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S: No, it’s dirty.
……
T: What can you feel about the pictures?
S: …
T: Yes. There are so many bad things. Who did these bad things?
Ss: People.
T: What do you want to say to these people?
Ss: …
T: Yes. We should protect the Earth, right?
Ss: Yes.
T: So today we’re going to learn Unit 7 Protect the Earth.
(揭题，带领学生读课题)
T：出示学习目标（学生了解目标）
自学提示（一）细读Story time 课文，找出不会读，不理解的单词，短语和句子，在小组内互助互学，
可以向老师请教。
Think and say
T: Look, this is the Earth. What do you know about Earth?
Ss: …
(展示地球多年前的一幅图和地球现在的一幅图，让学生比较后总结)
T总结: Look, the Earth is not as beautiful as before. So let’s be the green guards to protect the Earth. OK?
Ss: OK.
T: How can we become green guards? Look, here are some steps.
课件展示展示成为环保小卫士的步骤：
We know how to protect the Earth from some parts
We know the use of them
We know the problems of them
We know the solutions of the problems
We can talk about protecting the Earth
T: OK. Let’s go.
自学提示（二）快速阅读课文，为四段文本各写一个标题。（2分钟）Tip:注意抓取每段中的关键词。