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A.all of that B.as if it were C.fresh water supply D.in this field A.A limited【T13】______ B.so that it can be used again j
A.all of that B.as if it were C.fresh water supply D.in this field A.A limited【T13】______ B.so that it can be used again j
admin
2015-07-15
24
问题
A.all of that B.as if it were C.fresh water supply D.in this field
A.A limited【T13】______
B.so that it can be used again just【T14】______from a spring
C.And we cannot even use【T15】______
D.Experiments have already been done【T16】______
The world is not only hungry, it is also thirsty for water. It seems there is plenty of water, but about 97% of this huge amount is sea-water, or salt water. Man can only drink and use the other 3% fresh water.【T17】______, 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.【T18】______, 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.【T19】______, 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【T20】______.
【T20】
选项
答案
B
解析
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,所以选项B“以便它可以被再次使用,就像它是新鲜泉水”为正确答案。
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