标签：prairie 相关文章

英语听力：探索发现 2012-11-16 美洲大平原 American Serengeti—9

Bison calves are born in summer and can run within a few hours of their birth. They have no choice. The herd won't wait in its eternal quest to find new grazing. Smaller grazers are still found here, too. But they stay put instead of wandering the pl

发表于:2019-01-23 / 阅读(67) / 评论(0) 分类 探索与发现2012年

英语听力：探索发现 2012-11-23 美洲大平原 American Serengeti—12

Because these two bull mammoths both had broken tusks, they could have fought at closer quarters than they would do normally. Twisting and turning, they became locked in a deadly embrace. Even more bizarre, this twist of fate then caused a third fata

发表于:2019-01-23 / 阅读(163) / 评论(0) 分类 探索与发现2012年

英语听力文摘 English Digest 74、干旱的成因

For those of us lucky enough to always have enough food and water, it may be hard to imagine living through a drought. A drought occurs for a variety of reasons, usually including a lack of rainfall and warm temperatures.Soil moisture severely dwindl

发表于:2019-01-26 / 阅读(82) / 评论(0) 分类 英语听力文摘 English Digest
最新学习文章
热门学习文章