单项选择题

The National Institute of Mental Health is conducting a far-reaching research to determine the psychological effects of using drug.

A．extensive
B．refined
C．prevalent
D．tentative
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单项选择题
The prehistoric art of inscribing figures and designs on rock surfaces seems to have slowly disappeared with the advent of agriculture, which required a large amount of time and energy.
A．coming
B．arrest
C．financing
D．stability
单项选择题
The atmosphere in the police chief's office was electric with contention.
A．discord
B．rejoicing
C．weeping
D．curiosity
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