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能运用所学词句复述或表演课文章节
教学过程：
Step 1 Lead-in
Enjoy a song: Two little blackbirds
Free talk:
Do you like birds?
Can you see any birds in our city Taixing?
Why no birds here?
3.Look at some pictures.新授：messy dirty
揭示课题：Keep our city clean
Step 2 presentation and pratice
T: Taixing is now establishing National Civilized City.
Task1: To know what makes our city dirty.
Task2: To know what can we do to keep our city clean.
Task3: Make a green plan .
Task1: To know what makes our city dirty.
（1）Watch and choose: What makes our city dirty?
（2）Read and finish:
1. __________________________makes the air dirty.
___________________________makes the air dirty, too.
2.__________________________makes the streets dirty.
3. __________________________makes the fish dead.
在核对答案时相机教学单词：smoke，air，messy，rubbish，dead
Task2: To know what can we do to keep our city clean.
1.Read silently （默读）and underline( 划线).
2.Play a game: quick response .
Rules:
如果你看到的词组是有利于环境的，请说“YES”并把它读出来。
如果你看到的是有害环境的，将手交叉于胸前，并说“NO”。
3. Reading time : 一人扮演老师随机点名读，语音语调优美者获 得一枚印章。