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2005年全国硕士研究生入学考试英语试题及答案

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Section Ⅰ Use of English

Directions:

Read the following text. Choose the best word(s) for each numbered blank and mark A,B,C or D on ANSWER SHEET 1(10 points)

  The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals,   1   this is largely because,  2   animals ,we stand upright. This means that our noses are   3   to perceiving those smells which float through the air,   4   the majority of smells which stick to surfaces. In fact

  5  , we are extremely sensitive to smells,   6   we do not generally realize it. Our noses are capable of   7   human smells even when these are   8   to far below one part in one million.

  Strangely, some people find that they can smell one type of flower but not another,   9   others are sensitive to the smells of both flowers. This may be because some people do not have the genes necessary to generate   10    smell receptors in the nose. These receptors are the cells which sense smells and send   11   to the brain. However, it has been found that even people insensitive to a certain smell   12   can suddenly become sensitive to it when   13   to it often enough.

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