2005考研英语一真题及答案

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2005 考研英语一真题及答案

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.

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] dispersed

[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

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