自从下列哪项发现或学说开始，化学才开始成为一门科学 A．阿

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问题选择题

自从下列哪项发现或学说开始，化学才开始成为一门科学

A．阿伏加德罗提出原子——分子学说

B．拉瓦锡确定空气的组成

C．道尔顿提出近代原子学说

D．汤姆逊发现电子

答案

答案：C

填空题

用所给词的适当形式填空。

1. The film is very _____ (surprise) and I'm( surprise) at it．

2. She _____ (buy) some flowers for her mother yesterday.

3. While I was _____ (shop), I saw my best friend.

4. The train usually _____ (leave) the station at ten o'clock in the morning.

5. I _____ (shop) in a supermarket when you called me up.

6. It's _____ (usual) for the trees to flower so early.

7. How about _____ (go) for a drive?

8. Listen! Someone _____ (knock) at the door.

9. What _____ you _____ (do) at 9:00 am. yesterday?

10. I _____ (wait) for the bus this time yesterday.

填空题

IS-LM模型中货币市场中的货币供给是货币当局决定的（）。