Question

11．21．Water pollution makes our rivers and lakesdirty．
22．Noisepollution makes us talk louder．
23．We need to do a lot of things tofightpollution．
24．Factorics must clean their waste water before it isthrownaway．
25．If there are fewer peopledrivingon the roads there will be less pollution．

Answer 1

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解答 21．dirty  22．Noise  23．fight  24．thrown  25．driving

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