单项选择题

If you do something on ______, you do it because you suddenly want to, although you haven"t planned to.

A．impulse
B．pulse
C．impromptu
D．imminence
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单项选择题
The idea that machines could be made to fly seemed ______ two hundred years ago.
A．original
B．eccentric
C．terrific
D．splendid
单项选择题
Economic activity has been organized on the ______ of cheap and abundant oil from the beginning of the 20th century.
A．gist
B．notion
C．rationale
D．premise
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