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　　Unit13 知识梳理

　　【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

　　20. add up 累加

　　21. use public transportation 使用公共交通

　　22. recycle books and paper 回收书和废纸

　　23. use paper napkins 使用纸巾

　　24. turn off the shower 关掉喷头

　　25. ride in cars 开车出行

　　【重点句型】

　　1.Even the bottom of the river was full of rubbish.

　　即使河底都充满垃圾。

　　2.Everyone in town should play a part in cleaning it up.

　　城里的每个人都应当尽一份力把它清理干净。

　　3.The air is badly polluted because there are too many cars on the road these days.

　　空气被严重污染因为如今路上的汽车太多了。

　　4.To cut down air pollution, we should take the bus or subway instead of driving.

　　为了减少空气污染，我们应当乘坐公汽或地铁而不是开车。

　　5. I used to be able to see stars in the sky.

　　我过去能在天空中看到星星。

　　6. The air has become really polluted around here. I’m getting very worried.

　　这儿的空气真的已经被污染了，我非常担心。