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 earthquake have been controlled
D、the location of the Rocky Mountain

答案A

解析事实细节题。参见文章第二段第一句 "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"(为了回答第一个问题，科学家们正在密切关注这个国家最活跃的断层系统，比如圣安得雷斯山断层)，可知答案为A。

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