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    Thomas Alva Edison didn’t “invent” the light bulb, but rather he ______ a 50 –year –old idea, which is not well –known.

    A. improved upon    B. take down       C. put up        D. break away

           A   


    解析:

           题意：鲜为人知是的，爱迪生并没有发明灯炮，而是在其50年前的发明上改进了电灯泡（把灯丝寿命延长到13.5小时）。improve on/upon超过，改进；take down把…… 拆卸开；put up张贴，搭建；break away摆脱。

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