答案：　C

　　．A scientific theory should be one that________.

　　A．not only works under one set of conditions sometimes，but also works under the same conditions at other times

　　B．leaves no room for improvement

　　C．does not allow any change even under different conditions

　　D．can be used for many purposes

　　解析：　细节理解题。由“What works under one set of conditions sometimes must work under the same conditions at other times.”可知答案。

　　答案：　A

　　．What is the main idea of the passage?

　　A．Scientists are different from ordinary people.

　　B．The theory of relativity.

　　C．Exactness is the center of science.

　　D．Exactness and way of using tools are the keys to the making of a scientist.

　　解析：　主旨大意题。本文第一句“What makes a person a scientist？”提出了文章的主题，第一段论述“how a scientist uses these tools makes him a scientist”，第二段论述“The scientist’s knowledge must be exact”，故D正确。其余各项只是文章中的细节。

　　答案：　D

　　Bill Javis took over our village’s news-agency at a time of life when most of us only wanted to relax. He just thought he would like something but not too much to do, and the news-agency was ready-made. The business produced little enough for him, but Bill was a man who only wanted the simplicity and order and regularity of the job. He had been a long-serving sailor, and all his life had done everything by the clock.

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