As we all know ,Columbus          America and Edison         light bulbs.
A．discovered ; inventedB．invented ; discovered
C．discovered ; discoveredD．invented ; invented
A

試題分析：句意：我們都知道，哥倫布發(fā)現(xiàn)了美洲，愛迪生發(fā)明了電燈。discover發(fā)現(xiàn)，原來就有后來被人們發(fā)現(xiàn); invent發(fā)明，創(chuàng)造以前沒有的東西，根據(jù)句意，故選A
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