2. 外语
  3. In the 17th century, a writer explained the theory about the function of laughter supported by most people. According to the au

In the 17th century, a writer explained the theory about the function of laughter supported by most people. According to the au

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问题 In the 17th century, a writer explained the theory about the function of laughter supported by most people.
According to the author, the development of laughter is based on ______.
选项
答案the development of speech
解析 最后一段第1句：The development of speech undeniably is an indispensable factor in the development of man’s  capacity to think and establish a mastery of his environment；it was also, I theorize，the basic condition in the development of laughter．空白处需要名词性成分。题目把原文第2个分句中的主动语态换成了被动语态，所以答案为主语it的所指。根据分号提示，it指代第1个分句的主语the development of speech，即答案所在。
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大学英语六级

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