问题 选择题

如图所示使物体A、B带电的实验为

A.摩擦起电      B.传导起电      C.感应起电     D.以上都不对

答案

答案:C

题目分析:当带电的球靠近Ab时,由于静电的感应,会使左端出现负电荷,右端出现正电荷,当把AB分开之后,A就带了负电,B就带了正电,所以本实验为使物体感应起电,所以C正确.

点评:本题是基础的题目,在平时要注意多积累,掌握住使物体带电的方法.

多项选择题 X型题
完形填空
完形填空。
     We always want what we cannot have. When we're young, we want to stay out late, have romantic
relationships,and be __1__.However,when we're __2__,we want to go back to being young and we
__3__ the days when we didn't have to worry about complex love affairs,__4__ pressure,and money
problems.Young people believe adulthood __5__ freedom from parents and schoolwork.When they get
older,they feel that __6__ is freedom from work pressure and family responsibilities.To __7__ this feeling,
people say,"The grass is always __8__ on the other side."
     As __9__,we like to be adults, but as young adults, we __10__ to be young again. We think  about
staying out late,__11__ our own money to spend.Suddenly,they see that love can result in __12__ heart
s;staying out late makes it hard to get ready for __13__ the next morning.They find out that adult life is
 not as __14__ as they thought it would be and suddenly,__15__ becomes very scary.
     Life is __16__.It gives us time to __17__ but also requires us to work.The time will come when we
must grow up and we will always look back wishing we __18__ being young a bit longer.That time will
not come back.It is normal to want what we cannot have but the _19_ is that to be happy is to appreciate
what we have.That is the first step to growing up.__20__ life becomes more complex we will not regret
the time we wasted wishing we were adults.
( )1.A.comfortable?
( )2.A.older  
( )3.A.like  
( )4.A.study  
( )5.A.creates  
( )6.A.childhood  
( )7.A.reduce  
( )8.A.greener  
( )9.A.researchers
( )10.A.wish  
( )11.A.making  
( )12.A.healthy  
( )13.A.breakfast  
( )14.A.rich  
( )15.A.life  
( )16.A.long  
( )17.A.study  
( )18.A.stopped  
( )19.A.reason  
( )20.A.If  
B.dependent  
B.defeated    
B.forget      
B.job        
B.shows      
B.adulthood  
B.describe    
B.thinner    
B.teenagers  
B.decide      
B.having      
B.ambitious  
B.school      
B.busy        
B.love        
B.short      
B.think      
B.enjoyed    
B.result      
B.When        
C.independent  
C.married  
C.regret  
C.age  
C.means  
C.parenthood  
C.experience  
C.yellow  
C.adults  
C.return  
C.worrying about
C.broken  
C.exercise  
C.free  
C.career  
C.fair  
C.play  
C.imagined  
C.dream  
C.Unless  
D.polite        
D.confident    
D.miss          
D.health        
D.limits        
D.romanticism  
D.understand    
D.colorful      
D.elders        
D.stop          
D.showing off  
D.excited      
D.work          
D.easy          
D.future        
D.beautiful    
D.live          
D.tried        
D.truth        
D.Before