单项选择题

Water always ______ steam when boiled.

A．gives out
B．gives up
C．gives off
D．gives in
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单项选择题
Two hundred dollars ______ a large sum of money to the old man.
A．is
B．is to be
C．are
D．are to be
单项选择题
The salary of an engineer is much higher ______.
A．than a teacher
B．than that of a teacher
C．in comparison with a teacher's
D．than of a teacher's
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