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4) We should write to the government.
5) I think one problem is that the air is badly polluted.
三、1. 能听懂关于环境污染和环境保护的听力材料。
2. 能正确运用现在进行时态，used to结构，现在完成时态， 被动语态和情态动词谈论环境污染和环境保护。
四、通过谈论环境污染，学生能培养自己的环保意识。做到：保护环境，从我做起，从小事做起。
1.煤___________ 2丑陋的__________ 3.优点__________ 4.花费 _________
5.木制的_________ 6.塑料的________ 7.外卖的_______ 8. 垃圾箱 _________
9.垃圾，废弃物_________
10.底部，最下端_________
11.渔民，钓鱼的人_________
What is the biggest problem on our earth?
Pollution
How many kinds of pollution do you know?
noise pollution
water pollution
air pollution
loud music cars rubbish planes
littering ships factories smoking
building houses mobile phones
loud music planes building houses mobile phones
rubbish littering ships
factories
cars factories smoking
building houses
Listen and complete the sentences.
What was the problem?
The river was _____________. Even the bottom of the river was full of ___________. There were no more __________ for fishermen to catch .
What caused the problem?
People are throwing __________ into the river.
Factories are putting _________ into the river.