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  3. Sleeping Giant Right now, an eruption is brewing (酝酿) in Yellowstone National Park (黄石国家公园). Sometime during the next two ho

Sleeping Giant Right now, an eruption is brewing (酝酿) in Yellowstone National Park (黄石国家公园). Sometime during the next two ho

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问题                         Sleeping Giant
    Right now, an eruption is brewing (酝酿) in Yellowstone National Park (黄石国家公园). Sometime during the next two hours, the park’s most famous geyser(间歇泉), Old Faithful, will begin gurgling (潺潺地流) boiling water and steam. (46)
    Old Faithful is not only a spectacular sight; it’s also a constant reminder that Yellowstone sits on one of the largest volcanoes in the world. If you have never heard of Yellowstone’s volcano, you are not alone. (47) Yet it has erupted three times during the last 2 million pears. And one of those eruptions spewed (喷涌) enough volcanic ash and other debris to blanket half the United States.
    Yellowstone’s volcano is sometimes called a "super volcano", or extremely large and explosive calderas(破火山口)volcano. (48) This super volcano formed over a hot spot, an extremely hot area in Earth’s mantle(地幔). John Valley, a volcano professor, said that as the crust moves across a hot spot, the hot spot melts a section of the plate moving over it, forming "one volcano after another".
    The Yellowstone hot spot melts thick continental(大陆的) crust, which may cause catastrophic (灾难性的) eruptions. According to experts, the eruptions that created each of the three calderas in and around Yellowstone National Park were larger than any other volcanic eruption in recorded history. The most recent eruption, which happened 640, 000 years ago, produced at least 1, 000 cubic kilometers of ash and debris and blanketed most of the western half of the United States. (49)
    Geological evidence shows Yellowstone has blown its stack every 700, 000 years or so. "If nature were truly that regular and reliable, we would be due for another eruption soon, " said Valley. "However, these processes are subject to variability(可变性的), so we don’t really know when the next eruption will happen. "
     (50) It is the volcanic energy that powers the geysers and hot springs, creates the mountains and canyons(峡谷) and generates the unique ecosystems that support Yellowstone’s diverse wildlife.
A. Three calderas make up more than a third of Yellowstone National Park.
B. The first Yellowstone eruption, 2 million years ago, released more than double that amount of ash and debris.
C. The volcano is so inconspicuous (不显眼的) that few people know it exists.
D. Then, an enormous fountain will shoot high into the air.
E. While the active geologist processes at Yellowstone do pose some risk to the public, they also make it a unique treasure.
F. Yellowstone National park at trams the interest of geologists the world over.
选项
答案E
解析 本题考查的是对上下文之间的意义关系的理解及对文章细节的把握。空格(50)所在段的前面两段介绍了黄石公园火山以前爆发时的可怕情景。其所在段叙述了火山能量带来的好处。这是两种情景截然相反的描写，中间很可能缺少一句能把它们连接起来过渡句。选项E就是过渡句，应该是本题的答案。
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