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  • 1. 选择适当的句子,完成对话

    A. It makes the air dirty.

    B. We should ride a bike more often.

    C. The air is clean and fresh there.

    D. It's from factories, cars and buses.

    E. I'm going to the Huangshan Mountain.

    Lily: Where are you going this winter holiday?

    Mike:

    Lily: That's a good idea.

    Mike: Yes. Look at the smoke in the sky. Where is the smoke from?

    Lily:

    Mike:We need to do something to keep the air clean. What should we do?

    Lily:

    Mike:That's right.

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