单项选择题

Professor Smith and Professor Brown will __________.in presenting the series of lectures on American literature.

A．alter
B．alternate
C．substitute
D．exchange
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单项选择题
We find it impossible to ____________ with the latest safety regulations.
A．accord
B．unify
C．obey
D．comply
单项选择题
Call your doctor for advice if the ______ persist for more than a few days.
A．responses
B．signals
C．symptoms
D．reflections
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