Thomas Alva Edison didn’t “invent” the light bulb (燈泡), 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：鮮為人知是的，愛迪生并沒有發(fā)明燈炮，而是在其50年前的發(fā)明上改進(jìn)了電燈泡（把燈絲壽命延長(zhǎng)到13.5小時(shí)）。Improve on/upon超過，改進(jìn)；take down把……拆卸開；put up張貼，搭建；break away擺脫。
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