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        The most important diamonds are    1    we never see-the diamonds used in industry． Their value lies in their hardness, not their beauty, and in the thousands of   2   they do．

        Industrial diamonds make the needles for hifi phonographs (唱机)． Diamonds cut    3    solid rock in search of oil． Dentists use diamonds too often    4    a powder glued(粘合) to paper or a wheel．Other diamond wheels cut and    5    stones and cut metal parts for all kinds of engines．They are    6    used to make wheels for grinding(磨光) and polishing(擦亮)metals．

      Most marvelous of all    7    the diamond dies． These are flat diamonds through which small    8    have been drilled(钻空)．When metal is    9    through the small hole in the diamond, it comes out as thin wire．

        Cars, airplanes, nails, tin cans, radios, refrigerators, and most electrical 10 could not be made without using industrial diamonds．

    1．A．which

    B．that

    C．those

    D．what

    2．A．jobs

    B．works

    C．duties

    D．functions

    3．A．split

    B．apart

    C．break

    D．through

    4．A．with

    B．by

    C．as

    D．like

    5．A．polish

    B．break

    C．sharpen

    D．flatten

    6．A．yet

    B．still

    C．too

    D．also

    7．A．is

    B．are

    C．was

    D．were

    8．A．eyes

    B．gaps

    C．slits

    D．holes

    9．A．tugged

    B．towed

    C．pulled

    D．hauled

    10．A．equipment

    B．device

    C．apparatus

    D．instrument

     

    答案：C;A;D;C;A;D;A;B;C;A
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