单项选择题

We should do everything in our power to develop ______ alternatives to petrol.

A．audible
B．capable
C．liable
D．viable
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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
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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