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发布时间：2006-06-21 20:59     点击：

20. What does the passage mainly discuss?

(A)The analysis of footprint fossils

(B)Accurate dating of hominid remains

(C) the career of Mary Leakey

(D)Behavioral patterns of early humans

21. The word "remarkable" in line 2 is closest in meaning to

(A) extraordinary

(B) enormous

(C) various

(D) orderly

22.The age of the Laetoli footprints was estimated by

(A) testing the fossilized bones of the hominids

(B) studying the shape of the footprints

(C) analyzing nearly rock layers

(D) comparison with footprints from other locations

23.It can be inferred that the footprints in volcanic ash at Laetoli were well preserved because

(A) they were buried by a second volcanic eruption

(B) the ash contained potassium anti argon

(C) the ash was still warm from the volcanic cruptions

(D) suitable conditions caused the ash 10 harden

24. Which or the following is NOT mentioned as a characteristic of the feet in Mary Leakey's fossil find?

(A)The shape or the heel

(B)The number of toes

(C)A raised arch

(D) A pronounced ball

25. The word "exerted" in line 11 is closest in meaning to

(A) influenced

(B) applied

(C) returned

(D) lessened

26. The figure of 87 centimeters mentioned in line 1 2 refers to the size of the

(A) objects carried by the hominids

(B) steps taken by the hominids

(C) hominids bodies

(D) hominids feet

27. Why does the author mention the "heel impression" in line 19?

(A) To emphasize the size of the hominids foot

(B) To speculate on a possible injury the hominid had suffered

(C) To give an example of similarity to modern human footprints

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