2019中考英语复习：大学英语四级单词提前预热
2019-05-13 13:23:29中考网整理
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We can do like these things:
First we must protect the factory form pouring waste water into the river
Second we should stop people from throwing litter into the river.many kinds of litter may pollute the envirenment.
Finally we can tell the visitors how important the water is.
After doing these things,I think water will become clearer sooner or later.
