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    精英家教网 > 高中英语 > 题目详情
    Thomas Alva Edison didn’t “invent” the light bulb (灯泡), but rather he ______ a 50 –year –old idea, which is not well –known.
    A．improved uponB．take downC．put upD．break away
    A
    句意：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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