问题 选择题

关于电解槽的叙述中不正确的是(  )

A.与电源正极相连接的是电解槽的阳极

B.与电源负极相连接的是电解槽的阴极

C.电流从电源的负极沿导线流人电解槽的阴极

D.在电解槽的阳极发生氧化反应

答案

与电源正极相连的是电解槽的阳极,阳极发生氧化反应,与与电源负极相连接的是电解槽的阴极,阴极发生还原反应,电流从电源的正极沿导线流入电解槽的阳极,由阴极流入电源的负极.

故选C.

阅读理解

阅读理解。

      A superstar is someone who is unusually famous in sports , or films , or

popular music , someone like the singer Michael Jackson. In the nineteen

eighties, Michael Jack-son made a record album  (歌集,唱片 ) called

" Thriller" . It quickly became the most popular record in the history of music and it made Michael Jackson a superstar.The word "super" means more than usual or very wonderful. And of course , a " star"  is a person who is very

fa-mous and skillful. So the top people who are very wonderful and skillful

in sports,films or music are called super-stars,such as Yao Ming. One of the most famous sports superstars in the United States is the boxer Muhammad

Ali. After he won a gold medal in the Olympics and became the heavy-weight boxing champion, he was known as one of the greatest and most famous

boxers in the sports history. At that time Muhammad Ali was everi better

known than the president of the United States. He was a true superstar.

Nearly everyone knew his name. But like the stars in the sky, a superstar may fade away as the years go by. These days people know little about Muhammad Ali. Superstars,loved by millions of people today, may be forgotten

tomorrow.    

1. According to the author who is NOT a superstar?

A. Michael Jackson.

B. The head of a school.

C. Muhammad Ali.

D. Yao Ming.

2. Which word below can be used to describe Muham-mad Ali?                

A. Friendly.  

B. Clever.    

C. Foolish.  

D. Famous.

3. According to the passage, what would happen to superstars at last?

A. They will be remembered by millions of people.

B. They will become the most important people in his-tory.

C. They will be loved only by young people.

D. They will be little known as time passes by.

4. If a person______,we call him a superstar.

A. is the leader of a country

B. is a very famous football player

C. is loved by millions of people

D. fades away as time passes by

5. Which of the following is a superstar?

A. San Mao.      

B. Yao Ming

C. Mao Zedong.    

D.Cao Cao.

单项选择题