4．It can be concluded from the passage that ________.

　　A．chimpanzees usually choose playthings for their children

　　B．different factors cause humans and chimpanzees to choose different playthings

　　C．only female chimpanzees have playthings

　　D．both humans and chimpanzees choose their playthings due to sex difference

　　解析：选D　推理判断题。综合文章内容可知，无论是人类还是黑猩猩，性别是导致玩具选择差异的重要原因。故选D项。

　　B

　　(2017·辽宁五校联考)

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　　In it you will find your

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