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44. Having two eyes instead of one is particularly useful for   .

  A. seeing at night                   B. seeing objects far away

  C. looking over a wide area           D. judging distances

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43. The underlined word blurry in the second paragraph probably means   .

  A. obvious     B. possible   C. clear         D. unclear

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42.When things far away seem indistinct(模糊不清) , one is probably   .

  A. near-sighted   B. far-sighted  C. astigmatic      D. suffering from cataracts

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41. We should take good care of our eyes   .

   A. only when we can see well

  B. only when we cannot see perfectly

  C. even if we can see well

  D. only when we realize how important our eyes are

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29. A. possibility         B. feasibility             C. hope                 D. result

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28. A. every             B. no                   C. this                  D. another

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27. A. simple            B. easy                 C. necessary            D. difficult

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26. A. prepare           B. regret                C. decline               D. expect

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25. A. offer              B. hesitate              C. refuse                D. mean

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