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    The abacus was invented in the sixth century by Chinese people. 【查看更多】

     

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    The abacus was invented ________ by Chinese people.


    1. A.
      in the sixth Century
    2. B.
      in the sixtieth Century
    3. C.
      in the sixteenth Century
    4. D.
      in the six Century

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    The abacus _____ invented in the sixth century by Chinese people.
    [     ]
    A. be
    B. is
    C. was
    D. were

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    --When _____ the abacus _____?   -- In the sixth century by the Chinese people.

    A．is, invented

    B．did, invent

    C．was, invented

    D．does, invent

     

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    请看下面表格，完成作文。
    invention when who be used for
    camera 1827 Joseph
    Nicephore
    Niepce     		taking photos
    abacus in the sixth century Chinese people counting
    chips 1853 George Grum eating
    例句： 
            Camera was invented by Joseph Nicephore. Niepce in 1827. It's used for taking pictures. There are
    many great inventions in the world. Here is a short introduction.                                                           
                                                                                                                                                          
                                                                                                                                                          

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