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Unit13

We're trying to save the earth!

【重点短语】

1. at the bottom of the river 在河床底部

2. be full of the rubbish 充满了垃圾

3. throw litter into the river 把垃圾扔入河中

4. play a part in cleaning it up 尽一份力把它清理干净

5. land pollution 土地污染

6. fill the air with black smoke 使空气中充满了黑烟

7. cut down air pollution 减少空气污染

8. make a difference 产生影响

17. take action 采取行动

18. turn off 关掉

19. pay for 付费