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

    A. what is called　　　　　　　　　　　　　　　　　　　　　　   B.which is called

    C.what it called　　　　　　　　　　　　　　　　　　　　　　    D.which it is called

     

    答案：A
    解析：

    what is called “所谓的；人们常说的”。

     


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