英语听力：探索发现 2012-11-18 美洲大平原 American Serengeti—10

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These people knew how to make lethal⁵ weapons. They let spear points, knife blades and other tools scattered⁶ all across the plains. And they spread fast. The evidence suggests it took them only 1,000 years to spread across the entire northern continent. 

 

What can we learn today about the lifestyle of these butchers of the plains? They left a stream of clues to how they lived, including strange pyramids of rocks. Inside are bones of animals that show how they were slaughtered⁷ and cut up for meat. These cares are thought to be cold-weather larders⁸, marking prehistoric⁹ hunting camps. When hunting parties had more meat than they could eat or carry, they would stash¹⁰ the surplus under these rocks to be collected later. They seemed to have used bones as markers.

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