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2. 教学难点：能正确运用现在进行时，现在完成时，被动语态，情态动词和 used to 句型。
教学步骤: Section A 1 (1a-1c)
I. Presentation
Show the picture of the earth and tell students the earth is polluted now. For example: (1) The factories that burn coal pollute the air with a lot of black smoke. (2) Factories put waste into the river. (3) People should throw away litter in the bin. (4)There are more cars on the road.
II. Learning .
Here are some words related to different kinds of pollution. Write them in the box below. Then add more words.
loud music cars rubbish planes littering ships factories
smoking building houses mobile phones
noise pollution _____________ _____________ _____________ _____________
air pollution ____________ ____________ ____________ _________
water pollution ___________ ___________ ___________ ___________
Then check the keys.
III. Listening
1. 1b Listen and complete the sentences.
What was the problem? The river was _____________. Even the bottom ( 底 部 ) of the river was full of ________. There were no more ______ for fishermen (渔民) to catch.
What caused the problem? People are throwing _______ into the river. Factories are putting ______ into the river.
How should the problem be solved? We should write to the ____________ and ask them to ___________ the factories. Everyone should help to __________ the river.
Keys: really dirty rubbish fish litter waste government
close down clean up
IV. Practice
Role-play the conversation in 1c.
Mark: The river was dirty. Even the bottom of the river was full of rubbish.
Tony: But it used to be so clean!
Mark: Yes, but people are throwing litter into the river.
Tony: Everyone in this town should play a part in cleaning it up!
Make conversations using the pollution in 1a.
Then ask some groups to show us their conversations.
V. Language points
We’re trying to save the earth! 我们正在竭尽全力拯救地球!
try to do sth =try one’s best to do sth 努力去做某事。