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问题

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.

参考答案
正确答案:D
答案:D
[试题分析] 细节题。
[详细解答] 最后一句话…scientists could inject some kind of fluid like water into faults and change one big earthquake in to a number of small,harmless earthquakes.告诉了我们答案,显然,D正确。
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