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通过对节能环保知识的复习讨论，导入新课，教学部分生词。
1. (通过对上一课1a的复习，强调怎样做才能成为绿色使者, 进一步增强学生的环保意识，同时也营造一种英语氛围，激发学生的学习兴趣。)
T: Can you remember what we have learned in Section B?
Ss: Yes. (教师可以出示上一课1a的图片。)
T: What are Jane and Michael doing?
Ss: They are talking about how to be a greener person.
T: Can you tell me how to be a greener person? Ss: First, turn off the lights when we leave a room.
T: What about the next?
Ss: Walk or ride a bike instead of taking a bus or a taxi …
T: Very good. Please go on.
Ss: Take a cloth bag when we go shopping.
T: Great. It’s easier said than done. So we have to keep on doing that every day.
2. (让学生分组讨论节约能源的各种方法，以旧带新，导入新课主题。) T: We must not only protect our environment but also save energy like electricity. Now discuss this problem in pairs: What should we do to save energy? (采用竞答方式，鼓励学生说出日常生活中所观察到的节约能源的各种方法。)
T: Well, I’m sure you have some new ideas to save energy. Please tell me one by one. Now let’s talk about how to be a greener person. Who’s the volunteer? Please hands up!
S1: Don’t drive a car if you travel a short distance.
S2: Write on both sides of the paper. S3: Don’t use the things that can be used only once.
S4: After we wash faces, we can use the water to wash clothes.
S5: Take a cloth bag when we go shopping.
S6: Turn off the TV set while we are away.
S7: … T: Well done! Actions speak louder than words. If you want to be a greener person, you should do as what you say.
3. (通过学生对节能环保知识的讨论，教师引出文中所讲的新环保事物，出示1a的挂图，导入新课内容，教授生词。)
T: Look at the pictures. Maybe they are the new things that you haven’t known. They show us some forms of energy. Some of them may do less harm to our environment. What’s it in Picture a?
Ss:It’s a car.
T: Yes. What a beautiful car! But it looks strange, doesn’t it?
Ss:Yes.
T: It’s an electric car. It works well, but it’s slow and can’t run for long.
(板书并讲解，要求学生掌握。) electric (adj.) — electricity (n.)
T: What’s it in Picture b? Who knows it?
S8:It’s a train. It can run fast.
T: You’re right. It’s a maglev train. Its advantages are quiet, fast and clean, but it’s too expensive. (板书并解释，要求学生理解maglev train。) maglev train