单项选择题

We may conclude from the passage that_____.

A．it is probably as dangerous to live in Missouri as in California
B．the New Madrid fault will eventually develop a mountain range in Missouri
C．California will become an island in future
D．A big earthquake will occur to California soon

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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