【科学60秒】历史提前百万年_英语听力练习mp3下载-科学-沪江听力酷

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【科学60秒】历史提前百万年

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There’s nothing like a good steak. And our Australopithecus afarensis ancestors apparently felt the same way. Because new discoveries from Ethiopia show that what was likely the species of the famous fossil Lucy used stone tools to ____1____ meat from big mammals—about 3.4 million years ago. That’s a million years earlier than our best previous evidence for human ancestor stone tool use and meat eating. The finding appears on the cover of the journal Nature.
The research team found two fossil bones with cut and scrape marks, signs of meat carving. One bone was a piece of rib from a cow-sized mammal; the other, a leg bone fragment from a mammal the size of a goat. The bones also had percussion marks, ____2____ while Lucy’s friends smashed the bones to get at the marrow.
It looks like the ancient tool users collected stones that happened to have shapes ____3____ to butchering, the way kids select particular stones with good potential to skip on water. But ____4____ will look for evidence for any attempts at ____5____. Because after 3.4 million years, Lucy and her fellow afarensis keep surprising us.