2005年全國碩士研究生入學(xué)統(tǒng)一考試英語試題

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

[D] while

2.    [A] above

[B] unlike

[C] excluding

[D] besides

3.    [A] limited

[B] committed

[C] dedicated

[D] confined

4.    [A] catching

[B] ignoring

[C] missing

[D] tracking

5.    [A] anyway

[B] though

[C] instead

[D] therefore

6.    [A] even if

[B] if only

[C] only if

[D] as if

7.    [A] distinguishing

[B] discovering

[C] determining

[D] detecting

8.    [A] diluted

[B] dissolved

[C] determining

[D] diffused

9.    [A] when

[B] since

[C] for

[D] whereas

10.   [A] unusual

[B] particular

[C] unique

[D] typical

11.   [A] signs

[B] stimuli

[C] messages

[D] impulses

12.   [A] at first

[B] at all

[C] at large

[D] at times

13.   [A] subjected

[B] left

[C] drawn

[D] exposed

14.   [A] ineffective

[B] incompetent

[C] inefficient

[D] insufficient

15.   [A] introduce

[B] summon

[C] trigger

[D] create

16.

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