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阅读理解。
Jerry Baldwin was 30 years old. He was the manager of a pizza restaurant. He lived in an apartment
about one mile north of the restaurant. He walked to and from work. When it was raining, he took the
bus.
Jerry loved gangster (匪徒) movies. When a new one came out, he would go to the theater and
watch the new movie three or four times. Then, when it went to video, Jerry would buy the video at
Barney's Video Store. Jerry had a home collection of over 1,000 gangster videos. Old ones, new ones,
color, black and white, English, Spanish, and Japanese-he loved them all. He could tell you the name of
the movie, the director( 导演), the stars, etc.
Jerry finally decided that he would like to own a gun, just like the gangsters. So he saved his money
for some years. Then he went to a gun store and bought a used gun for $300. While there, he also
bought many bullets (子弹) .
The following Saturday morning, he went to the gun club to practice with his new gun. He was in the
club for only 10 minutes when he dropped his gun by accident. The gun went off (走火), and the bullet
went into Jerry's right leg.
Jerry now walks with a stick, just like some gangsters.
1. Jerry Baldwin often went to work _____.
A. by car
B. on foot
C. by bike
D. by bus
2. Jerry knew a lot about _____.
A. all the gangsters
B. most directors
C. gangster movies
D. all kinds of' movies
3. Jerry decided to buy a gun because _____.
A. he wanted to be a real gangster
B. he wanted to do just like a gangster
C. he became a real gangster
D. he wanted to behave like a gangster
4. Jerry became lame (瘸的) because _____.
A. he was shot by accident
B. he fell and hurt himself
C. he shot himself with the gun
D. he was shot by his friend
5. Which statement is true according to the passage?
A. Jerry's dream to be a gangster came true at last.
B. Jerry had a strong interest in collecting gangster videos.
C. To be just like a real gangster, Jerry shot himself with a gun.
D. Jerry practiced shooting day and night and became good at it.
电流方向从b→a (2) m=0.2kg，r=2Ω (3) W=0.6J 
由右手定则判断可知杆中电流方向从b→a
,杆达到最大速度时满足 
，纵截距为v0=2m/s，
