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.

  The explanation for insensitivity to smell seems to be that brain finds it

  14   to keep all smell receptors working all the time but can   15   new receptors if necessary. This may   16   explain why we are not usually sensitive to our own smells we simply do not need to be. We are not   17   of the usual smell of our own house but we   18   new smells when we visit someone else's. The brain finds it best to keep smell receptors   19   for unfamiliar and emergency signals   20   the smell of smoke, which might indicate the danger of fire.

1.  ［A］although      ［B］as           ［C］but&nb

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