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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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
How long will it take you if you go to Angel Falls by plane from Caracas
A．Several weeks.
B．Several months.
C．A few days.
D．Several hours.
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