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TOEFL托福英语英语听力原文：
Hello. This is Greg Rice reporting for TBC News in blizzard conditions in the freezing state of Alaska. I've just arrived here in Barrow, Alaska, to bring you live coverage of what appears to be the results of a huge meteorite impact, perhaps the largest in recent history, that occurred just twelve hours ago. The exact location of the impact is unknown, but estimates put it about 20 kilometers south of Barrow based on shock waves felt throughout the region.
Some witnesses say they saw a bright light streaking through the sky, accompanied by a roaring boom, moments before the impact. It's unknown whether there are any casualties, but it is unlikely considering this sparsely populated area.
Such impacts were commonplace during the formation of our solar system, and many believe that a meteorite 10 kilometers in diameter crashed into Earth 65 million years ago which led to the mass extinction of many animal species including the dinosaurs. It is often difficult to calculate the number of such large impacts on earth because erosion and vegetation make it difficult to spot them.
In recent years, astronomers have focused more of their attention on the paths of many uncharted space rocks or asteroids floating out there in space in the hope that we might be able determine the threat they pose on mankind.
We'll keep you up-to-date on any developments here. This is Greg Rice reporting from Alaska.
