Man has a big brain. He can think and s【小题1】languages. Scientists once thought that man isn’t the same as animals b【小题2】man can think and learn. They know now that dogs, monkeys and birds can learn, too.                                               

They are beginning to u【小题3】that men are different from animals because they can speak. Animals can’t speak. They make much n【小题4】when they are afraid, or unhappy. Apes(猿) can learn some things more quickly than man. One or two of them have learned a few words. But they cannot p【小题5】words together to make sentences. They cannot think l【小题6】us because they have no language. Language is a wonderful thing. Man is a【小题7】to build a modern world because he has language. Every child can speak his own language very w【小题8】when he is four or five, b【小题9】no animals learn to speak.                           

How do children learn it? Scientists don’t really know w【小题10】happens inside our body when we speak. They only know that man can speak because he has a brain.