单项选择题

Edison considered his deafness（）

A．a disadvantage
B．a blessing
C．something from a priest
D．a necessity

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单项选择题
Thomas Edison worked（）hours a day so he called himself a two-shift man .

A．24
B．8
C．12
D．16
单项选择题
Of all the inventions,（）was probably the most important for civilization.

A．the vote recorder
B．the stock ticker
C．the light bulb
D．the motion picture camera
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