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A. We should plant more trees. B. What makes the air dirty? C. Why is there dust? D. Where is the smoke from? E. Good for you! |
Miss Fang: Hi, Children!
Kitty: The smoke and the dust (灰尘) make the air dirty.
Miss Fang: Good!
Ben: It's from the cars, buses and the factory.
Miss Fang: Great!
Peter: Because people cut down a lot of trees. The wind blows strongly and there is dust everywhere.
Miss Fang: What should we do to keep the air clean?
Alice:
Miss Fang: Great!
