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  3. Earthquake belts are______. What did scientists learn about earthquakes at the Rocky Mountain Arsenal?

Earthquake belts are______. What did scientists learn about earthquakes at the Rocky Mountain Arsenal?

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问题 Earthquake belts are______.
What did scientists learn about earthquakes at the Rocky Mountain Arsenal?
选项 A、They occur at bout 4000 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 earthquake
答案D
解析 事实细节题。参见文章最后一段最后一句“scientists could inject some kind of fluid like water into faults and change the big earthquake into a number of small, harmless earthquakes" (科学家们能够把某种液体注入断层，从而把一次大地震转化为许多小的、无害的地震)。
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