2. 考研
  3. 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

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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.
【C19】
选项 A、available
B、reliable
C、identifiable
D、suitable
答案A
解析 语义衔接题。横线所在句说的是大脑认为最适合的工作方式：最好是让气味感应器为陌生紧急信号保持______。上句阐述了人类的嗅觉特点：察觉不到自己家中惯有的气味，却能注意到别人家不熟悉的气味。可见，大脑是让这些气味感应器保持随时能够感应到陌生或紧急气味的，available表示“让感应器随时用于接收陌生紧急信号”，符合语义，故为答案。available for unfamiliar signals对应上句的notice new smells。reliable(可靠的，可信赖的)，identifiable(可识别的)和suitable(适合的)代入句中，“使这些感应器对陌生紧急气味来说是可靠的／可识别的／合适的”均说不通，故排除。
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