Unit 13 We are trying to save the earth.知识点及练习Section A 知识点1. try v. 试图，努力，尝试 使用方法：try to do sth. 竭力做某事 try doing sth. 尝试做某事try one's best (to do sth.) = do one's best (to do sth.) 尽某人最大的努力(做某事) 短语：try on 试穿 try out 试用，参与选拔 have a try 尝试，试一下 let me try 让我试一下2.the earth 地球，表达世界上独一无二的事物前面要加定冠词 the。短语：on the earth 在地球上 on earth 究竟，究竟3. pollution n.污染，污染物 →pollute v. 污染→ polluted adj.被污染的短语：air pollution 大气污染，空气污染 noise pollution 噪音污染 water pollution 水污染4. litter v. 扔垃圾 n.垃圾= rubbish = trash 短语：take out the rubbish 倒垃圾 throw rubbish / litter 扔垃圾5. the bottom of… …的底部 the top of … …的顶部6. be full of = be filled with 充斥……7. play a part 参与…；起作用play a part in “在…方面起作用；参与…”，后接名词、代词或动词-ing 形式。8.cut 短语 cut down 减少，把……砍倒 cut in 插话 cut off 切断；断绝cut up 切碎cut out 删除9. instead of 介词短语，后跟名词、代词或动词 ing 形式。instead 副词，常位于句末。位于句首时，其后有逗号。10. It’s good for health and it doesn't cost anything! (P98) 11.be good for 对……有益，反义词组 be bad for。be good at 擅长”，后接名词、代词或动词-ing 形式，同义词组 do well in。be good with “善于应付……”。be good to “对……友好”, 同义词组 be friendly to。12. cost 主语是物， sth. cost(s) (sb.) some money. 某事物花费了某人某些钱spend 主语是人，sb. spend(s) time/money on sth. 某人花费时间/金钱在某物上 sb. spend(s) time/money (in) doing sth.某人花费时间/金钱做某事 pay 主语是人，sb. pay(s) some money for sth. 某人为某物支付金钱 take 多表达花费时间，It takes sb. some time to do sth. 做某事花费某人某些时间13. make a (big/ much) difference to sb./sth. 对某人/某事物有(大)影响/有关系14. lea...
