托福英语 学英语,练听力,上听力课堂! 注册 登录
> 托福 > 托福听力教程 > 托福听力短文 >  列表

托福听力短文 II-09-1

所属教程:托福听力短文

浏览:

gewei

随身学
扫描二维码方便学习和分享
http://online2.tingclass.net/lesson/shi0529/0008/8562/0091.mp3
http://image.tingclass.net/statics/js/2012

(MA) Look at our topographical map and you'll see that the middle third of the North American continent --- from the Rocky Mountains almost to the Mississippi River --- is pretty flat. This is the Great Plains. This kind of area is sometimes called a prairie, sometimes a steppe. That's [ess-tee-ee-pee-pee- ee]. The defining features are level terrain, dry climate, and an absence of trees. The Great Plains are actually the former bed of shallow inland sea. Over millions of years, sediment left by glaciers, water, and wind smoothed out the dry sea bed.

As I said, the Great Plaints are bordered on the west by the Rocky Mountains. And it's really the Rockies that are responsible for the formation of the grasslands. The mountains are so high that they block the heavy moist air traveling eastward form the Pacific Ocean. Lighter, drier air passes over the mountains. Until people intervened with irrigation and farms, only grass could grow on the dry, windy plain. In fact, we can divide the Great Plains into three zones. In the west, where it's driest and windiest, the grass is very short. In the eastern zone, there's more rain and grass grows as high as 360 centimeters. In the middle third, there's a mix of grass species that grow to an intermediate height.

内容来自 听力课堂网:http://www.tingclass.net/show-8562-246338-1.html
用手机学英语,请加听力课堂微信公众号:tingclass123
用户搜索

疯狂英语 英语语法 新概念英语 走遍美国 四级听力 英语音标 英语入门 发音 美语 四级 新东方 七年级 赖世雄 zero是什么意思

  • 微信公众号:每日托福
  • [微信扫码,即可关注]
  • 关注有惊喜,经典托福资料免费送! 每天的精彩内容,不容错过。
  • 频道推荐
  • |
  • 全站推荐
  • 广播听力
  • |
  • 推荐下载
  • 网站推荐
0.078125