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               
【C9】
选项
答案N
解析 空格前是名词短语tooth pain，空格后是介词短语by heat or cold，而tooth pain ________by heat or cold是complain of的宾语。由此可知，空格处应填入动词的-ed形式作pain的后置定语。空格所在句的意思是：牙齿敏感的人可能会抱怨诸如由热或冷________牙痛。由常识可知，对牙齿敏感的人来说，太热或太冷的东西容易“引起”牙痛，因此本空应填入含有“引起”意义的动词-ed形式，由此确定答案为N)triggered。备选的动词-ed形式中，B)associated不符合此处语境，而且通常与with连用，因此排除。
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大学英语四级

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