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
A soldier has to learn to carry ______orders as soon as they are given.
A．on
B．out
C．through
D．off
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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