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  3. In the 17th century, a writer explained the theory about the function of laughter supported by most people. A chimpanzee occasi

In the 17th century, a writer explained the theory about the function of laughter supported by most people. A chimpanzee occasi

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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 chimpanzee occasionally exhibits behavior that looks like a primitive human laughter under any conditions.
选项 A、Y
B、N
C、NG
答案B
解析 第4段第1、2句：Those of us who have observed chimpanzees closely feel quite confident that the chimpanzee occasionally exhibits behavior that looks very much like a primitive human laughter．This behavior，however，has been observed only in a human context；whether or not it occurs under natural conditions is dubious...原文该段第2句的this behavior指第1句提到的黑猩猩偶尔会有一些类似人类原始的笑的行为，但条件是 only in a human context．题目中的under any conditions与原文完全不同．所以答案是N。
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