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3.课件展示英语，让学生读并说出汉意。
4.Show the pictures and check words and expressions.
The water is .
Water ___________ is very serious now.
Don’t _________ water.
It’s ________________ to throw away the food.
The machine can _____________ the bottles.
The bottles can __________ by the machine.
设计意图:通过跟读读、听读、组内互查，让学生养成自主预习的习惯熟悉单词。通过英译汉，完成句子帮助学生记忆新词，为接下来的学习扫清词汇上的障碍。
二、课内导航：
Step 1：Lead-in
1.Show the learning aims.
2.What can you see?
向学生展示一些有关环境污染的照片，向学生介绍提问
T：What can you see ?
For example: We can see a very dirty river. There is lots of rubbish. The fish died because of the water pollution.
然后，再展示两张图片，让学生自己讨论。
设计意图：给学生展示一些图片可以让学生更直观的了解到环境污染的现状，激发学生对污染的憎恶和对本课学习的积极性。
Step2：While-listening
课文前先听：Listen and complete the sentences：
1）The factory is causing a lot of __________.
2）There should be some ________ to stop the pollution.
3） We can ________ waste products, such as ________ and paper in a recycling centre.
一听：Lingling and her friends are talking about pollution. Listen to the conversation and find out what polluted the environment.
Cars factories
二听：在前两听的基础上，让学生完善表格，Listen again and complete the notes.
What the students can do ？
Support a green school: every class ___________ which can be ___________________. Then the school _____________to help students ____________________
2）Students learn _____________________________. That means __________.
三听：Listen and complete the passage with the correct form of the words in the box.