According to Darwin, why do people laugh?

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问题 According to Darwin, why do people laugh?

选项 A、Laugh is a survival technique for babies.
B、They laugh to ease hostilities.
C、They laugh to make parents feel relaxed.
D、They laugh to fight off disease.

答案A

解析 事实推理题。达尔文认为婴儿的微笑是进化过程中形成的对父母的“奖励”,父母陶醉于婴儿的微笑,这鼓励他们继续照顾婴儿。我们可以推测出微笑是婴儿的生存技巧。所以选择A。
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