单项选择题

Many experts remain (skeptical) about his claims.

A．doubtful
B．untouched
C．certain
D．silent
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单项选择题
The tower remains (intact) ever after two hundred years.
A．unknown
B．unusual
C．undamaged
D．unstable
单项选择题
They didn’t seem to appreciate the (magnitude) of the problem.
A．existence
B．importance
C．cause
D．situation
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