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托福听力原文文本TPO内容解析

2019-09-05 23:07| 来源:环球托福

摘要: 托福听力备考练习里的TPO练习对于考生们有很大的帮助,本身TPO和真正的考试是很像,所以大家在实际的练习里可以利用TPO进行备考复习
留学英语在线测试

  托福听力备考练习里的TPO练习对于考生们有很大的帮助,本身TPO和真正的考试是很像,所以大家在实际的练习里可以利用TPO进行备考试复习,还能帮助大家更好的提升听力的水平。那么接下来带来了托福听力原文文本TPO内容解析。

  托福听力原文文本TPO内容解析1、Professor: Ok, let’s get started. Great, today I want to talk about a way in which we are able to determine how old a piece of land, or some other geologic feature is - dating techniques. I’m going to talk about a particular dating technique. Why? Good dating is a key to good analysis. In other words, if you want to know how a land formation was formed, the first thing you probably want to know is how old it is. It’s fundamental.

  Um… Take the Grand Canyon for instance. Now, we geologists thought we had a pretty good idea of how the Grand Canyon in the southwestern United States was formed. We knew that it was formed from sandstone that solidified somewhere between 150 and 300 million years ago. Before it solidified, it was just regular sand. Essentially, it was part of a vast desert.

托福听力原文文本

  And until just recently, most of us thought the sand had come from an ancient mountain range fairly close by that flattened out over time. That’s been the conventional wisdom among geologists for quite some time. But now we’ve learned something different, and quite surprising, using a technique called Uranium-Lead Dating.

  托福听力原文文本TPO内容解析2、I should say that Uranium-Lead Dating has been around for quite a while. But there have been some recent refinements. I will get into this in a minute. Anyway, Uranium-Lead Dating has produced some surprises. Two geologists discovered that about half of the sand from the Grand Canyon was actually once part of the Appalachian Mountains. That’s really eye-opening news, since the Appalachian Mountain Range is, of course, thousands of kilometers to the east of the Grand Canyon. Sounds pretty unbelievable, right?

  Of course, the obvious question is how did that sand end up so far west? The theory is that huge rivers and wind carried the sand west where it mixed in with the sand that was already there. Well, this was a pretty revolutionary finding. Um… and it was basically because of Uranium-Lead Dating. Why?

  Well, as everyone in this class should know, we usually look at the grain type within sandstone, meaning the actual particles in the sandstone, to determine where it came from. You can do other things too, like look at the wind or water that brought the grains to their location and figure out which way it was flowing. But that’s only useful up to a point, and that’s not what these two geologists did.

  以上是关于托福听力原文文本TPO内容解析,希望文中的这些信息大家要认真的阅读,倘若想要知道更多其它方面的信息,请点击咨询上海环球教育官方网站。咨询电话:400-820-0602。