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    16．Just as sound travels through the air in waves , so electricity travels through the air in radio waves. A．what is called B．which is called C．what it is called D．which it is called 【查看更多】

     

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    Just as sound travels through the air in waves, so electricity travels through the air in ________ radio waves.


    1. A.
      we call
    2. B.
      we call it
    3. C.
      what we call it
    4. D.
      what we call

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