单项选择题

Earthquake belts are ______.

A．maps that show where earthquakes are likely to occur
B．zones with a high probability of earthquakes
C．breaks between two sections of the earth's surface
D．the two layers of earth along a fault

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单项选择题

What can be said about the experiments at Rocky Mountain Arsenal

A．They have no practical value in earthquake prevention.
B．They may have practical value in earthquake prevention.
C．They are certain to have practical value in earthquake prevention.
D．The article does not say anything about their practical value in earthquake prevention.

单项选择题

What is the most appropriate title for the passage

A．Dangers of Earthquakes.
B．Earthquake Belts and Prediction.
C．Earthquake Prediction and Control.
D．Earthquake Engineering in California.