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题型:单选题 题类:常考题 难易度:普通

仁爱科普版九年级上Unit 2 Saving the earth. Topic 1 Pollution has causestoo many problems.同步练习1

—There are several chemical factories pouring waste water into the stream.

—They may cause         .

A、air pollution B、water pollution C、noise pollution D、light pollution
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