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What did scientists learn about earthqua
题目内容:
[单选题]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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