试题与答案

网络效应

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题型：名词解释

题目：

网络效应

答案：

参考答案：

在网络经济中，表现最突出的是网络效应，即商品的价值取决于这种商品被其他人使用的情况。

考点：网络经济学网络经济概论网络经济概论题库
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题型：完形填空
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Start Today
     "What can you do when you have done nothing but mess up your whole  life  long?" These were the
words I heard when I   1      the TV the other day. They were coming  from one of  the  talk shows   2    are so popular on TV  these days.  I started  to  turn the channel but  the words  I had   3      made me stop  for a moment.  I   4       the speaker of  them. He couldn't have been more  than 18 years old, but already he
was writing off (认为……已失败) his life as a useless waste.  
     I wanted to shout at him:" You're not   5      yet!"  
     It is   6     sad that so many people cannot get beyond (摆脱) their pasts and live   7     the present.
There are so many people like that talk show guest. There are people still  in  their  teen years   8      that
their lives are over. There are people in their twenties who already think they have   9     the boat to success and happiness. There are people in their thirties and forties who sit around complaining that life has passed
them by.  I want  to shout  to  them all:" Wake up! You're still 1 0  ! What have you done today?" If you
want a happy  life, you can't dwell on (细想、纠缠于) your past   11   . If you want joy and love  in your  
life, you have  to choose  them  today. God gives us a new chance at  life every  time we wake up in the
morning. It is up to us to seize it.  
     Today 12   be  the beginning of a new  life for each of us. We can choose  joy right now. We can share
love today. We can  live  in delight starting at this moment. It doesn't matter how hard our past has been.
Our present can be full of joy and our future can be full of   13   .  It doesn't matter  if we are eight    14  
eighty--we can still make our  lives    15   . Life isn't over until your last heartbeat. Start today, then, to make your heart beat with joy, love, and light.
( ) 1. A. turned down
( ) 2. A. when
( ) 3. A. heard
( ) 4. A. looked up
( ) 5. A. death
( ) 6. A. so
( ) 7. A. at
( ) 8. A. think
( ) 9. A. taken
( ) 10. A.alive
( ) 11. A. mistake
( ) 12. A. must
( ) 13. A. pain
( ) 14. A. and
( ) 15. A. wonder

B. turned off  
B. that        
B. found        
B. looked after
B. dead        
B. so a        
B. with        
B. thinking    
B. caught      
B. living      
B. mistakes    
B. mustn't      
B. happiness    
B. to          
B. wondering    


C. turned on  
C. one        
C. seen      
C. looked for
C. die        
C. such      
C. in        
C. thinks    
C. missed    
C. lively    
C. wrong      
C. can't      
C. sadness    
C. or        
C. wondered  


D. turned up  
D. what      
D. listened to
D. looked at  
D. died      
D. such a    
D. to        
D. to think  
D. lost      
D. lovely    
D. ideas      
D. can        
D. challenge  
D. between    
D. wonderful  
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题型：选择题

在某温度时，pH=3的某水溶液中c(OH-)=10-9 mol/L，现有该温度下的四份溶液：①pH=2的CH3COOH、②0.01 mol·L-1的HCl、③pH=11的氨水、④pH=11的NaOH溶液，下列说法正确的是

A．①中水的电离程度最小，③中水的电离程度最大

B．将②、③混合，若pH=7，则消耗溶液的体积②=③

C．将四份溶液稀释相同倍数后，溶液的pH：③>④>②>①

D．将①、④混合，若有c(CH3COO-) > c(H+)，则混合液一定呈碱性
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