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激起学生保护地球资源的共鸣。
培养学生热爱地球家园的情感。
培养学生相互合作学习的意识。
二、教学重点：
1学生了解保护地球的途径及方法，并能用英语给出评价；
2在复习巩固中理解并运用3R原则，并能用来组织各种实践活动。
三、教学过程
Before class
Yesterday you did some homework. Some of you did good job. Let’s watch a video. 微视频展示学生课前用废弃料制作好的手工作品.（设计意图：通过学生课前制作的这些手工制作品，培养学生动手能力的同时也培养了他们的创造力，又传递了生活中我们也可以“变废品为艺术品”的环保理念。）You have many creative ideas. Big hands for these boys and girls.
（一）． Warming up
Greetings
Free talk
I’m very happy today. Do you know why? Guess. (突出以学生为主体，学生思考问我)
Yes, I meet some old friends.
．Learn about 3R
T: Today, I bring an animal friend, Pinch, a pack rat.一只收纳鼠。（板书图片） He’s not happy. Why? Let’s listen.
Pinch: Hello, boys and girls. I'm Pinch. I like keeping everything. I keep old magazines, clothes, toy cars, boats, tools and books and games... So, my house is....
T: What do you think of Pinch’s house?
S1: Pinch’s house is messy and dirty（设计意图：通过听和看的方式让学生有一个直观印象谈感受）
3R---reuse
T：Let’s go on listening.
Pinch: Too many things make my house messy and dirty, how can I do? Can you help me?
T: What can Pinch do with those things? (设计意图：通过Pinch 家又脏又乱的画面引发学生的深度思考，各抒己见，以最终老师引入如何变废为宝。）
S: …
T: The best way is to reuse them, do you think so? S: Yes!
T：What does Pinch say this time? Listen.
Pinch: Thank you, my friend, but what does ”reuse” mean?
T: what does ”reuse” mean? (板书课题reuse)
S: It means we can use the thing again.
T: What can we reuse? Now talk in groups and then write them down on P88. Go.