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 the 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.