全國英語等級考試(PETS四級)難詞精選

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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.

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