问题 选择题

把同样长短和同样粗细的一根铜导线和一根镍铬合金导线串联在电路中,下列说法中正确的是(  )

A.铜导线两端电压大,通过的电流大

B.镍铬合金两端电压大,通过的电流大

C.铜导线两端电压大,但两根导线通过的电流一样大

D.镍铬合金两端电压大,但两根导线通过的电流一样大

答案

因为导体电阻取决于导体的长度、横截面积和材料,两导线的长度和横截面积相等,所以可知镍铬合金导线的电阻大;

当它们串联时,通过它们的电流相同,电阻大的分压大,所以镍铬合金导线两端的电压大.

故选D.

阅读理解

阅读理解。

     One Sunday evening two men met in a London pub. One of them was very unhappy.

     "Life is terrible. Everything in the world is really boring," he said.

     "Don't say that," said the other man. "Life is marvelous! The world is so exciting! Think about Italy. It is a

wonderful country. Have you ever been there?"

     "Oh, yes. I went there last year and I didn't like it."

     "Well, have you been to Norway(挪威)? Have you even seen the midnight sun?"

     "Oh, yes. I went in 1994 and I saw the midnight sun. I didn't enjoy it."

     "Well. I have just returned from Sahara Desert (撒哈拉沙漠) in Africa. Have you visited Africa yet?"

     "Yes. I went to Sahara Desert in Africa last year. It was really boring."

     "Well," said the other man, "I think you're very ill. Only the best psychiatrist(心理学家) can help you. Go to

see Dr. Greenhaum in Harley Street."

     " I am Dr. Greenhaum," answered the man sadly.                                                      

1.Where were the two men according to the passage?

A. They were in Italy.            

B. They were in Norway.

C. They were in Sahara Desert.      

D. They were in a London pub.

2. When did the unhappy man go to Norway?

A. Last year.    

B. In 1994.      

C. Two years ago.      

D. We don't know.

3. What does the underlined word "marvelous" mean in Chinese?

A.  无聊的    

B. 伤心的      

C. 妙极了的      

D. 乐观的

4. Why did the man talk with the unhappy man?

A. Because he wanted to make the unhappy man happy.

B. Because he wanted to know who the unhappy man was.

C. Because he wanted the unhappy man to pay for his drinks.

D. Because they were good friends.

5. After reading the passage, we can infer (推断) _______ .

A. the man was angry with the unhappy man

B. the man took the unhappy man to see the best psychiatrist

C. the man was surprised to know the unhappy man was Dr. Greenhaum

D. the man went away because the unhappy man didn't listen to him.

单项选择题