约1820字。

　　仁爱版九年级英语上册Unit 2
　　Topic 2  All these problems are very serious.
　　Section C
　　The main activity is 1a. 本课重点活动是1a。
　　Ⅰ. Teaching aims and demands
　　1. Learn some new words and phrases:
　　on earth, period, millions of, take away, rise, level, refer to
　　2. Learn some useful sentences:
　　(1) When it rains or when the wind blows, the earth is taken away.
　　(2) The heat from the sun can’t escape so the temperature is rising.
　　3. Learn to talt the harm of pollution:
　　(1) Forests have become deserts, so more and more sorts of animals and plants are disappearing.
　　(2) As a result, many rivers and lakes are now dead.
　　(3) Too much harmful radiation from the sun passes through the hole and reaches the earth directly.
　　(4) It causes the level of the oceans to rise and the climate of the earth to change.
　　4. Develop the students’ sense of environmental protection.
　　Ⅱ. Teaching aids 教具
　　图片/小黑板
　　Ⅲ. Five-finger Teaching Plan
　　Step 1  Review
　　通过检查作业，引导学生开拓思维，提出保护环境和水资源的具体措施，复习不定代词和副词。为学习新词汇作准备。
　　(检查作业，并找学生汇报结果，引导学生如何保护水资源。)
　　T: How do you protect our environment and save water?
　　S1: Everyone should plant more trees.
　　S2: We should do everything we can to save water.
　　S3: Everybody should know the importance of forests.
　　S4: Pass laws against water pollution.
　　S5: Collect and reuse waste water.
　　…
　　Step 2  Presentation
　　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: What’s the weather like today?
　　Ss: It’s …
　　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。)