--Thecarsgiveoffagreatdealofwastegasinthestreets. --Yes...

问题详情：

--The cars give off a great deal of waste gas in the streets. 

--Yes.  But I'm sure something will be done to ____ air pollution.

A. reduce                B. remove             C. collect                   D. warn

【回答】

A

知识点：动词

题型：选择题