托福听力课外资料练习：科学美国人60秒雨林与爬虫的生态平衡相关内容分享

2017年07月18日17:47 来源：小站整理: 参与（3）阅读（3812）

摘要：托福听力的备考十分的重要，那么你应该如何练习呢?在备考过程中除了一些真题之外，一些常用的课外资料也是十分重要的。小编经常用到的就是科学美国人60秒，下面编在这里为为大家整理了科学美国人60秒：雨林与爬虫的生态平衡相关的内容分享，希望对大家有帮助。

在托福听力考试的备考过程中，科学美国人60秒相信大家一定用得比较多，那么大家平时是如何利用这个课外资料的呢?这里小编整理了科学美国人60秒：雨林与爬虫的生态平衡相关的内容分享，大家一起来学习一下吧。

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.