单项选择题

When the man came ______ after the operation he found himself back in bed.

A．on
B．in
C．over
D．round
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单项选择题
Anthropologists usually study simple, unindustrialized societies because the number of ______ is limited.
A．vehicles
B．variables
C．varieties
D．systems
单项选择题
It takes a great deal of power of ______ a spaceship into space.
A．elevate
B．launch
C．flourish
D．take off
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