问题 单项选择题

页式虚拟存储系统的逻辑地址是由页号和页内地址两部分组成,地址变换过程如下图所示。假定页面的大小为8KB,图中所示的十进制逻辑地址9612经过地址变换后,形成的物理地址a应为十进制()。

A.42380

B.25996

C.9612

D.8192

答案

参考答案:B

解析:

在页式存储管理中,逻辑地址为页内地址。本题中,页面的大小为8KB,则页内有效地址的范围为0~8191。本题中逻辑地址为9612,则有效地址为:9612除8192取余为1420。由题目中的地址变换过程图可知,逻辑地址9612在第1页,该页在内存中对应的物理块号为3,因此,可以计算物理地址a为8192×3+1420=25996。

完形填空
阅读下面短文,掌握大意,然后从A、B、C、D四个选项中选出最佳选项。

     Life in the 2020s will be very different from life today. Between then and now many changes, will take
place. So   1   will the change be?
     The population is growing   2  . There will be many people in the world and   3   of them will live longer
than people live now.
     The computer will be even smaller and   4   and there will be at least(至少) one in every home.And   5   study will be one of the important subjects in school then.
     People will work fewer hours than they   6   now and they will have more   7   time for sports, watching TV and traveling. Traveling will be even easier and cheaper. And many more people will go to other
countries for   8  .
     There   9   changes in our food, too. More land(土地) will be done for building new towns and houses
for all the people. Then there will be less room(空间)   10   cows and sheep, so meat will be more
expensive. Maybe no one will eat it every day. Instead they eat more fruits and   11  . Maybe people will
be   12  .
        13   in the future will be different, too. Dangerous and   14 work will be done(被做) by
robots(机器人). Because of this, many people will not have any work to do. This will be a   15   .

( )1.   A. when        
( )2.   A. slowly      
( )3.   A. one          
( )4.   A. more useful  
( )5.   A. Chinese      
( )6.   A. study        
( )7.   A. important    
( )8.   A. business    
( )9.   A. will be      
( )10. A. to          
( )11. A. meat        
( )12. A. more negative
( )13. A. Music        
( )14. A. hard        
( )15. A. balance      
B. where      
B. fast      
B. most      
B. less useful
B. English    
B. like      
B. busy      
B. sports    
B. are        
B. for        
B. hamburger  
B. worse      
B. Work      
B. easy      
B. program    
C. what          
C. carefully      
C. none          
C. more expensive
C. computer      
C. do            
C. full          
C. work          
C. be            
C. in            
C. vegetables    
C. angrier        
C. Sports        
C. comfortable    
C. information    
D. how      
D. well      
D. few      
D. bigger    
D. science  
D. get      
D. free      
D. holidays  
D. have      
D. with      
D. coffee    
D. healthier
D. Food      
D. small    
D. problem  
选择题