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第54页

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Frogs can live in the water.

Because they are safe up there.

The snakes in the trees.

Their houses are made of wood.

We should protect it. We should put rubbish in the bin. We should

plant more trees. Because trees help keep the air clean. We shouldn't drive so much.

Smoke from cars makes the air dirty. We can walk to school and our parents can go to

work by metro. We should save water. We can reuse water to water the flowers. We

should not use too many plastic bags or bottles. We can use paper bags and glass bottles.