单项选择题

It is a ______ that in such a rich country there should be so many poor people.

A．parasite
B．paradox
C．paralysis
D．parameter
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单项选择题
The fire extinguisher uses a chemical ______ rather than water.
A．foam
B．foil
C．fraud
D．fuse
单项选择题
The delta is where the rivers ______ and flow into the bay.
A．confront
B．converge
C．contend
D．contrive
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