单项选择题

We are worried about this fluid situation full with uncertainty.

A．stable
B．suitable
C．changeable
D．adaptable
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单项选择题
The umbrella was ingeniously devised to fold up into the pocket.
A．seriously
B．cleverly
C．attentively
D．carefully
单项选择题
They have built canals to irrigate the desert.
A．decorate
B．change
C．visit
D．water
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