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问题 不定项选择题

下列各组物质中，不管它们以何种比例混合，只要总质量一定，充分燃烧后生成的二氧化碳的质量不变的是 [ ]

A．乙炔(C2H2)和苯(C6H6)

B．乙醇和丙醇(CH3CH2CH2OH)

C．

D．

答案

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选词填空。
talk,   help,   read,   cost,   keep,   change,   do,   visit,  go,  sit
1. _____ it _____ much to live here?
2. The teacher looked at the clean classroom and said we _____ a good job.
3. The Smiths _____ greatly in the last two years.
4. He heard her singing aloud in the next room, so he _____ in a louder voice.
5. It was said that some foreigners _____ our class the next week.
6. They have done what they can _____ us finish the work.
7. Why are there so many people over there? Let's go and see what ______ on.
8. My family _____ at table when the door bell rang.
9. It's very cold in the room. Let's make a fire _____ us warm.
10. What do you think _____ about at the meeting tomorrow?
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单项选择题

固定产清理每（）进行一次。

A.月

B.季

C.半年

D.一年
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