问题补充：
The most serious problem we are facing now is how to all the pollution.
A. get rid of
B. get on with
C. get through with
D. get down to
答案：
(答案→)A. get rid of
B. get on with
C. get through with
D. get down to
解析： 考查短语辨析。get rid of 摆脱，除去，get on with 与某人相处，get through with 通过，get down to 着手做某事，句意：我们现在面临的最严重的问题就是如何除去所有的污染。所以选A。
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