单项选择题

Our reporter has just called to say that rescue teams will _______ to bring out the trapped miners.

A．effect
B．affect
C．conceive
D．endeavor
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单项选择题
Students are expected to be quiet and _______ in an Asian classroom.
A．obedient
B．overwhelming
C．skeptical
D．subsidiary
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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