新目标英语九年级Unit 13知识要点归纳

来源：中学生英语, 2021, (03): 24.

<正>[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6. fill the air with black smoke空气中充满黑烟7. cut down air pollution减少空气污染8.make a difference产生影响9.shark fin soup鱼翅汤10.at the top of the food chain处于食物链的顶端11.in the last 20 to 30 years在最近的20到30年间