As far as the woman is concerned, why do only human beings and a few other prima

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问题 As far as the woman is concerned, why do only human beings and a few other primates laugh?

选项 A、That’s the result of evolution.
B、They are superior to other animals.
C、For the sake of survival.
D、The cause is not clear.

答案 D

解析事实推理题。女士说尽管经过多年的科学研究，还没有人确定为什么人类和少数的灵长类动物会笑。所以选择D。

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