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托福听力练习-科学美国人60秒:面粉的起源

2017-06-23 09:54:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：面粉的起源

　　科学美国人60秒听力练习：面粉的起源

　　最新的考古表明我们的祖先在30000年前就是用含淀粉的东西来制作面粉

　　The discovery of starch remnants on stone tools indicates that our ancestors were making flour out of starchy roots 30,000 years ago. Karen Hopkin reports

　　We tend to think of cavemen as pretty serious carnivores, hunting game and then roasting the yummy bits over a roaring campfire. But scientists just reported discovering traces of starch on some ancient stone tools. Which suggests that there were probably more than a few bakers in the bunch way back when. The findings appear in the Proceedings of the National Academy of Sciences. [Anna Revedin et al., "Thirty thousand-year-old evidence of plant food processing"]

　　Researchers collected stone tools from three archaeological sites in Italy, Russia and the Czech Republic. Our Paleolithic ancestors called these digs home some 30,000 years ago. The markings on the recovered tools suggest that they were used like grindstones and pestles for processing grains. And they still contained traces of flour.

　　The flour grains came mostly from cattails and ferns, plants whose roots are rich in starch, kind of like a potato. Processing these plants probably involved peeling, drying and grinding their roots. The resulting flour could then be whisked into a dough and cooked.

　　The finding pushes back the first known use of flour by some 10,000 years. Which means that 300 centuries ago, Fred and Wilma might have had a kind of prehistoric pita bread on the menu.

　　—Karen Hopkin

　　[The above text is an exact transcript of this podcast.]

　　中文翻译请点击下一页

本文关键字: 托福听力 科学美国人60秒

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