单项选择题

The __________ of forged banknotes posed a threat to our normal economic life.

A．collaboration
B．deficiency
C．circulation
D．justification
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单项选择题
In the quest to find a __________ for cancer, scientists must draw on a collective information base.
A．symptom
B．diagnosis
C．cause
D．remedy
单项选择题
We have a firm belief in our ability to overcome the obstacles which__________ us.
A．formulate
B．orientate
C．confront
D．saturate
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