完型填空 Man has a big brain(脑)．He can think, learn and speak．Scientists once though

完型填空

Man has a big brain(脑)．He can think, learn and speak．Scientists once thought that man was different from animals 1 they can think and learn．They know now that dogs, monkeys, birds can learn, too．

They are beginning to understand that men are different from animals because they can speak．Animals can’t speak．They make noises when they are afraid, or unhappy．Apes(类人猿)can understand some things more quickly 2 man．One or two of them have learned 3 words．But they can not join words to 4 sentences．They can not think 5 us because they have 6 language．Language is a wonderful thing．Man has been able to build a modern world because he has language．7 child can speak his own language very well when he is four or five, 8 no animals learn to speak．9 do children learn it?Scientists don’t really know．10 happens inside our body when we speak?They don’t know．They only know that man can speak because he has a brain．

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