精选优质文档-倾情为你奉上Unit13 Were 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20. add up 累加21. use public transportation 使用公共交通22. recycle books and paper 回
