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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 about 4,000 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 earthquakes.
答案D
解析 本题为推理题。从文章最后二段科学家们对Rocky Mountain Arsenal的研究来看，其最终的成果是change one big earth quake into a number of small，harmless earth quakes．说明答案选项的描述是正确的。
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