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Ask: What is the earth like in the past?
Ss: The air is fresh, the water is clean ,everywhere is green ,the earth is beautiful.
T: What does the earth look like?
Ss: The earth is dirty, the water is polluted, the fish in the river has died.
T: Why is the earth like this?
Ss: The factory pour the dirty water into the river ,and throw the litter into it.
Step 2.Presentation
1Open your books of page 97.Listen to the tape and fill in the blanks.
2Check the answers.
3.Students say something about pollution using the expressions of this part.
4.Know about the pollution is serious ,and know about the kinds: noise pollution ,air pollution, water pollution.
Step 3.Practice
Look at the courseware ,read the sentences in the screen, and translate into Chinese.
Use the key words to make sentences.
Role-play the conversation
Step 4 Role-play the conversation
1:Pairs work
2:Act the conversation out
Step 5Adding the information
Search the internet ,find the information about earth and the pollution
Step6 Composition
How to Protect the earth?
Step 7 Homework