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The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals, 【C1】______ this
The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals, 【C1】______ this
admin
2017-11-28
27
问题
The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals, 【C1】______ this is largely because,【C2】______animals, we stand upright. This means that our noses are【C3】______ to perceiving those smells which float through the air, 【C4】______the majority of smells which stick to surfaces. In fact, 【C5】______, we are extremely sensitive to smells, 【C6】______ we do not generally realize it. Our noses are capable of【C7】______human smells even when these are【C8】______ to far below one part in one million.
Strangely, some people find that they can smell one type of flower but not another,【C9】______others are sensitive to the smells of both flowers. This may be because some people do not have the genes necessary to generate【C10】______smell receptors in the nose. These receptors are the cells which sense smells and send【C11】______ to the brain. However, it has been found that even people insensitive to a certain smell【C12】______can suddenly become sensitive to it when【C13】______ to it often enough.
The explanation for insensitivity to smell seems to be that brain finds it【C14】______to keep all smell receptors working all the time but can【C15】______new receptors if necessary. This may 【C16】______explain why we are not usually sensitive to our own smells we simply do not need to be. We are not【C17】______of the usual smell of our own house but we【C18】______ new smells when we visit someone else’s. The brain finds it best to keep smell receptors【C19】______for unfamiliar and emergency signals【C20】______the smell of smoke, which might indicate the danger of fire.
【C14】
选项
A、ineffective
B、incompetent
C、inefficient
D、insufficient
答案
C
解析
语义衔接题。四个选项均表示“不足的,不够的”,而能用来形容to keep…all the time (让所有的气味感应器持续工作)这一工作部署的特点且符合本句语义的只有inefficient(效率低的)。此处是说“大脑发现让所有的气味感应器持续工作效率很低”,暗含大脑并没有让所有的气味感应器都持续工作的意思,导致对有些气味不敏感,恰好成为“对气味不敏感”的解释,句子逻辑合理,可见答案为[C]项。ineffective为强干扰项,也能使本句句意通顺,但上段明确提到“气味感应器能够感知气味并向大脑传递信息”,而此处说“所有气味感应器持续工作没有效果”,明显不合逻辑,故排除。incompetent(无能的,不胜任的)一般用来修饰人,故排除。insufficient相当于not enough,表示量的不充足,与此处不定式结构语义不匹配,故排除。
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