256,144,217,107,182,(  )

256,144,217,107,182,(  ) A.96 B.85 C.74 D.117

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我国大气环境污染问题日益严峻,并逐渐呈现区域性复合型污染的新_________。目前,大气污染的范围已不再局限于单个城市

我国大气环境污染问题日益严峻,并逐渐呈现区域性复合型污染的新_________。目前,大气污染的范围已不再局限于单个城市或单个工业区周围,城市问大气污染的相互影

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A. helpfulB. harmfulC. safe D. normal

A. helpfulB. harmfulC. safe D. normal

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__________ his homework, the boy began to watch TV.

__________ his homework, the boy began to watch TV.A.Having done B.To do C.Doing

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