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An old woman went out shopping last Tuesday. She came to a bank and saw a car near the door. A young man with dark glasses got out of it and went into the bank. She looked into the car and found some keys in it.

The man took a gun(枪)out of his pocket and said to the man in the bank, “Give me all the money.” But the woman didn’t see this. She went to the young man and put the keys in his hand, “My boy,” she said, “Don’t leave your keys in your car! Someone is going to steal(偷) it.”

The young man looked at the old woman for a few minutes. Then he took his keys, ran out of the bank, got into his car and drove away quickly without taking any money.

小题1:The old woman went out to _____.

A．work

B．do some shopping

C．the bank

D．play小题2:The young man went into the bank and tried to ______

A．rob the bank

B．steal some money

C．borrow some money

D．see his friends小题3:The young left his keys _____

A．in the car

B．on the street

C．in his pocket

D．in the bank小题4:When the young man got his keys ,he was very____

A．glad

B．surprised

C．excited

D．frightened

（本题10分）如图所示，水平面上有两根相距1m的足够长的平行金属导轨MN和PQ，它们的电阻可忽略不计，在M和P之间接有阻值为R的定值电阻。导体棒ab长l＝1m，其电阻为r，与导轨接触良好。整个装置处于方向竖直向上的匀强磁场中，磁感应强度B＝0.4T。现使ab以v＝10m/s的速度向右做匀速运动。求：

（1）ab中的感应电动势多大？流过电阻R的电流的方向如何？

（2）若定值电阻R＝6.0Ω，导体棒的电阻r＝2.0Ω，则电路中的电流多大？ab两端的电压多大？

（3）导体棒ab所受的安培力多大？方向如何？

343，453，563（）

A．673 

B．683 

C．663 

D．666

两个袋子，第1个袋子中有红球4个，黑球196个。第2个袋子中有红球3个，黑球97个，将两个袋子中的球混合。

如果从第1个袋子中任取一个球放到第2个袋子中，再从第2个袋子中取出一个球是黑球的概率为( )。

A．0.96或0.97

B．0.96

C．0.97

D．不确定

中央银行在进行外汇买卖的同时，又通过公开市场操作对国内市场进行反向操作，以达到本币供应量不变的目的，这是非冲销干预。 ( )