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
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
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
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