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发布时间：2006-06-21 21:07     点击：

21. What does the passage mainly discuss?

(a) limits of the human eye

(b) perfect vision

(c) different eyes for different uses

(d) eye variation among different species

22. The word “criterion” in line 1 is closest in meaning to

(a) standard

(b) need

(c) expectation

(d) rule

23. The phrase “without a hitch” in line 2 is closest in meaning to

(a) unaided

(b) without glasses

(c) with little hesitation

(d) easily

24. According to the passage, why might birds and animals consider humans very visually handicapped?

(a) humans can’t see very well in either air or water

(b) human eyes are not as well suited to our needs

(c) the main outstanding feature of human eyes is color vision

(d) human eyes can’t do what their eyes can do

25. The word “that” in line 10 refers to

(a) foveae

(b) areas of the eye

(c) cones

(d) visual distinctions

26. According to the passage, “bug detectors” are useful for

(a) navigation

(b) seeing moving objects

(c) avoiding bugs when getting food

(d) avoiding starvation

27. According to the passage, which of the following is NOT true

(a) kingfishers have monocular vision

(b) bees see patterns of dots

(c) hawks eyes consist mostly of cones that can allow it to scan with one eye at a time

(d) humans are farsighted in water

28. Where in the passage does the author discuss that eyes are useful for avoiding starvation?

(a) lines 5-9

(b) lines 10-14

(c) lines 15-19

(d) lines 20-25

29. The phrase “paling into insignificance” in line 23 is closest in meaning to

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