托福听力学习笔记之TPO3：lecture4

托福听力学习笔记之TPO3：lecture4

下面就让小编来为大家介绍一下这篇托福听力TPO3学习笔记的内容吧，这是小编的一些见解，以便帮助大家更加充分的理解TPO真题，希望能够给正在准备托福听力的考友们带来帮助。

一、难词注解

spectrum n. 光谱;频谱;范围;余象

radiation n. 辐射;发光;放射物

pattern n. 模式;图案;样品

composition n. 作文，作曲，作品;[材] 构成;合成物;成分

makeup n. 化妆品;组成;补充;补考

spectrograph n. 光谱仪;摄谱仪

二、长难句分析

This process was repeated over and over again for many different elements, so we can figure out the chemical makeup of another star by comparing the spectral pattern it has to the pattern of the elements in the library.而很多元素都会经历这样的过程，循环往复。这样我们就可以通过将某元素的光谱图案和光谱合集中的光谱图案进行比较，我们可以获得其他行星的化学成分。

难词释义：

repeated v. 重复;复述(repeat的过去分词)

elements n.自然力量份子要素

难句类型：

by伴随状语，定语从句

难句拆分：

by comparing 通过比较it has to the pattern of the elements in the library从句修饰前面的spectral pattern

三、考题对应考点

12.强调原则，Spectroscopy is basically the study of spectra and spectral lines of light…It makes it possible to analyze the light emitted from stars. When you analyze this light, you can figure out their distance from the earth, and identify what they are made of, determine their chemical composition.”虽然是先提的是spectroscopy，但是目的是想通过此进行化学元素的识别。When you analyze this light, you can这个才是重点。答案为C.

13.转折原则，“…If you are talking about radiation, like in the element Uranium, yeah, that’s dangerous. But radiation as a general term actually refers to anything that spreads away from its source.”先说下危害，再说是总括。but之后的是重点。答案为D.

14. 因果原则，Each pattern stands for a distinct chemical element, and so different sets or patterns of spectral lines mean that the star has a different chemical composition，由这段推断出答案。答案为B

15. “Well, a kind of spectroscopic library of elements was compiled using flame tests.

A known element, say a piece of iron for example, is heated in a pure gas flame. The iron eventually heats to the point that it radiates light”听力十三原则的强调原则，答案选A

16. Before we get into that though, it’s probably a good thing to back up a bit. 听力十三原则强调原则。答案选A

17. Any of you happened to be familiar with the Greek word for “sun”by chance”?教授提出问题Any guesses about what that element is?(让学生猜他举的例子中涉及的元素的名称)之后说的这句话，希腊语中代表太阳的词和这个元素比较的相似，所以教授这么问其实就是暗示学生问题的答案.答案选B.

听力文本结构框架：

这篇讲座主要讲的是天文学家怎么识别行星的化学元素。接下来具体分析了光谱的扩大，光谱图案和化学元素的匹配。

以上就是小编在学习托福听力TPO3中lecture4的学习笔记，大家在平时备考时也要注意经验和技巧的积累，更多的笔记内容小编稍后为您呈现。最后，小编祝大家在托福考试中取得好成绩！