情景匹配。

①Come here. ____ A. It's a tape.

②What's this in English? ____  B. Fine, thank you.

③How are you? ____ C. OK.

226路汽车的车门是由“压缩空气”控制的，它是将一定数量的封闭气体进行压缩后放入汽缸的，压缩后的气体质量____ 、密度____ （选填：变大、不变、变小）

补全对话, 每空一句。

Doctor: Good morning! ____

Tom: Tom.

Doctor: ____

Tom: I'm not feeling well. I have a toothache and I can't eat anything.

Doctor: When did it start?

Tom: ____

Doctor: Let me examine you. Open your mouth and say "Ah", please.

Tom: Ah……Is it serious?

Doctor: ____ Just stop eating candies and take the medicine. You will feel better soon.

Tom: How often should I take the medicine?

Doctor: ____

Tom: Thank you.