单项选择题

The firm ______ in producing cheap transistor radios.

A．exerts
B．excels
C．energizes
D．exploits
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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
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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