问题补充：
根据短文内容及首字母提示，填写所缺单词.
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 join w【小题5】to make sentences. They cannot think l【小题6】us because they have no language. Language is a wonderful thing. Man has been 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.speak
答案：
(答案→)speak
解析：本文叙述了人不同于动物，人会说话而动物不会说话。动物害怕或不高兴时会发出噪音。因为动物没有语言，他们不可能像我们一样思考。科学家也弄不明白当人说话时，人体内部发生了什么。
【小题1】与languages.连用，表示说语言。句意：他会思考和说话，故用动词speak。
【小题2】句意：科学家曾经认为人脑与动物的大脑不一样，因为人会思考和说话，根据句意前后是因果关系，故用连词because。
【小题3】句意：他们开始理解到人不同于动物，因为人会说话。结合句意，此处用动词understand。
【小题4】make noise 发出噪音。句意：动物害怕或不高兴时会发出噪音。故此处用名词noise。
【小题5】join words to make sentences. 连词成句。句意：但是他们不会连词成句，故此处用名词words。
【小题6】根据they have no language. 可知他们没有语言，我们会说话，因此此处指他们不像我们。句意：因为他们没有语言，他们不可能像我们一样思考。故用介词like（像）。
【小题7】句意：因为人类有语言，他们能建造一个现代的世界。be able to 能够，会。
【小题8】句意:每个孩子四，五岁是说自己的母语说的很好，结合句意，此处用副词well。
【小题9】句意：但是动物没有学会说话。前一句说人说自己的母语说的好，后一句说动物不会说话，后世转折关系，故用连词but。
【小题10】谓语动词know 后的宾语从句缺少主语，表示事物故用代词what。句意：科学家也弄不明白当人说话时，人体内部发生了什么。
根据短文内容及首字母提示 填写所缺单词.Man has a big brain. He can think and s【小题1】languages. Scientists once
