单项选择题

It's harmful to one's health to _______ smoking and drinking.

A．take on
B．take in
C．take to
D．take off
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单项选择题
The first three rows of the hall are ______ for special guests.
A．preserved
B．reserved
C．conserved
D．served
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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