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教学重难点：
To learn to talk about how to live a green life
教学过程：
Step 1 Warming up
Watch a video.
Did you know t hat al l around the world, 3 to 6 billion trees are cut down each year? Have you ever planted a tree?
【设计意图：让学生通过观看视频和图片，为下文谈污染做铺垫。】
Step 2 Presentation
Show some pictures and present the new words.
by showing some pictures , talk about what a green life is.
【设计意图：通过看图片和讨论，让学生初步讨论绿色生活是什么样的，并学会使用do sth. by doing sth.来表达自己的想法。】
Step 3 Practice
1. Do Part A on page 117.
2. Check the answers.
Step 4 Listen and answer
1. Listen to part B and answer the following questions.
1) How did Kitty go to school in the past?
2) What about now?
2. Read after the recorder.
Step 5 Free talk
Work in groups and talk about the ways to live a green life.
A: What should we do to live a green life?
B：…used to…, but now…
A: I agree. It’s wise for …
B: I think …
A: Yes…
【设计意图：通过讨论，学生对自己或自己身边的破坏环境或浪费资源的行为有了较深的认识，并且引出植树话题，使学生很快进入漫画的学习中。】
Step 6 Learn the conversation
1. Listen to the tape and ask:
1) What is Hobo going to do?