2. 外语
  3. In the 17th century, a writer explained the theory about the function of laughter supported by most people. Laughter was distri

In the 17th century, a writer explained the theory about the function of laughter supported by most people. Laughter was distri

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问题 In the 17th century, a writer explained the theory about the function of laughter supported by most people.
Laughter was distributed as a characteristic common to mankind because of its ______.
选项
答案infectious quality
解析 第7段第2句：In addition，laughter’s infectious quality helped distribute it as a characteristic common to all mankind．空白处需要名词性成分。题目把原文的主动句改成了被动句，因此答案需在原文的主语中查找。题目用in指代了原文中的laughter’s．故答案为其后的成分。
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大学英语六级

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