【題目】— Who the first practical light bulb?
— Thomas Edison.
A.developed
B.discovered
C.carried

【答案】A
【解析】句意：——誰……第一個(gè)實(shí)用的電燈泡？——湯姆斯.愛迪生。A.發(fā)展，研發(fā)；B發(fā)現(xiàn)； C. 搬動(dòng)。develop是指沒有存在過的，被創(chuàng)造出來的東西，而discover是這個(gè)東西本身存在，只是最后被人發(fā)現(xiàn)了而已。電燈泡以前是未存在過的，故應(yīng)該選A。

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