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.
【C20】
选项 A、similar to
B、such as
C、along with
D、aside from
答案B
解析 语义衔接题。结合选项可知，所填短语表明the smell of smoke…(预示着火灾的烟味)与空前unfamiliar and emergency signals(陌生紧急信号)之间的关系。根据常识可知，预示着火灾的烟味是紧急信号的一种，可见the smell of smoke…是对unfamiliar and emergency signals的举例，such as(例如)表示例证，符合二者之间的关系，故为答案。similar to(和……相似，类似)表示类比，along with(和……一起)表示并列，aside from(除……以外)表示包含，均不符合二者之间的关系，故排除。
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