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.
【C1】
选项 A、although
B、as
C、but
D、while
答案C
解析 逻辑衔接题。横线前说的是一种普遍看法(are often thought to be)：人类嗅觉不如动物灵敏(insensitive smellers)，横线后作者解释原因：这主要是因为我们是直立着的(we stand upright)。可见，横线前后为转折关系，且this is largely because， ______ animals，we stand uptight为语句重点所在，故答案为but。如果横线处填入although或while，横线所在部分为让步状语从句，下一句的this指代主句Humans are…with animals，而主句与that从句内容上不对应，无法用means连接，故排除although和while。as表示原因，但横线所在部分已经有了明确表示原因的because，无需再用as，故也排除。
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