单项选择题

All of the dental instruments need to be ______ before the next patient is seen.

A．heated
B．scaled
C．sterilized
D．burned
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单项选择题
When he realized the true nature of the proposal, he ______ all communication with the group.
A．convert
B．reverted
C．severed
D．make
单项选择题
Any troop of wild animals should be approached warily.
A．fearlessly
B．confidently
C．silently
D．prudently
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