托福听力30天备考计划3 TPO3, Lecture4

>>托福听力备考：托福听力30天备考计划TPO3, Lecture4

单句听写学习方法操作：

1. 听写全文;单句：要求每个句子在听三遍以后写下来

2. 听写之后对比，找出错误原因

3. 跟读全文，背诵场景词汇

4. 熟读全文2遍

5. 加速听原文3遍

6. 常速听一遍

7. 脱稿录音(不看原文做单句重复)

Day 3rd 听力学习TPO3 中最难的一篇Lecture4分析

本文难点：复杂的场景词汇和生僻的背景知识;

听力内容：光谱学用于鉴定艺术作品或考古发现;物质元素鉴定

how astronomers identify the chemical element in a star

文章结构如下：

1)开篇引出主题对象：spectroscopy(spectrum; spectral;)

Now astronomy didn’t reallybloom into the science it is today until the development of spectroscopy. 注意下定义解释：信号词basically (用于下定义)解释spectroscopy：light决定chemical composition

Spectros copy is basically the study of spectra and spectral lines of light, and specifically for us, the light fromstars.

2)中途暂停，回顾过去：back up a bit

Before we get into that though, it’sprobably a good thing to back up a bit.

过渡信号(互问互答-考点)

3)Anyone want to takea stab at the scientific term for visible light? And I’m sure all of you know this because you all did the reading for today.多次问答最后重点总结：(标志词so)

Each pattern stands for a distinct chemical element, and so different sets or patterns of spectral lines mean that the starhas a different chemical composition.

4)最后重点：了解flame test: to cause anelement to emit light

本文词汇及相关补充

spectroscopy光谱学; Spectra谱，光谱，频谱;范围，幅度;

Emit; prism n.棱镜;(结晶)柱; a beam ofsunlight;

Spectrum-continuous band of rainbow colors;

Optical radiation; Uranium; Violet; Magnify; Flametest;

Spectrograph; Helium; break up(散开);compile

Back up a bit

Match up(component/composition); bloom蓬勃发展; be exposed to

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