2005年全国硕士研究生入学统一考试英语试题

　　2005年全国硕士研究生入学统一考试英语试题

　　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(C)

　　[D] while

　　2. [A] above

　　[B] unlike

　　[C] excluding(B)

　　[D] besides

　　3. [A] limited

　　[B] committed

　　[C] dedicated(A)

　　[D] confined

　　4. [A] catching

　　[B] ignoring

　　[C] missing(C)

　　[D] tracking

　　5. [A] anyway

　　[B] though

　　[C] instead(B)

　　[D] therefore

　　6. [A] even if

　　[B] if only

　　[C] only if(A)

　　[D] as if

　　7. [A] distinguishing

　　[B] discovering

　　[C] determining(D)

　　[D] detecting

　　8. [A] diluted

　　[B] dissolved

　　[C] determining(A)

　　[D] diffused

　　9. [A] when

　　[B] since

　　[C] for(D)

　　[D] whereas

　　10. [A] unusual

　　[B] particular

　　[C] unique(B)

　　[D] typical

　　11. [A] signs

　　[B] stimuli

　　[C] messages(C)

　　[D] impulses

　　12. [A] at first

　　[B] at all

　　[C] at large(A)

　　[D] at times

　　13. [A] subjected

　　[B] left

　　[C] drawn(D)

　　[D] exposed

　　14. [A] ineffective

　　[B] incompetent

　　[C] inefficient(C)

　　[D] insufficient

　　15. [A] introduce

　　[B] summon

　　[C] trigger(D)

　　[D] create