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  3. Man has a big brain. He can think, learn and speak. Scientists used to think that man is different from animals because he think

Man has a big brain. He can think, learn and speak. Scientists used to think that man is different from animals because he think

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问题     Man has a big brain. He can think, learn and speak. Scientists used to think that man is different from animals because he thinks and learns. They know now that animals-dogs, rats and birds—can learn. So scientists are beginning to understand that men are different from animals because they can speak. Animals cannot speak. They make noises when they are afraid, or hungry, or unhappy. Apes(类人猿)are our nearest cousins. They can understand some thing more quickly than human beings, and one or two have learned a few words. But they are still different from US. They can never think about the past or the future. Language is a wonderful thing. Man has been able to develop civilization because he has language. Every child call speak his own language very well when he is four or five—but no animal learns to speak. How do children learn? Scientists do not really know. What happens when we speak? Scientists do no really know. They only know that man can speak because he has a big brain．  
Now, scientists still don’t really know______．
选项 A、whether animals can think about the past and the future
B、how children learn and what happens when we speak
C、why animals can understand some things more quickly than human beings
D、at what age, a child can speak his language very well
答案B
解析 细节题。由文章后面几句“How do children learn? Scientists do not really know. What happens when we speak? Scientists do not really know. ”可总结出答案。
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