单项选择题

The first step before making any decision to ______ was to determine exactly who did the killing.

A．interact
B．integrate
C．intervene
D．intensify
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单项选择题
Grace couldn't resist the ______ to skip work and go down to the beach.
A．impulse
B．momentum
C．stimulation
D．surge
单项选择题
Prices ______ , in response to harvests, natural disasters and political instability; and when they rise, it takes some time before new sources of supply become available.
A．vibrate
B．fluctuate
C．flutter
D．swing
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