问题 单项选择题

影响ADSL性能的主要因素是:()

A、所传输数据使用的协议

B、信号、频率

C、调制解调器

D、线路衰减

答案

参考答案:D

阅读理解

阅读理解。

     The students were having their chemistry class. Miss Li was telling the children what water was like.

After that, she asked her students, "What's water?" No one spoke for a few minutes. Miss Li asked again. "Why don't you answer my question? Didn't I tell you what water is like?"

     Just then a boy put up his hand and said, "Miss Li, you told us that water has no color and no smell.

But where can we find Such kind of water? The water in the river behind my house is always black and it

has a bad smell. " Most of the children agreed with him.

     "I am sorry, children," said the teacher."Our water is getting dirtier and dirtier. That's a problem. "

1. The students were having their _______ class.

A. English                  

B. Chinese

C. chemistry                  

D. math

2. Miss Li was telling the children what          __was like.

A. water                    

B. air

C. earth                      

D. weather

3. A boy said, "The water in the river behind my house is always      ____  .

A. whit e                    

B. black

C. clean                    

D. clear

4. Most of the children _       __  the boy.

A. agreed with            

B. wrote to

C. heard from              

D. sent for

5.The water in the river has color and smell because it is getting         ___.

A. more and more        

B. less and less

C. cleaner and cleaner      

D. dirtier and dirtier

单项选择题