Gibert ________ electricity, but Edison ________ the light bulb.

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Gibert _______ electricity, but Edison _______ the light bulb.

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

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

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