unit 2 topic 2 all these problems are very serious》section c 开学必备教学设计 仁爱版九年级上
5页1、九年级英语上册 Unit 2Topic 2 All these problems are very seriousSection C 教学设计 仁爱版The main activity is 1a. 本课重点活动是1a。Step 2 Presentation 第二步 呈现(时间:18分钟)教师通过日常对话,借助1a中的图片,创设情景,导入新课,呈现新的词汇。1. (教师由日常对话,引出本课话题,呈现部分新词汇。)T:Whats the weather like today?Ss: Its T:As we know, Beijing often has sandstorms in spring. What causes the bad weather?Ss:Cutting down too many trees. (展示1a第二幅图画。)T:Yes. All over the world, people have cut down millions of trees. And trees become fewer. (板书并要求学生掌握。) millions ofT:Cutting do
2、wn too many trees causes the bad weather. How can trees affect the weather?S1:They can keep water from running away. S2:They can stop S3:T:Yes. Trees can stop the wind and water from taking the earth away.(板书并要求学生掌握。)take away2. (继续探讨上述问题,引出新词汇。)T:Anything else?(如果没有学生回答,继续如下问题。)T:Whats the air like in the forest?Ss:Its fresh.T:Yes. Why?Ss:(允许学生用汉语回答。)树能吸收二氧化碳并释放氧气。T:Thats right. Trees can breathe in carbon dioxide and breathe out oxygen.(展示1a第五幅图。)Please look at the picture.(板书并要求学生理解。)carbon d
3、ioxide: CO2oxygen: O2T:Where does CO2 come from?S4:Animals breathing.S5:Burning oil. For example, cars and buses.T:Yes. They have polluted the air. Carbon dioxide in the air has increased a lot. This has formed a “blanket” around the earth.(板书并要求学生理解。)blanketT:The heat from the sun cant escape, so the temperature is rising.(板书并要求学生掌握rise;理解escape。) escaperiseT:This is called “the greenhouse effect”.(板书并要求学生理解。) the greenhouse effectT:What happens to the icebergs(冰川)?Ss:Some parts of them change
4、into water.T:So it causes the level of the oceans to rise.(板书并要求学生掌握。) levelT:(展示1a第4幅图。)Please look at this picture. Around the earth, theres a special kind of oxygen called “ozone”.(板书并要求学生理解。) ozone: O3T:But now air pollution is destroying it and that has made a very big hole in the ozone layer.(板书并要求学生理解。) ozone layerT:Too much harmful radiation from the sun passes through the hole and reaches the earth.(板书并要求学生理解。) radiation3. (让学生快速阅读1a,用所给的词组填空。完成1a。) T: We humans have lived on earth for
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