托福TPO5听力文本

《托福TPO5听力文本》由会员分享，可在线阅读，更多相关《托福TPO5听力文本（11页珍藏版）》请在装配图网上搜索。

1、TPO-5Conversation 1Narrator Listen to a conversation between a student and a counselor at the UniversityCounseling Center.StudentHi, thanks for seeing me in such short notice.CounselorNo problem. How can I help?StudentWell, I think I might have made a mistake coming to the school.CounselorWhat makes

2、 you say that?StudentIm a little overwhelmed by the size of this place. I come from a small town. There were only 75 of us in my high school graduating class. Everyone knew everyone. We all grew up together.CounselorSo its a bit of a culture shock for you? Being one of 15,000 students on a big campu

3、s in an unfamiliar city?StudentThats an understatement. I just cant get comfortable in class or in the dorms. You know, socially.CounselorUmwell, lets start with the academics. Tell me about you classes.StudentIm taking mostly introductory courses and some are taught in these huge lecture halls.Coun

4、selorAnd you are having trouble in keeping pace with the material? StudentNo, in fact I got an A on my first economics paper. Its just that, its so impersonal, Im not used to it.CounselorAre your classes impersonal?StudentNo, its just thatfor example, in sociology yesterday, the professor asked a qu

5、estion, so I raised my hand, several of us raised our hands. And I kept my hand up because I did the reading and knew the answer. But the professor just answered his own question and continued with the lecture.CounselorWell, in a big room its possible he didnt notice you. Maybe he was starting to sa

6、ve time. In either case I wouldnt take it personally.StudentI suppose. But I just dont know how to, you know, distinguish myself.CounselorWhy not stop by his office during office hours?StudentThat wouldnt seem right. You know, taking time from other students who need help?CounselorDont say that. Tha

7、ts what office hours are for. There is no reason you couldnt pop in to say hi and to make yourself known. If you are learning a lot in class, let the professor know. Wouldnt you appreciate positive feedback if you were a professor?StudentYou are right. Thats a good idea. CounselorOK, erlets turn to

8、your social life. Hows it going in the dorms?StudentI dont have much in common with my roommate or anyone else Ive met so far. Everyones into sports and Im more artsy, you know, into music. I play the cello.CounselorHah, have you been playing long?StudentSince age ten. Its a big part of my life. At

9、home I was the youngest member of our community orchestra.CounselorYou are not going to believe this. There is a string quartet on campus, all students. And it so happened that the cellist graduated last year. Theyve been searching high and low for a replacement, someone with experience. Would you b

10、e interested in auditioning?StudentAbsolutely. I wanted to get my academic work settled before pursuing my music here. But I think this would be a good thing for me. I guess if I really want to fit in here I should find people who love music as much as I do. Thank you.CounselorMy pleasure.Lecture 1

11、SociologyNarrator Listen to part of a lecture in a sociology class.Professor:Have you ever heard the one about alligators living in New York sewers? The story goes like this: a family went on vacation in Florida and bought a couple of baby alligators as presents for their children, then returned fro

12、m vacation to New York, bringing the alligators home with them as pets. But the alligators would escape and find their way into the New York sewer system where they started reproducing, grew to huge sizes and now strike fear into sewer workers. Have you heard this story? Well, it isnt true and it ne

13、ver happened. But despite that, the story has been around since the 1930s. Or how about the song twinkle, twinkle little star, you know, twinkle, twinkle, little star, how I wonder what you are. Well weve all heard this song. Where am I going with this? Well, both the song and the story are examples

14、 of memes. And thats what we would talk about, the theory of memes. A meme is defined as a piece of information copied from person to person. By this definition, most of what you know, ideas, skills, stories, songs are memes. All the words you know, all the scientific theories youve learned, the rul

15、es your parents taught you to observe, all are memes that have been passed on from person to person. So what? You may say. Passing on ideas from one person to another is nothing new. Well, the whole point of defining this familiar process as transmission of memes is so that we can explore its analog

16、y with the transmission of genes. As you know, all living organisms pass on biological information through the genes. Whats a gene? A gene is a piece of biological information that gets copied or replicated, and the copy or replica is passed on to the new generation. So genes are defined as replicat

17、ors. Genes are replicators that pass on information about properties and characteristics of organisms. By analogy, memes also get replicated and in the process pass on culture information from person to person, generation to generation. So memes are also replicators. To be a successful replicator, t

18、here are three key characteristics: longevity, fecundity and fidelity. Lets take a closer look. First, longevity. A replicator must exist long enough to be able to get copied, and transfer its information. Clearly, the longer a replicator survives, the better its chances of getting its message copie

19、d and passed on. So longevity is a key characteristic of a replicator. If you take the alligator story, it can exist for a long time in individual memory, lets say, my memory. I can tell you the story now or ten years from now, the same with the twinkle, twinkle song. So these memes have longevity b

20、ecause they are memorable for one reason or another. Next, fecundity. Fecundity is the ability to reproduce in large numbers. For example, the common housefly reproduces by laying several thousand eggs, so each fly gene gets copied thousands of times. Memes, well, they can be reproduced in large num

21、bers as well. How many times have you sung the twinkle, twinkle song to someone? Each time you replicated that song, and maybe passed it along to someone who did not know it yet, a small child maybe. And finally, fidelity. Fidelity means accuracy of the copying process. We know fidelity is an essent

22、ial principle of genetic transmission. If a copy of a gene is a bit different from the original, thats called a genetic mutation. And mutations are usually bad news. An organism often can not survive with a mutated gene. And so a gene usually can not be passed on, unless its an exact copy. For memes

23、 however, fidelity is not always so important. For example, if you tell someone the alligator story I told you today, it probably wont be word for word exactly as I said it. Still, it will be basically the same story, and the person who hears the story will be able to pass it along. Other memes are

24、replicated with higher fidelity though, like the twinkle, twinkle song. It had the exact same words 20 years ago as it does now. Well, thats because we see songs as something that has to be performed accurately each time. If you change a word, the others will usually bring you in line. Theyll say, t

25、hats not how you sing it, right? So, you can see how looking at pieces of cultural information as replicators, as memes, and analyzing them in terms of longevity, fecundity and fidelity, we can gain some inside about how they spread, persist or change Lecture 2 AstronomyNarratorListen to part of a l

26、ecture in an Astronomy ClassProfessor:Last week, we covered some arguments against going back to the Moon. But there are compelling reasons in favor of another Moon landing too, um not the least of which is trying to pinpoint the moons age. We could do this in theory by studying an enormous impact c

27、rater, known as the South Pole-Aitken Basin. Umits located in the moons South Polar Region. But, since its on the far side of the moon, it can only be seen from space. Here is an image ofwell call it the SPA Basin. This color-coated image of the SPA Basin, those arent its actual colors obviously, th

28、is image is from the mid 90s, from the American spacecraft called Clementine. Um unlike earlier lunar missions, Clementine didnt orbit only around the moons equator. Its orbits enable it to send back data to create this topographical map of well, the grey and white area towards the bottom is the Sou

29、th Pole, the purples and blues in the middle correspond to low elevations - the SPA Basin itself, the oranges and reds around it are higher elevations. The basin measures an amazing 2,500 km in diameter, and its average depth is 12 km. That makes it the biggest known crater in our solar system and i

30、t may well be the oldest. You know planetary researchers love studying deep craters until learn about the impacts that created them, how they redistributed pieces of a planets crust and in this case, we especially want to know if any of the mantle, the layer beneath the crust, was exposed by the imp

31、act. Not everyone agrees, but some experts are convinced that whatever created the SPA Basin did penetrate the Moons mantle. And we need to find out, because much more than the crust, the mantle contains information about a planets or Moons total composition. And thats key to understanding planet fo

32、rmation. Um Dian? Dian: So, the only way to know the basins age is to study its rocks directly? Professor: well, from radio survey data, we know that the basin contains lots of smaller craters. So it must be really old, about 4 billion years, give or take a few hundred million years. But thats not v

33、ery precise. If we had rock samples to study, wed know whether the small craters were formed by impacts during the final stages of planetary formation, or if they resulted from later meteor showers. Dian: But if we know around how old the Basin is, Im not sure thats reason enough to go to the Moon a

34、gain. Professor: No, but such crude estimatesumwe can do better than that. Besides, there are other things worth investigating, like is there water ice on the moon? Clementines data indicated that the wall of the south-polar crater was more reflective than expected. So some experts think theres prob

35、ably ice there. Also, data from a later mission indicates significant concentrations of hydrogen and by inference water less than a meter underground at both poles. Student: Well if theres water, how did it get there? Underground rivers? Professor: We think meteors that crashed into the moon or tail

36、s of passing comets may have introduced water molecules. Any water molecules that found their way to the floors of craters near the moons poles, that water would be perpetually frozen, because the floors of those craters are always in shadow. Umfurthermore, if the water ice was mixed in with rock an

37、d dust, it would be protected from evaporation. Dian: So are you saying there might be primitive life on the moon? Professor: thats not my point at all. Um o.k., say there is water ice on the moon. That would be a very practical value for a future moon base forastronauts. Water ice could be melted a

38、nd purified for drinking. It could also be broken down into its component parts - oxygen and hydrogen. Oxygen could be used to breathe, and hydrogen could be turned into fuel, rocket fuel. So water ice could enable the creation of a self-sustaining moon base someday, a mining camp perhaps or a depar

39、ture point for further space exploration. Student: But holding tons of equipment to the moon to make fuel and build a life support system for a moon base, wouldnt that be too expensive? Professor: Permanent base, maybe a ways off, but we shouldnt have to wait for that. The dust at the bottom of the

40、SPA Basin really does have a fascinating story to tell. I wouldnt give for a few samples of it.Conversation 2 NarratorListen to a conversation between a student and a professor.StudentHi, I was wondering if I could talk with you about the assignment in the film theory class.ProfessorOf course, Jill.

41、StudentIt seems that pretty much everyone else in the class gets what they are supposed to be doing but Im not so sure.ProfessorWell, the class is for students who are really serious about film. You must have taken film courses before.StudentYeah, in high school, film appreciation.Professor UmI woul

42、dnt think that would be enough. Did you concentrate mainly on form or content?StudentOh, definitely content. Wed watch, say Lord of the Flies, and then discuss it.ProfessorOh, that approach, treating film as literature, ignoring what makes it unique.StudentI liked it, though.ProfessorSure, but that

43、kind of class. Well, Im not surprised that you are feeling a little lost. You know, we have two introductory courses that are supposed to be taken before you get to my course, one in film art, techniques, technical stuff and another in film history. So students in the class you are in should be pret

44、ty far along in film studies. In fact, usually the system blocks anyone trying to sign up for the class they shouldnt be taking. And who hasnt taken the courses you are required to do first as prerequisites.StudentWell, I did have a problem with that but I discussed it with one of your office staff,

45、 and she gave me permission.ProfessorOf course. No matter how many times I tell them, they just keep on Well, for your own good, I really suggest dropping back and starting at the usual place.StudentYes. But Ive already been in this class for 4 weeks. Id hate to just drop it now especially since I f

46、ind it so different, so interesting.ProfessorI guess so. Frankly I cant believe youve lasted this long. These are pretty in-depth theories weve been discussing and youve been doing OK so far, I guess. But still, the programs been designed to progress through certain stages. Like any other profession

47、al training we build on pervious knowledge.StudentThen maybe you could recommend some extra reading I can do to catch up?ProfessorWell, are you intending to study film as your main concentration?StudentNo, no. I am just interested. Im actually in marketing, but there seems to be a connection.Profess

48、orOhwell, inin that case, if youre taking the course just out of interest, I mean I still highly recommend signing up for the introductory courses at some point, but in the meantime, there is no harm I guess in trying to keep up with this class. The interest is clearly there. Eh, instead of any extr

49、a reading just now though, you could view some of the old introductory lectures. We have them on video. That would give you a better handle on the subject. Its still a pretty tall order, and we will be moving right along, so you will really need to stay on top of it.StudentOK, Ive been warned. Now,

50、could I tell you about the idea for the assignment?Lecture 3 ChemistryNarratorListen to part of a lecture in a chemistry class. ProfessorOkay. I know you all have a lot of questions about this lab assignment thats coming out so . Im gonna take a little time this morning to discuss it.So, you know th

51、e assignment has to do with Spectroscopy, right? And your reading should help you get a good idea of what thats all about. But, lets talk about Spectroscopy a little now just to cover the basics. What is Spectroscopy? Well, the simplest definition I can give you is that Spectroscopy is the study of

52、the interaction between matter and light. Now, visible light consists of different colors or wavelengths, which together make up whats called spectrum, a band of colors, like you see in a rainbow. And all substances, all forms of matter, can be distinguished according to what wavelength of light the

53、y absorb and which ones they reflect. Its like, um, well, every element has, what we call, its own spectral signature. If we can read that signature, we can identify the element. And thats exactly what spectroscopy does.Now, Laser Spectroscopy, which is the focus of your assignment, works by measuri

54、ng very precisely what parts of the spectrum are absorbed by different substances. And it has applications in a lot of different disciplines. And your assignment will be to choose a discipline that interests you, and devise an experiment. For example, Im gonna talk about art. Im interested in the ar

55、t and to me its interesting how spectroscopy is used to analyze art. Er. lets say a museum curator comes to you with a problem. Shes come across this painting that appears to be an original - lets say, a Rembrandt. And she wants to acquire it for her museum. But shes got a problem: shes not absolute

56、ly certain its an original. So, what do you do? How do you determine whether the paintings authentic? Okay. Think about the scientific process. Youve got the question: Is the painting a Rembrandt? So first, youll need to make a list of characteristics the painting would have to have to be a Rembrand

57、t. Then you have to discover whether the painting in question has those characteristics. So first of all, youll need to know the techniques Rembrandt used when he applied paint to canvas - his brushstrokes, how thickly he applied his paint. So youd need to work with an art historian who has expert k

58、nowledge of Rembrandts style. Youd have to know when he created his paintings, um. what pigments he used, in other words, what ingredients he used to make different colors of paint, cost the ingredients used in paints and binding agents plus varnishes, finishes, what have you, have changed over time

59、. Since youre trying to verify thats a Rembrandt, the ingredients in the pigment would need to have been used during Rembrandts lifetime - in the 17th century. And thats where chemistry comes in. Youve got to find out whats in those pigments, learn their composition, and that requires lab work detec

60、tive work really - in a word, Spectroscopy. So, how do we use Spectroscopy? Well, we put an infrared microscope a spectroscope - on tiny tiny bits of paint. And using ultraviolet light we can see the spectral signature of each component part of the pigment. Then we compare these signatures with thos

61、e of particular elements like zinc or lead, to determine what the pigment was made of. So, you can see why this type of analysis requires a knowledge of the history of pigments, right? How and when they were made? Say we determined a pigment was made with zinc, for example. We know the spectral sign

62、ature of zinc. And it matches that of the paint sample. We also know that zinc wasnt discovered until the 18th century. And since Rembrandt lived during the 17th century, we know he couldnt have painted it. Now, Spectroscopy has a very distinct advantage over previous methods of analyzing our works,

63、 because its not invasive. You dont have to remove big chips of paint to do your analysis, which is what other methods require. All you do is train the microscope on tiny flecks of paint and analyze them. Now a word or two about restoration. Sometimes original art works appear questionable or inauth

64、entic because theyve had so many restorers add touchup layers to cover up damage, damage from the paint having deteriorated over time. Well, spectroscopy can review the composition of those touchup layers too. So we can find out when they were applied. Then if we want to undo some bad restoration attempts, we can determine what kind of process we can use to remove them to dissolve the paint and uncover the original. Lecture 4 LiteratureNarratorListen to part of a lecture in a literature class.ProfessorNow we cant really talk about fairy tales without first talking