单项选择题

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

A．heated
B．scalded
C．sterilized
D．burned
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单项选择题
Rock climbing is so popular now that many people are able to ______ the steepest face with great agility.
A．scale
B．surpass
C．overcome
D．mount
单项选择题
When he realized the true nature of the proposal, he ______ all communication with the group.
A．converted
B．reverted
C．severed
D．made
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