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Pollution is a serious problem. Scientists have _______ some
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Pollution problem is very serious. Can we _____? [
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The problem of air pollution is becoming more serious ______
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Air pollution is___most serious problem in many major cities
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Air pollution is___most serious problem in many major cities
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（ ）the air pollution is the most serious problem .We should
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why air pollution is the most serious?
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Pollution isn't a big problem now,is it?( ) Pollution isn't
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英语翻译Some scientists have also suggested that Earth is a kind
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_____ serious the water pollution is in our city today!A)Wha
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_____ you may have.可以填What a serious problem吗