during rush hours B.in spring and autumn C.to toxic air D.between autumn and winter E.as exposure to nuclear radiation F.on the downwind side Air pollution can be as harmful to one's health ______.
A.
【参考答案】
E E 解析:在题干中出现了as这个词,一般来说后面应该还会出现一个as以表示比较,从这一语法要求出发我们在六个......