单项选择题

You have to be ______ when you try to work out mathematical formulas.

A．reasonable
B．rational
C．logical
D．sound
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单项选择题
He ______unwisely, but he was at least trying to do something helpful.
A．may have acted
B．must have acted
C．should act
D．would act
单项选择题
They are trying to ______ the forest to its original pristine condition.
A．revive
B．restore
C．renew
D．refresh
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