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四、通过谈论环境污染，学生能培养自己的环保意识。做到：保护环境，从我做起，从小事做起。
Difficulties：能正确运用现在进行时态，used to结构，现在完成时态， 被动语态和情态动词谈论环境污染和环境保护。
【Teaching steps】
Before listening
Warm-up and revision（课堂热身和复习）
Look at the pictures and answer the question:
What are they about?
How many kinds of pollution do these pictures show?
教学设计说明：创设情景，导入新课。
While listening
Presentation（呈现新知识）
Work on 2a.
Listen to Jason and Susan talk about pollution.
Then circle the kinds of pollution that they talk about.
听第二遍录音，判断下面句子的正、误。
1) Jason thinks that the air is badly polluted. ( )
2) Susan used to see the mountains clearly. ( )
3) People are also littering in public places. ( )
4) They think that they can do nothing to help. ( )
5) They are talking about the noise pollution. ( )
教学设计说明:通过听—模仿—自主对话，进一步巩固本课功能句。
3. 观察与思考
1) Jason thinks that the air is badly polluted.
2) Susan used to see the stars clearly.
3) People are also littering in public places.
观察上面的黑体字内容，它们分别对应了几种时态或语态？
4. Work on 2b.
Listen again and complete the sentences.
The air is badly polluted because there are _______________ on the road these days.
Factories that burn coal also ____________ the air with a lot of black smoke.