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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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
单项选择题
We must ______ on water during the dry season.
A．economical
B．economize
C．economy
D．economically
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