九年级下册英语第13单元重点短语（九年级英语Unit13短语集锦）

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

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