大学英语新视野课后习题整理
1.Given the chance to show his ability,he regained confidence and began to succeed in school.
2.It is so difficult to explore the bottom of the ocean because some parts are very deep.
3.It was about 30 second before Alex emerge from the water;we were quite scared.
4.We often assume that when other people do the same things as we do,they do them for the samereasons;but this assumption is not always reasonable.
5.There is widespread concern that the rising unemployment may pose a threat to social stability.
6.After a comprehensive physical exam my doctor said I was in good condition except that my blood pressure was a little high.
7.It is well known that China ia a country with rich natural resources a very big population .
8.Some people believe that the earth can yield enough food to support at least twice its present population.
9.Saminherited the gift of imagination from his family,but he lacked the driving power to make action.
10.A bee that has found honey is able to transmit to other bees the information they need in order to collect the honey.
University students come from different parts of the country with various purposes. However, a closer look at their reasons for studying at the university will enable us to (1)classify them roughly into three groups: those who have a(n)(2) passion for learning, those who wish to (3) attain a bright future, and those who learn with no definite purpose.Firstly, there are many students who learn simply because they (4) pursue their goal of learning.Some read a wealth of British and American novels because they are keenly interested in literature. Others sit in front of the computer screen,working on a new program,(5) virtually day and night, because they find some computer programs (6) fascinating, and they dream of becoming a "Bill Gates" one day. Secondly, there are students who work hard mainly for a better and more (7) prosperous future. It seems that the majority of students fall into this group. After admission to the university, they read books after books to (8) acquire knowledge from all of the resources which are (9) available to them, and finally, to succeed in the future job market. Thirdly, there are still some students who learn without a clear goal. They take courses, finish homework, enjoy life on campus, but don't want to (10) sample anything new or challenging. They have no idea what they will be doing after college. And they may end up with nothing in their lives.
1. My family got by on my father's unemployment benefit after he lost his job.
2. Many subway riders read books or listen to music in order to make the most of their time on t he way to work.
3. In order to make sure he would be able to attend the meeting, I called him up two weeks in ad vance.
4. Experts say our company is amazing in that sales have been increasing steadily over time .
5. In order to reap the benefits of the physical exercise, you have to exercise regularly, and for at least half an hour each time.
6. They all tried to talk all at once , but I couldn't hear anything they said.
7. Yellow flowers in the field always remind me of my childhood in the countryside.
8. We have been practicing for so long and so hard that our team should stand a chance of winn ing the game.
9. Research on genes will open the door to exciting new medical treatments.
10. Every one of you has made a contribution and I take pleasure in acknowledging what each of
you has done to make this academic convention such a success.
孔子
Kong Zi is a famous thinker and educator in Chinese history. It is the founderof the Confucian school, and is honored as the ancient sage. His speech and life activities are recorded in the Analects of Confucius. The Analects of Confucius is a classical work of Chinese ancient culture, and has a great influence on the thinkers, writers and politicians of the later dynasties. Do not study the Analects of Confucius, we can not really grasp the traditional culture of China for thousands of years. Many thoughts of Kong Zi, especially his educational thoughts, have a profound influence on Chinese society. In twenty-first Century, Kong Zi's theory was not only the Chinese people'sattention, but also more and more attention by the whole international community.
1. He has a special feeling for the brilliant birds, and each spring he eagerly awaits their return.
2. Thanks to the efficiency of air transport, everyone is free to go anywhere at any time.
3. John believes that the donation of food to the hungry is more helpful than giving money.
4. Mary was a careful speaker; every word seemed to have been polished before it was allowed t o escape through her lips.
5. When she heard it was snowing in the city they were going to, she stuffed two more sweaters i nto her bag.
6. During our stay in Europe we visited many places of historical interest, including several castles
7. The wedding ceremony of my sister was a very emotional experience for our family.
8. He was embarrassed when he discovered that he didn't have enough money to pay for the red wine he had ordered.
9. The local government is pressed to find new places todump waste.
10. The new system designed to curb harmful emissions from factories will be put into use soon. Parents and teenagers have different or even opposite things to worry about. For example, while a mother might have a hard time understanding why her teenagers' room is always a(n) (1)embar rassment of dirty stuff, the teenagers are more worried about their next exams and may think it is (2)ridiculousfor their mother to insist on keeping a clean room. It is therefore important for you t o (3)appreciate the differences and learn to communicate with your teenagers properly. (4)other wise, your teenagers may say nothing and shut you out of their personal lives. Their refusal to tal k with you may even create (5)emotional stress in your life.Learning effective ways to communica te can (6)reverse the situation of a difficult relationship, (7)reduce the stress of your life, and lead to a friendly relationship with your teenagers. First, you should learn to discuss serious problems in daily conversations. So, important topics, such as driving a vehicle and building a(n) (8) romanti c relationship, could be dealt with through daily conversations.Second, learn to be an active listen er. Many parents are so (9)overwhelmed with their work that they could hardly take some time f or their (10)beloved children. Spend your time listening carefully to what your children like to talk about, and make sure your children feel they are being taken seriously. This will increase the cha nces of good communication.
1. After 10 years of full-time training, she has finally make it as a professional dancer.
2.After all , what is the point in taking part in the competitive event if the result is only to prove h ow incompetent you are?
3. Redecorating the house is a challenging task. It's necessary to strip off the wallpaper first.
4. I never really had any problems with change. On the contrary, I welcome change with open ar
ms .
5. A lot of what we throw away is made from raw materials which are not renewable.
6. Megan and John realized that their house was too messy for a new baby, so they decided to str aighten up their house before the baby was born.
7. Jennifer couldn't keep back her tears when she saw the sick children at a new blood cancer ce nter in Virginia.
8. We want to give all children a world free of/from violence.
每年农历八月十五
According to the Chinese lunar calendar, August 15 of every year is a traditional Chinese festival — the Mid-Autumn Festival. This day is the middle of autumn, so it is called Mid-Autumn. One of the important Mid-Autumn Festival activities is to enjoy the moon. On that night, people gather t ogether to celebrate the Mid-Autumn Festival, looking up at the bright moon and eating moon ca kes. The festival is also a time for family reunion. People living far away from home will express th eir feelings of missing their hometowns and families at this festival. There are many customs to c elebrate the festival, all expressing people's love and hope for a happy life. Since 2008, the Mid-A utumn Festival has become an official national holiday in China.
1.To make our companies competitive in the market, we have to be more creative and productive .
2.People are beginning to realize that to transform nature at will is the biggest mistake that man has ever made.
3.It is difficult to conclude what a(n) typical student does in his spare time because every student has different interests.
4.A month ago I wrote to the store complaining about its bad service, but I haven't gotten a(n) re sponse yet.
5.Some of your suggestions have been adopted , but others have been turned down as they are n ot workable.
6. All of a sudden, he lost his interest in engineering, and focused his attention on learning a forei gn language.
7.If a company decreases health benefits for its employees, they should increase salaries to comp ensate the workers.
8.I failed to pass the exam although I had worked very hard.I should analyze the causes of my failure.
9.When you do yoga, try to regulate your breathing. Don't breathe too fast and make sure you br eathe only through your nose.
10.It was difficult to estimate how many people had been wounded in the earthquake
There have been increased demands for higher education to provide students with better courses and more opportunities. To deal with this (1) complex issue, colleges and universities are turning to the Internet for quick (2)access to its rich educational resources. Now the Internet has been ac cepted as the (3)preferred technology to many other methods in colleges and universities. Many teachers now routinely (4)post their teaching materials online. A growing number of schools offer at least some (5)courses over the Internet. There are two different models of making use of the I nternet for higher education. The first model (6)undergraduate to improve existing courses by usi ng the Internet. This model provides high-speed Internet (7)connectivity to all students, faculty, a
nd staff. While this model uses the Internet, it doesn't (8)require many changes, and it keeps mos t existing institutional structures unchanged. A different, more revolutionary model regards the In ternet as (9)indispensable to an important change in higher education, for it is believed that the I nternet can (10)transform teacher-centered instruction into student-centered learning. This, as a result, will bring about basic change to our university education.
1. I fired off a letter of complaint to the manager of the store as soon as I found they had sold me
a pair of mismatched shoes.
2. People browse the Internet, read newspapers and watch TV to keep up with what is happenin
g in the world.
3. The university has set up another large laboratory for students to design more complicated ro bots.
4. I find it very difficult to account for the fact that two of our best students failed the exam.
5. In the current economy, with unemployment high and competition for jobs fierce, your resume needs to stand out for all the right reasons.
6. She is getting popular since she appeared in a TV interview last month. Her new movie will no doubt add to her growing fame.
7. The developed countries should take the lead in reducing greenhouse gas emissions (排放) and provide support for the developing nations to follow.
8. If your spoken English is not very good, then you may be at a disadvantage when you are looki ng for a job.
9. Their success was due in large part to their well-conceived (周密策划的) plan.
10. He has been so occupied with his work these days that he barely has time tovisit with his frie nds.
中国航天业
China's space industry was launched in 1956. Over the past decades, China's space industry has c reated one miracle after another. In 1970 China launched its first man-made earth satellite, ranki ng China the fifth country in the world to independently develop and launch man-made earth sat ellites. In 1992 China began to carry out the manned spaceflight program. In 2003 China launched Shenzhou-5, a manned spaceship. The successful launch made China the third country to launch manned spaceships. In 2007 Chang'e-1, the first lunar-orbiting man-made satellite, was sent to sp ace. In 2013 Shenzhou-10, the fifth manned spaceship, was launched successfully, laying the foun dation for building the Chinese Space Station.
1.Fortunately,the accident didn’t invplve many people,for there was little traffic at that hour.
2.She fulfilled her ambition of becoming a fashion designer after years of hard work.
3.They kept on trying their best to develop their business,but in such intense market
competition,they had no idea if success would come along one day.
4.As music plays an important role in our life,many music teachers and educators advocate
taking up a musical instrument at a young age.
5.This rule should be entirely clear in the minds of everyone and should not be misunderstood
under any circumstances.
6.My daughter was shy;she was afraid to ask questions,responded to questions in class,or talk
with other children.
7.I got from him only a letter,which was put on my office desk;subsequent to the receipt of this
letter I have never heard from him.
8.The duties to provide services for children in need are not confined to the local social
services department.
9.We pray that all nations be reconciled and that all people around the world live in peace.
10.He suggested a small but distinct improvement on our former plan;I really appreciate it.
In January 2011,Daniel Hernandez saved congresswoman Gabrielle Giffords’life in a mass shooting in Tucson. He kept her alive by 1)applying pressure to her wounds and speaking 2)tender words of sympathy until medical people arrived.He was 3)hailed as a hero by the public.Although his devotion to public service is 4)remarkable,in his book They Call Me a Hero:A Memoir of My Youth,Hernande insists that he is not a hero.
Hernandez said that he initially resisted the idea of writing a book about his experience on that day of enormous 5)tragedy .”I had been 6)pushed by a few publishers after the incident,”he said. “I thought heroes should be people who make a lifetime 7)commitment to helping others.”However,Hernandez,now a school board member,had come to realize that he would be interested in writing a book 8)focusing on his public services.”Asayoung official, I’ve faced some big challenges, and I want young people to know that they need to face challenges and 9)involve themselves in their communities.”
When asked if he had any plan with a second book, Hernandez said his major purpose at present was to continue to serve his community and pursue his passion asa 10)advocate for education.”But I’m not going to say no,”he said.
1.She held her hand above her eyes to shield them from the sun so that she could see more
clearly the man in front of her.
2.The boy studied the signs for over an hour,but still could not make sense ofthem,so he
turned them,soheturned to his teacherfor help.
3.They called on the developed countriesto commit more money to protecting the
environment.
4.We will continue to care for those in need and work to establish a society that is generous
and prosperous.
5.Many people are caught up in careers and raising kids so that they forget that their marriages
also need to be taken good care of.
6.My most favorite program is the one that deals with scientific subjects that ordinary people
can relate to.
7.Finally,I would like to sum up by saying that it has been a tremendous pleasure to work with
you all.
8.He is a person that you can always count on when you need help.
9.Betty loves reading. In the words of Betty”Reading is the most wonderful thing in the world.”
10.This restaurant is very popular because it has some separate, smaller rooms reserved for
families with small children.
郑和是中国历史上最著名的航海家
Zheng He was the most famous maritime explorer in Chinese history. In 1405 AD, the ruler of the Ming Dynasty sent Zheng He on a voyage to the Western Seas in order to strengthen bor der defense and develop trade by sea. In the following 28 years, Zheng He led his fleet, made seven voyages to the Western Seas with over 100,000 crew members in total, and visited mo re than 30 countries and regions. The fleet traveled far into South Asia and West Asia, and m
ade all the way to the continent of Africa. Zheng He's voyages to the Western Seas were a gre at feat in the world's navigation history. It showed Zheng He's outstanding navigation and org anization talents; meanwhile, it exhibited the national strength and prestige of the Ming Dyn asty, and strengthened the relationships between the Ming Dynasty and the overseas countri es.
1.Studies indicate that children who often take part in cooperative programs benefit a lot
more than other children.
2.They are such a conventional family-they must have been shocked when their son dyed
his hair pink.
3.Testing students by examinations has long been regarded as a reliable way to assess
students’ ability.
4.Many power stations have been modernized to give off less pollution, or they were
moved further away from the living areas in order to decrease the damage.
5.Unemployment has come down slightly, but this does not alter the fact that it is still a
major problem.
6.Mr.Smith is not doing well;the doctor told us that several colds has undermined his
health.
7.The best way to deal with problems at home is to talk things out calmly and honestly and
try to reach a compromise.
8.Darwin’s theory of evolution remains controversial partly because it challenges the
religious belief that God created man.
9.It was reported the president had resolved to fight if war was necessary, even if it meant
destroying his chances of re-election.
10.I had to abandon one of my email accounts as it was filled with junk mail.
Nowadays college education cost is rising sharply. More and more college students have to work in order to 1)generate income to support themselves. But how can you prevent working from 2) interfering with your study?
Firstly,plan your class and work 3) schedules as far ahead as possible. Arrange your classes in a way so that you have one or two days for work.
Secondly, use time well instead of 4)burning the midnight oil. Studying late until midnight may make you tiredand take a 5) consistent toll on your health. Use those 10 minutes waiting for the bus to read a few more pages.If your job has a lot of downtime, use the 6) opportunity to do school assignments.Never try to cut corners by copying assignments from other students.
Thirdly,set a goal for your academic performance. You’ll probably have to 7) decrease your work hours, or even, if possible and necessary, 8) withdraw from the workforce to be successful in study. After all, it is not a good idea to risk 9)compromising your student career with part-time jobs.
Fourthly, inform all your professors, teaching assistants and employers about your situation so that they can be 10) flexible as well. Winning their support is the best way to keep them on your side.
1.The new government has committed to cutting back on emissions of greenhouse gases.
2.My parents do not object to my taking part-time jobs, but they remind me not to let them
interfere with my school work.
3.Anger, worry, disappointment, these negative emotions take a toll on your heart, brain and
body.
4.If a person adopts an unhealthy lifestyle, he will surely be at risk of developing diseases.
5.Most people were ready to give up on him when he dropped out of school, but later he
returned and earned his degree.
6.Drinking too much can increase the risk of developing high blood pressure, which in turn can
lead to heart attack or stroke.
7.Low-cost airlines are emerging all over Asia; this will contribute to the development of the
world’s air-travel market as a whole.
8.When you move to a new country, you may find the food there strange and you may miss the
familiar smells of the food you are accustomed to in your own country.
9.Although he kept trying and failing, I always held on to the belief that he would succeed one
day.
10.The tax only affects people with an annual income over $2000000-in other words it will only
affect the very rich.
改革开放以来
Since its economic reform and opening-up to the world, China's education has gone through rapid development and made remarkable achievements. The Chinese government gives top priority to the development of education, persists in revitalizing the country by science and e ducation, and fully advocates quality-oriented education. Meanwhile, it actively promotes eq uality in education to guarantee everyone access to education. China's achievements in educ ation can be reflected in two different layers: One is the popularization of the nine-year comp ulsory education; the other is the realization of mass higher education. The development of e ducation has made significant contributions to China's economic development and social pro gress. In recent years, to satisfy the needs of social and economic development, the Chinese government has sped up the training of qualified personnel urgently needed in various fields.
1.If you promise you won’t reveal my name, I will tell you the true story.
2.Are you implying that I am the one to blame? I didn’t do anything wrong!
3.While advertisements do not necessarily present accurate information, they do make people
aware of the availability of products that could improve their lives.
4.He exaggerated the dangers of the trip to the mountain in order to frighten the children out
of going.
5.You have to eliminate all the mistakes from the essay before you hand it in.
6.The new policy was expected to facilitate the development of trade between the two cities.
7.She was frustrated by her failure in applying for the post she had long dreamed of.
8.In most cultures it is not appropriate for one to wear a red dress or suit at a funeral.
9.He suddenly became conscious that he was the only person who wasn’t dressed formally at
the reception.
10.To launch this new product into the European market, the company gave away 10000 free
samples to the local consumers to try.
Plagiarizing, copying a peer’s test answers, and buying essays online are all ways in which college students cheat. According to a survey, nearly 80% of the students interviewed 1) admitted cheating at some point during their educational 2) career. The consequences are
severe, ranging from a failing grade to being 3) expelled from college.
But why do students cheat? In college, the 4) pressure to do well is very high. Students know that without 5) satisfactory grades, their potential for success at school would be limited, so they sometimes copy their peers’answers in the exam. Besides, with today’s technology, there is more information 6) available online than ever before. Students don’t have to 7) browse the Internet long to find essays for sale.
These are just some of the reasons why college students might cheat. Although colleges do everything they can to 8) prevent cheating, it still goes on. And cheating becomes more 9) extensive in some schools. But students should think about the consequences they will 10) confront. They should stop and think about how happy and proud they will be when they earn a good grade in an honest way.
1.The activities of famous people always attract people’s attention, not to mention their
marriages and divorces.
2.You are free to use the resources in the library or on the Internet, but you most turn in a
paper written in your own words.
3.Some taxis do not have a meter. Then it’s easy for some dishonest taxi drivers to rip off
their passengers.
4.All the employees must work hard to cope with the present financial difficulties in order
to triumph over them in a short period of time.
5.She has already launched a campaign for a charity that helps people suffering from
unusual diseases.
6.You really believe that this medicine can cure all diseases? If this is the case , we don’t
need doctors or hospitals any more.
7.In my opinion, educational reforms should not be confined to big cities alone, where
conditions are already much more advanced than in the countryside.
8.Lecturers and journalists have been arguing over a serious question: Will this area
descend into chaos if another major strike takes place?
为人诚信，以和为贵是中华民族的传统美德
Integrity and harmony are traditional Chinese virtues. “Harmony” is demonstrated in various aspects. In regard to interpersonal relations, traditional Chinese thoughts hold that “Harmony is most precious” and “A family that lives in harmony will prosper”.A harmonious social environment can be created based on these principles. As for relations between human beings and nature, people should learn to understand, respect and protect nature. Harmony is essential to interpersonal relations, relations between human beings and society, as well as between human beings and nature.
Nowadays, harmonious development is still the way of running the country and managing talented personnel. With the development of China’s society, economy and culture, the idea of “harmony” goes even deeper into people’s hearts. China is on its way toward the goal of building a harmonious socialist society.
温病学题库
温病学题库 南京中医药大学 临床基础教研室 目录
第一章绪论第二章温病的概念第三章温病的病因病机第四章温病的辨证第五章温病常用诊法第六章温病的治疗 第七章温病的预防第八章风温 第九章春温第十章暑温 第十一章湿温第十二章伏暑 第十三章秋燥第十四章大头瘟 第十五章烂喉痧第十六章温疫 第十七章疫疹第十八章疟疾 第十九章霍乱第二十章《温热论》第二十一章《湿热病篇》 第二十二章《温病条辨》选
第一章绪论 单项选择题 １．创立卫气营血辨证的医家是：（） Ａ．王孟英Ｂ．叶天士Ｃ．余师愚Ｄ．吴鞠通 ２．余师愚的代表着作是：（） Ａ．《广温疫论》Ｂ．《疫疹一得》Ｃ．《温疫论》Ｄ．《伤寒温疫条辨》3．首先提出温病有新感、有伏气的医家是：（） Ａ．王安道Ｂ．郭雍Ｃ．刘河间Ｄ．朱肱 4．我国医学发展史上第一部温疫专着是：（） Ａ．《温热论》Ｂ．《温热经纬》Ｃ．《温疫论》Ｄ．《肘后备急方》 5．温病的病名首见于：（） Ａ．《黄帝内经》Ｂ．《伤寒论》Ｃ．《外台秘要》Ｄ．《肘后方》 6．首先提出运用辛温发表剂治疗外感病，必须因时、因地、因人而灵活加入寒凉清热等药物的医家是：（） Ａ．王安道Ｂ．汪石山Ｃ．朱肱Ｄ．刘河间 7．在温病学发展的成长阶段，“创新论、立新法、订新方”的医家是：（）Ａ．朱肱Ｂ．王安道Ｃ．吴又可Ｄ．刘河间 8．在温病学发展史上，首先提出温病不得混称伤寒的医家是：（） Ａ．吴又可Ｂ．吴鞠通Ｃ．刘河间Ｄ．王安道 9．我国医学发展史上可称为温病学奠基作的专着是：（） Ａ．《温热论》Ｂ．《温疫论》Ｃ．《温热经纬》Ｄ．《温病条辨》 10．下述哪项不是吴又可的贡献（） Ａ．编着了我国医学史上第一部温病专着－－《温疫论》 Ｂ．提出瘟疫致病的原因是时行之气 Ｃ．指出瘟疫有强烈的传染性Ｄ．感邪途径是邪从口鼻而入 11．论述湿热病的病因、病机、辨证施治的专着是：（） Ａ．《温热论》Ｂ．《外感温病篇》Ｃ．《湿热病篇》Ｄ．《疫病篇》 12．“以轩岐仲景之文为经，叶薛诸家之辨为纬”，对温病学的理论和经验作了较全面的整理，为促进温病学的发展做出了贡献的医家是：（） Ａ．吴又可Ｂ．吴鞠通Ｃ．汪机Ｄ．王孟英 13．“冬伤于寒，春必病温”出自：（） Ａ．《素问·评热病论》Ｂ．《素问·至真要大论》 Ｃ．《素问·玉版论要篇》Ｄ．《素问·生气通天论》 14．提出“一岁之中，长幼之病多相似者，此则时行之气”的医家是：（）Ａ．王安道Ｂ．张仲景Ｃ．庞安常Ｄ．王叔和 15．温病隶属于伤寒是在：（） Ａ．宋到元代Ｂ．明到清代Ｃ．战国到晋唐Ｄ．民国时代 16．吴又可是：（） Ａ．认为温疫初起病邪伏在膜原的医家Ｂ．创立卫气营血理论的医家 Ｃ．提出水湿在三焦辨治理论的医家Ｄ．创立三焦辨治理论的医家 二.选择多项题 １．《内经》中提出预防疫病的关键是：（）
大学英语新视野答案
Part 1 Short dialogs and multiple choice questions (每小题：分) Directions: Listen to the short dialogs, then choose the correct answers to the questions. You will hear the recording twice. After the first playing, there will be time for you to choose the correct answers. Use the second playing to check your answers. Questions 1 to 1 are based on the following passage or dialog. 1. A. Decrease imports. B. Increase imports. C. Decrease its deficit by 5%. D. Increase its deficit by 5%. Questions 2 to 2 are based on the following passage or dialog. 2. A. Raise the oil prices. B. Import less oil. C. Use less oil. D. Take buses more frequently. Questions 3 to 3 are based on the following passage or dialog.
(完整版)课后习题
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Part 1 Short dialogs and multiple choice questions (每小题：分) Directions: Listen to the short dialogs, then choose the correct answers to the questions. You will hear the recording twice. After the first playing, there will be time for you to choose the correct answers. Use the second playing to check your answers. Questions 1 to 1 are based on the following passage or dialog. 1. A. Decrease imports. B. Increase imports. C. Decrease its deficit by 5%. D. Increase its deficit by 5%. Questions 2 to 2 are based on the following passage or dialog. 2. A. Raise the oil prices. B. Import less oil. C. Use less oil. D. Take buses more frequently. Questions 3 to 3 are based on the following passage or dialog.
课后习题汇总讲解
习题一、术语解释 OSI参考模型网络体系结构波特率比特率捎带确认误码率冲突 虚拟局域网生成树协议CIDR 路由汇聚熟知端口号三次握手死锁 端口号URL DNS DOS DDOS 对称加密 防火墙非对称加密入侵检测系统木马程序数字签名 二、选择题（请从4个选项中挑选出1个正确答案） 1. 以下关于网络协议与协议要素的描述中错误的是. A A. 协议表示网络功能是什么 B. 语义表示要做什么 C. 语法表示要怎么做 D. 时序表示做的顺序 2. 以下关于网络体系结构概念的描述中错误的是. B A. 网络体系结构是网络层次结构模型与各层协议的集合 B. 所有的计算机网络都必须遵循OSI体系结构 C. 网络体系结构是抽象的，而实现网络协议的技术是具体的 D. 网络体系结构对计算机网络应该实现的功能进行精确定义 1. 设立数据链路层的主要目的是将有差错的物理线路变为对网络层无差错的. B A. 物理链路 B. 数据链路 C. 点-点链路 D. 端-端链路 2. 帧传输中采取增加转义字符或0比特插入的目的是保证数据传输的. C A. 正确性 B. 安全性 C. 透明性 D. 可靠性 5. 0比特插入/删除方法规定在数据字段检查出连续几个1就增加1个0？B A. 4 B. 5 C. 6 D. 7 7. 如果G (x）为11010010，以下4个CRC校验比特序列中只有哪个可能是正确的？D A. 1101011001 B. 101011011 C. 11011011 D. 1011001 19. PPP帧的链路最大帧长度的默认值是. D A. 53B B. 536B C. 1200B D. 1500B 8. 以下对于Ethernet协议的描述中，错误的是.D A. Ethernet协议标准中规定的冲突窗口长度为51.2μs B. 在Ethernet中的数据传输速率为10Mbps，冲突窗口可以发送512bit数据 C. 64B是Ethernet的最小帧长度 D. 当主机发送一个帧的前导码与帧前定界符时没有发现冲突可以继续发送 9. 以下对于随机延迟重发机制的描述中，错误的是. D A.Ethernet协议规定一个帧的最大重发次数为16 B. Ethernet采用的是截止二进制指数后退延迟算法 C. 后退延迟算法可以表示为：τ＝2k·R·a D. 最大可能延迟时间为1024个时间片 10. 以下对于Ethernet帧结构的描述中，错误的是. C A. 802.3标准规定的“类型字段”对应Ethernet V2.0的帧的“类型/长度字段” B. DIX帧中没有设定长度字段，接收端只能根据帧间间隔来判断一帧的接收状态 C. 数据字段的最小长度为64B，最大长度为1500B D. 目的地址为全1表示是广播地址，该帧将被所有的节点接收 11. 以下关于Ethernet帧接收出错的描述中，错误的是. A A. 帧地址错是指接收帧的物理地址不是本站地址 B. 帧校验错是指CRC校验不正确 C. 帧长度错是指帧长度不对 D. 帧比特位错是指帧长度不是8位的整数倍