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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单项选择题
Federal troops were-used to ______ a crowd that tried to storm the jail.
A．deteriorate
B．disperse
C．dissipate
D．drain
单项选择题
When you look at them, you imagine your eyes aching in the intense ______ of the desert in heat.
A．flare
B．glitter
C．glare
D．spark
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