last night, then she can’t be taking a vacation in Vermont at the moment

D. are you sure is was Mary who shouted to you last night, because , as far I know , she is on vacation in Vermont at the moment

Lời giải

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Lời giải

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Câu 5

A. we listened to the old man saying his story from beginning to end

B. we listened the old man say his story from the beginning to the end

C. we listened to the old man say his story from beginning to end

D.  we listened to the old man to say his story from beginning to end

Lời giải

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Lời giải

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Lời giải

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