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第89页

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many beautiful parks.

 There are many trees and flowers in the parks.

 there is rubbish on the ground.

 from cars

 the air dirty

litter on the ground.

We should put rubbish in the bin. We shouldn't drive our car too often. Smoke from cars

makes the air dirty. We should take a bus or ride a bike to go out more often. We should

plant more trees. They can keep the air clean.