__________ 查看材料A.A limited water supplyB.so t
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__________ 查看材料
A.A limited water supply
B.so that it can be used again just as if it were fresh from a spring
C.It is possible to purify large amounts of sea water
D.But even if every large city purified and reused its water
E.And we cannot even use all of that
F.Experiments have already been done in this field
请帮忙给出正确答案和分析，谢谢！
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正确答案：正确A
从原文来看，空白处的前面一句说的是“有用的一步就是停止无限量地使用水”，空白处后面的句子说的是“但是，将会对农业和工业造成不利影响”，由此可知空白处填入的应该是与水的供给相关的内容。所以选项A“有限的水供给”为正确答案。