单项选择题

The individual experiencing the beginning of a panic attack usually feels as though he or she is on the ______ of dying or of losing his or her sanity.

A．margin
B．border
C．verge
D．fringe
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单项选择题
Civil servants should be as helpful as possible, and ______ information only in the interests of national security.
A．deprive
B．withhold
C．violate
D．affirm
单项选择题
This can result due to reductions in overmanning and improvements in other types of ______ management procedures.
A．timid
B．tedious
C．suspicious
D．slack
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