2. 外语
  3. Man is the only animal that laughs. Why is this true? What makes us respond as we【C1】______ to pleasurable experiences? What is

Man is the only animal that laughs. Why is this true? What makes us respond as we【C1】______ to pleasurable experiences? What is

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问题      Man is the only animal that laughs. Why is this true? What makes us respond as we【C1】______  to pleasurable experiences? What is the history of this "happy convulsion", as someone once【C2】______  it, and just what is its function?
     We are not short【C3】______ theories to explain the mystery; for centuries, biologists, psychologists, and medical men have【C4】______  a definitive explanation of laughter. One writer theoried that its function is to intimidate others or to gain stature【C5】______  them by humiliating them. Another took the opposite view that we laugh in order not to cry. A psychologist offered the explanation that laughter functions as a remedy【C6】______  painful experiences, and that it serves to defend a person【C7】______ what the psychologist termed "the many minor pains【C8】______  which man is exposed". In the seventeenth century, a writer set【C9】______  the theory that we laugh when we compare ourselves with others and find ourselves superior; in effect, we laugh at the infirmities of others.【C10】______  every theory bas been concerned with either the structure or the function of laughter,【C11】______   relatively few have been devoted 【C12】______  the question of its origin. I propose to offer a theory which, so far as I am 【C13】______ , has not previously been set forth: that only those animals capable of speech are capable of laughter; and that therefore man, being the only animal that【C14】______  , is the only animal that laughs.
     Those of us who have observed chimpanzees closely feel quite confident that the chimpanzee occasionally【C15】______  behavior that looks very much like a primitive precursor of human laughter. This behavior, however, has been observed only in a human【C16】______  ; whether or not it occurs under natural【C17】______  is dubious; but the 【C18】______  fact that under any condition an ape is capable of such behavior is【C19】______  more than passing【C20】______ for does it not indicate that early man had the rudiments of laughter?
【C1】
选项 A、arc
B、did
C、do
D、would
答案C
解析 此题考查助动词用法。在这里do代替的是前文提到的实义动词respond。用did时态不对。
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