单项选择题

If a price or amount ______ it keeps changing and becoming higher and lower

A．tumbles
B．tilts
C．fluctuates
D．flaps
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单项选择题
The rest ______ of this TV play will be broadcast next week.
A．prelude
B．episode
C．incident
D．accident
单项选择题
The waste pipe is blocked; try ______ it out with hot water, or just call the plumber to do it.
A．flushing
B．crushing
C．brushing
D．blushing
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