T P O听力的原文内容成为了考生们备考的关键。如此在实际的备考过程中，T P O听力的原文内容，针对大家听力的基础复习，分数提升是有一定帮助的。所以在此老师带来了托福t p o听力原文文本汇总。
托福t p o听力原文文本汇总一：
Title: New evidence of River Hypothesis
Listen to part of a lecture in a geology class.
Professor: About 30 years ago, that’s C-O-T-T-E-R, published a paper that contained a very interesting hypothesis.
He was studying ancient rivers in the North American mountain chain. And he noticed that about 450 million years ago, rivers started to behave differently. Before then, and that’s actually how rivers behaved till these days.
So why might this change have happened?[a1]
Student: Maybe there was some kind of a climate shift?
Student: Was the change worldwide? Or just in that geographical area?
Student: So there was no plant life before 450 million years ago?
In a recent study, a couple of researchers gathered together the existing data and combine them with their own new field data to get a comprehensive picture of the situation.
Their study was specifically designed to identify changes in the shapes of rivers during the time period when vegetation was evolving.
And when the researchers compared the data about river shapes with data they have collected about plant life from the same period, the data seemed to prove Cotter’s hypothesis.[a3]
托福t p o听力原文文本汇总二：
Student: OK, but how did plant life affect rivers?
Professor: Wellwe need to look at the geological evidence.
But around the time of the rise of plant life, which in turn allowed for the creation of river banks.
And we also see evidence of a process called lateral accretion.
Lateral accretion happens when water flows around the curve or bend in the riverbed. Now the speed of the flow on the outside of the bend is fastest, and slowest on the inside of the bend. This sets up what’s called the secondary flow across the river bottom. The fast flowing water on the outside of the bend digs out material from the riverbank and pushes these material laterally across the bottom, on the inner side of the bend.
以上是关于托福t p o听力原文文本汇总的内容，希望文章里的这些信息考生们能认真的阅读，如果是想再了解其它方面的信息，请点击咨询上海环球教育官方网站。咨询电话：400-820-0602。
|托福优享基础班(封闭)||50 ≤ Mini Test < 70的学员||在线咨询|
|托福大学生强化班||70 ≤ Mini Test < 90的学员||在线咨询|