单项选择题

The United Nations Conference on Drug Abuse, which took place earlier this year in Vienna, was a very ______ meeting.

A．compulsory
B．protective
C．productive
D．extravagant
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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
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
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