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第四课时Section B (1a1e),Unit 13Were trying to save the earth!,Recycling paper is really easy.循环利用纸真的很容易。 I agree.But its hard to stop riding in cars.我同意你的观点，但是停止驾车很难。 recycle动词，意为“再循环，回收利用”。前缀re表示重复，意为“又，再”。 eg：repeat重复 reuse重新使用 recycling paper是动词ing形式短语作主语，其后的谓语用单数形式。该句可以改写为“Its really easy to recycle paper.”。,句中it为形式主语，to stop riding in cars是动词不定式短语作真正的主语。 stop doing sth.意为“停止做某事”；而stop to do sth.意为“停下正在做的事去做另外一件事”。 eg：The baby stopped crying as soon as he saw his mom.这个婴儿一看见他的妈妈就停止了哭泣。 After twohour work，we stopped to relax.两个小时的工作以后，我们停下来去放松了一下。 【拓展】stop sb./sth.from doing sth.阻止某人/某物做某事,【辨析】while，when与as 三者均可表示“当时候”。若主句表示的是短暂的动作，而从句表示的是一段时间，三者可通用。 eg：I met Tom as/when/while I was walking along the street.当我沿街散步时碰见了汤姆。 when和while意为“当的时候”，when可以表示时间点，也可以表示时间段，谓语动词可以是终止性动词也可以是延续性动词。而while只表示“在某一段时间里”，因此它引导的从句中的动词必须是延续性的。as则含有主从句动作同时发生之意。,一、根据句意，用括号中所给单词的适当形式填空。 1It is very important (recycle) paper and books. 2Since then，the government (pass) laws to protect them. 3 (climb) mountains is really fun. 4You should turn off the shower while you are (wash) your hair. 5The driver stopped (drive) when he saw some children crossing the street.,to recycle,has passed,Climbing,washing,driving,二、单项选择。 ( )6. I got home，my sister was doing her homework.(2016，北京) AWhenBBecauseCIf DThough ( )7.The boy is sleeping.Please the radio.(2015，益阳) Aturn up Bturn off Cturn on ( )8.To protect the environment，people are supposed to some waste things. Areceive Brecycle Creflect Dreview,A,B,B,( )9.Bob took a photo of his girlfriend while she at the party.(2015，资阳) Adances Bwas dancing Chas danced Dis dancing ( )10.The traffic is becoming worse and worse in big cities because of private cars. .People should use public transportation more often. AI agree BId love to CI hope not DIm afraid not,B,A,三、从方框中选择合适的选项补全对话。(其中有两项多余) Bob：Good morning，Kim. Kim：Good morning. Bob：11. It can save a lot of time. Kim：Well，I prefer walking to driving a car. Bob：Mm，its good for health and the environment. Kim：Yes.The environment is very important for us.12. Bob：Yeah，right.What else can we do? Kim：For example，wed better not buy clothes made of animal fur. Bob：I agree with you.13. Anything else?,B,A,D,Kim：Dont use plastic bags. Bob：14. Kim：Yes，they are really useful for us.But they pollute our environment. Bob：15. Kim：We can use cloth bags instead of plastic ones. Bob：Thats a good idea.Oh，its late.I must go now.See you! Kim：See you！Bye! AEveryone should do something for it. BWhy dont you drive to work? CIts useless for protecting plants. DIts a good way to protect animals. EBut dont you think they are really convenient in our daily lives? FWhy do you go to work in a car? GHow can we carry things after shopping，then?,E,G,
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