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.
【C9】
选项 A、when
B、since
C、for
D、whereas
答案D
解析 逻辑衔接题。结合选项可知，所填关联词表明横线前后两部分的逻辑关系。横线前部分说“一些人发现他们能分辨出一种花香而分辨不出另外一种花香”，横线后部分则说“另一些人对两种花香都很敏感”，可见两部分之间为转折对比关系，whereas“然而，但是，尽管”符合此处的逻辑关系，故为答案。when(当……时候)表示时间或两件事同时发生。since(自……以来；因为，由于)，既表示时间，也表示原因，for(因为)表示原因，这三项均不能使本句逻辑通顺，故均排除。
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