gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêPart A
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê1. A: I need to go across town, but the traffic is so heavy this time of day.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: When you take the subway, you don’t have to deal with traffic. I never drive any more.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the man imply?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê2. A: I’ve got two tickets to today’s game. Do you want to come along?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: It’ll be on television. Besides, it’s really too cold for me.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat will the man probably do?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê3. A: You had met Professor Johnson before, right? How would you describe his lectures?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: Well, let me put it this way: I could never stay awake in one of his classes without first
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêdrinking at least two cups of coffee.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the man imply?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê4. A: Excuse me, could you tell me how to get to the post office?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: Your guess is as good as mine. I’m new around here.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the woman mean?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê5. A: I forgot to tell you that Fred called last night to borrow your sleeping bag.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: Oh, I saw him at the gym this morning and he didn’t say anything. So he must’ve
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêasked somebody else.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the man imply?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê6. A: You must be looking forward to your trip back to Colorado. It should be fun to hike up
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêinto those mountains again.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: Well, there might not be time for that. The thing is I haven’t seen my sister and her
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêkids for three years.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the woman imply?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê7. A: Tom’s house is a mess! Doesn’t he ever clean it?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: I guess he just has too much else on his mind with that new job of his.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the woman imply about Tom?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê8. A: Hey, that’s a great sweater you’re wearing. It looks really warm.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: Yeah, but I wish I brought a coat like you did. It’s really cold today.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the woman imply?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê9. A: Hey, George, I can’t get to sleep with the lights so near my bed. Can you study
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêsomeplace else?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: Sorry, there is a party going on down in the lounge. I suppose I can check the dining
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêroom though.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat will George probably do?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê10. A: I wish I didn’t have to make a special trip to the post office to get my package.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: Well, if you call them in the morning, they’ll give the package to your mail carrier to
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêbring out to you.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the woman suggest the man do?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê11. A: Professor, have you graded my term paper yet?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: To tell you the truth, I’ve been tied up in committee meetings all week.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat can be inferred about the paper?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê12. A: With the cold that bad, I think it is pretty foolish not to see a doctor.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: Don’t worry. It’ll pass in a few days.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the man mean?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê13. A: Do you have hot water in your dorm? Because we haven’t had any for three days and
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêI hate cold showers.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: Oh, sounds miserable. Since the gyms usually open, why don’t you just go over there
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêto fix the problem?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the woman suggest the man do?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê14. A: I just found out the registration of the creative writing class is full. Now I have to wait
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêanother whole year to get in.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: Why don’t you check back after the first week? Somebody might drop it.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the man suggest the woman do?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê15. A: Professor Nelson, could you please turn up the temperature in here? I’m having
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêtrouble concentrating.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: Yeah, I understand, but I don’t control the thermostat. Tell you what, I’ll talk to
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêmaintenance about it after class. In the mean time, I suggest you put on a sweater if you
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêbrought one.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the man imply?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê16. A: Hi, Jerry, it’s Beth from the apartment next door. I’m at school right now and I realize I
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêforgot my keys at home. Could you ask the building manager to put the extra set in my
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêmailbox?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: I don’t think that’s secure enough. I can just drop by your class later.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat would the man probably do?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê17. A: I’m going to Chicagoon business and somebody said you were the right person to talk
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêto about what I can do there for fun.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: You bet I am. But I hope you’ve got at least a month.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the man imply?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê18. A: Come on, Sue, I know you have a new camera, but, you just took a picture of a car.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: No, No! Look behind the car.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the woman mean?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê19. A: Could I look at your bus schedule? I don’t want to drive to work tomorrow if it’s snowing.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: You would be better off calling the terminal. It’s been a long time since I’ve used my schedule and I’m sure it was out of date.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the woman mean?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê20. A: That’s a pretty thick book. Are you sure Fram will want to plough through that?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: Are you kidding? She’ll be through it in two days.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the man imply about Fram?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê21. A: If I send this package third class, how long will it take to arrive?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: About two weeks. But, hmm, many people don’t realize that first class is only a dollar fifty more and it would get there in just a few days.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the woman suggest the man do?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê22. A: Surely, you don’t want to eat at the expensive restaurant.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: Not much I don’t. They have the best food in town.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the man mean?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê23. A: Like usual the lecture hall is complete mess this afternoon. Newspapers, soda cans, used issues, all of it, just thrown all over the floor. I can’t understand how people can be so thoughtless.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: Well, your professor should have the authority to get something done about it.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the woman imply the man should do?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê24. A: How about going on a camping trip next week with us? We are planning on hiking and canoeing in the state park.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: That sounds great. But I’d better warn you: I’ve never been in the canoe and I am not much the swimmer either.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the woman mean?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê25. A: I heard that the pre-turn-out for the opening of the new sculpture exhibit was a kind of disappointing.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: I guess a lot of other people feel the way I do about modern art.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the woman mean?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê26. A: We’d better make sure we get to the presentation early tomorrow morning. The dean said that there would be bagels and pastries in food. But I have a feeling that they are going to go quickly.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: I guess I’ll bring my appetite.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat will the man probably do?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê27. A: Isn’t it great about Ruth’s community service award?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: She deserved it
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the man mean?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê28. A: I’m driving downtown this afternoon. I have to stop by Deluxe, the art supply store, to get some paints for my art class.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: Deluxe? They moved to Smithville.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the woman mean?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê29. A: You were right about the puzzle you lent me last week. It really is a challenge. I want
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêto try to get it myself though, so I am going to work on it a little longer.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: Well, if you get really stuck, remember, I’m only a phone call away.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the woman mean?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê30. A: I’m new in town and I need to find a doctor. Do you know anything about Joyce Brown?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêB: I’ve been going to her for years. I don’t see how you could do better.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWhat does the man say about Dr. Brown?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêgñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêPart B
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêQuestions 31-34 Listen to a conversation in a college dormitory.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêHmm, hi.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêHi, I am going door to door tonight to tell people about the student action coalition. Do you have a few minutes?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêSure. You know, I think I read something in the newspaper last week.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêYeah, there was an article about us since the last issue. See, we are trying to protect and conserver some of the open spaces on campus.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêThat’s right. You are the group that’s opposing the extension of the parking lot next to
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêSmith Hall, right?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêThat’s us. We just feel it is important to save some of the natural beauty of the campus,
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêlike Over-by Swing. Some of those trees are hundreds of years old.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêIt is a pretty spot. My friends and I had picnics over there by the creek.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêThen you understand how we feel. We are organizing a rally on Thursday afternoon to get the administration to reconsider the parking lot plan.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêWell, I have a class on Thursday afternoon.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêBut maybe you could sign this petition. We’re going to summit it to the administration to demonstrate how the students feel about this.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêSure, let me get a pen and I’ll sign it.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêI have a pen right here. And let me leave you this pamphlet about the student action coalition. Maybe you could come to some of our meetings. We get together once a month.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêYeah, I’d like to know more about your group. Let me know when the next meeting is and
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêI’ll try to be there.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê31. How did the woman first learn about the student action coalition?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê32. What is the student action coalition trying to do?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê33. What will the woman probably do on Thursday afternoon?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê34. What does the woman agree to do?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê Q 35-39
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêThis food is terrible! I can’t even finish my diner.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêI know. You think with all the money we paid for room and board, the university could hire
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêa better food service. Where are you headed next?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêI’m going over to the student recreation center to play some bridge.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêYou are spending your time on a card game?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêNot just any card game. It’s one of the most strategic there is.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêSo I have heard. Don’t you play with a partner?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêYeah! Four people play, two against the other two.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêSo, you try to play in cooperation with your partner?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêActually, the cards of one of the four plays are turned face up. That player is called the
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêdummy.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêI wouldn’t want to be called that. When you are the dummy, what do you do while the
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêcards are being played?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêAnything you want. Sit there and study, shuffle another deck, get snacks for
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêeveryone… I like to stand behind my partner and watch.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêYou know, I’ve heard that bridge is a habit forming. You should be careful not to play so
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêmuch that you don’t get your studying done.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêDon’t worry about me. I only play Thursdays after dinner, and sometimes when they
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêneed a forth player. If you like, I could teach you.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêThanks, but I have a pretty heavy workload this semester. I already spend my evenings
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêdoing things I don’t really know how to do yet.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê35. Where does the conversation take place?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê36. How does the woman plan to spend her evening?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê37. What will the woman probably do if she is the dummy?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê38. What does the man warn the woman not to do?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê39. Why doesn’t the man accept the woman’s offer?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêPart C
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêQuestions 40-42 Listen to part of a talk in an architecture class.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêToday, we are going to take a look at the development of the skyscraper. We’ll start with some buildings in Chicago. One of the circumstances that led Chicago to become home to some of the buildings now considered the prototypes for later skyscrapers was this: In 1871, there was a great fire that destroyed much of the city. It was that tragic fire that cleared the way for a new kind of city that used the new building techniques and new materials developed during the early 1800s.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêOne of these new structures was the Home Insurance Building, completed in 1885. It was ten storeys high. Now granted, that’s no higher than some of the early skyscrapers in New York City. What made Chicago’s Home Insurance Building important is that it had true skyscraper instruction with an internal metal skeleton that carried the weight of the brick exterior. This metal-support system along with the earlier development of the elevator were the two innovations that made the later very tall industrial buildings possible.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêChicago’s RelianceBuilding was another important building in the development of the skyscraper. It showed the architects’ understanding of the possibilities of mental frame construction by eliminating walls and opening up the sides as a glass box. It was the first expression of the skyscraper as the glass shelf framed in the metal grid.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê40. Why does the professor mention the fire of 1871?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê41. What was important about the Home Insurance Building?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê42. What point does the professor make about the Reliance Building?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêQuestions 43-46 Listen to a lecture given in a mass communications class.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêIt was an Italian inventor who created the first wireless device for setting out radio signals
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêin 1895. But not until the American inventor Lee De Forest built the first amplifying vacuum
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêtube in 1906 did we get the first radio as we know it. And the first actual radio broadcast was
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêmade on Christmas Eve of 1906. That’s when someone working from an experimental
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêstation in Brand Rock, Massachusetts, arranged the program with two short musical
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêselections of poem and brief holiday greeting. The broadcast was heard by wireless
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêoperators on ships with a radio through several hundreds miles. The following year, De
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêForest began regular radio broadcasts in New York. These programs were similar to much
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêwhat we hear on radio today. In that, De Forest played only music. But because there were
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêstill no home radio receivers, De Forest’s audiences consisted only of wireless operators on
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêships in New York Harbor. There is no doubt that radio broadcasting was quite a novelty in
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêthose days, but it took a while to catch on commercially. Why? Hmm, for the simple fact
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêthat only a few people, in fact, only those who tinkered with wireless telegraphs as a hobby
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêowned receivers. It wasn’t until the 1920s that someone envisioned mass appeal for radio.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêThis was radio pioneer David Sarnoff who predicted that one day there would be a radio
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêreceiver in every home.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê43. What is the talk mainly about?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê44. Why were early radio broadcasts heard by such a small audience?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê45. According to the talk, who owned the receivers in the early days of radio?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê46. According to the talk, what did David Sarnoff predict about radios?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêQuestions 47-50 Listen to part of a talk in an astronomy class
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêThe origin of Earth’s moon, the largest moon in the solar system, is still something of a
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêmystery. There are some theories about its origin however. Now, keep in mind that a theory
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêof the moon’s origin has to be consistent with two important facts. The first fact is that the
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêEarth contains a lot of iron, most of it has an iron core. But the moon contains practically no
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêiron. The second fact is that other than the difference in iron content, the moon and Earth are
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêcomposed of accentually the same minerals, a similarity not shared with any other planet or
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêmoon in our solar system.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêOne of the earliest theories of the moon’s origin, I called it the Capture Theory, proposes that the moon was somehow captured by Earth’s gravitational force. This theory is improbable, however, because it assumes that the moon and Earth formed in different parts of the solar system. If this was true you would expect the moon’s composition to be much different from Earth’s composition, just as all the other planets in the solar system are so different from Earth.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òêA second theory of the moon’s origin is more promising. It is sometimes referred to as the Mars Theory, because according to this theory, when Earth was still molten, it was struck by a planet about the size of Mars. The impact caused the cores of the two planets to melt together and chunks of Earth’s crust to be thrown out into space. These chunks came together to form the moon. Now, remember, Earth’s crust is low in iron, because the iron is in Earth’s core, but high in various other minerals. This then accounts for why there is little iron but lots of other minerals on the moon.
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê47. What is the talk mainly about?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê48. According to the professor, what characteristic of Earth’s moon should a theory of its origin be able to explain?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê49. Why is the second theory sometimes referred to as the Mars Theory?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê50. According to the Mars Theory, why does the moon contain little iron?
gñ`Ë/Y%#îforum.liuxuehome.comõ¹ òê