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最佳答案：在世界环保日到来前夕,联合国教科文组织就如何处理垃圾问题向全世界中学生征文.请你以Saving Our City 为题,根据所给提示写一篇120词左右的短文.文
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最佳答案：Environmental problems are becoming more and more serious all over the world.For
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最佳答案：My name is ××.When I grow up,I want to be a biology teacher because then I could
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最佳答案：人为因素Human factors城市有毒颗粒物来源：City of toxic particulate matter sources:第一：是汽车尾气。使用柴
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最佳答案：Environmental problems are becoming more and more serious all over the orld. Wit