英语听力：探索发现 2012-09-28 长毛象王国 Mammoth—9
时间：2014-01-24 06:55:57
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（单词翻译）
This is Alaska today, a wetland of forests, boggy1 tundra2, lakes and rivers — rivers that still churn out fresh clues to the Ice Age past. This is a brick-sized tooth, and it belong to a woolly mammoth3. Its narrow ridges4 of enamel5 tell us more about how mammoths lived.
Studies of modern elephants suggest that the more grass you eat, the more ridges you need. And mammoth’s teeth have even more ridges than those of any elephants. It seems that mammoths fed almost exclusively on grass. They were
gargantuan6 grazers.
Fossil bones help draw a picture of another well-known grazer, a kind of horse. Wild horses live in small
herds7. And Beringia would have been the scene of vicious battles between rival stallions.
But Beringia’s horses are now gone. Today their closest living relatives roam the open steppes of central Asia. Like mammoths, horses are predominantly grazers.
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