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 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

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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