单项选择题

All instruments that come into contact with the patient must be______before being used by others.

A．sterilized
B．labeled
C．quarantined
D．retained
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单项选择题
People are much better informed since the______of the Internet.
A．convenient
B．advent
C．interface
D．aftermath
单项选择题
The witness was______by the judge for failing to answer the question.
A．abstained
B．acquitted
C．admonished
D．adduced
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