单项选择题

The fire extinguisher uses a chemical ______ rather than water.

A．foam
B．foil
C．fraud
D．fuse
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单项选择题
The delta is where the rivers ______ and flow into the bay.
A．confront
B．converge
C．contend
D．contrive
单项选择题
If you get into a bath full of water, some of the water will ______ onto the floor.
A．overthrow
B．overtake
C．overwhelm
D．overflow
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