《最新九年级英语上册Unit2Topic2AlltheseproblemsareveryseriousSectionB课件仁爱版课件》由会员分享，可在线阅读，更多相关《最新九年级英语上册Unit2Topic2AlltheseproblemsareveryseriousSectionB课件仁爱版课件（25页珍藏版）》请在金锄头文库上搜索。
1、Unit 2Saving the EarthTopic 2All these problems are very serious.Section BTeaching aims and demands1. Learn some new words and phrases:sand, cut down, change into, prevent, law, prevent from, human being, although, turn off2. Learn some useful sentences: (1) I couldnt see anything, and my face hurt
2、while I was walking down the street just now. (2) Pass laws against water pollution. (3) Remember to turn the tap off when you leave.3. Continue to learn the indefinite pronoun and adverb.4. Learn to talk about pollution and its harm.New wordssandn.沙，沙子sandstormn.沙尘暴cut down砍倒change into转换成，把变成deser
3、tn.沙漠v.舍弃，遗弃preventv.法律，法令；定律prevent from关掉（水、电、煤气等的）龙头human being人althoughconj. 虽然，尽管lawn.法律，法令；定律turn off关掉（水、电、电视、收音机等）tapn.（自来水、煤气等的）龙头1a Listen, read and saysandstorm(Kangkang, Maria and Jane are talking in a room. The wind outside is blowing strongly.)Kangkang: What bad weather! The wind is bl
4、owing strongly with lots of sand. I couldnt see anything, and my face hurt while I was walking down the street just now.Maria: Im sorry to hear that. But what causes these sandstorms?Jane: People have cut down too many trees. As a result, a lot of rich land has changed into desert.【点击播放点击播放点击播放点击播放】
5、Maria: Thats bad, but how can that affect the weather?Jane: Trees can stop the wind from blowing the earth away.Kangkang: And a lot of water can be saved by forests.Jane: They can also prevent the water from washing the earth away.Kangkang: Cutting down trees is harmful to human beings, animals and
6、plants. Although we have built “the Great Green Wall”, we still need to work hard to protect the environment.1b Work aloneRead 1a again. Answer the questions. Then make notes about the functions of trees.1. What are they talking about?2. What causes this kind of bad weather?1c Group workDo you know
7、how sandstorms come into being? Number the pictures and then talk about the sandstorm in groups.wash the earth awaymany treeschange into desert sandstormscome into Beijingforests gonecut down trees2 Group workRead and discuss different ways of protecting and saving water.Protecting and Saving Water
8、Water is very important to human beings, but not everybody knows how to protect and save it. Here are some ways:1. Pass laws against water pollution.2. Stop factories pouring waste water into rivers.3. Remember to turn the top off when you leave.4. Collect and reuse waste water. 【点击播放点击播放点击播放点击播放】Ex
9、planation1. The wind is blowing strongly with lots of sand. 风中夹着大量的沙，疯狂地刮着。风中夹着大量的沙，疯狂地刮着。sand 沙，沙子，不可数名词。沙，沙子，不可数名词。 如：如：much sand 许多沙许多沙a grain of sand 一粒沙子一粒沙子【拓展拓展】 sand 沙子沙子 如：如：Children are playing on the sand. 孩子们正在沙滩上玩耍。孩子们正在沙滩上玩耍。2. People have cut down too many trees. 人们砍伐了太多的树。人们砍伐了太多的树。c
10、ut down 砍伐，砍伐，down为副词，代词作宾语时，为副词，代词作宾语时，要放中间。要放中间。 如：如：Trees are very useful to us. We shouldnt cut them down.树木对我们很有用，我们不应该砍伐它们。另外，另外，cut down还是还是“降低，减少降低，减少”的意思。的意思。 如：如：The article should be cut down to 1000 words.这篇文章应该缩减到一千字。3. Trees can stop the wind from blowing the earth away. 树能阻止风把土壤吹走。树能阻
11、止风把土壤吹走。stop . from doing sth. 意为意为“阻止阻止做某事做某事”，相当于，相当于prevent . from doing sth.和和keep . from doing sth.。如：。如：You cant stop us from going if we want to. 倘若我们要去倘若我们要去, 你是阻止不了的。你是阻止不了的。4. And a lot of water can be saved by forests. 森林可以贮存大量的水分。森林可以贮存大量的水分。be saved 为被动语态结构。为被动语态结构。save此处为此处为“贮存，贮存，保留，保
12、存保留，保存”的意思。的意思。 save作动词时，还有作动词时，还有“挽救挽救”和和“节约节约”的意思。的意思。 如：如：Its a doctors duty to save patients lives. 挽救病人的生命是医生的职责。We must save every drop of water. 我们必须节约每一滴水。【链接链接】5. Cutting down trees is harmful to human beings, animals and plants. 砍伐树木对人类、砍伐树木对人类、动物和植物是有害的。动物和植物是有害的。动名词短语动名词短语cutting down tr
13、ees在句中作主语。如：在句中作主语。如：Watching TV too much is bad for your health. 看太多的电视对你的健康有害处。although用作从属连词，意为用作从属连词，意为“尽管（虽然）尽管（虽然）但是但是”，表示让步关系。，表示让步关系。although是用来引导是用来引导让步状语从句的让步状语从句的“特征词特征词”。如：。如：Although he is a boy of nineteen years old, he knows three foreign languages.6. Although we have built “the Great
14、 Green Wall”, we still need to work hard to protect the environment. although引导的让步状语从句较正式，多置于引导的让步状语从句较正式，多置于主句前，有时也可置于主句后。如：主句前，有时也可置于主句后。如：Although they were tired, they went on working in the field.although表示表示“虽然虽然但是但是”，它不能与，它不能与but连用，在同一个句子中，用了连用，在同一个句子中，用了although就不能再用就不能再用but。正如用了。正如用了because
15、就不再用就不再用so一样，以避免重一样，以避免重复。不过，复。不过，although可与可与yet或或still一起使用。如：一起使用。如：Although he lives alone, he is happy. / Although he lives alone, yet he is happy. / He lives alone, but he is happy. （1）although相当于相当于though，是从属连词，引导，是从属连词，引导让步状语从句，在非正式语体中让步状语从句，在非正式语体中though使用较为普使用较为普遍，但是它也不能与遍，但是它也不能与but连用，不过也可
16、以同连用，不过也可以同yet, still连用。在倒装句中常用连用。在倒装句中常用though。如：。如：【相关链接相关链接】Young though he is, he is quite experienced. （2）even though意为意为“虽然；即使虽然；即使但是但是”，相当于，相当于even if。though常与常与even 连用，但连用，但although不能。不能。Exercises1. I dont want to have a rest _ Im tired.A. because B. although C. but D. so2. Parents should pr
17、event the children _ taking medicine by themselves.A. about B. with C. from D. of3. Neither the government nor any official is _.A. by law B. under law C. above the law D. obey the lawCBC单项选择。单项选择。4. _ we were quite tired, _ we still went on working. A. Although; / B. Because; / C. Because; go D. Although; but5. My hometown has changed _ a new one in the last three years.A. in B. to C. with D. intoDA(1) Find out more information about water. (2) Write a short passage with the title “Protecting and Saving Water”. Homework
