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 ______.

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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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