单项选择题

The basic causes are unknown, although certain conditions that may lead to cancers have been ______ .

A．identified
B．guaranteed
C．notified
D．conveyed
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单项选择题
Once the vice - chancellor of a university is ______ , he begins his term of office.
A．launched
B．commenced
C．inaugurated
D．initiated
单项选择题
Most nurses are women, but in the higher ranks of the medical profession women are in a ______ .
A．scarcity
B．minority
C．minimum
D．shortage
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