问题 选择题
如图所示,两根相距为l的平行直导轨ab、cd、b、d间连有一固定电阻R,导轨电阻可忽略不计;MN为放在ab和cd上的一导体杆,与ab垂直,其电阻也为R;整个装置处于匀强磁场中,磁感应强度的大小为B,磁场方向垂直于导轨所在平面(指向图中纸面内);现对MN施力使它沿导轨方向以速度v(如图)做匀速运动;令U表示MN两端电压的大小,则(  )

A.U=vBl,流过固定电阻R的感应电流由b到d

B.U=vBl,流过固定电阻R的感应电流由d到b

C.U=vBl,流过固定电阻R的感应电流由b到d

D.U=vBl,流过固定电阻R的感应电流由d到b

答案

答案:A

阅读理解

根据短文内容,从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Although problems are a part of our lives, it certainly doesn’t mean that we let them rule our lives forever. One day or the other, you’ll have to stand up and say – problem, I don’t want you in my life.

  小题1:   Problems with friends, parents, girlfriends, husbands, and children – the list goes on. Apart from these, the inner conflicts within ourselves work, too. These keep adding to our problems. Problems come in different shapes and colors and feelings.

But good news is that all problems can be dealt with. Now read on to know how to solve your problems.

Talk, it really helps. What most of us think is that our problem can be understood only by us and that no talking is going to help.   小题2:   Talking helps you move on and let go.

Write your problems.   小题3:   When you write down your problems, you are setting free all the tension from your system. You can try throwing away the paper on which you wrote your problems. By doing this, imagine yourself throwing away the problems from your life.

Don’t lose faith and hope. No matter what you lose in life, don’t lose faith and hope. Even if you lose all your money, family… you should still have faith.   小题4:   

Your problems aren’t the worst. No matter what problem you get in life, there’re another one million people whose problems are huger than yours.    小题5:   Your problems might just seem big and worse, but in reality they can be removed.

Go about and solve your problems because every problem, however big or small, always has a way out.

A.But the truth is that when you talk about it, you’re setting free the negative energies that have been gathering within you.

B.When we have a problem, a pressing, critical, urgent, life-threatening problem, how do we try and solve it?

C.Tell yourself: when they can deal with them, why can’t I?

D.Of course, we’ve been fighting problems ever since we were born.E. We can often overcome the problem and achieve the goal by making a direct attack.

F. Having a personal diary can also be of huge help if you don’t want a real person to talk with.

G. With faith and hope, you can rebuild everything that you lose.

单项选择题 A1/A2型题