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问题 多选题

如图所示为某种物质发出的射线（粒子束）进入磁场后的运动情况，由图可判断出（　　）

A．射线Ⅰ带正电

B．射线Ⅲ带负电

C．射线Ⅲ带正电

D．射线Ⅱ带负电

答案

由图形可知I受力向左，由左手定则可知，射线I带正电，故A正确；

射线II在磁场中不偏转，说明Ⅱ不带电，故C、D错误；

射线Ⅲ向右偏转，则由左手定则可知，Ⅲ带负电，故B正确；

故选AB．

完形填空
完形填空。

     It was the golden season. I could see the yellow leaves   1   on the cool   2  . In such a season, I liked walking
alone in the leaves, listening to the sound of them.
     Autumn is a   3   season and life is uninteresting. The free days always get me   4  . But one day, the sound of
a violin   5   into my ears like a stream flowing in the mountains. I was so surprised that I jumped to see what it
was. A young girl, standing in the wind, was   6   in playing her violin.
     I had   7   seen her before. The music was so attractive that I listened quietly. Lost in the music, I didn't realize
that I had been   8   there for so long but my   9   did not seem to disturb her.
     Leaves were still falling. Every day she played the violin in the corner of the building  10  I went downstairs to
watch her performance. I was the only audience. The autumn seemed no longer lonely and life became  11 . 
 12  we didn't know each other, I thought we were already good friends. I believed she also liked me.
     Autumn was nearly over. One day, when I was listening devotedly, the sound suddenly stopped. To my  13  ,
the girl came over to me.
     "You must like violin," she said.
     "Yes. And you play very well. Why did you stop?" I asked.
     Suddenly, a  14  expression appeared on her face and I could feel something unusual.
     "I came here to see my grandmother, but now I must leave. I once played very badly. It was your listening
every day that  15  me." she said.
     "In fact, it was your playing  16  gave me a meaningful autumn." I answered. "Let us be friends."
     The girl smiled and I smiled.
     I never heard her play again in my life. I no longer went downstairs to listen like before. Only thick leaves
were left behind. But I will always remember the fine figure of the girl. She is like a  17 ; so short, so bright, like
a shooting star giving off so much light that it makes the autumn beautiful.
     There are many kinds of friends. Some are always  18  you, but don't understand you. Some say only a few
words to you, but are close to you. Many people will step in your life, but only  19  friends leave footprints.
     I shall always recall the autumn and the girl with the  20 . She will always bring back the friendship between
us. I know she will always be my best friend.

( )1. A. shaking      
( )2. A. wind          
( )3. A. lively        
( )4. A. up            
( )5. A. flowed        
( )6. A. lost          
( )7. A. ever          
( )8. A. waiting      
( )9. A. existence    
( )10. A. where      
( )11. A. interesting 
( )12. A. But        
( )13. A. astonishment 
( )14. A. happy      
( )15. A. surprised  
( )16. A. that        
( )17. A. song        
( )18. A. with        
( )19. A. good        
( )20. A. sound       		B. hanging  
B. snow      
B. lovely     
B. off      
B. grew      
B. active    
B. never      
B. stopping  
B. thought    
B. so        
B. moving    
B. However    
B. delight    
B. sad       
B. excited       
B. which      
B. dream    
B. for      
B. true      
B. song     		C. falling       
C. air           
C. harvest       
C. down         
C. entered       
C. busy         
C. often         
C. standing     
C. steps         
C. when         
C. encouraging   
C. Even         
C. pride         
C. strange       
C. encouraged    
C. it           
C. fire         
C. against     
C. new           
C. play       

D. floating       
D. rain           
D. lonely         
D. over           
D. ran           
D. interested     
D. usually         
D. hearing        
D. breath        
D. but       
D. exciting      
D. Though        
D. satisfaction              
D. surprised    
D. interested    
D. who           
D. wind            
D. to             
D. old        
D. violin        

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