单项选择题

An explanation of an earthquake is a description of the chain of ______ that produces it.

A．causality
B．margin
C．persistence
D．purpose
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单项选择题
The economy is showing signs of ______.
A．halting
B．overflowing
C．outbreaking
D．faltering
单项选择题
In that country the coins are so ______ that one has to carry great quantities to make a single purchase.
A．diminished
B．debased
C．degraded
D．defaced
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