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  3. In the 17th century, a writer explained the theory about the function of laughter supported by most people. A baby begins to la

In the 17th century, a writer explained the theory about the function of laughter supported by most people. A baby begins to la

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问题 In the 17th century, a writer explained the theory about the function of laughter supported by most people.
A baby begins to laugh and becomes a comparatively sophisticated creature when he is at the age of ______.
选项
答案12 weeks
解析 第12段2、3句：The smile comes before laughter，as demonstrated by the infant who can barely smile after six days，but sometimes laughs at twelve weeks．By the twelve-week stage he becomes a comparatively sophisticated creature...空白处需要表年龄的名词成分。原文的时间概念是用at介词短语表达的，题目改成了when引导的时间状语从句，只要准确定位，就能很容易得出答案12 weeks。
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