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  3. 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 t

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 t

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问题                                 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【B1】________with water．But about 97％of this huge amount is seawater, or salty water．Man can only drink and use the other 3％—the【B2】________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【B3】________, some of it has been polluted．
    At the moment．this small amount of fresh water is still enough for us．However, our demand for water is increasing【B4】________．Only if we take steps to deal with this problem now can we avoid a severe worldwide water【B5】________later on．
    In addition to stopping wasting our precious water, one useful step we should take is to【B6】________ways of reusing it．
    Today, in most large cities, water is used only【B7】________and it eventually returns to the sea or runs into underground storage tanks, But it is【B8】________to pipe water that has been used to a purifying (净化)plant, There it can be filtered and treated with chemicals so that it call be used again just as if it were fresh from a spring．
    But even if every large city purified and【B9】________its water, we still would not have enough． Where could we tum next? To the oceans! We can make use of the vast amount of sea-water by removing the salt．This salt-removing【B10】________is already in use in many parts of the world．
A、used
B、fresh
C、develop
D、process
E、possible
F、shortage
G、worse
H、reused
I、rapidly
J、covered
K、new
L、once
【B9】
选项
答案H
解析 and连接的前后两部分属于并列成分，由于and前面是动词过去式purified，因此，此空(and后面)也应填动词的过去式。reused(再利用)适合此处语境：但即使一些大城市净化并再利用水资源……因此此题应选H。
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