单项选择题

A．changes
B．makes
C．sets
D．turns
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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
单项选择题
What did scientists learn about earthquakes at the Rocky Mountain Arsenal
A．They occur at about 4,000 metres 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 earl be possibly prevented by causing small, harmless earthquakes.
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