单项选择题

The San Andreas fault is ______.

A．an active fault system
B．a place where earthquakes have been predicted accurately
C．a place where earthquakes have been controlled'
D．the location of the Rocky Mountain
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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 did scientists learn about earthquakes at the Rocky Mountain Arsenal
A．They occur at about 4,000 meters below ground level.
B．The injection of water into earthquake faults prevents earthquakes from occurring.
C．They are usually caused by the oil in the faults.
D．Harmful earthquakes can be possibly prevented by causing small, harmless earthquakes.
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