2017年职称英语 考试 报名|2017年职称英语(理工类)补全短文文章及译文5

Sleeping Giant
　　Right now, an eruption is brewing in Yellowstone National Park. Sometime during the next two hours, the park's most famous geyser, Old Faithful, will begin gurgling boiling water and steam. ____1____
　　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've never heard of Yellowstone's volcano, you’re not alone. ____2____ Yet it has erupted three times during the last 2 million years. And one of those eruptions spewed enough volcanic ash and other debris to blanket half the United States.
　　Yellowstone's volcano is sometimes called a "supervolcano” or extremely large and explosive caldera volcano. ____3____ This supervolcano formed over a hot spot, an extremely hot area in Earth's mantle. 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 crust, which may cause catastrophic 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, which blanketed most of the western half of the United States. ____4____
　　Geological evidence shows Yellowstone has blown its stack every 700,000 years or so.1 “If nature were truly that regular and reliable, we would be due for another eruption soon,2” said Valley. "However, these processes are subject to variability, so we don't really know when the next eruption will happen.”
　　____5____It is the volcanic energy that powers the geysers and hot springs, creates the mountains and canyons, and generates the unique ecosystems that support Yellowstone's diverse wildlife3.
　　词汇：
　　brew 酝酿
　　Yellowstone National Park黄石国家公园
　　geyser 间歇泉 gurgle 汩汩地流 spew 喷涌
　　caldera 火山口洼地 crust 地壳
　　mantle 地幔 continental 大陆的
　　catastrophic 灾难的 variability 可变性 canyon 峡谷

2017年职称英语(理工类)补全短文文章及译文5.doc

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