问题
选择题
下列各物质的物质的量不能肯定是1 mol的是( )
A．23 g金属钠所含的钠原子数
B．标准状况下，17 g氨气
C．22.4 L CO2气体
D．标准状况下10 L氧气和12.4 L氮气的混合物
答案
答案：C
使用22.4 L，必须是在标准状况下。23 g Na即为1 mol。
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下列各物质的物质的量不能肯定是1 mol的是( )
A．23 g金属钠所含的钠原子数
B．标准状况下，17 g氨气
C．22.4 L CO2气体
D．标准状况下10 L氧气和12.4 L氮气的混合物
答案：C
使用22.4 L，必须是在标准状况下。23 g Na即为1 mol。
Have you heard of this story? On July 11th every year, a local office of Project Hope (希望工程) receives a donation from a person called Xu Qin. people later know that Xu Qin died July 11th, 1994.
Xu Qin was Liu Wenzhen’s youngest . Liu Wenzhen has been in the habit of making a donation to Project Hope on that day. Mrs. Liu doesn’t think her donation is a great thing. She is helping to make her daughter’s dream come true. “ I always dream of a teacher in the countryside because that is where my father’s home is,” said Xu Qin when she was .
Project Hope is built to help more poor children be able to go to school. In China, the project in 1985. Over the last twenty-two years it has helped millions of children to go to school.
As a student, we can also do something to support that project. We may save our pocket money and donate to Project Hope. Maybe we can help those children who can’t go to school to get some . We can also call on to do something for the project.
| 小题1: | A．And B．But C．So D．Or |
| 小题2: | A．on B．in C．at D．to |
| 小题3: | A．son B．daughter C．teacher D．friend |
| 小题4: | A．also B．still C．only D．probably |
| 小题5: | A．realizing B．coming C．getting D．becoming |
| 小题6: | A．lively B．alive C．young D．old |
| 小题7: | A．succeeded B．produced C．ended D．started |
| 小题8: | A．them B．ones C．it D．one |
| 小题9: | A．money B．food C．education D．culture |
| 小题10: | A．other B．the other C．others D．another |