单项选择题

It is strictly ______ that access to confidential documents is denied to all but a few.

A．refrained
B．forbidden
C．regulated
D．hampered
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单项选择题
He sat ______ his head, trying to think of the answer.
A．scrapping
B．screwing
C．scraping
D．scratching
单项选择题
Ignorant people were ______ of Columbus's theory that the earth was round.
A．mysterious
B．cynical
C．skeptical
D．tolerant
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