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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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
单项选择题
It is one thing to locate oil, but it is quite another to ______ and transport it to the industrial centers.
A．permeate
B．extract
C．distinguish
D．concentrate
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