这节课主要从上节课的单词复习，客户说那个听力材料的单词和课上听力材料的分析几个方面入手来和大家分析。现在就跟着百利天下小编一起来学习吧!
一.回顾上一节课单词
Origin，solar system，mystery，keep in mind, be consistent with, iron, iron corn, other than, be composed of, mineral, similarity, share with, Capture Theory, propose
gravitational force ,improbable, assume, composition, promising, be referred to as, Mars Theory, molten, be struck by, melt, chunk, earth’s crust, thrown out, account for, moon
二.学习本节课单词
Flat平的,disc圆盘,philosopher哲学家 ,observation观察,heavenly body 天体,eclipse月食,shadow影子,spherical球状的, put forward提出，circle圆,stretch out伸出,ellipse椭圆,North Star北极星,Polaris北极星,appear出现,by the way顺便提一下,apparent明显的,calculate计算，approximate大约的,distance距离,circumference圆周,record记录,document文档,stadia体育场,plural复数,estimate估计,telescope望远镜
三.课上听力材料分析
1.key points
The shape of the Earth-two arguments against Flat Earth-the shape of the shadow-the position of the North Star
2.注意
Q1：what is the lecture mainly about?
听力原文：In ancient times, many people believed the earth was a flat disc. Well over 2,000 years ago, the ancient Greek philosophers were able to put forward two good arguments proving that it was not.古希腊时期，人们认为地球是一个大的圆盘。但是大约2000年前，古希腊的哲学家提出了地球不是圆的。
因此可以概括出Q1的答案：Arguments proving that the earth was nor a flat disc.
接着，我们继续听听力原文。Direct observation of heavenly bodies was the basis of both these arguments.
Q2:What arguments have been shown to us?
听力原文：
Part1(1)
First, the Greeks knew that during eclipses of the moon, the earth was between the sun and the moon, and they saw that during these eclipses, the earth's shadow on the moon was always round, they realized that this could be true only if the earth was spherical.月食期间，地球照在月亮上的影子一直都是圆的，这个时候，它们就意识到只有地球是球状体的时候，这种现象才是成立的。
If the earth were a flat disc, then its shadow during eclipses would not be a perfect circle, it would be stretched out into a long ellipse.
如果地球是平的，那么它的影子应该是椭圆的而不是圆的。
其实古希腊的学者亚里士多德认为，根据月食的景象分析认为，月球被地影遮住的部分的边缘是圆弧形的，所以地球是球体或者是近似球体。
Part2(1)
The second argument was based on what the Greeks saw during their travels. They noticed that the North Star, or Polaris, appeared lower in the sky when they traveled south, in more northerly regions, the North Star appeared to them to be much higher in the sky.通过北极星在天空中的位置来看，当他们往南走的时候觉得北极星比较低，但是往北走的时候，就比较高。
Part2(2)
By the way, it was also from this difference in the apparent position of the North Star that the Greeks first calculated the approximate distance around the circumference of the earth, a figure recorded in ancient documents says 400,000 stadia, that's the plural of the word stadium.
Part2(3)
Today, it's not known exactly what length one stadium represents, but let’s say it was about 200 meters, the length of many athletic stadiums.现在，我们并不知道stadium代表的是什么，但是我们可以say it是200米，大约是一个足球场那么大。
This would make the Greek's estimate about twice the figure accepted today, o very good estimate for those writing so long before even the first telescope was invented.但是他们测算的误差，但是这确实是一个很好的估算。
因此，我们可以得出Q2的答案，If the earth were a flat disc ,its shadow during eclipses would be stretched out into a long ellipse.
North Star, or Polaris, appeared lower in the sky when they traveled south, in more northerly regions, it appeared to be much higher in the sky.
3.Key points
Arguments proving that the earth was not a flat disc,以及两点the earth’s shadow during eclipses, the position of the North Star.
以上就是百利天下小编要和大家分享的托福听力备考中的关于地球的听力讲座，希望可以帮助考生提升备考实力。
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