单项选择题

The New Madrid fault is______.

A．a horizontal fault
B．a vertical fault
C．a more serious fault than the San Andreas fault
D．responsible for forming the Mississippi River
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单项选择题
This passage implies that ______.
A．horizontal faults are more dangerous than vertical faults
B．vertical faults are more dangerous than horizontal faults
C．earthquakes may occur around fault areas
D．California will break into pieces by an eventual earthquake
单项选择题
This passage is mainly about ______.
A．the New Madrid fault in Missouri
B．the San Andreas and the New Madrid faults
C．the causes of faults
D．current scientific knowledge about faults
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