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9. 想一想，写一写。
1) Why is the air dirty?
2) Where does the smoke come from?
3) How is the air in the street?
4) What’s in the street?
5) How is the air in the park?
6) What’s in the park?
7) What can we do to keep the air clean?
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1) Why is the air dirty?
2) Where does the smoke come from?
3) How is the air in the street?
4) What’s in the street?
5) How is the air in the park?
6) What’s in the park?
7) What can we do to keep the air clean?
____________________
____________________
____________________
____________________
答案：
1) Because there is smoke and dust in the air.
2) It comes from factories, cars and buses.
3) It's dirty.
4) There are many cars, buses and people.
5) It's clean and fresh.
6) There are many trees, flowers and grass.
7) We can plant more trees and take buses or bikes instead of cars.
2) It comes from factories, cars and buses.
3) It's dirty.
4) There are many cars, buses and people.
5) It's clean and fresh.
6) There are many trees, flowers and grass.
7) We can plant more trees and take buses or bikes instead of cars.
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