学位英语

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.“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, 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 wildlife.

练习：

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 attracts the interest of geologists the world over

答案： D,C,A,B,E

针对2014年职称英语考试备考，总有另考生束手无策的疑难问题。例如，对于想参加2014年职称英语考试的新考生来说，2014年职称英语报名条件、职称英语考试科目等考试信息，你是否想详细咨询一下？如果你有意向参加中大网校职称英语考试培训，职称英语辅导优惠方案你是否想了解一下？在听课过程中，如果你对某一个知识点有疑问等，诸如此类的问题和疑惑，你都可以通过职称英语考试你问我答平台，发起你的疑问，届时，中大网校职称英语培训顾问及资深命题专家将在第一时间解答你的疑问。中大网校考试知道，总有人知道你问题的答案，详情请查看>>