问题 单项选择题

2011年5月第51~54题由ISO制定的MPEG系列标准中,(1)是多媒体内容描述接口标准,VCD使用了(2)标准,DVD使用了(3)标准,(4)标准定义了基于视频对象的编码技术。 空白(2)处应选择()

A.MPEG-1

B.MPEG-2

C.MPEG-4

D.MPEG-7

答案

参考答案:A

解析:MPEG已制定和制定中的标准包括MPEG-1、MPEG-2、MPEG-4、MPEG-7和MPEG-21标准,其中MPEG-1、MPEG-2和MPEG-4主要针对音视频编码技术,而MPEG-7和MPEG-21则已经不再是音、视频压缩编码的标准,MPEG-7是多媒体内容描述接口标准,而MPEG-21是多媒体应用框架标准。VCD使用了MPEG-1标准作为其音视频信息压缩编码方案,而MPEG-2标准中的音视频信息压缩编码技术被应用到DVD中。

选择题
完形填空
完形填空。

     The half-empty coffee cups, still standing next to their plates, tell of a morning like any other. And
yet, that grey covering of dust that everything   1   tells a different story: it tells of screams, tears, terror
and   2  . Now the restaurant in the World Trade Center will   3   again serve breakfast. And never
again will all those people go there to eat or   4  . So many people whose faces we associate with life
and liveliness are gone
   5 . So many words remain    6  , and so much happiness has been destroyed. In their places are
tear-stained(泪水沾湿的) faces.
     My generation has seen this. On Monday, a fight with my sister, a bad grade and homework 7  to
be the biggest problems in the world. Tonight, so many across the country know that America's pain
is at its    8   ever.
     We have   9   World WarⅡ. But to most of us students, that's an event on a textbook  10   that
would never happen today.  
     After all, this was a time of   11   and wealth-the United States was powerful and successful. There
would be no more wars, and we were   12   to live in such a time.
     But when those planes   13   ; when firefighters with   14   on their faces ran among the parts of the
building that had fallen; when people   15   for their family members; when history was unfolding before
our eyes, in full, clear color-then we knew the world had been changed.   16   how many human beings
turned to ashes in a second, and seeing some jump from the buildings, I know that my generation is
growing up in a world where    17   can still be evil.
     But seeing those heroes risk their lives among the castle-like ruins, and seeing the   18     blood
donors at the hospitals, my generation has learned that tears are allowed, that mankind can also be 
  19   , and that the ghost of evil never   20   the spirit of good.

( ) 1. A. dresses  
( ) 2. A. blood      
( ) 3. A. still      
( ) 4. A. work    
( ) 5. A. yesterday  
( ) 6. A. unknown    
( ) 7. A. turned    
( ) 8. A. least      
( ) 9. A. experienced
( )10. A. text       
( )11. A. tears    
( )12. A. unlucky    
( )13. A. fell      
( )14. A. terror  
( )15. A. called    
( )16. A. Knowing    
( )17. A. everyone    
( )18. A. unwilling  
( )19. A. beautiful
( )20. A. hurt    
B. gets    
B. surprise
B. never    
B. drive    
B. tonight
B. untold
B. had      
B. worst    
B. known
B. lesson  
B. terror  
B. promising
B. landed  
B. surprise
B. screamed
B. Telling
B. nobody
B. eager
B. terrible
B. beat    
C. wears  
C. laugh      
C. hardly    
C. play      
C. last night  
C. unchanged    
C. got        
C. best      
C. read about  
C. copy      
C. peace      
C. convenient  
C. hit        
C. joy        
C. died        
C. Hearing    
C. mankind      
C. happy      
C. terrified    
C. wins      
D. covers              
D. cry                  
D. seldom              
D. swim                
D. this morning        
D. unsaid              
D. seemed              
D. most                
D. seen                
D. page                
D. health              
D. lucky                
D. exploded            
D. smile                
D. reached              
D. Remembering          
D. our country          
D. curious              
D. hopeful              
D. defeats