Earthquake belts are ______. The San Andreas Fault is ______.

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问题 Earthquake belts are ______.
The San Andreas Fault is ______.

选项 A、an active fault system
B、a place where earthquakes have been predicted accurately
C、a place where earthquakes have been controlled
D、the location of the Rocky Mountain

答案A

解析 细节题。根据第四段第一句To answer the first question,scientists are looking very closely at the most active fault systems in the country,such as the San Andreas fault in California的表述,不难判断正确答案。
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