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　　練習一

Right now，an eruption is brewing in Yellowstone National time 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 you’ve never heard of Yellowstone’s volcano，you’re not alone. 2 Yet it has erupted three times during the last 2 million 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 supervolcano formed over a hot sp extremely hot area in Earth’s 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 ing “one volcano after another.”

The Yellowstone hot spot melts thick continental crust，which may cause catastrophic rding 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 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 tes the mountains and generates the unique ecosystems that support Yellowstone’s diverse wildlife.

練習：

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.

volcano is so inconspicuous(不顯眼的)that few people know it exists.

, an enormous fountain will shoot high into the air.

e the active geologist processes at Yellowstone do pose some risk to the public，they also make it a unique treasure.

owstone National Park attracts the interest of geologists the world over

　　答案： D,C,A,B,E

　　練習二

A University of Nebraska professor has developed robotic cones and barrels.____1____ They can even be programmed to move on their own at any particular part of me day，said Shane Farritor, an assistant professor of mechanical engineering at Nebraska.

For example，if workers arrived at 6 a.m.，the cones could move from the side of the highway to block off the lane at that time.____2____ “It just seems like a very good application for robots，”Farritor said.“The robotic cones would also help remove people from hazardous jobs on the highway putting barrels and cones into place，”Farritor said in a report on his creation.

____3____ This fund allowed Farritor to work on the project with graduate students at Nebraska and his assistant Steve Goddard.

The robots are placed at the bottom of the cones and barrels and are small enough not to greatly change the appearance of the construction aides.“It would look exactly the same，”Farritor said.“Normally there’s a kind of rubbery, black base to them.____4____”

Farritor has talked with Officials from the Nebraska Department of Roads about how the robots would be most useful to what they might need.

The robots could come in handy following a ng maintenance operation，like painting a stripe on a road or moving asphalt，where now the barrels have to be picked up and moved as the operation proceeds.“That way you don’t have to block off a 10-mile strip for the operation,”Farritor said.

While prototypes have been are not in use itor said he has applied for a patent and is considering what to do next.____5____He is also thinking about marketing the robots to roads departments andthers across the country wh07 may benefit from them.

　　練習：

they can return to the original place at the end of the day.

is thinking about starting a small business.

itor was“Inventor of the Year”in 2003.

on the idea began in 2002 using a National Academy of Sciences grant.

replace that with a robot.

e robotic cones and barrels can move out of the way，or into place，from computer commands made miles away.

　　答案： F,A,D,E,B