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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
42
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.
【C12】
选项
A、at first
B、at all
C、at large
D、at times
答案
A
解析
语义衔接题。横线所在句前后为时间顺接或条件关系。at first意为“开始,起初”,符合句意,故为答案。at all((用于否定句)丝毫(不),一点也不)和at large(详尽地,充分地;一般来说)不符合此处语境,故均排除。at times(有时,偶尔)也表时间,为强干扰项,但“对……敏感/不敏感”是一种持续性的状态,而不是一种间歇性的动作,故排除。
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