题目内容
Coming soon to your TV: views of the hottest live basketabll plays from any seat in the stadium. What a better look at that three-point shot？ Call for a replay from behind the basket. Or better yet, follow the "view" of the ball as it goes through the net.
While watching, you might use a built-in speakerphone to talk with a fan in the stands. Sounds impossible？ It won' be when the television industries combine to create digital TV—machines that receive, send, store and manipulate TV programs the way computers now manipulate other data.
Industry and government representatives recently reached an agreement on how this technology will take place. New digital TVs that allow current TVs to receive digital signals may hit store shelves by next spring.
To understand how the digital revolution will change the way you watch TV, it helps to know how TVs work now. Today, TV networks such as CBS and Fox broadcast TV show as analog electrical signals. These signals travel via the airwaves, satellites, or cable as a continuous stream of electromagnetic energy (like light and radio waves). But this system leaves a lot of room for error. The main problem is that interference can change the voltage of the signal as it travels. This may result in a distorted of miscolored picture. If we send out the signal in a form. that is nearly free from interference -- binary code, pictures and colors are not distorted.
You will need to buy a new TV to receive these signals. And the new sets may cost 1, 000 US dollars more than today's TVs. But they will come with other benefits that may make the price worthwhile. For one thing, the screens will be wider, like movie screens. In addition, the color will be richer. And you will also get digital CD-quality sound.
Besides these benefits, digital TVs can offer you much wider choice of programs. Digital data can expand TV choices because computers can compress digital signals. Broadcasters will be able to send out six times as much as information on the same "channel".
The following qualities are mentioned in the passage EXCEPT ______？
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As every traveler soon finds out, it is important to know the local time.【C1】______until the last century, every town and village kept its own time, usually regulated【C2】______an official public clock set in the town hall or village church.【C3】______the sun was directly overhead, the clock【C4】______strike noon. This meant that the time was【C5】______for each degree of longitude(经度). Saudi Arabia and a few Pacific islands still keep this "sun time".【C6】______of the world, however, operates according to time zones【C7】______by international agreement. The globe is divided【C8】______24 time zones, one for each hour of the day. Mean time is the time at the Prime Meridian(本初子午线). All the【C9】______zones are measured according to【C10】______time or minus time, reflecting the differences【C11】______the particular time zone and Greenwich mean time. The International Date Line,【C12】______one day changes to the next, is at【C13】______near the 180th meridian.
The boundaries between time zones are usually meridians.【C14】______on some maps they appear to be straight lines, they are【C15】______great circles. In many places,【C16】______, the time-zone boundaries have been【C17】______to accommodate national boundaries and other political or economic divisions.
Most nations prefer to have【C18】______of their territory in the same time zone. Those【C19】______very large areas, however, need to【C20】______themselves into two or more zones.
【C1】
听力原文：M: Hey, Karen. Look like you got some sun this weekend.
W: Yeah. I guess so. I spent the weekend at the beach.
M: Oh, yeah. That's great. Where did you stay？
W: Some friends of my parents live out there, and they invited me for as long as I wanted to stay.
M: So what are you doing back here？
W: Oh, I have a paper I need to work on. And I just couldn't do any serious studying at the beach.
M: I don't blame you. So what did you do out there？ I mean besides lie out in the sun, obviously.
W: I jogged up and down the beach and I played some volleyball. You know I never realized how hard it is to run on sand. I couldn't get through a whole game before I had to sit down. It's much easier to run on wet sand near the water.
M: Not to mention cooler. Did you go swimming？
W: I wanted to. But they said the water isn't warm enough for that until a couple of months from now. So I just waded in up to my knees.
M: It all sound's so relaxing. I wish I could get away to the beach like that.
W: It looks like you could use it. Don't tell me you spent the weekend in the library again.
How did the woman spend last weekend？
According to the conversation, where does thunder occur？
听力原文：W: Wake up, Erik, time to rise and shine.
M: Ha , oh, hi , Jane, I must have fallen asleep while I was reading.
W: You and everyone else. It looks more like a camp ground than a library.
M: Well, the dorm's too noisy to study in, and I guess this place is too quiet.
W: Have you had any luck finding a topic for your paper？
M: No, Prof. Grant told us to write about anything in cultural anthropology. For once I wish she had not given us so much of a choice.
W: Well, why not write about the ancient civilizations of Mexico. You seem to be interested in that part of the world.
M: I am, but there is too much material to cover. I'll be writing forever, and Grant only wants five to seven pages.
W: So then limit it to one region of Mexico, . say the Uka town. You've been there and you said it's got lots of interesting relics.
M : That's not a bad idea. I brought many books and things back with me last summer that would be great resource material, now if I can only remember where I put them.
Why has the woman come to talk to the man？
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