单项选择题

If the world is to remain peaceful, the utmost effort must be made by nations to limit local ______ .

A．collisions
B．combats
C．contradictions
D．conflicts
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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
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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