单项选择题

Before you can fly a plane in the sky you have to learn the ______ of flying it.

A．skill
B．technology
C．knowledge
D．ability
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单项选择题
The town was no longer the sleepy little village ______.
A．it has been being
B．it was
C．it has been
D．it had been
单项选择题
Staying in a hotel costs ______ renting a room in a dormitory for a week.
A．twice more than
B．twice as much as
C．as much twice as
D．as much as twice
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