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

游客2023-10-22  23

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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