Scientists think the difference between animals and men is ______. [br] The pass

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问题 Scientists think the difference between animals and men is ______. [br] 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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[originaltext]Whatistheprobablerelationshipbetweenthetwospeakers?[/orig