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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When he realized the true nature of the proposal, he ______ all communication with the group.
A．convert
B．reverted
C．severed
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If you call the 911 emergency number, they will ______ firemen, policemen, and paramedics immediately.
A．assign
B．detach
C．attach
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