托福考试2017阅读模拟冲刺题（二十一）_第2页

　　5. 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.

　　6. The word "aided" in line 13 is closest in meaning to

　　(A) reversed

　　(B) helped

　　(C) reformed

　　(D) counted

　　7. It can be inferred that flood plains, deltas, and stream channels (lines 14 - 15) are similar in which of the following ways?

　　(A) Animals rather than plants have been preserved at such locations.

　　(B) Such locations are likely to be rich sources of fossils.

　　(C) Fossilized human remains are only rarely found in such locations.

　　(D) Rapid sedimentation in such locations makes it difficult to locate fossils.

　　8. What is the author's main point in paragraph 3?

　　(A) Weathering makes it impossible to identify many fossils.

　　(B) Many fossils have been buried forever under the soil.

　　(C) Fossils provide a limited sample of ancient organisms.

　　(D) It is easier to find the remains of plants than animals.

　　9. Why does the author mention "aragonite" in line 27

　　(A) To explain why fossils are rare

　　(B) To compare aragonite fossils and calcite fossils

　　(C) To argue that certain fossils are more informative than others

　　(D) To illustrate the kinds of inorganic hard parts that can form fossils

　　参考答案：CADAD ACBD