问题 选择题
如图所示,矩形线圈有N匝,长为a,宽为b,每匝线圈电阻为R,从磁感应强度为B的匀强磁场中以速度v匀速拉出来,那么,产生的感应电动势和流经线圈中的感应电流的大小应为(  )

A.E=Bav,

B.E=NBav,

C.E=Bav,

D.E=NBav,

答案

答案:D

阅读理解

阅读理解

       When you are feeling unhappy or forget how great you are, these are six ways to make you feel

good about yourself.

       1) Look in the mirror and say to yourself, "I am a special person and there's no one in the world

like me. I can do anything!" It may not sound so good, but it really works!

       2) Do something nice for someone. Helping others always makes you feel good.

       3) Smile! Be friendly to people you meet. Look for the good things in your friends and family.

       4) Learn something new! Have you always wanted to decorate(装饰) your own room or learn

how to swim? New challenges(挑战) are fun and give you a sense of accomplishment (成就感)

when you have finished.

       5) Read and start a diary. Turn off the TV and let your imagination fly! Write down your thoughts,

dreams or anything you want! Writing always helps to express your feelings.

       6) Stay with your family. We all need our family time. Talk with you Mum or Dad or maybe even

your cousin.

1. According to the passage, when you are helping others, you will_________.   

A. be special.    

B. be sure.    

C. be nice.      

D. be remembered.

2. Which of the following should you say "NO" to when you are unhappy?

A. You should always look for the good things in others.

B. Stay alone at home as much as possible.

C. Learn something new and go for it!

D. Keep a diary to express your feelings.

3. The best title for the passage is ______________.

A. Do Your Best                  

B. Six Ways to Feel Good About Yourself

C. It's Never Too Late to Learn      

D. Always Smile to Yourself

单项选择题