问题 选择题
小艳同学某天在家开灯时,灯不亮,经检查发现保险丝被烧断.她在爸爸的协助下用一盏标有“220V  40W”的灯泡L0(检验灯泡)取代保险丝接入电路,如图所示.然后进行如下操作,并观察到相应的现象:当只闭合开关S1时,L0和L1均发光,但都比正常发光暗;当只闭合开关S2时,L0正常发光,L2不发光.由此可以判断(  )

A.L1和L2所在的支路均短路

B.L1所在的支路完好,L2所在的支路短路

C.L1所在的支路完好,L2所在的支路断路

D.L1所在的支路短路,L2所在的支路断路

答案

答案:B

完形填空
完形填空。
     When Liu Kaiqu was young he was poor in Shanghai. One day he   1   a picture of a tiger and tried to sell
it on the street. It caught the   2   of an American, who asked, "How much does it cost?" He said, "500 dollars."
The foreigner thought it was too   3   and asked again, "Can you make it cheaper?" He answered, "No," Then
he tore (撕) it to pieces. In great   4  , the foreigner said, "Young man, are you angry?" "No, sir. I'm not angry.
I sold it   5   500 dollars because I thought it was worth the   6 . But you wanted a lower price. It means   7   
didn't think so and it is not good enough. I'll go on working   8   until my customers (顾客) are satisfied." At
that time,   9   Liu Kaiqu was not famous at all, he never  10  his dream. Now he is well-known all over the
world as a great artist.
( )1.A. stole           
( )2.A. attention       
( )3.A. terrible         
( )4.A. fear             
( )5.A. over             
( )6.A. size             
( )7.A. we               
( )8.A. faster and faster
( )9.A. though           
( )10.A. broke off       
B. picked          
B. instruction    
B. big            
B. difficulty      
B. for            
B. price          
B. he              
B. better and better 
B. because        
B. cut up          
C. drew            
C. decision        
C. old            
C. surprise        
C. about          
C. weight          
C. you            
C. slower and slower
C. whether        
C. gave up        
D. saw              
D. discussion       
D. dear             
D.  excitement      
D. among            
D. position         
D. it               
D. harder and harder   
D. until            
D. sent off         
连词成句