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
Since you didn't go over the lessons before the exam, you can find no ______ for your failure.
A．explanation
B．excuse
C．exception
D．expection
单项选择题
The doctors ______ the medicines to the people in the flood area.
A．distributed
B．allotted
C．spread
D．scattered
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