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最佳答案:Developed countries are facing the population problem is a serious aging populat
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最佳答案:1.It will have a long way to go to settle down all the problems about Changjiang
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最佳答案:With global warming to the survival and development of mankind, along with the s
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最佳答案:Gold Rush occupies an important position in Canada's history.It not only led to
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最佳答案:In now days,the global warming is threatening the living and development of huma