问题 不定项选择

如图所示,光滑绝缘直角斜面ABC固定在水平面上,并处在方向与AB平行的匀强电场中,一带正电的物体在电场力作用下从斜面的底端运动到顶端,它的动能增加了△Ek,重力势能增加了△Ep。则下列说法错误的是                    

[ ]

A.电场力所做的功等于△Ek

B.物体重力做功等于-△Ep

C.合外力对物体做的功等于△Ek

D.电场力所做的功等于△Ek+△Ep

答案

答案:A

阅读理解

阅读理解。

     The best way of learning a language is using it. The best way of learning English is talking in English

as much as possible. Sometimes you'll get your words mixed up( 混合 ) and people will not understand

you. Sometimes people will say things too quickly and you can' t understand them. But if you keep your

sense of humor( 幽默感 ) , you can always have a good laugh at the mistakes you make. Don't be

unhappy if  people seem to be laughing at your mistakes. It's better for people to laugh at your mistakes

than to be angry with you , because they don't understand what you are saying. The most important thing

for learning English is : "Don't be afraid of making mistakes because everyone makes mistakes."

1. The writer thinks that the best way for you to learn a language is ____.                       

A. writing  

B. listening  

C. using it  

D. learning grammar

2. What should you do in learning English?

A. Be careful not to make any mistake.  

B. Write as quickly as you can.

C. Laugh more often.      

D. Speak English as much as you can.

3. When people laugh at your mistakes, you should ____.

A. not care                       

B. be happy

C. feel worried                  

D. be unhappy

4. When you make a mistake, you should ____.

A. keep quiet         

B. keep your sense of humor

C. be kind          

D. get angry

5. The story tells us : "_____".

A. Only foolish (愚蠢的) people make mistakes

B. Few people make mistakes

C. People never make mistakes

D. There is no one who doesn't make mistakes

单项选择题