单项选择题

A．An opening speech of a lecture.
B．The text of the economist’s speech.
C．A discussion on inflation and investment.
D．The interpretation of the phrase "economic depression".
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单项选择题
A．At a drug store.B．At a university.C．On the street.D．In an airplane.
A．At a drug store.
B．At a university.
C．On the street.
D．In an airplane.
填空题
The most important element for an economic system is ______.
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