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

查看答案

A. helpfulB. harmfulC. safe D. normal

A. helpfulB. harmfulC. safe D. normal

查看答案

A. passedB. refusedC. stoodD. failed

A. passedB. refusedC. stoodD. failed

查看答案

__________ his homework, the boy began to watch TV.

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

查看答案