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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
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
admin
2017-04-24
26
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 sea-water, 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 can 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 turn 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
【B7】
选项
答案
L
解析
此处需要填一个副词,备选单词中有两个副词,其中rapidly前面已选用过,现只剩下once。once意思是“一次”,once非常适合此处语境:在很多大城市,水只使用一次,然后记流入大海或地下水库。因此此题应选L。
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