这篇比较简单，地理中有一篇和这个是同一话题。

读了一遍就能读懂，开心中

从侧面说明方法貌似是正确的。。。

但是不熟悉的话题还是听的想自杀~~~~

1 H) `' R( a5 y* \  v" r

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Questions 47 through 50.

Listen to part of lecture in geology class.

I'm glad you brought up（提出） the question of our investigation（调查，研究） into the makeup（结构） of earth's interior（内部）.In fact,since this is the topic of your reading assignment for next time-Let me spending these last few minites of class talking about it.There were several important discoveries in the early part of this century that helped geologies develop a more accurate picture of the Earth's interior.

The first keep key discoveries had to do with seismic waves（地震波）-Remember,they are vibrations（震动，颤动） calls caused by earthquakes.Well,scientists found that they traveled thousands of miles through the earth interior.This finding enabled（使能够） geologists to study the inner parts of the earth.You see,these studies review revealed（显示） that this these vibrations were of two types.compression（压缩） or P waves and shale shear（压缩，折断） or S waves.And the researchers found that P waves travel though both liquids（液体） and solids（固体）,while S wave travel only through solid matter（固体物质）.

In 1906,that a British geologist discoveried that h*
0 n+ c& c9 o0 l! BP wave slowed down（速度减慢） and at a certain depth but kept travelling deeper.On the other hand,S waves either disappeared or reflected back.So he concluded that the depth marked（标记） the boundary between the a solid mantle（地幔） and a liquid core（地核）.Three years later,another boundary was discoveried,that between the mantle and Earth's crust（地壳）.

There's still a lot to be learned about the Earth.For instance（例如）,geologists know that the core is hot.Evidence of this is the molten（融化的） lava（熔岩） that flows out volcanoes（火山）.But we are still not sure what the source（来源） of the heat is.

楼主做得好详细啊～～ 真是让我惭愧啊～! v$ W, d* c9 z+ `! o
我现在也基本算是脱产学习了～ 一起好好加油！！！～

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Questions 47 through 50

Listen to the beginning of a talk on astronomy.

Most people think of astronomers(天文学家) as people who spend their time in cold observatories（天文台） peering（凝视） through telescope every night.In fact,a typical（典型的） astronomers spends most of his or her time analysing data and may only be at the telescope a few weeks of the year.Some astronomers were found p* s* work on purely（完全的） theoretical（理论的） problems and never use a telescope at all.

You might not know all how rarely（很少的） images are viewed directly through telescopes.The most common（普通，常用） way to observe the skies is to photograph（照相） of them.The process is very simple.First,a photographic（照相的） at plate（金属板） is cold coated（涂上一层） with light-sensitive material（感光材料）.The plate is positioned（固定的） so that the images received（接受） by the telescope is recorded on it.Then the image can be developed,at larged enlarged（放大）,at and published,so that many people can study it.

Because most astronomical object（天体） are very remote（遥远的）.The light we receive from a miss r* them is rather feeble（微弱的）.But by use a telescope at as a camera,long time exposures（定时曝光） can be made.In this way,objects can be photographed that are a hundred times too faint（暗淡） to be seen by just looking through a telescope.

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Questions 39 through 42.

Listen to a talk by a instructor(教师) in a biology laboratory(生物实验室).

Before we start our first lab,I'd like to tell you a little bit about the workbook(练习册) will we'll be using.

The first thing I'd like to point out(指出) is that the workbook contains a very large amount of(大量) material-Far more than you can could ever handle(处理) in a single semester.What you're supposed to(应该) do is choose the experiments and activities that you want to do-within a certain framework(框架,结构),of course.Part of my job is to help you make your choices.

Next,I'd like to mention that in each workbook chapter,there are usually two subsections(小部分).The first is called "experiments" and the second is called "activities".

In the "experiments" section,the workbook gives four full instructions(指示,说明) for all these the experiments,including alternate(预备的) procedures(程序).Choose the procedure you wish-there is plenty of equipment(装备,设备) available.

In the "activity" section,you will find suggestions(建议) for projects that you could can do on your own time.You'll see that there are usually note no detailed(详细的) instructions for the activities-You are supposed to do them your own way.

If there no questions,let's turn to chapter one now.

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Questions 43 through 46.

Listen to a radio broadcast about sleep.

Do you have trouble sleeping at night?Then maybe this is for you.When you worry about the meeting needing（必需的） sleep and toss（摇晃，辗转反侧） and turn trying to find a comfortable position.We're You're probably only making matters of worse.What happensed when you do that,is that you heart rate actually increases,making it more difficult to relax.

You may also have some bad habits that contribute to the problem.Do you rest frequently during the day?Do you get virtually（实际上） know no exercise or do you exercise strenuously（努力的，奋发的）
$ N0 i7 N3 E" ?% J/ b$ L1 dlate in the day.Are you preoccupied（全神贯注的） with sleep or do you sleep late on weekends?Any or all of these factors（因素） might be leading to your insomnia（失眠）by disrupting（破坏） your body's natural rhythm(身体的自然节奏).

What you should you do,then,on those sleepless nights?Don't bother the with（为..而费心） sleeping pills(药片),they can actually calls cause worth worse insomnia later.The best thing to do is drink milk or eat cheese(奶酪) or tuna fish(金枪鱼).These are all r* and m* know a rich in amino acids(氨基酸) and help produce at the n* transmitting neurotransmitter(神经传递素) in the brain that induces(引起) sleep.

This n* transmit neurotransmitter will help you relax,and you'll be on your way to get in getting a good night's sleep.Until to moral tomorrow's broadcast this is has been another in a the series hence "Hints(贴士) for good health".

楼主加油 我们在此分享痛苦和喜悦共同进步....

我也在听这个，打算今天能听5篇，加油～～ 9 U, ^# E4 d1 F  f3 f
看楼主的笔记能学到不少东西，无以回报，每天来帮你顶吧，也算是一种对自己的监督。

我又来听写了，楼主今天没有贴新贴啊～～