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3. 情感目标: 有环境危机意识，学会关注环境保护环境。
二、教学重难点：
1. 教学重点：（1）能正确运用现在进行时，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，被动语态，情态动词和used to 句型。
三、教学步骤:
I. Presentation
Show the picture of the earth and tell students the earth is polluted now.
Play a songabout the earth.
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
____________ ___________ _____________
____________ ___________ _____________
____________ ___________ _____________
____________ ___________ _____________
Keys?: noise pollution loud music planes mobile phones building houses
air pollution factories smoking cars building houses
water pollution ships rubbish littering factories
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.