单选题
What did scientists learn about earthquakes at the Rocky Mountain Arsenal?
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.
【正确答案】
D
【答案解析】
[试题分析] 本题为推理题。
[详细解答] 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D项描述是正确的。
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