85. The look on his face is ______________(令人害怕的).

84. What a ________________(极好的) idea!

83. F __________, the traffic wasn’t too bad so I managed to go to the meeting on time.

82. The police are trained to deal with every situation in a calm and p______　 　manner.

请根据首字母或汉语提示完成句子。

81. After hearing the bad news, he a______　　　　　　 himself to sadness.

Man has a big brain (脑) . He can think, learn and speak. Scientists once thought that man was different from animals　 71　 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　 72　 man. One or two of them have learned　 73　 words. But they can not join words to　 74　　 sentences. They can not think　 75　 us because they have　 76　 language. Language is a wonderful thing. Man has been able to build a modern world because he has language.　 77　 child can speak his own language very well when he is four or five, 　　78　 no animals learn to speak.　 79　 do children learn it? Scientists don’t really know.　 80　 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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