大学英语四级100及答案解析.doc

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1、大学英语四级 100 及答案解析(总分：746.58，做题时间：130 分钟)一、Writing (30 minutes)(总题数：1，分数：30.00)1.For this part, you are allowed 30 minutes to write an e-mail to change the time of an appointment. You should write at least 120 words following the outline given below in Chinese: 1. 给你的朋友 Frank 发一封 e-mail,告诉他由于明天你要参加一场考

2、试，无法按预定计划和他见面； 2. 对此带来的不便表示抱歉； 3. 重新约定见面时间。 （分数：30.00）_二、Reading Comprehensio(总题数：1，分数：71.00)Mobile phones What Are Mobile Phones? A mobile phone, also known as a cellphone or cellular phone, is a portable electronic device which behaves as a normal telephone whilst being able to move over a wide ar

3、ea (compare cordless phone which acts as a telephone only within a limited range). Cellphones allow connections to be made to the telephone network, normally by directly dialing the other partys number on an inbuilt keypad. Most current cellphones use a combination of radio wave transmission and con

4、ventional telephone circuit switching, though packet switching is already in use for some parts of the cellphone network, especially for services such as Internet access and WAP. Some of the worlds largest cellphone manufacturers include Alcatel, Audiovox, Kyocera (formerly the handset division of Q

5、ualcomm), LG, Motorola, Nokia, Panasonic (Matsushita Electric), Philips, Sagem, Samsung, Sanyo, Siemens, SK Teletech, and Sony Ericsson. There are also specialist communication systems related to, but distinct from cellphones, such as satellite phones and Professional Mobile Radio. Worldwide Deploym

6、ent Cellphones have a long arid varied history that stretches back to the 1950s, with hand held devices being available since 1983. Due to their low establishment costs and rapid deployment, cellphone networks have since spread rapidly throughout the world, outstrip ping the growth of fixed telephon

7、y. In most of Europe, wealthier parts of Asia, Australia, and the US, cellphones are now widely used, with the majority of the adult, teenage, and even child population owning one. The number of cell phone subscribers in the US has reached over 190 million. The availability of Prepaid or pay as you

8、go services, where the subscriber does not have to commit to a long term contract, has helped fuel this growth. Standardized Technology The cellphone has become ubiquitous because of the interoperability of cellphones across different networks 4nd countries. This is due to the equipment manufacturer

9、s all working to the same standard, particularly the GSM standard which was designed for Europe-wide interoperability. All European nations and some Asian nations chose it as their sole standard, while in Japan and South Korea another standard, CDMA, was select ed. Cellphone Culture In less than twe

10、nty years, mobile phones have gone from being rare and expensive pieces of equipment used by businesses to a pervasive low-cost personal item. In many countries, cellphones now outnumber land line telephones, with most adults and many children now owning cellphones. It is not uncommon for young adul

11、ts to simply own a cell phone instead of a land-line for their residence. In some developing countries, where there is little existing fixed-line infrastructure, the mobile phone has become widespread. Social Life With high levels of mobile telephone penetration, a mobile culture has evolved, where

12、the phone becomes a key social tool, and people rely on their cellphone addressbook to keep in touch with their friends. Many people keep in touch using SMS, and a whole culture of “texting“ has developed from this. The commercial market in SMSs is growing. Many phones even offer Instant Messenger s

13、ervices to increase the simplicity and ease of texting on phones. Entertainment The mobile phone itself has also become a totemic and fashion object, with users deco rating, customizing, and accessorizing their cellphones to reflect their personality. Like wise, customized ringtones have been develo

14、ped. Etiquette Cellphone etiquette has become an important issue with mobiles ringing at funerals, weddings, movies and plays. Users often speak at increased volume, with little regard for others nearby people. It has become common practice for places like libraries and movie theatres to ban the use

15、 of cell phones, sometimes even installing jamming equipment to prevent them. Media Cameraphones and videophones that can capture video and take photographs are increasingly being used to cover breaking news. Stories like the London Bombings, the Boxing Day Tsunami and Hurricane Katrina have been re

16、ported on by cameraphone users on news sites like NowPublic and photosharing sites like Flickr. Cellphone Features Cellphones are often packed with features that offer users far more than just the capability to send text messages and make voice calls. These may include internet browsing, music (MP3)

17、playback, personal organizers, email, watch/alarm, built-in cameras, ring tones, security measures (e. g. pin codes), SIM blocks, games, radio, push to talk, infra red and blue-tooth connectivity, and call registers. Network Features Though cellphones vary significantly from provider to provider, an

18、d even nation to nation (most noticeably in North America), all cellphones must generally accomplish tile same tasks regardless. Cellphones must be connected to the system of land-line phones. Cellphones must also be able to connect with each other just as easily, even if the two phones are not from

19、 the same mobile service provider. Consequently, all cellphone systems are comprised of two components; the handset, and the tower. The handset is the portable, referred to as the mobile phone, cellphone or a smartphone. The tower is a high-yield radio tower that the cellphones direct their radio co

20、mmunications to in order to connect to the network of telecommunications. It could also be a network of satellites. Network Working Process The Handset Handsets feature a low power transceiver that is typically designed to transmit voice and data, or analog audio only, up to a few kilometers under i

21、deal situations to where the tower is located. The handset listens for an available tower. Once found, the handset in forms that tower of its own unique identifier, and alerts the cellphone network that it is ready and standing-by to receive telephone calls. It then periodically repeats this informa

22、tion to the tower, and seeks out new towers over the duration it is powered on. The Tower Towers are large structures that feature a series of high power radio transmitters de signed to broadcast their presence and availability, and relay communications to the mobile handsets. The tower features a m

23、uch higher -powered radio transceiver array that allows it to provide a radio communications dialog with handsets dozens of kilometers away. The tower is connected to the landline telephone infrastructure by a high-capacity phone line, and may also be connected to a dedicated data line. The tower ca

24、n then route calls between the mobile handsets its serving, and telephone calls over the landline. Because the tower tracks and relays what mobile handsets it is servicing, it can inform the mobile network provider so that at any given time a call to a cellphone can quickly be traced to the :tower t

25、hat is servicing that handset. The Data Stream Most cellphones dialog between the handset and the tower is comprised of a data stream of digitized audio. The technology driving this process can vary, and in nations with no standard or preference (such as the United States), many incompatible technol

26、ogies exist. Not only do transmission standards potentially differ, but so do the radio frequencies. Some technologies include AMPS for analog, and TDMA, CDMA and GSM for digital communications. Though nations like the USA have generally avoided official standardization, most nations of the world ha

27、ve agreed upon the GSM data transmission protocol for cellphones, and a small range of possible frequencies that cellphones may operate on. Phones are classified based on the technology they use and the features they have. （分数：71.00）(1).The main difference between cordless phones and cellphones is t

28、hat cordless phones can only operate in a limited range. （分数：7.10）A.YB.NC.NG(2).Satellite phones and Professional Mobile Radios are a kind of cellphone. （分数：7.10）A.YB.NC.NG(3).Because cellphones are quick to deploy and cheap to establish, they have spread rapidly throughout the world. （分数：7.10）A.YB.

29、NC.NG(4).Because American cellphone users can choose either the prepaid service or pay as you go, cellphone subscribers have increased in number. （分数：7.10）A.YB.NC.NG(5).CDMA and GSM are the two main network services available in Australia. （分数：7.10）A.YB.NC.NG(6).Texting is uncommon in Asian countrie

30、s. （分数：7.10）A.YB.NC.NG(7).Cellphone etiquette has become increasingly more important. （分数：7.10）A.YB.NC.NG(8).Email, watch/alarm, built-in cameras, ringtones, and SIM blocks are all 1 of cellphones. （分数：7.10）填空项 1:_(9).Cellphones must not only be connected to the system of 1 but also must be able to

31、connect with each other just as easily, even if the two phones are not from the same mobile service provider. （分数：7.10）填空项 1:_(10).Although most nations around the world have agreed upon GSM data transmission protocol for cellphones, the US has avoided official 1. （分数：7.10）填空项 1:_三、Listening Compreh

32、ens(总题数：1，分数：15.00)A.Maria likes to talk on the phone with her friends.B.Maria doesnt like to talk on the phone with her friends.C.Maria doesnt have any friends.D.Maria has many friends.A.Walking.B.Boating.C.Driving.D.Shopping.A.She doesnt remember much about the city.B.Shes never been to the city.C

33、.She would find someone else to help.D.She would talk to the man later.A.The man bought the suit on saleB.The woman wants to buy the same suit.C.The woman likes the color of the suit.D.The man worked for the Sears last Sunday.A.The man thinks the room was not so dirty.B.The man thinks the room was v

34、ery dirty.C.The man thinks the room could be more dirty.D.The man disagrees with the woman.A.He was promoted.B.He had a traffic accident.C.He was fired.D.He was beaten by someone.A.By attending social events regularly.B.By looking at the bulletin boards.C.By phoning a special number.D.By reading the

35、 campus newspaper.A.The man just came back from a trip.B.The woman admired him very much.C.The woman was glad to see him back from the hospital.D.The man wanted to travel to another city.四、Section B(总题数：2，分数：10.00)A.When to move.B.Where to live the following year.C.How much time to spend at home.D.W

36、hose house to visit.A.Take some money to the housing office.B.Inform the director of student housing in a letter.C.Fill out a form in the history.D.Maintain a high grade average.A.Both live on campus.B.Both live off campus.C.The man lives on campus; the woman lives off campus.D.The woman lives on ca

37、mpus; the man lives off campus.A.Look for a new place to live.B.Borrow money for a car.C.Pay her deposit.D.Consider the situation further.A.To make an appointment to look at a house.B.To get information about special housing.C.To ask about getting a loan to buy a house.D.To renew his housing contrac

38、t.A.With his grandparents.B.In student housing.C.With his wifes parents.D.In his own apartment.A.He has more than one child.B.His wife is a graduate student.C.He is a full - time student.D.He works at the university housing office.A.Beauty.B.Loyalty.C.Luck.D.Durability.A.He wanted to follow the trad

39、ition of his country.B.He believed that it symbolized an everlasting marriage.C.It was thought a blood vessel in that finger led directly to the heart.D.It was supposed that the diamond on that finger would bring good luck.A.The two people can learn about each others likes and dislikes.B.The two peo

40、ple can have time to decide if they are a good match.C.The two people can have time to shop for their new home.D.The two people can earn enough money for their wedding.A.Trial-producing smaller cars to replace the bigger ones that are used today.B.Mass-producing some kinds of cars for tomorrow.C.Try

41、ing to make some new style vehicles that would be faster and safer than the ones used today.D.Designing some cars that would have many advantages over the ones used today.A.They are pretty, safe and cheap.B.They are cheap and durable.C.They are safe, cheap and clean.D.They are powerful, beautiful an

42、d easy to drive.A.Both the big and small cars have some defects.B.The speaker is fully optimistic that the new cars will replace the cars in use today.C.The number of cars in use today should be reduced because of the pollution in cities.D.Gasoline is a pollutant, so other kinds of fuel should be fo

43、und to replace it.A.He fell into the river but couldnt swim.B.He fell into the river together with his bike.C.He had his foot caught between two posts in the river.D.He dived into the river but couldnt reach the surface.A.He jumped into the river immediately.B.He took off his coat and jumped into th

44、e water.C.He dashed down the bridge to save the boy.D.He shouted out for help.A.He asked what the young mans name was.B.He asked the young man to take him home.C.He gave his name and then ran away.D.He thanked the young man and then ran away.六、Section C(总题数：1，分数：10.00)At any moment of the day or nig

45、ht, millions of children and teenagers are on line, exchanging e-mails and instant messages, surfing the World Wide Web and participating in chat rooms. Young people can get a lot of benefits from (36) 1online, but they might also be in danger. A little beep coming from the computer in her familys l

46、iving room (37) 2Jill Mentzer that an instant message had arrived for her 14-year-old daughter. She was (38) 3 to see that it came from a 36-year-old man. “He asked if I would be (39) 4 to have sex with older men for money. “ Ms. Mentzer told NBC News that she replied, (40) 5 to be her daughter. “It

47、 just . went on for 10 minutes. He wanted to know some private things about my daughter,“ she said. “I just (41) 6of played it along with him. Thats when we called the Sheriff and someone was there in 20 minutes. “ The police wired Ms. Mentzers daughter with a (42) 7microphone and watched as she wen

48、t to meet this man in a fast food restaurant. They arrested him for attempted molestation of a (43) 8. Ms. Mentzer said (44) 9. While that particular predator has been caught, there are plenty of others like him still online. (45) 10. They can go on line from personal computers at home, a friends house, in school, a club or cafe. (46) 11. （分数：10.00）填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_七、Reading Comprehensio(总题数：2，分数：355.00)Egyptian society had a strictly organized class structure. The majorit