试题与答案

观察下表模型并结合有关信息,判断下列说法中不正确的是( ) B12结构单元SF6

题型:选择题

题目:

观察下表模型并结合有关信息,判断下列说法中不正确的是(  )

 B12结构单元SF6分子S8分子HCN
结构模型示意图
备注熔点1873 K易溶于CS2
 

A.单质硼属于原子晶体,每个B12结构单元中含有30个B—B键和20个正三角形

B.SF6是由极性键构成的非极性分子

C.固态硫S8属于原子晶体

D.HCN的结构式为H—C≡N

答案:

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参考答案:B解析: UCase(str)将str转成大写的字符串;String(n,character)返回n个重复的字符,如果character是ASCII码,则返回其对应的字符。程序运行过程为:首先输入字母“a”,并通过“str=Chr(KeyAscii)”...

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题型:阅读理解

Hello! My name is Mike. I am from the USA. Now I am in China with my parents. I like China. I like Chinese food, too. I have breakfast at home. I eat an egg, bread and porridge(粥)for breakfast. I do not like milk. I have no time to go home for lunch. So I have it at school. The lunch in our school is good. I can have different food for lunch. I eat rice, meat and vegetables. Sometimes I have noodles(面条) and dumplings(饺子). I have dinner at home with my parents. Sometimes we go out to eat with friends. We have chicken, vegetables and fruit. 

小题1:Mike is        .

A. American              B. English             C. Japanese 

小题2:For breakfast, Mike has       

A. an egg, an apple and porridge  

B. an egg, bread and porridge

C. an apple, bread and milk    

小题3:He has lunch        .

A. at school              B. at home         C. with his parents

小题4:He has         for lunch.

A. rice, meat and vegetables  

B. dumplings  and noodles 

C. A and B are both right.

小题5:Sometimes they have dinner       .

A. at school           

B. in a restaurant with some friends

C. at his friend’s home       

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