单项选择题


A．preoperation
B．preoccupation
C．premonition
D．preoption
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单项选择题
If a substance is dissolved in water or heated, it may ______ a gas.
A．give into
B．give off
C．give over
D．give away
单项选择题
A．relianceB．reliabilityC．reliefD．relevancy
A．reliance
B．reliability
C．relief
D．relevancy
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