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 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.

答案D

解析细节题。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．告诉了我们正确答案。

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考研英语一

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

考研英语一

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Fordecadesthemarketforexpensiveheadphoneswasmainlylimitedtohi-fifans.But【C1】________theboxystereosysteminthec

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