2. 外语
  3. You might think of your teeth as tools, like built-in knives and forks, but if they are mere tools, why do they feel pain and wo

You might think of your teeth as tools, like built-in knives and forks, but if they are mere tools, why do they feel pain and wo

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问题     You might think of your teeth as tools, like built-in knives and forks, but if they are mere tools, why do they feel pain and wouldn’t it be better if they could just【C1】________under any condition? In spite of our【C2】________discomfort, it turns out there’s a good reason our teeth are so sensitive. Tooth pain is a【C3】________mechanism that ensures when a tooth is being damaged we’ll notice and do something about it.
    If we eat something too hot or too cold, or if the tooth is worn down enough where the tissue【C4】________is exposed, all of those things cause pain, and then the pain causes the person not to use that tooth to try to protect it a little bit more. So it’s really a protective mechanism more than anything else. If teeth didn’t feel pain, we might【C5】________to use them in situations that damage them, and for humans, damaging【C6】________teeth is a problem because, unlike crocodiles, we can’t【C7】________     them.
    Teeth have three layers, only one of which—the innermost layer of the tooth—can hurt, as that layer of the tooth【C8】________both blood vessels and nerves. Pain is the only feeling to which the nerves in that layer respond. Whereas people with tooth sensitivity may complain, for example, of tooth pain【C9】________by heat or cold, the nerves in the inner layer don’t sense temperature.  Rather, they feel pain, which may be【C10】________with, say, drinking something very cold.
    A)  adult                    I) emotional
    B)  associated               J) implies
    C)  chew                     K) mammal
    D)  contains                 L) replace
    E)  continue                 M) swallow
    F)   defense                 N) triggered
    G)  dental                   O) underneath
    H)  downward               
【C7】
选项
答案L
解析 空格前是情态动词can’t，因此本空应填入动词原形。空格所在句的意思是：对人类来说，损害成熟的牙齿是一个问题，因为我们不能像鳄鱼那样________它们。由常识可知，损坏成熟的牙齿是一个问题，因为人类无法自然“替换”成熟的牙齿，因此本空应填入含有“替换”意义的动词原形，由此确定答案为L)replace。
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大学英语四级

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