2. 外语
  3. Man is the only animal that laughs. Why is this true? What makes us respond as we do to pleasurable experiences? What is the his

Man is the only animal that laughs. Why is this true? What makes us respond as we do to pleasurable experiences? What is the his

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问题     Man is the only animal that laughs. Why is this true? What makes us respond as we do to pleasurable experiences? What is the history of this "happy【C1】______" , as someone once termed it, and just what is its function?
    We are not short of theories to explain the mystery; for centuries, biologists, philosophers, psychologists, and medical men have sought a definitive explanation of laughter. One writer【C2】______that its function is to【C3】______others or to prove to be better than them by insulting them. Another took the opposite view: that we laugh in order not to cry. A psychologist offered the explanation that laughter functions as【C4】______for painful experiences, and that it serves to defend a person against what the psychologist termed "the many minor pains to which man is【C5】______". In the 17th century a writer set forth the theory that we laugh when we compare ourselves with others and find ourselves superior;【C6】______, we laugh at the weakness of others.
    Virtually every theory has been concerned with either the structure or the function of laughter, whereas relatively few have been devoted to the question of its【C7】______. I propose to offer a theory which, so far as I am aware, has not previously been set forth; that only those animals capable of【C8】______are capable of laughter; and that therefore man, being the only animal that speaks, is the only animal that laughs.
    Those of us who have observed chimpanzees closely feel quite confident that the chimpanzee occasionally exhibits behavior that looks very much like a primitive human laughter. This behavior, however, has been observed only in a human context;【C9】______it occurs under natural conditions is dubious; but【C10】______that under any conditions an ape is capable of such behavior is of more than passing interest—for does it not indicate that early man had the basics of laughter?
【C10】
选项 A、a fact
B、the very fact
C、an interesting fact
D、the exact fact
答案B
解析 考查语法结构。本题空格所在的从句是同位语从句，而同位语从句前的先行词(此题中先行词为“fact”)多用定冠词修饰，故首先排除C．an interesting fact。另外，在同位语从句中，如若强调先行词，在先行词前加形容词“very”，故排除D．the exact fact。A．the fact和B．the very fact皆符合语法和语义，区别仅在于后者表示强调。从文中可以看出作者十分注重这一事实，将此事实作为探究“笑”的起源的依据。故选B。
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