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四、教学准备
PPT, 板书，图片教学环节教师活动学生活动设计意图Pre-readingEnjoy a video.
Guide Ss to say what they see.
2.Q:What makes the earth dirty?
1. Enjoy a video .
Review: The man is…
The city is…
The animal is…
2. What makes the earth dirty?(discuss in groups)
makes dirty.
___makes___ messy.
___makes___ dead.
___makes_____ _____.
利用视频引入本课情境,帮助学生集中注意力，思考：什么引起环境污染。
直接进入本课的主题,借助图片和动画，在师生的问答互动中教学本课的句型。
让学生初步感知where的两个不同句型，并尝试运用。While-
reading1. Listen and Fill
Q:What makes our city dirty ?
2. Watch and check
Q:What makes our city dirty ?
3. Check and retell
Q:What makes our city dirty ?
4. Let’ talk.
Q2:Who/What keeps our city clean?
请围绕话题，四人一小组讨论
Who took the white cap?
5. Read and underline
自读课文，划出建议
Q3:What can we do to keep our city clean ?
(1) enjoy the vedio