请根据短文的内容，回答题。AThirstyWorldTheworldisnotonlyhungry,itisalsothirstyforwater.T

共享题干题请根据短文的内容，回答题。 A Thirsty World The world is not only hungry, it is also thirsty for water. This may seem strange to you, since nearly 75% of the earth's 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. __________ (46), because some of it is in the form of icebergs and glaciers. Even worse,.Some of it has been polluted. At the moment, his 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. One of the useful steps we can take is to stop unlimited use of water. __________ (47), however, would have a bad effect on agriculture and industry. In addition to stopping wasting our precious water, one more useful step we should take is to develop ways of reusing it. __________ (48), but only on a small scale.Today, in most large cities, water is used only once and it eventually retums 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 __________ (49). __________ (50), we still would not have enough. Where could we turn next? To the oceans! All we'd have to do to make use of the vast amount of sea-water is to remove the salt. This salt-removing process is already in use in many parts of the world. So if we take all these steps,we'll be in no danger of drying up!1.[不定向选择题]第48题____________A.A limited water suppl B.So that it can be used again just as if it were fresh from a sprin C.It is possible to purify large amounts of sea wate D.But even if every large city purified and reused its wateE.And we cannot even use all of thaF.Experiments have already been done in this fielABCDEF确定 2.[不定向选择题]第49题____________A.A limited water suppl B.So that it can be used again just as if it were fresh from a sprin C.It is possible to purify large amounts of sea wate D.But even if every large city purified and reused its wateE.And we cannot even use all of thaF.Experiments have already been done in this fielABCDEF确定

1.参考答案：F
参考解析：从原文来看，空白处前一句说的是“除了停止浪费我们珍贵的水资源，我们要采取的重要的一步就是发明重复利用水的方法”，空白处后面的句子说的是“但是只是小规模的”，所以这个空格内填入的应该与发明重复利用水源的方法有关，故选项F“在这个领域内开展了很多实验”为正确答案。?
2.参考答案：B
参考解析：从原文来看，空白处前一句说的是“在那里，它被过滤并用化学成分处理”，所以空格内填入的应该与水的处理有关，因此选项B“以便它可以被再次使用，就像它是新鲜泉水”为正确答案。?3.[不定向选择题]第46题____________A.A limited water suppl B.So that it can be used again just as if it were fresh from a sprin C.It is possible to purify large amounts of sea wate D.But even if every large city purified and reused its wateE.And we cannot even use all of thaF.Experiments have already been done in this fielABCDEF确定

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