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  3. The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals, but this is lar

The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals, but this is lar

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问题     The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals, but this is largely because,【C1】______animals, we stand upright. This means that our noses are【C2】______to perceiving those smells which float through the air, missing the majority of smells which stick to surfaces. In fact, though, we are extremely sensitive to smells, even if we do not generally realize it. Our noses are capable of 【C3】______human smells even when these are【C4】______to far below one part in one million.
    Strangely, some people find that they can smell one type of flower but not another, whereas others are sensitive to the smells of both flowers. This may be because some people do not have the genes necessary to generate【C5】______smell receptors in the nose. These receptors are the cells which sense smells and send【C6】______to the brain. However, it has been found that even people insensitive to a certain smell at first can suddenly become sensitive to it when【C7】______to it often enough.
    The explanation for insensitivity to smell seems to be that brain finds it inefficient to keep all smell receptors working all the time but can【C8】______new receptors if necessary. This may also explain why we are not usually sensitive to our own smells we simply do not need to be. We are not【C9】______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【C10】______for unfamiliar and emergency signals such as the smell of smoke, which might indicate the danger of fire.
【C2】
选项 A、limited
B、committed
C、dedicated
D、confined
答案A
解析 第三句话对第二句话的意思进行说明，指出“人的鼻子局限于某些嗅觉——飘浮于空中的嗅觉”，那么第三空选limited比较合适。confined与limited两者均有“局限，限制”的意思，但含义上略有不同。limit一般指在实践、空间、数量、质量或产量等方面有一个范围或限度，属于中型。而confined则有束缚、羁绊、限制自由或禁闭的隐含意思，它带有一种强制性，因此confined放在句子中与其明显不符，过于强硬和绝对。所以选A。
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