题目

化学就在我们身边，它能改善我们的生活。请从“①钛合金②氢气③干冰④活性炭”中选择适当的物质填空(填序号)。 （1）可用于人工降雨的物质是          ； （2）能用于冰箱中除去异味的物质是          ； （3）被认为最清洁最理想的燃料是          ； （4）可用来制造人造骨的是          。    III  阅读理解（共25小题；每小题2分，0分） 阅读下列短文，从每题所给的A、B、C和D项中，选出最佳选项，并在答题卡上将该项涂黑。                                  It doesn't matter when or how much a person sleeps, but everyone needs some rest to stay alive. That's what all doctors thought, until they heard about Al Herpin. Al Herpin, it was said, never slept. Could this be true? The doctors decided to see this strange man themselves. Al Herpin was 90 years old when the doctors came to his home in New Jersey. They thought for sure that he got some sleep of some kind. So they stayed with him and watched every movement he made. But they were surprised. Though they watched him hour after hour and day after day, they never saw Herpin sleeping. In fact, he did not even own a bed. He never needed one. The only rest that Herpin sometimes got was sitting in a comfortable chair and reading newspapers. The doctors were puzzled by this strange continuous sleeplessness. They asked him many questions, hoping to find an answer. They found only one answer that might explain his condition. Herpin remembered some talk about his mother having been injured several days before he was born. But that was all. Was this the real reason? No one could be sure. Al Herpin died at the age of 95.  41.The main idea of this passage is that _______ A. everyone needs some sleep to stay alive B. people can live longer by trying not to sleep C. large numbers of people do not need sleep D. a person was found who actually didn't need any sleep 42.The doctors came to visit Herpin, expecting ______ A. to find out whether his sleeplessness was really true B. to find out why some old people didn't need any sleep C. to find a way to free people from the need of sleeping D. to cure him of his sleeplessness 43. After watching him closely, the doctors came to believe that Al Herpin ____ A. needed no sleep at all                     B. needed some kind of sleep    C . was too old to need any sleep       D .often slept in a chair 44.One reason that might explain Herpin' s sleeplessness was ______ A. his mother's injury before he was born B. his magnificent physical condition C. that he had gradually got rid of the sleeping habit D. that he hadn't got a bed 45.Al Herpin' s condition could be regarded as ______ A. a common one      B. very healthy      C. one that could be cured    D. a rare one