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
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
单项选择题
Many great scientists ______ their success to hard work.
A．portray
B．ascribe
C．impart
D．acknowledge
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