Unit2SavingtheEarth.docVIP

Unit 2 Saving the EarthTopic 1 Pollution causes too many problems.Section A激趣导入：回顾第一单元有关家乡变化的内容，复习现在完成时态，导入新课。通过对第一单元的复习，导入被污染的西山景象。T:Last unit, we have learned some changes in our hometown. Can you say some?S1:The roads are wider. S2:The buildings are higher and higher.S3:The living conditions have improvedS4:T:Yes. Many changes have happened in our hometown. Lets look at the two pictures about the West Hill and discuss the changes between them.知晓目标：1. Learn some new words and phrases:bee, my goodness, waste, stream, breathe, be harmful to, influence 22. Learn and talk about different kinds of pollution:(1) Air pollution makes people sick. (2) Light pollution is harmful to eyes. (3) Litter influences our environment. 3. Learn some useful sentences:(1) Oh, my goodness!(2) Look, there are several chemical factories pouring waste water into the stream.44. Learn direct speech and indirect speech:(1) Kangkang said that it was a beautiful place with lots of flowers and grass.(2) Kangkang said that the flowers and grass had gone.自主交流：通过比较1a的两幅图画的差异，展开对话，学习部分生词，呈现1a。1. (利用幻灯片展示1a中的两幅图，师生问答。)T:Are there any differences between them? Ss:Yes. T:Lets look at Picture 1. What can you see? S1:I can see some flowers and grass. T:What else can you see? S3:I can see a rabbit. T:(指着蜜蜂。)Whats it?Ss: Its a bee./Sorry, I dont know.T:We know the West Hill was a beautiful place. Look at Picture 2. Oh, my goodness! What has happened to the West Hill?T:(指着工厂。)Yes, there are several factories. They are chemical factories.T:(指着工厂排放出的黑烟，并捂住鼻子做呼吸困难状。) They are making much smoke. It can cause breathing problem.T:From Picture 2, we know the chemical factories are harmful to the animals and plants. 2. (要求学生不看书，只听录音，捕捉要点，回答问题，从而提高听力水平。)T:Close your books. Listen to the tape carefully, then answer the questions. (出示小黑板上的问题，听录音1a。)(1)Where are they going to have a picnic?(2)Why does Kangkang say “Oh, my goodness!” ?3.复述1a，引入本课重点，讲解和操练“直接引语”与“间接引语”，完成1b。(要求学生在限定时间内，根据黑板上的关键词复述对话。)T: Try to retell 1a. You can use the key words on the blackboard and the pictures about West Hill.Example: In the past, the West Hill was a beautiful place with flowers and grass. We could see bees and butterflies dancing. The air was fresh, the water was very clean and we could see fish swimming. But now, all the flowers, grass, bees, butterflies and fish have gone. The water is so dirty and it smells terrible. Why? Because there are several chemical factories pouring waste water into the stream. So we should protect the environment. (引入语法“直接引语”和“间接引语”。要求学生根据1a回答教师的问题。并要求学生将板书与1a中的原句对比找出不同之处，教师引导和补充。学习“直接引语”和“间接引语”。)Kangkang said that he had been there before.Kangkang said that it was a beautiful place with lots of flowers and grass.Kangkang said that the air was fresh and the water was clean, and they would see 让学生完成1b，并作报告。T: Fill out the table in 1b, then give a report, using “Kangkang/Maria said ”.合作学习：通过听力训练，引出污染的概念，充分调动学生的积极性，加深对各种污染及其危害的理解，完成2, 3a和3b。1. (播放2录音，学生听后完成2。)T: We know, without plants and animals, the West Hill isnt beautiful. So plants and animals are important. Lets look at the lovely animals in the pictures in 2. Listen to the tape and write down the numbers of the correct pictures. (若学生没听懂，可再放一遍，核对答案。)2. (学生看图完成3a。)T:After listening, do you know what does great harm to animals?Ss:Pollution.T:Yes. Therere many kinds of pollution. Lets look at the pictures in 3a and match them with the phrases given. Try to guess the meaning of soil.3. (让学生用3a的短语完成3b。) T: Pollution has caused many problems. What problems has it caused? Please complete 3b with the phrases in 3a.通过游戏及调查的方式，加深学生对污染及其危害的印象，增强学生的环保意识。1. Guessing games. (教师让一学生到讲台，从3a所提供的有关污染的图片中任取一张，正面面向全体学生，背面面向自己。台下学生描述图片上的内容或引起的污染问题，让台上的学生猜出该种污染的名称。)T: Every one of you can describe the picture. And the student in the front of the classroom tries to tell us what kind of pollution it is. Example:(S1任意抽取一张图片。)S2 : Its produced in a factory. (教师帮助学生描述。)S3 : It smells terrible. S4 : Its harmful to our lungs. S5 : Its black smoke. 建构知识体系：Pollution causes too many problems.Section Aair pollutionthere be sb./sth. doing sth.soil pollutionbe harmful to water pollutionKangkang said that it was a beautifullight pollutionplace with lots of flowers and grass.noise pollutionlitter学情检测: Make a s