单项选择题

The ______ of medical knowledge are being pushed farther outwards as time goes on.

A．edges
B．borders
C．boundaries
D．frontiers
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单项选择题
The police suspected that the sectary might be ______ of the murder.
A．guilty
B．conscious
C．careful
D．impatient
单项选择题
Robert Brown is a very proud person who ______ silence as contempt.
A．introduces
B．interprets
C．intends
D．interrupts
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