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12．

Pollution in our life
Some types of pollution	•（21）Airpollution It is bad to living things in the world． •Water pollution It kills our fish and pollutes our drinking water． •Noise pollution It makes us talk louder and become angry more（22）Costly
Ways to（23）preventpollution	Factories must clean their waste water（24）beforeit is thrown away． If there are fewer people driving on the road，there will be（25）lesspollution．

分析略

解答 21．Air 22．Costly 23．prevent 24．before 25．less

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