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               
【C2】
选项
答案G
解析 空格前有形容词性物主代词our，后面是名词discomfort，因此本空应填入形容词或名词。空格所在句的意思是：尽管我们的________不舒服，事实证明我们的牙齿如此敏感是有原因的。由our teeth are so sensitive可知，discomfort指的是“牙齿”不舒服，因此本空应填入含有“牙齿”意义的形容词或名词，由此确定答案为G)dental。
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大学英语四级

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