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  3. Surfing is a thrilling and dangerous activity in which a person balances on a board and rides the surface of a big, crash ocean

Surfing is a thrilling and dangerous activity in which a person balances on a board and rides the surface of a big, crash ocean

admin2010-08-21  37
问题     Surfing is a thrilling and dangerous activity in which a person
balances on a board and rides the surface of a big, crash ocean wave.           【S1 ______.
Channel surfing is a bit different. In this activity a person sits on a couch   
and pushes the button of a television remote-control devices many times a        
minute check and recheck all the channels. In the United States, channel        【S2】______.
surfing is by far the more popular sport. When television first replaced        
radio, in the 1950s. channel surfing was known. Back then, there were           【S3】______.
only a few stations. Viewers had their favorite shows and watched it            【S4】______.
devotedly all the way through. In fact, studies showed that when a family         
sat down to watch a favorite program at 7 p. m. , they stayed with the            
same channel rest of the evening. With the coming of the cable television.      【S5】______.
dozens of channels now offer a great variety of featured films, situation       【S6】______.
comedies,  news,  weather,  talk,  science  shows,  documentaries,  and         
advertising. Facing with so many choices, viewers often become quiet and        【S7】______.
feel a need to check, in all the other stations.                                【S8】______.
    Some studies show that men m a unique U.S. household usually want           【S9】______.
to hold the remote control and surf the channel: women usually like to         
choose one program and watch through.                                           【S10】______.
【S3】
选项
答案known→unknown
解析 根据上下文的语义，应该是“人们并不知道搜索频道”。
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