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
Although the work needs to be done more exhaustively, efforts have been made to collect the songs and ballads of the American Revolution.
A．precisely
B．selectively
C．frantically
D．thoroughly
单项选择题
There are still some outdated prejudices lurking in the minds of individuals.
A．existing
B．hiding
C．remaining
D．emerging
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