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16．A．at the same time       
B．all the same            
C．all the time．

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解答 A

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2．
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TV		The first TV set was invented by an English scientist，John Baird，in 1926．The invention helped people watch films at home instead of going to the cinema as before．At first，TV sets only broadcast black-white pictures．Several years later，colored TV sets made the pictures lively．However，they were heavy and thick，so it was difficult to move them．Then，digital TV sets came into being．They are light and thin．Many TV  programs  are  available （可獲得的） at  any  time．At  present，people can  use  the  IPTV（ 網絡電視） to  record  and  replay  programs．



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