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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单项选择题
After a meal in a restaurant, you ask the waiter for the______.
A．bill
B．note
C．receipt
D．menu
单项选择题
The prisoner has been ______of many privileges that average citizens enjoy.
A．ensured
B．informed
C．deprived
D．convinced
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