新目标英语九年级Unit 13知识要点归纳

[重点词组或短语]1.at the bottom of the river在河床底部2.be full of 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。