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  3. On several occasions over the past decade, a heavy cloud of air pollution has covered the east of the United States and brought

On several occasions over the past decade, a heavy cloud of air pollution has covered the east of the United States and brought

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问题 On several occasions over the past decade, a heavy cloud of air pollution has covered the east of the United States and brought health warnings in rural areas away from any major concentration of manufacturing and automobile traffic. ( Passage 1 )
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答案在过去的十年里，有很多次，大团被污染的空气笼罩着美国东部，给那些远离主要生产和交通堵塞地区的农民们敲响了健康警钟。
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