With what topic is the passage primarily concerned? The word "they" (Para. 1, Line 2) refers to ______.

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问题 With what topic is the passage primarily concerned?
The word "they" (Para. 1, Line 2) refers to ______.

选项 A、fields
B、intervals
C、eruptions
D、enemies

答案C

解析分析第一段第2句的句子结构，“as”引导从句，从句主语和前半句的主语一致，则“they”应代表“eruptions”，所以应选C。

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