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二、教学重难点：
1. 教学重点：（1）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。
（2）保护环境的措施方法。
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。
三、教学步骤:
Section A 1 (1a，1b,1c and 2d)
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.
Learn some new words.
II. Work on 1a
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 phonesnoise pollution air pollution water pollution
____________ ___________ _____________
____________ ___________ _____________
____________ ___________ _____________
____________ ___________ _____________
III. Listening
1. Work on1b. 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.2. Listen again and answer the following questions.
What does Tony want to do later this afternoon?
He wants to go swimming with Mark in the river later this afternoon.
2) Why doesn’t Mark want to go with Tony?
Because the river was really dirty. Even the bottom of the river was full of rubbish, and there were no more fish for fishermen to catch.
3) How was the river in the past?
It used to be so clean. It has been the nicest river in this town.