2020年专四专八考试的区别

SECTION C NEWS BROADCAST

Directions: In this section you will hear everything ONCE ONLY. Listen carefully and then answer the questions that follow. At the end of each news item, you will be given 10 seconds to answer the questions.

听力原文： The cancellation of the 16-day flight means that the crew and scientists on the ground are pursuing only their most important experiments in the few remaining hours left before the shuttle laboratory is closed. The US sapce agency NASA decided Sunday to bring the orbiter home 12 days early because of fears of weakened power generator could explode. The generator has been turned off, leaving the shuttle with only two thirds of its normal power supply. To conserve electricity for the experiments the crew is working in dimmer lighting than normal and has turned off all unessential equipment. NASA says the two remaining generators are sufficient for Tuesday's landing, but had nevertheless ordered the astronauts to study emergency procedures in case another fails. The shuttle team has expressed its disappointment at the curtailment of the science mission, and says enough data have already been collected in the materials, combustion and biological experiments to push science further ahead. The scientist' goal is to complete the experiments on a later shuttle flight. David Batlery, VOA news, Washington.

Why did NASA decide to bring the shuttle home earlier?

A．The laboratory was closed.

B．The generator was turned off.

C．The power generator might explode.

D．Electricity was going to run out.

SECTION B INTERVIEW

Directions: In this section you will hear everything ONCE ONLY. Listen carefully and then answer the questions that follow. Questions 1 to 5 are based on an interview. At the end of the interview you will be given 10 seconds to answer each of the following five questions.

Now listen to the interview.

听力原文：Interviewer: Well Charles, I must say that your shop is pretty remarkable. Um, it's basically a sweetshop, but you also do stationery and greeting cards and tobacco and fireworks

Shopkeeper: And newspapers.

Interviewer: And newspapers. Ah. And apart from all that, you've got photocopiers...

Shopkeeper: That's right.

Interviewer: And a fax machine.

Shopkeeper: Indeed.

Interviewer: Yes. How did. I mean, why the photocopiers?

Shopkeeper: Everything that's happened in my shop has almost happened by accident. But when I got into Clifton, I needed a photocopy one day and no one could tell me where to go. So it struck me that if I didn't know where to go, other people were in the same situation, so that's why I started it. And then I added on a facsimile machine because it seemed like a natural progression at the time. And all sorts of people use it.

Interviewer: Yes, who, what sort of people do use it?

Shopkeeper: Um, a lot of professional people —surveyors, engineers — particularly people who need to send plans. Because in the past you could send messages via telex, but a telex can't express a plan, whereas facsimile has that dimension, the added dimension.

Interviewer: Right. And do people send these fax messages abroad, or is it just to this country?

Shopkeeper: Well, it's surprising because when I started, I thought I'd be sending things to London and maybe Birmingham but, in fact, a high percentage of it is sent abroad, because it's immediate, it's very speedy. You can send a message and get an answer back very quickly.

Interviewer: And how much would it cost, for example, if I wanted to send a fax to the United States?

Shopkeeper: Well, a fax to the United States would cost you five pounds for a page. And when you think that in England by the Royal Mail, it would cost you twelve pounds to send a page by special delivery, it's actually a good value.

Interviewer: OK. What about your hours? How long do you have to spend actually in the shop?

Shopkeeper: Well, the shop is open from, essentially from eight in the morning until six at night, six days a week, and then a sort of fairly flexible morning on a Sunday. Um, and of those hours, I'm in it quite a lot.

Interviewer: And how long have you actually had the shop?

Shopkeeper: I started to have my shop in 1982, the 22nd of December, oh, sorry, the 22nd of November. It sticks in my brain.

Interviewer: And did you enjoy it?

Shopkeeper: Yes, overall I enjoy it. Running a business by yourself is jolly hard work and you never quite like every aspect all the time. 95% of the customers I love. Uh, 2% I really, you know, I'm not too bothered about. And 3% I positively hate.

Interviewer: What, What's the problem with those? Are they people who stay around and talk to you when you're busy or complain or what?

Shopkeeper: Um, it's bard to categorize really. I find people who are just totally rude, urn, unnecessary, and I don't really need their custom. And I suppose they form. the volume of the people that I don't like. But it's a very, very, very small percentage.

Interviewer: But is there a danger that shops like yours will disappear, more and more?

Shopkeeper" I think there's a very, very great danger that the majority of them will disappear.

Interviewer: Why's that?

Shopkeeper: Simply because costs of running a shop have just become very, very high. To give you some example, in the time that I've been there, my rent has quadrupled, the local property tax have doubled, other costs have gone up proportionately. And at the end of the day it is a little bit hard to try to keep u

A．cigarettes

B．exercise books

C．photocopiers

D．chocolates

Telecommunications stand for devices and systems that transmit electronic or optical signals across long distances. Telecommunications enables people around the world to contact one another, to access information instantly, and to communicate from remote areas. Telecommunications usually involves a sender of information and one or more recipients linked by a technology, such as a telephone system, that transmits information from one place to another. Telecommunications enables people to sand and receive personal messages across town, between countries, and to and from outer space. It also provides the key medium for delivering news, data, information, and entertainment.

Telecommunications devices convert different types of information, such as sound and video, into electronic or optical signals. Electronic signals typically travel along a medium such as copper wire or are carried over the air as radio waves. Optical signals typically travel along a medium such as strands of glass fibers. When a signal reaches its destination, the device on the receiving end converts the signal back into an understandable message, such as sound over a telephone, moving images on a television, or words and pictures on a computer screen.

Telecommunications messages can be sent in a variety of ways and by a wide range of devices. The messages can be seat from one sender to a single receiver (point-to-point) or from one sender to many receivers (point-to-multipoint). Personal communications, such as a telephone conversation between two people or a facsimile (fax) message (see Facsimile Transmission), usually involve point-to-point transmission. Point-to-multipoint telecommunications, often called broadcasts, provide the basis for commercial radio and television programming.

Telecommunications begin with messages that are converted into electronic or optical signals. Some signals, such as those that carry voice or music, are created in an analog or wave format, but may be converted into a digital or mathematical format for faster and more efficient transmission. The signals are then sent over a medium to a receiver, where they are decoded back into a form. that the person receiving the message can understand. There are a variety of ways to create and decode signals, and many different ways to transmit signals.

Individual people, businesses, and governments use many different types of telecommunications systems. Some systems, such as the telephone system, use a network of cables, wires, and switching stations for point-to-point communication. Other systems, such as radio and television, broadcast radio signals over the air that can be received by anyone who has a device to receive them. Some systems make use of several types of media to complete a transmission. For example, a telephone call may travel by means of copper wire, fiber-optic cable, and radio waves as the call is sent from sender to receiver. All telecommunications systems are constantly evolving as telecommunications technology improves. Many recent improvements, for example, offer high-speed broadband connections that are needed to send multimedia information over the Internet.

Personal computers have pushed the limits of the telephone system as more and more complex computer messages are being sent over telephone lines, and at rapidly increasing speeds. This need for speed has encouraged the development of digital transmission technology. The growing use of personal computers for telecommunications has increased the need for innovations in fiber-optic technology.

Telecommunications and information technologies are merging and converging. This means that many of the devices now associated with only one function may evolve into more versatile equipment. This convergence is already happening in various fields. Some telephones and pagers are able to store not only phone numbers but also names and personal information abo

A．Current development.

B．Transmission of message.

C．Computer networking.

D．Government regulation.