职称英语综合类A级阅读理解习题精解(4)

　　The world is not only hungry, it is also thirsty for water. This may seem strange to you, since nearly 75% of the earths surface is covered with water. But about 97% of this huge amount is sea-water, or salt water. Man can only drink and use the other 3% - the fresh water that comes from rivers, lakes, underground, and other sources. And we cannot even use all of that, because some of it is in the form of icebergs and glaciers . Even worse, some of it has been polluted. 　　At the moment, this small amount of fresh water is still enough for us. However, our need for water is increasing rapidly. Only if we take steps to deal with this problem now can we avoid a severe worldwide water shortage later on. A limited water supply would have a bad effect on agriculture and industry. 　　In addition to stopping wasting our precious water, one useful step we should take is to develop ways of reusing it. Experiments have already been done in this field, but only on a small scale. 　　Today, in most large cities, water is used only once and it eventually returns to the sea or runs into underground storage tanks. But it is possible to pipe water that has been used to a purifying plant. There it can be filtered and treated with chemicals so that it can be used again just as if it were fresh from a spring. 　　But even if every large city purified and reused its water, we still would not have enough. Where could we turn next? To the oceans! All wed have to do to make use of the vast amount of sea-water is - remove the salt. This salt-removing process is already in use in many parts of the world. 　　So if we take all these steps, well be in no danger of drying up! 　　31 The phrase the world in the first line of the passage refers to 　　A man. 　　B you. 　　C woman. 　　D they. 　　A Nearly 75 per cent. 　　B About 97 per cent. 　　C Exactly 3 per cent. 　　D Less than 3 per cent. 　　33 According to the passage, we can avoid a worldwide water shortage in the future by 　　A increasing rainfall. 　　B reusing water and utilizing sea-water. 　　C cutting down our consumption of water. 　　D reducing the number of factories producing steel. 　　34 Which of the following statements, according to the passage, is NOT true? 　　A A limited water supply will affect industrial production. 　　B Every large city purifies and reuses its water. 　　C Purified water is not exactly as fresh as spring water. 　　D Oceans are the largest water source. 　　A heating it up. 　　B treating it with chemicals. 　　C taking salt out of it. 　　D drying it up. 　　31. A32. D33. B 34. B35. C 　　31. A 第一句的深层意思是人类不仅面临粮食危机，也面临水资源危机，因此 the world 代指 man 。我们也可以从本段第四句判断出来，它的主语是 man。 　　32. D 根据第一段得知，地球上只有3%的水适于人类饮用，然而部分以冰山或冰川的形式存在，还有的被污染，因而实际上人类能用的水要低于3%。 　　33. B 答题依据在第三段和第四段。第三段提到水的再利用是一个有效缓解水资源不足的方法，第四段提到可以通过净化、过滤等化学方法使得海水变得可饮用。 　　34. B 第四段的首句提到多数城市的水只用一次，因此选项 B 说法错误，其他选项在文中均有体现。 　　35. C 海水之所以不能饮用就是因为它是咸的。答题依据在第五段，remove the salt 即 take salt out 。