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【课前准备】
收集有关环境污染的资料。
┃教学过程设计┃
一、创设情境，切入主题
Step 1：Lead in
1.Ask students to enjoy a video named Gone?with?Home.
2.After watching the video，ask students the following questions.
What’s the video mainly about?
How do you feel?
3.Ask students to discuss one question with their partner：
In our daily life，what kind of pollution can you think of?
设计意图：通过视频《留住美丽地球》，震撼学生的心心灵，帮助学生了解环境污染及生态破坏的种种现象，并使他们意识到环境保护的危机感与紧迫感。同时，联系身边生活，结合本城市环境状况，引导学生进一步熟悉话题。 二、展开过程，探究新知
Step 2：Presentation
1.Ask students to look at the pictures in 1a and talk about it.
2.The teacher can ask students the following question: What else can cause each kind of pollution？Then ask students to do the exercise in 1a.
设计意图：让学生对于环境污染的类型有一个初步的了解，熟悉话题，为下面的听力活动做好内容和词汇上的准备。
Step 3：Listening to 1b
Before listening
Ask students to predict what kind of pollution they will listen to in 1b.
设计意图：从内容和语法上对听力进行预测。
While listening
1.Play the recording twice for students to complete the chart.
2.Ask a student to read his or her answers.
3.Let students check their answers that they have predicted.
设计意图：听这两遍时，更加注重细节。
After listening
1.Read after the tape recorder and pay attention to the pronunciation and intonation.
2.Ask students to practice the conversation with their partner.Then，ask students to act out the conversation.
3.Ask students to make their own conversation and act out the conversation.
设计意图：听后，再次整体回扣文本，并进行语音语调的学习。然后，通过pair work让学生内化听取的信息语言。