问题 选择题

设NA为阿伏加德罗常数的值,下列有关叙述正确的是

A.1 mol羟基所含的电子总数为10NA

B.标准状况下,1L正戊烷完全燃烧所生成的CO2分子数为5NA/22.4

C.4.2g乙烯和丙烯的混合气体中所含碳原子数为0.2NA

D.1 mol碳正离子(CH3+)所含的电子总数为8NA

答案

答案:A

题目分析:1mol羟基电子总数应是9NA所以A错,标况下正戊烷为非气态物质所以不能用22.4L/mol B错,4.2乙烯和丙烯的混合气体碳原子数应是0.3NA 所以C错,1mol碳正离子恰好8mol既是8NA所以D正确

阅读理解

阅读理解。

     People from other countries will find many different surprising things in Britain.

     Greek: A man from Greek sees a special way of driving in Britain. People drive on the left in the British street, but the British people never feel surprised. The Greek man said, "I've been in Britain for nearly a

month now. But at first, I couldn't always remember to drive on the left.  Every time, my friend reminded

me. "

     Japanese: Japanese people can't understand why British people keep their shoes on at home. In Japan, people walk in the room without shoes.If visitor keeps his shoes on at home in Japan,the Japanese people

think he is very impolite.

     Spanish: The Spanish people mind the way that the British people greet each other. They themselves

seem to be afraid of touching(接触). When they meet, they just smile or nod but never kiss or hug(拥抱)

in Spain.  But the British people think kissing is a very usual greeting when they meet!

     There is an old saying,"When in Rome, do as Romans do."When we go to a foreign country,we should follow the etiquette of the country.

1. The Greek visitor_______.

A. always drives on the left

B. used to drive on the left

C. drove correctly in Britain with his friend's help

2._______think it's impolite to wear shoes at home.

A. The Japanese

B. The Greek

C. The English

3. When greeting, the Spanish_______ .

A. kiss each other

B. hug each other

C. smile at each other

4. _______seem not to be afraid of touching each other.

A. The Spanish

B. The British

C. The Japanese

5. Etiquette in the world_______.

A. is the same

B. is important

C. is sometimes different and interesting

单项选择题