Scientists think the difference between animals and men is ______. The passage tells us that man can speak because ______.

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问题 Scientists think the difference between animals and men is ______.
The passage tells us that man can speak because ______.

选项 A、he can read and write
B、he is different from animals
C、he can learn and think
D、he has a big brain

答案D

解析 本题询问人类能够说话是因为什么。根据原文(38)处可知.人类能够说话是因为有大脑,故选D。
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