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               
【C8】
选项
答案D
解析 空格前是句子的主语that layer of the tooth，空格后是宾语both blood vessels and nerves，因此空格处应填入动词的第三人称单数形式作谓语。空格所在句的意思是：牙齿包括三层，只有其中一层——牙齿最内层——会感到疼痛．因为牙齿那一层________血管和神经。由常识可知，牙齿会感到疼痛是因为“含有”神经，因此本空应填入含有“包含，含有”意义的动词，由此确定答案为D)contains。
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大学英语四级

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