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1、Unit 2 Saving the EarthTopic 2 All these problems are very serious.Section BThe main activity is 1a.本课重点活动是 1a。I . Teaching aims and demands教学目标1. Learn some new words and phrases: sand, cut down, change into, prevent, prevent from, humanbeing, although, law, turn off2. Learn some useful sentences:(
2、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. Continue to learn the indefinite pronoun and adverb.4. Learn to talk about pollution and its harm.n . Teaching aids 教具幻灯片/录音机/图片田.Five-finger Teaching Plan
3、五指教学方案Step 1 Review 第一步 复习(时间:5分钟)通过方格游戏，来复习不定代词和不定副词的用法。(让同桌两人做一个 3X 3的方格，将上节课 Section A中2的10个不定代词(everyone 和everybody任选其一)放入方格中。教师事先准备九道练习题，答案就是方格中的九 个不定代词。教师将这些习题逐一呈现出来，同桌两人抢圈答案，谁抢到的多谁获胜。在此过程中，教师每呈现一题核对一次答案。)(供参考)(表格及习题如下：)noneothersomethingeveryone fverybod/ * ynobodyanythingeverywhereanybodyoth
4、ers(1) None of us knows how to stop the bad behavior.(2) I knocked on the door but nobody answered.(3) Some of these books are better than others. (4) She was driving the car with one hand and wiping the window with the other.(5) They are beautiful but I am looking for something useful.(6) You can t
5、 believe anything she says.(7) There re 5 000 people living here and almost everyone/everybody has his/her own car.(8) He s cleverer than anybody I know.(9) I ve looked everywhere but I can t find it.Step 2 Presentation 第二步 呈现(时间：15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
6、 Picture 2 in 1c.T:(指着第二幅图。)Is the scenery beautiful?Ss: Yes.T: OK. Let s 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.（板书并要求学生掌握。一）cut downT: Please look at Picture 1. A lot of earth has been washed away. Why?
7、Ss:Because people have cut down（教师引导学生回答。）T: That s right. Trees can prevent the water from washing the earth away.（板书并要求学生掌握。）一prevent from=stop fromT: Le t s look at Picture 3. Oh, my goodness! The forest has changed into desert.（板书并要求学生掌握短语change into ；理解desert 。）change into desertT: Please look
8、at Picture 5.Ss:It s bad.What s the weather like?T: I agree with you. The wind is blowing strongly with lots of sand. We call it sandstorm.（板书并要求学生掌握sand; 了解sandstorm 。）sand sandstormT: Is cutting down trees good or bad for us?andSs:It s bad.T: Very good. It s harmful not only to human beings, but a
9、lso to animals plants.（板书并要求学生理解。）human beingT: So what can we do to protect the environment? Discuss in groups of four. （给学生两分钟，让他们讨论。）Si： Plant more trees.S2: Stop cutting down trees.S3：T: Good idea. Although we have done a lot to protect the environment, itt s work harder.）not enough yet. Le （板书并
10、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 beings 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
11、, and answer the questions on the blackboard.（板书）（1） What s the weather like today?（2） What should we do to protect the environment?（核对答案。）4 .（让学生分成小组，读1a,提出不懂之处。小组内讨论，解决各自提出的问题；最后 全班共同讨论，解决遗留问题。用此方式可以让学生充分参与到教学过程中来，进行 自主探究学习，教师做补充讲解。）T: OK, please work in groups. Find and talk about the language po
12、ints and difficult points, then I ll ask some students to give their answers to the class.Step 3 Consolidation 第三步 巩固（时间：8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
13、后检查活动成果。）T: Please work in groups of three. After a while,I ll ask several groupsto act out this dialog.G:G:3 .（让学生看1b的图片，完成1b。）T: Let s look at the picture in 1b. Make notes of trees functions according to 1a by yourselves.（学生完成后，让学生一个接一个地把答案读出来。）T: Please read your notes one by one.Si：Step 4 Pract
14、ice 第四步 练习（时间：10分钟）教师展示一幅水被污染的图片，呈现2中的新词汇。让学生懂得怎样保护和节约水资源。1. T:Now we know that a lot of water can be saved by forests. Why should wesave water?55: Because it is very important.T: That s right. We can t live without water. So we should protect water.（展示一条被工厂污染的河的图片，引出 2中的新词汇。）T:Look at the picture.
15、Can people drink the water in the river?Ss:No.T:Why?56: Because the wateristoo dirty.T:What causesit?57: Factories arepouringwaste water into the river.T:Good. What can we do to stop it?Si：Pull down the factories.S2：Write to the newspaper or the government.S3：T: Very good. Wecan stop factories pouring waste water into rivers by cuttingoff their water supply. And we can also pass laws against it.（板书并要求学生掌握。）一lawT: Do you know some other ways of protectin
