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
The market sells mainly fruit, vegetables and dairy().

A．produce
B．production
C．output
D．stocks
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