Step 1情景导入
The teacher show a photo of polluted river.
T:What can you see in the photo?
S1:I can see polluted water.
S2:I can see a dead river. There are no plants, no fish or living things.
T:Pollution is very serious. Pollution is a danger to our health. We must do something to save our earth.
S2：What can we do for it？
T:We can collect waste paper or rubbish which can be recycled or used again. We can also turn off lights to save energy when we don\'t use them…
Ss:That\'s easy. We will do them.
Step 2完成教材Activities 1~3的任务
1.Work in pairs. Look at the pictures and talk about them. Use the words in the box to help you. (Activity 1)
(1)处理生词。教师可以领读方框中的词，并让学生试着用这些单词描述图片。
(2)学生活动：学生利用已有词汇和方框中的单词描述图片，然后教师引导学生自由发挥，谈论有关污染的问题。教师可以通过提问引导学生用相关词汇问答问题 例如：
What may cause pollution? How do many of the factories pollute the air and rivers?
(3)教师请学生展示。
2.Listen and complete the sentences. (Activity 2)
(1)学生个体活动，听录音，补全句子。
(2)全班核对答案。
（答案:1.pollution 2.rules 3.recycle; glass)
3.Listen and read.Now complete the notes. (Activity 3）
(1)教师给出一两个简单的问题，例如：
Why is Lingling worried about the future?
Why is pollution a danger to our health?
What do you think may cause pollution?
(2)学生合上书，听录音。回答问题。
(3)学生再次听录音，要求学生能获取对话中的细节信息，完成活动3中的练习。
(4)学生两人一组或小组活动，核对答案。
(答案:1.farmers can\'t use the water for their crops
2.spreads over cities and villages 3.use so much oil and cause pollution 4.collects waste; recycled or used again; sells the waste; in poor areas
5.ways to save energy and recycle at home; less waste)
(5)学生打开书，跟读或朗读对话。
环节说明:本活动呈现新的语言内容,训练学生听懂主旨大意和获取细节信息的能力。
