单项选择题

The OSI Directory uses ______ names as the primary keys to entries in the directory.

A．distinguished
B．interested
C．unexpected
D．surprised
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单项选择题
If you rub certain things together, their surfaces become ______ static electricity.
A．caught up with
B．charged with
C．kept up with
D．put up with
单项选择题
I think it is only by a ______ of imagination that you say you have seen a ghost.
A．pinch
B．lack
C．shortage
D．stretch
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