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最佳答案：City of the living environment more and more bad, poor air quality, everywhere i
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最佳答案：There is a small river in my hometown. Two years ago, in a chemical factory was
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最佳答案：Because the humanity uses the resources excessively and discharges the waste gas
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最佳答案：1, she devoted all her time in the protection of wild animals.2, when he returne