单项选择题

Without a sure supply of water, fanning in that area remains at the ______ of the weather.

A．disposal
B．risk
C．cost
D．mercy
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单项选择题
You said the post office is on this block, can you be a bit more ______
A．particular
B．specific
C．abstract
D．especial
单项选择题
The price of fresh vegetables ______ according to the weather.
A．fluctuates
B．increases
C．soars
D．maintains
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