问题 填空题

电磁波的发现揭开了现代通信的新纪无.电磁波已成为人类文明的重要标志.但值得注意的是,电磁波也会造成______.

答案

造成电磁波污染的原因是多方面的.随着城市的发展,市区扩大,建筑用地日趋紧张,使原本处于郊区的大功率电磁发射台.电视广播发射台站逐渐被新建居民区包围,卫星通讯的发展.使得城市出现众多的卫星地面站.有的地区发射天线过密,移动通讯技术迅速发展.其电磁波信号采用直线传播,在市区高层建筑上架设许多起联络作用的基地台站,天线林立,形成相互间的交调干扰;还有部分架设不合理的天线对附近高层住宅居民产生电磁波污染,传输电力的超高压输电线路和城市交通运输系统使电磁污染增加.另外,家用电脑、彩电、音响、微波炉、电磁灶、无线手机、电热毯都会辐射出电磁波,也会造成环境电磁污染.

故答案:污染.

单项选择题
完形填空
完形填空
     Valentine's Day was the time my father chose to show his love for the special people in his life.Over
the years I fondly (天真地) thought__1__him as my "Valentine man".
     My first recollection of the__2__he could bring to Valentine's Day came when I was six.That morning
at the breakfast table I found a card and a giftwrapped package at my chair.The card was__3__"Love,
     Dad" and the gift was a ring with a small piece of red glass to__4__my birthstone, a ruby (红宝石).
There is__5__difference between red glass and rubies to a child of six, and I remember__6__that ring
with pride that all the cards in the world__7__not surpass (超越).
     __8__I grew older, the gifts gave__9__to heartshaped boxes filled with my__10__chocolate and
always included a__11__card signed "Love, Dad". In those years my thankyou became__12__of a
perfunctory (敷衍) response.The cards seemed less__13__, and I took for granted that the Valentine
would__14__be there.I had__15__my hopes and dreams in receiving cards and gifts from "significant
others" and "Love, Dad" just didn't seem quite__16__.
     final card remains on my desk today.It's a__17__of how special fathers can be and how important
it has been to me over the years to know that I had a father who continued a__18__of love with simple
acts of understanding and an ability to express happiness over the people in his life.
Those things never__19__, nor does the memory of a man who never__20__being my valentine.
( )1. A. of      
( )2. A. memory  
( )3. A. read      
( )4. A. recover    
( )5. A. much    
( )6. A. having    
( )7. A. could    
( )8. A. Because    
( )9. A. room      
( )10. A. favorite    
( )11. A. usual      
( )12. A. less      
( )13. A. important  
( )14. A. surely    
( )15. A. let        
( )16. A. suitable    
( )17. A. signal    
( )18. A. tradition  
( )19. A. lose      
( )20. A. thought    
B. about        
B. magic        
B. written      
B. resemble      
B. little        
B. owning        
B. did          
B. Since        
B. way          
B. lovely        
B. common        
B. little        
B. beautiful    
B. always        
B. kept          
B. enough        
B. certificate  
B. hobby        
B. die          
B. wanted        
C. up        
C. puzzle      
C. shown      
C. represe nt    
C. great      
C. wearing    
C. must      
C. When          
C. honour      
C. dear        
C. strange      
C. more        
C. familiar      
C. regularly    
C. placed    
C. effective      
C. consequence  
C. habit        
C. miss        
C. tried        
D. over      
D. present    
D. signed    
D. replace    
D. less      
D. watching  
D. should    
D. As        
D. seat      
D. precious  
D. special    
D. much      
D. standard  
D. often      
D. remembered
D. sacred    
D. reminder  
D. custom    
D. appear    
D. stopped