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The main reason for severe water problem in the near future is pollution.

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不论在远古还是在现代社会,自学都起着十分重要的作用(举例说明) 2.其重要性主要体现在哪些方面? 3.你认为应如何进行自学?
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The UN’s World Summit on Sustainable Development and Rio Earth Summit of 1992 contribute to solving water supply problem.
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