大学英语六级模拟题三及答案.doc

大学英语六级模拟题三及答案Part Listening Comprehension(20 minutes) SectionADirections: In this section, you will hear 10 short conversations. At the end of each conversation, a question will be asked about what was said. Both the conversation and the question will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A), B), C) and D), and decide which is the best answer. Then mark the corresponding letter on the Answer Sheet with a single line through the center.Example:You will hear: M: When shall we start our work, Jane?W: Tomorrow at 9 oclock. But we must work quickly, for we have to finish everything before 2 in the afternoon.Q: For how long can they work?You will read:A) 2 hours.B) 3 hours.C) 4 hours.D) 5 hours.From the conversation we know that the two are talking about some work they will start at 9 oclock in the morning and have to finish at 2 in the afternoon. Therefore, D)5 hours is the correct answer. You should choose D on the Answer Sheet and mark it with a single line through the center.Sample Answer A BC CD2KG-1*4/5D1. A) Buy something in the Bill supermarket.B) Get money to pay her bill.C) Check to see whether he can pay in cash.D) Get a check for the woman. 2. A) At class.B) Back at home.C) At work.D) In hospital.3. A) She will help him.B) She finished hers two days ago.C) She completed her work very quickly.D) She is still doing the project.4. A) Angry.B) Hungry.C) Tired.D) Dissatisfied.5. A) It is not theirs.B) It has some problems.C) It is out of warranty.D) It was stolen.6. A) She doesnt like picnic.B) It will be too hot.C) She will have an exam next week.D) The biology class will go to the beach next week.7. A) It does not concern John.B) John does not care about his car.C) John will help him fix the car.D) He wants John to fix the car.8. A) 20 miles.B) 6 miles.C) 14 miles.D) 26 miles.9. A) Its time to urge him to study math.B) He himself should make the decision.C) They should help him study math.D) They should leave right now.10.A) It has been published.B) It has been thrown out as junk.C) It has been deleted from the computer.D) The woman cannot get it any longer.SectionBPassage OneQuestions 11 to 13 are based on the following passage:11.A) Soil. B) Human population.C) Forest.D) Water. 12.A) By using satellite images, maps, etc.B) By studying specific farming methods. C) By studying the variation of human population. D) By analyzing the quality of crops. 13.A) By forcing them farming. B) By affecting the quality of soils. C) By adding chemicals and pollute the waterways. D) By affecting the environments they live in. Passage TwoQuestions 14 to 16 are based on the following passage:14.A) To estimate the extreme weather.B) To develop the satellite technology. C) To improve agricultural output. D) To learn how to change information to maps more efficiently. 15.A) By turning the intensity of sunshine into maps.B) By analyzing the recent weather report. C) By capturing the microwave radiation from the soil. D) By analyzing information provided by ground observation centers. 16.A) Acquire information from satellites more efficiently.B) To realize full coverage of area the satellite passes over. C) Building more ground observation centers. D) Compare satellites information with those from ground. Passage ThreeQuestions 17 to 20 are based on the following passage:17.A) Call on people to protect sharks. B) Point out the living environment of sharks. C) Explain why the sharks are dangerous. D) An introduction to sharks. 18.A)By good sense of water waves made by quarries. B)By good sense of smell and electrical magnetic power. C)By good sense of light. D)By good sense of blood. 19.A) Bone structure. B) Smell ability. C) Birth mode. D) Recover ability against disease. 20.A) Their tasty meat. B) The principle of their defense system against disease. C) Their solid skin. D) The principle of their birth modes.Part Reading Comprehension(35 minutes) Passage OneQuestions 21 to 25 are based on the following passage: Scientists say there has been a severe decrease in the amount of water in Lake Chad in northern Africa in the last thirty years. They report that nature and humans share equal blame for this loss. In 1963 the fresh water lake covered twenty-five-thousand-square kilometers.Now the lake is only about five percent of that size.It measures only about one-thousand-three-hundred square kilometers in the dry season. Four nations surround Lake Chad. People in Niger, Nigeria, Chad, and Cameroon use it for water, fish and plant life. Michael Coe and Jonathan Foley are water experts at the University of Wisconsin in Madison.They reported about Lake Chad in the Journal of Geophysical Research.They say the area has suffered from a lack of heavy rain for more than thirty years.This has forced people to build systems to carry water to dry land.These irrigation systems further decrease the lake. Mister Coe says Lake Chad will be only a small body of water in the future. He says people still can get water from the lake to drink and for crops. But he says the lake will no longer provide a healthy environment for fish and plant life. The researchers used a computer to study what caused the water loss. Their computer study estimated the climate and amount of water in the area. The estimate started with the early 1960s. Then the researchers compared the estimates with the areas recorded climate and water supply for the same period. The computer study showed results similar to the recorded ones for the first twenty years. But there was a big change in the 1980s. At that time, the lake got smaller much faster than the computer research had estimated. The researchers say major irrigation systems were built in the 1980s. The systems took water from two rivers that flow into Lake Chad. The Chari and Logone rivers carry most of the water that enters the lake. The study showed the increased irrigation reduced the flow in the two rivers. Climate changes also were responsible for the reduction. Today the flow of the two rivers has been reduced by almost seventy-five percent. Scientists say the problem is expected to worsen in the coming years as the population and demand for water continue to increase. 21.What is this passage mainly about?A) Demonstrating the serious weather condition around Lake Chad. B) Introducing peoples activity around Lake Chad.C) Analyzing of the factors that cause water decreases in Lake Chad.D) Introducing scientists work about water condition in Lake Chad.22.What did people do to solve the problem of rain lack around Chad Lake?A) They moved out of this area.B) They drew water from Lake Chad.C) They carried water from other areas.D) They utilize seawater near this area.23.Which of the following is true according to this passage?A) Chad Lake located in the middle of Chad in northern Africa.B) The water from Chad water can now only be used for irrigation.C) The area around Chad Lake has suffered from heavy rain lack many decades.D) Population around the Chad Lake now begins to decrease due to water lack.24.Why computer data become imprecise in 1980s? A) The related programs on the computer were out of date. B) More and more people drew water directly from the lake for drink. C) A heavy rain happened around 1980. D) The irrigation from the source water increases.25. What is scientists attitude towards the future of Chad Lake?A) Pessimism.B) Hopeful. C) Indifferent. D) Doubtful.Passage TwoQuestions 26 to 30 are based on the following passage: Scientists have long believed one way to stop the Earths atmosphere from warming is by planting more trees.The idea is that more trees will take in or absorb some of the carbon dioxide in the atmosphere.Carbon dioxide is a gas released by cars,factories and other human activities.The gas traps heat in the Earths atmosphere,which warms the planet.However,two new studies have found that trees may not be as helpful in reducing carbon dioxide as had been thought. The first study was done at Duke University in Durham, North Carolina. Researchers pumped extra carbon dioxide into a test area where pine trees were growing. The trees grew thirty-four percent faster during the first three years. However, in time, the trees slowed to about their normal growth rate. The scientists say this is because trees need other nutrients, such as nitrogen. In the second study, researchers from Duke and Bowdoin College in Brunswick, Maine examined the soil around trees. They discovered that as the leaves broke down into the soil, all the carbon was not trapped in the soil. Much of it was released into the atmosphere as carbon dioxide. The findings of the two studies were published last month in Nature magazine. They suggest there is limited value in planting trees to reduce the carbon dioxide pollution in the atmosphere. Forest planting has been a part of negotiations on a world agreement to reduce greenhouse gases that scientists believe cause global warming. The United States, Canada, Japan and some other industrial countries have supported the idea. But this new research suggests the idea is not as effective as environmental activists had thought. Scientist Ram Oren of Duke University led the study on tree growth. He says that earlier estimates on the ability of forests to absorb carbon dioxide were overly hopeful. Some scientists not involved in the studies say the research provides some of the first evidence on how trees react to carbon dioxide. Other scientists say the research disputes a belief among some coal and power companies. The companies say that rising levels of carbon dioxide in the atmosphere will not create harmful global warming. Instead, they say it will increase forests and other plants.26.What is the purpose of this passage?A) Introduce some new ideas about the relationship between trees and carbon dioxide.B) Introduce recent condition of global industrial pollution.C) Call on people to plant more trees to reduce greenhouse gases.D) Point out that power companies should be responsible for the rising levels of carbon dioxide.27. Why researchers put trees in extra carbon dioxide in the first study?A) To learn whether trees can still absorb carbon dioxide under extreme conditions.B) To get more oxygen from these trees.C) To evaluate the maximum carbon dioxide that trees can absorb.D) To see the growth rate of these trees.28.What happened to the leaves falling from the trees in the second study?A)They broke down and the main parts turned into oxygen.B)They broke down and the carbon content had mainly turned into carbon dioxide.C)They broke down and the carbon content was mainly absorbed in the soil.D)They absorbed more carbon dioxide.29.Scientist Ram Oren is of the opinion that common beliefs of the trees ability to absorb carbon dioxide are_.A) biased B) insightfulC) overoptimistic D) totally wrong30.The word it (Line 7, Para.6) probably refers to _.A) carbon dioxideB) nitrogenC) atmosphereD) coalPassage ThreeQuestions 31 to 35 are based on the following passage:An American scientist has found that many images of dinosaurs may be wrong. For years, pictures of the ancient creatures have shown their nose openings near the top of the head. The new study suggests the dinosaurs nostrils were just above the mouth.Dinosaurs used t