1、Unit 2 Saving the Earth（教案）Topic 2 All these problems are very serious. Section BThe main activity is 1a. 本课重点活动是1a。. Teaching aims and demands 教学目标1. Learn some new words and phrases:sand, cut down, change into, prevent, prevent from, human being, although, law, turn off2. Learn some useful sentenc
2、es: (1) Trees can stop the wind from blowing the earth away. (2) Pass laws against water pollution. (3) Remember to turn the tap off when you leave.3. Learn to talk about pollution and its harm. Teaching aids 教具幻灯片/录音机/图片. Five-finger Teaching Plan 五指教学方案Step 1 Review 第一步 复习(时间:3分钟)复习污染的类型及其危害，教师创设一
3、个空气污染的情境，引入本课话题。1. (教师收集一些有关污染的图片如noise pollution, air pollution ,water pollution，让学生说出它们分别属于哪种污染，有何危害并提出解决建议。)T:What kind of pollution is it?Ss:It is noise pollution.T:What harm can it cause?S1:It can disturb others and make people feel uncomfortable and unpleasant.S2:It does great harm to peoples
4、hearing. It can even make people sick or deaf.T:Good. How should we solve this problem?S3:Dont always listen to loud pop music.S4:Dont make a loud noice in public.Step 2 Presentation 第二步 呈现(时间:20分钟)通过多媒体呈现1c中的图片，创造情景对话，呈现新单词和词组，学习1a。1. (呈现1c中的图片，学习新词汇。)T:Look at Picture 2 in 1c.T:(指着第二幅图。) Is the sc
5、enery beautiful?Ss:Yes.T:OK. Lets look at Picture 4. Is it beautiful?Ss:No.T:What has happened to the forest?Ss:It has gone.T:Yes. People have cut down too many trees.(要求学生掌握。)cut downT:Please look at Picture 1. A lot of earth has been washed away. Why?Ss:Because people have cut down (教师引导学生回答。)T:Th
6、ats right. Trees can prevent the water from washing the earth away.(要求学生掌握。) preventfrom=stopfromT:Lets look at Picture 3. Oh, my goodness! The forest has changed into desert.(要求学生掌握短语change into；理解desert。) change intodesertT:Please look at Picture 5. Whats the weather like?Ss:Its bad.T:I agree with
7、 you. The wind is blowing strongly with lots of sand. We call it sandstorm.(学生掌握sand；了解sandstorm。)sandsandstormT:Is cutting down trees good or bad for us?Ss:Its bad.T:Very good. Its harmful not only to human beings, but also to animals and plants.(要求学生理解。) human beingT:So what can we do to protect t
8、he environment? Discuss in groups of four.(给学生两分钟，让他们讨论。)S1:Plant more trees.S2:Stop cutting down trees.S3:T:Good idea. Although we have done a lot to protect the environment, its not enough yet. Lets work harder.(要求学生掌握。) although2. (让学生小组讨论完成1c。)T: Do you know the relations between trees, human be
9、ings and sandstorms? Do you know how sandstorms come into being? Now please look at the pictures in 1c and number them. (核对答案。)3. (听1a录音回答问题。)T:Just now we talked about how sandstorms come into being. Now listen to 1a, and answer the questions on the screen. (1) What are they talking about ? (核对答案。)
10、4. (再听1a录音选出最佳选项。)( ) 1.What is the weather like ? A. Its sunny. B. Its rainy. C. Its windy. ( ) 2.What cause these sandstorms? A.People use chemicals too much in the fields. B.People have cut down too many trees . C.People pour waste water into rivers.( ) 3. As a result, a lot of rich land has chan
11、ged into . A. desert B. river C. forests ( ) 4. Cutting down trees is harmful to . A.human beings B.plants C.human beings ,animals and plants(核对答案。) 4. (再听1a录音填空。) Trees functions A. Trees can the wind the earth away .B. A lot of can be by forests .C. Trees can the water the earth away .(核对答案。)Step
12、3 Consolidation 第三步 巩固(时间:5分钟)教师放1a录音，学生表演朗读，完成1b。让学生明白树木在环境保护中的重要性，增强环保意识。1. (让学生跟读1a录音，并注意语音语调。)T:Now, please read after the tape. Pay attention to the pronunciation and intonation. 2. (让学生三人一组表演这个对话，稍后检查活动成果。)T:Please work in groups of three. After a while, Ill ask several groups to act out this
13、dialog. G1: G2: Step 4 Practice 第四步 练习(时间:7分钟)1、讲解语法点：Stop/prevent +sb./sth.+(from) doing sth.阻止某人或某物做某事Lucys parents stop her (from) playing computer games .露西的父母阻止她玩游戏 。2、让学生用着个语法点造句S1S2S33、Retell 1aHere are some key words for students.blow strongly ,cause sandstorms ,cut down , change into , stop
14、from , prevent from , be harmful to , Step 5 Project 第五步 综合探究活动(时间:5分钟)DiscussionHow to prevent the sandstorm?Here are some ways:1. Pass laws against air pollution.2. Dont cut down too many trees and plant more trees .3. We should try our best to protect our environment. .SummaryNew words and phrase
15、s:sand , sandstorm , cut down , change into , desert , prevent , prevent from , human being , although , law , turn off , tapUseful expressionsPass laws against water pollution.Trees can stop the wind from blowing the earth away.Remember to turn the tap off when you leave. HomeworkWrite a short passage with the title “How to prevent the sandstorm?”4 / 4
