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短文改错
Our school lies on the foot of a mountain with a small river passes by in front. It used to look like a beautiful garden. In the garden there are ever-green trees and all kinds of flowers in the school yard all years round.
But great changes have been taken place after a chemical factory was built near our school a year ago. It produces various poisonous gases and pours a lot of waste water into a river. This has terrible polluted the surroundings of our school.
I think that the local government must takes steps to protect our surroundings and prevent from being polluted.
