¡¡¡¡Model Test 10

¡¡¡¡For many people the most exciting development in recent years is Picturephone service. Picturephone service,  1  became available commercially in the 1970¬ðs, was  2  used by large business corporations. But as Picturephone service becomes available, it will no doubt  3  from the office to the home. It is already clear that "the next  4  thing to being there" is going to be a Picturephone call.

¡¡¡¡Possibly the most significant research now  5  is in the us e of the laser beam in telephone communications. This "new  6  , first produced by scientists in 1960, can beam continuously and  7  extraordinary intensity.  8  using light to  9  , they are thinking of ways to use lights to communicate by.  10  , they are thinking of using light for the same purpose  11  radio waves are now used to  12  telephone calls, television programs; and data messages from one point to another. With the  13  of Picturephone service and high speed data communications  14  computers, present messageª²carrying  15  may soon become inadequate. If it turns out to be technically and economically sound, the laser might prove to be a major  16  in telephone communications.

¡¡¡¡Current research in telephone communications is so extensive and changes are coming about  17  no one can predict with accuracy  18  the telephone of tomorrow will be like. But there is at least on e prediction that can be made  19  : there would be more and more telephones in the future, and they will be  20  .

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¡¡¡¡Key to Model Test 10

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