新目标英语九年级Unit 13知识要点归纳

来源：中学生英语, 2019, Z2: 50.

<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