12英语四级考试全真模拟卷C下载版.docx

1、12英语四级考试全真模拟卷C下载版 大学英语四级考试全真预测试卷Model Test FourPart I writing (30 minutes)Directions: For this part, you are allowed 30 minutes to write a composition on the topic Dormitory Life . You should write at least 120 words following the outline given below in Chinese:1. 大学宿舍的集体生活是全新的体验。2. 宿舍生活与在家生活的不同之处。3

2、. 宿舍生活利与弊。Dormitory LifePart II Reading Comprehension (Skimming and Scanning)(15 minutes)Directions: In this part, you will have 15 minutes to go over the passage quickly and answer the questions on Answer Sheet 1. For questions 1-7, choose the best answer from the four choices marked A, B, C and D.

3、 For question 8-10, complete the sentences with the information given in the passage.Animals on the MoveIt looked like a scene from “Jaws” but without the dramatic music. A huge shark was lowly swimming through the water, its tail swinging back and forth like the pendulum of a clock. Suddenly sensit

4、ive nerve ending in the sharks skin picked up vibrations of a struggling fish. The shark was immediately transformed into a deadly, efficient machine of death. With muscles taut, the shark knifed through the water at a rapid speed. In a flash the shark caught its victim, a large fish, in its powerfu

5、l jaws. Then, jerking its head back and forth, the shark tore huge chunks of flesh from its victim and swallowed them. Soon the action was over. Moving to SurviveIn pursuing its prey, the shark demonstrated in a dramatic way the important role of movement, or locomotion, in animals. Like the shark,

6、most animals use movement to find food. They also use locomotion to escape enemies, find a mate, and explore new territories. The methods of locomotion include crawling, hopping, slithering, flying, swimming, or walking. Humans have the added advantage of using their various inventions to move about

7、 in just about any kind of environment. Automobiles, rockets, and submarines transport humans from deep oceans to as far away as the moon. However, for other animals movement came about naturally through millions of years of evolution. One of the most successful examples of animal locomotion is that

8、 of the shark. Its ability to quickly zero in on its prey has always impressed scientists. But it took a detailed study by Duke University marine biologists S. A. Wainwright, F. Vosburgh, and J. H. Hebrank to find out how the sharks did it. In their study the scientists observed sharks swimming in a

9、 tank at Marine land in Saint Augustine, Fla. Movies were taken of the sharks movements and analyzed. Studies were also made of shark skin and muscle. Skin Is the KeyThe biologists discovered that the skin of the shark is the key to the animals high efficiency in swimming through the water. The skin

10、 contains many fibers that crisscross like the inside of a belted radial tire. The fibers are called collagen fibers. These fibers can either store or release large amounts of energy depending on whether the fibers are relaxed or taut. When the fibers are stretched, energy is stored in them the way

11、energy is stored in the string of a bow when pulled tight. When the energy is released, the fibers become relaxed. The Duke University biologists have found that the greatest stretching occurs where the shark bends its body while swimming. During the bodys back and forth motion, fibers along the out

12、side part of the bending body stretch greatly. Much potential energy is stored in the fibers. This energy is released when the sharks body snaps back the other way. As energy is alternately stored and released on both sides of the animals body, the tail whips strongly back and forth. This whip-like

13、action propels the animal through the water like a living bullet. Source of EnergyWhat causes the fibers to store so much energy? In finding the answer the Duke University scientists learned that the sharks similarity to a belted radial tire doesnt stop with the skin. Just as a radial tire is inflat

14、ed by pressure, so, too, is the area just under the sharks collagen “radials”. Instead of air pressure, however, the pressure in the shark may be due to the force of the blood pressing on the collagen fibers. When the shark swims slowly, the pressure on the fibers is relatively low. The fibers are m

15、ore relaxed, and the shark is able to bend its body at sharp angles. The animal swims this way when looking around for food or just swimming. However, when the shark detects an important food source, some fantastic involuntary changes take place. The pressure inside the animal may increase by 10 tim

16、es. This pressure change greatly stretches the fibers, enabling much energy to be stored. This energy is then transferred to the tail, and the shark is off. The rest of the story is predictable. Dolphin Has Speed RecordAnother fast marine animal is the dolphin. This seagoing mammal has been clocked

17、at speeds of 32 kilometers (20 miles) an hour. Biologists studying the dolphin have discovered that, like the shark, the animals efficient locomotion can be traced to its skin. A dolphins skin is made up in such a way that it offers very little resistance to the water flowing over it. Normally when

18、a fish or other object moves slowly through the water, the water flows smoothly past the body. This smooth flow is known as laminar flow. However, at faster speeds the water becomes more turbulent along the moving fish. This turbulence muses friction and slows the fish down.In a dolphin the skin is

19、so flexible that it bends and yields to the waviness of the water. The waves, in effect, become tucked into the skins folds. This allows the rest of the water to move smoothly by in a laminar flow. Where other animals would be slowed by turbulent water at rapid speeds, the dolphin can race through t

20、he water at record breaking speeds. Other Animals Less EfficientNot all animals move as efficiently as sharks and dolphins. Perhaps the greatest loser in locomotion efficiency is the slug. The slug, which looks like a snail without a shell, lays down a slimy trail over which it crawls. It uses so mu

21、ch energy producing the slimy mucus and crawling over it that a mouse traveling the same distance uses only one twelfth as much energy. Scientists say that because of the slugs inefficient use of energy, its lifestyle must be restricted. That is, the animals are forced to confine themselves to small

22、 areas for obtaining food and finding proper living conditions. Have humans ever been faced with this kind of problem?1.According to the passage, a shark can use movement to do something except_.Ato find foodBto avoid being chased by its enemiesCto find a new place to liveDto show its braveness2.Exa

23、mples of automobiles, rockets and submarines are used to show that _.Ahumans are the most clever living creatures in the worldBhuman inventions enable us to travel in almost any kind of environmentChumans are very successful in inventing transportation toolsDhumans cant move like other animals in an

24、y circumstances3.What is the key to the sharks swift locomotion in water?AThe skin.BThe tail.CThe muscle.DThe jaw.4.According to the Duke University scientists, when does the shark stretch its collagen fibers to the greatest extent?AWhen moving its tail rapidly.BWhen finding its preys.CWhen staying

25、without any movement.DWhen bending its body in swimming.5.Why is the area just under the sharks collagen fibers similar to a belted radial tire?ABecause it is also full of blood pressure.BBecause it is also filled of air pressure.CBecause it is also inflated by pressure.DBecause it also can be used

26、again and again.6.A laminar flow is formed when a fish swims_.Aslowly through the waterBrapidly through the waterCagainst the currentDat the fastest speed in water7.Consuming the equal amount of energy as a slug does, a mouse can travelas long as it_.Aone twelfth times.Bthe same.C12 times.D1.2 times

27、.8.A shark finds its prey by_. 9.According to the passage, _can be compared to the string of a bow for both of them store energy when stretched.10.When the shark detects an important food source, _take place.Part III Listening Comprehension (35 minutes)Section ADirections: In this section, you will

28、hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices

29、 marked A, B, Cand D, and decide which is the best answer. Then mark the corresponding letter on Answer Sheet 2 with a single line through the centre.11.AHe had finished his work.BHe came back to surprise his wife.CHe came back for lunch.DHe came back to fetch some document.12.AAt a library.BIn a bu

30、s.CAt the airport.DAt a post office.13.ATheres a paper by the door.BThe paper must have blown away.CHe should look further under the desk.DHe can buy another one at the corner.14. A11: 25.B11: 40.C11: 46.D11: 26.15.AThe rent is too high. BHe cant afford the high taxes. CHe doesnt want to live in the

31、 suburbs. DIts too far away from his office.16.ANo. He has to finish his homework. BNo. He doesnt like going to the club. CYes. Hell go after he finishes his homework. DYes. Hell write his paper after he returns.17. AShe lost her way. BShe lost her keys. CShe lost her car. DShe lost her handbag.18.AWorried and frightened. BVery relaxed. CQuite unhappy. DAngry with the professor.Questions 19 to 22 are based on the conversation you have just heard.19. AIn a classroom.BIn a snack bar.CIn the dormitory.DIn a camera shop.20.AThe mans