According to Darwin why do people laugh?A.Laugh is a survival technique for babies.B.They

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According to Darwin, why do people laugh?

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.

请帮忙给出正确答案和分析,谢谢!

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