课程咨询

托福考试网 托福资料下载 托福资讯 0元讲座 水平测试

托福考试练习
新东方在线 > TOEFL > 托福听力 > 正文
托福培训

扫码免费领资料

内含托福全科备考资料

更有免费水平测试及备考规划

托福培训

扫码关注掌握一手留学资讯

回复XDF免费水平测试

录播精讲 直播课HOT

托福听力练习-科学美国人60秒:雨林与爬虫的生态平衡

2017-06-10 09:27:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：雨林与爬虫的生态平衡

　　科学美国人60秒听力练习：雨林与爬虫的生态平衡

　　科学美国人60秒英文文本

　　The November 26th issue of the journal Science included a study showing that the extinction of the dinosaurs some 65 million years ago allowed puny mammals to get really big. But well before all that happened, another event triggered a different burst of evolutionary activity.

　　A new study finds that about 300 million years ago, the tropical rainforests along the equator fell apart. The familiar culprit—global warming.

　　Present-day Europe and North America were on the equator back then, and were covered with rainforests. But global warming made things even hotter and drier.

　　The expansive rainforests broke up into smaller fragments, and reptile populations became isolated from each other in the fragments. Such geographical isolation allows different populations to evolve in different directions, which led to a great increase in reptile diversity. The research appears in the journal Geology. [Sarda Sahney, Michael Benton, and Howard Falcon-Lang, "Rainforest collapse triggered Carboniferous tetrapod diversification in Euramerica"]

　　The explosion in reptiles ultimately led to the evolution of the dinosaurs, which dominated the planet until they fell victim to the massive impact that allowed us mammals to take over. As Vonnegut would say, so it goes.

　　—Steve Mirsky

　　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

上一页 1 2 下一页

托福辅导

关注新东方在线托福

托福机经·Official题目练习

考前重点突破·听说读写海量资料

更多资料

关注新东方在线托福，
回复【XDF】获取大礼包

托福辅导
  • 1.打开手机微信【扫一扫】，识别上方二维码；
  • 2.点击【添加】，回复对应关键字领取学习资料。
更多>>
更多内容

免费获取托福备考大礼包

微信扫描下方二维码 立即领取

托福辅导
更多>>
更多公益讲座>>
更多>>
更多资料
托福TPO 托福听力练习 托福口语练习 托福阅读练习 托福写作练习
我要
反馈 返回
首页
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10