选A. 这是一个反义疑问句,回答时要根据事实作答.像这个问句：现在污染不是一个大问题,是吗?回答时要看答案是肯定还是否定,污染当然是个大问题,所以就回答Yes ,it is.
Pollution isn't a big problem now,is it?( ) Pollution isn't
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