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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

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