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The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals,【C1】______this i
The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals,【C1】______this i
admin
2012-08-24
36
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 messages to the brain. However, it has been found that even people insensitive to a certain smell【C11】______can suddenly become sensitive to it when exposed to it often enough.
The explanation for insensitivity to smell seems to be that the brain finds it【C12】______to keep all smell receptors working all the time but can create new receptors if necessary. This may 【C13】______explain why we are not usually sensitive to our own smells—we simply do not need to be. We are not【C14】______of the usual smell of our own house, but we notice new smells when we visit someone else’s. The brain finds it best to keep smell receptors【C15】______for unfamiliar and emergency signals such as the smell of smoke, which might indicate the danger of fire.
【C13】
选项
A、still
B、Also
C、otherwise
D、nevertheless
答案
B
解析
句意“这……可以解释为什么我们通常对自己的气味不敏感——我们根本不需要(对自己的气味敏感)。”选项A.still仍然;B.also也;C.otherwise否则;D.nevertheless然而,虽然如此。“this”这个词就表明了逻辑关系应该是并列,翻译成“也”,表示和前面的句子是相同或者相近的含义。故答案为B。
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在职申硕(同等学力)英语
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