1、高考资源网（） 您身边的高考专家Unit4 The underground in the world 同步练习(七)总分 100分 时间 60 分钟 成绩评定 _预习作业I.阅读短文并回答问题 (共14分)Maglev is short for magnetic levitation(漂浮), which means that these trains will float over a guide way(导轨) using the basic principles of magnets to replace the old steel wheel and track trains. The
2、 magnetized coil (电线圈) running along the track, called a guide way, repels the large magnets on the trains undercarriage (车盘), allowing the train to levitate (飘浮) between 0.39 and 3.93 inches (1 to 10 cm) above the guide way . Once the train is levitated, power is supplied to the coils within the gu
3、ide way walls to create a unique system of magnetic fields that pull and push the train along the guide way. The electric current supplied to the coils in the guide way walls is constantly alternating to change the polarity (极性) of the magnetized coils. This change in polarity causes the magnetic fi
4、eld （磁场） in front of the train to pull the vehicle forward, while the magnetic field behind the train adds more forward thrust (推力). The magnetic field created in this wire-and-battery experiment is the simple idea behind a maglev train rail system. There are three components to this system:A large
5、electrical power source Metal coils lining a guide way or track Large guidance magnets attached to the underside of the train. The big difference between a maglev train and a conventional train is that maglev trains do not have an engine. at least not the kind of engine used to pull typical train ca
6、rs along steel tracks. The engine for maglev trains is rather inconspicuous （不显眼的，不引人注意的）. Instead of using fossil fuels (矿物燃料), the magnetic field created by the electrified coils in the guide way walls and the track combine to propel (推进) the train.Maglev trains float on a cushion of air (气垫), eli
7、minating friction (摩擦). This lack of friction and the trains aerodynamic (空气动力学的) designs allow these trains to reach unprecedented (空前的) ground transportation speeds of more than 500 kph. In comparison, a Boeing-777 commercial airplane used for long-range flights can reach a top speed of about 789
8、kph. Once manufacturers can prove that maglev trains can transport passengers safely at such high speeds, maglev trains could become an ideal alternative to airplanes. Developers say that they will likely link cities that are up to 1,609 km apart. At 500 kph, you could travel from Paris to Rome in j
9、ust over two hours.Questions :1. B What is guide way and how does it work?_2. A What does maglev mean?_3. A How many components are there to a maglev train rail system?_4. B What is the difference between a maglev train and a conventional (常规的，传统的) train?_5. A How fast can maglev trains travel?_课堂作业
10、 II. 完形填空（每题1.5分，共30分）Today, most countries in the world have canals. Many countries have built canals near the coast, and parallel _1 the coast. Even in the twentieth century, goods can be moved more cheaply by boat than by any other_2_of transport. These _3_make it possible for boats to travel _4_
11、ports along the coast without being_5_to the dangers of the open. Some canals, such as the Suez and the Panama, save ships weeks of time by making their_6_ a thousand miles shorter. Other canals permit boats to reach cities that are not_7_on the coast, still other canals _8_ lands where there is too
12、 much water, help to 9 fields where there is not enough water, and 10 water power for factories and mills. The size of a canal 11 on the kind of boats going through it. The canal must be wide enough to permit two of the largest boats using it to 12 each other easily. It must be deep enough to leave
13、about two feet of water 13 the keel of the largest boat using the canal. When the planet Mars was first 14 through a telescope, people saw that the round disk of the planet was crisscrossed by a 15 of strange blue-green lines. These were called “canals” 16 they looked the same as canals on earth 17
14、are viewed from an airplane. However, scientists are now 18 that the Martian phenomena are really not canals. The photographs 19 from space-ships have helped us to 20 the truth about the Martia “ canals”. 1. B A. off B. with C. to D. by 2. A A. way B. means C. method D. approach 3. A A. waterways B.
15、 waterfronts C. channels D. paths 4. B A. among B. between C. in D. to 5. B A. revealed B. exposed C. opened D. shown 6. A A. trip B. journey C. voyage D .route 7. B A. lain B. stationed C. set D. located 8. A A. escape B. drain C. dry D. leak 9. B A. water B. wet C. soak D. irrigate 10.B A. furnish
16、 B. afford C. offer D. give 11.B A. focuses B. bases C. depends D. takes 12. A A. cross B. pass C. move D. advance 13. B A. down B. below C. beneath D. off 14. B A. studied B. researched C. surveyed D. observed 15.A A. few B. number C. deal D. supply 16. A A. although B. because C. so D. if 17. B A
17、.that B .where C. when D. as 18. B A. exact B. definite C. certain D. decisive 19. B A. held B. taken C. got D. developed 20. B A. find B. expose C. uncover D. discoverIII. 阅读理解 （每题4分，共32分） (A)TOKYO An express train traveling through strong winter winds derailed in northern Japan, killing four peopl
18、e and injuring more than 30, officials said Monday.Five cars of the six-car express train derailed Sunday evening, three of them topping onto their sides in Yamagata, about 189 miles north of Tokyo. The train was going from northern Akita to Niigate.The injuries of the survivors did not appear to be
19、 life-threatening, Yamagata police spokesman Yoshikatsu Oe said. It was unclear how many passengers were on the train, but Oe said most of the injured were in the first two cars. The dead included two men and two women. One of the men was pulled from the wreckage (残骸) early Monday and was believed t
20、o be the last body on the train.Rescuers planned to lift the wreckage later in the day to see if any other passengers remained beneath.Transport Ministry official Hiromi Mishima said it was not know what caused the derailment and officials were assessing the extent of the damage. Railway operator JR
21、 East Co. President Mutsutake Otsuka apologized for the accident at a news conference Monday morning and promised a thorough investigation. Yamagata police official Yasuhiro Sugiu said there had been high-speed wind warnings for the area. Public broadcaster NHK (日本广播协会) quoted a train conductor as s
22、aying a strong wind hit the train just before the accident. Winds in the area were about 48 mph, Kyodo News agency reported.Japan in recent days has suffered from unusually heavy snowfall, and storms have led to the deaths of eight people. But snow did not appear to be a factor in Sundays crash.Auth
23、orities said they did not know how fast the train was going. Speed was believed to be a factor in an April 25 train wreck that killed 107 people and injured more than 500 others in Amagasaki, western Japan. That accident was Japans worst train wreck since 1963.1. B The best title for this passage wo
24、uld be _.A. Train derails in JapanB. Strong winds causes disasterC. Terrible car accidentsD. Terrible accidents in the past years2.B How many people were killed in the train accidents mentioned here?A. 119.B. 105.C. 107.D. 111.3. A The accident took place _.A. on Monday morning in northern AkitaB. o
25、n Sunday evening in YamagataC. on Monday morning to the north of TokyoD. on Sunday evening in Niigata4. B From the report we learn that _.A. a strong wind resulted in the accident B. the high speed of the train led to the disasterC. the heavy snowfall caused the trouble D. the cause of the derailmen
26、t is still unclear (B)I was walking along Orchard Road when I realized a tall young man wearing a jacket and tie was following me. I noticed him because not many people wear a jacket and tie in the middle of a hot summer day, and I had already seen this man four times that afternoon.To make sure he
27、was following me, I walked on quickly, turned right into a shopping center and then stopped to look in a shop window. Soon the man appeared and stopped at another shop window. I walked on and stopped several times. When I stopped, he stopped too.I began to be rather worried and decided to try to los
28、e this strange man. When I saw a taxi coming, I jumped into it. As I was telling the taxi driver where to go, I found the man get into another taxi, which then followed mine. As the two taxies slowly made their way along Orchard Road, I looked back at the taxi behind, and saw that the stranger was l
29、ooking out at me. At MRT station, I told the taxi driver to stop and I got out. As I was paying my fare, I saw the man was getting out of his taxi.By now I got angry, so I turned and walked straight to him. I asked him why he was following me. At first he said he was not following me at all, but whe
30、n I threatened(威胁) to call the police, he admitted he was. He then told me that he was a news reporter and that he was writing an article on how elderly people in Singapore spend their time. He said he was observing me to gather materials for his article.1. A What is strange about the man who follow
31、ed the writer? A. He seemed to be wearing too much.B. He was out on such a hot day. C. He walked quickly behind.D. He was a tall young man.2. A What did the stranger do when the writer jumped into a taxi? A. He got into another taxi.B. He tried to stop the taxi. C. He almost gave up following him.D.
32、 He made his way along Orchard Road.3. A How did the writer have the stranger admit he was following him? A. He threatened to take him to the police.B. He called the police. C. He said he would call the police.D. He talked to the police.4. B Why did the stranger follow the writer? A. He was interest
33、ed in elderly people.B. He often does such things. C. He was writing a book about young people.D. He needed materials for his article.课外作业 IV. 书面表达 (共25分) B昨天，你收到好友的来信， 在信中想知道从青岛到广州乘飞机和坐火车旅游有哪些不同及你的观点。请你根据下列提示，给写一封回信，介绍相关的情况并提出相关的建议。词数：120左右交通工具飞机火车价格900元250元旅行时间2小时28 小时优点省时、舒适便宜、可以观光缺点昂贵耗时、拥挤、不利于休息
34、答案I. 略II. CBABB CDBDA CBCDB BACBDIII. A) ADBD B) AACDIV. One possible version:Dear Bob, Im very glad to receive your letter . In you letter , you told me that you would come to China next month and asked me what were the differences between the air travel and the train travel from Qingdao to Guangzh
35、ou . Now Ill tell you some information about it. The air travel has two advantages over the train travel. First , it can save much time .You can fly from Qingdao to Guangzhou in two hours, but by train, you have to spend 28 hours or more. Second , the air travel is more comfortable , because the pla
36、ne flies so smoothly that you can have a good rest during the trip, while the train is crowded and passengers have to sit a long time , which makes them tired. However, the train also has its own advantages. For example, traveling by train costs only 250 yuan while it costs 900 yuan by air. Besides, you can enjoy the views of many big cities during the train travel. So I think different people will take different ways of traveling. The above information is what I want to tell you. I hope it will give you help.- 4 - 版权所有高考资源网
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