Passage Two [br] What are the experts at the Observatory most concern ed about?I

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问题 Passage Two [br] What are the experts at the Observatory most concern ed about?

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答案 If the Yellowstone volcano will erupt again．／When the Yellowstone volcano will erupt (again)．

解析第13、14段表明专家担忧的是黄石国家公园的火山是否会再次爆发，或者说什么时候会再爆发，本题答案应表达出这种意思。

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