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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单项选择题
As used in the first sentence of the fourth paragraph, the word essentially means_____.
A．greatly
B．extremely
C．basically
D．necessarily
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 occur only around fault areas
D．California will break into pieces by an eventual earthquake
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