[外语类试卷]大学英语六级模拟试卷426及答案与解析.doc

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1、大学英语六级模拟试卷 426及答案与解析 一、 Part I Writing (30 minutes) 1 Directions: For this part, you are allowed 30 minutes to write a short essay entitled Foreign Travelers in China Will Increase after Beijing Olympic Games. You should write at least 150 words following the outline given below. 1. 北京奥运会的成功举办对中国的影响

2、 2奥运会后中国的发展尤其是外国人来华旅游热的发展 3分析来华旅游热发展的原因 Foreign Travelers in China Will Increase after Beijing Olympic Games 二、 Part 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 attached to th

3、e passage. For questions 1-4, mark： Y (for YES) if the statement agrees with the information given in the passage; N (for NO) if the statement contradicts the information given in the passage; NG (for NOT GIVEN) if the information is not given in the passage. 1 Part Reading Comprehension (Skimming a

4、nd Scanning) 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 ). For questions 8-10, complete the sentences with the information given

5、 in the passage. How to Solve Three Puzzles New knowledge and sophisticated diagnostic techniques are helping doctors recognize early signs of autism (孤独症 ), Alzheimers disease(痴呆症 ) and heart problems in women. Harvard experts report on the advances that are giving patients hope. Detecting Autism E

6、arly diagnosis (诊断 )of autism is critical because educational programs that build upon a childs strengths and improve social skills may help sculpt the developing brain, minimizing the impact of the illness later in life. But spotting the disorder is hard since there is no test for it, although scie

7、ntists are slowly uncovering gene abnormalities that make children vulnerable to autism. Last week The New England Journal of Medicine reported that a specific location on chromosome(染色体 ) 16 was the site of mutations responsible for so me cases of autism. For now, diagnosis depends on observing a c

8、hilds behavior. Its a complex process, since no two cases are alike and signs range from mild to severe, landed, even though signs of autism may be apparent before their first birthday, most children arent diagnosed until the age of 3. That makes parents, who are so intimately familiar with their ch

9、ilds behavior, perhaps the most effective diagnostic” tools. “The American Academy of Pediatrics recently issued screening guidelines recommending that pediatricians engage parents in evaluating infants for autism. Even babies developing typically, the guidelines say, should be screened at set inter

10、vals, such as during the 9-, 18- and 24-month visits. Healthy infants as young as 6 or 8 months do communicate and respond nonverbally to social cues. Most lo ok up or turn at the sound of their name. By 12 months they typically babble and point at objects. By 16 months they say single words; by 24

11、months, two-word phrases. In contrast, children with autism seldom make meaningful eye contact or respond to familiar voices. They may never speak. Their play is often repetitive and characterized by limited imagination (neatly arranging crayons instead of coloring with them). Others may simply flap

12、 their hands in excitement or disappointment. On their own, none of these signs means that a child has autism or another developmental disorder. Nevertheless, if your child has any of these signs, he or she merits evaluation. Although no treatments are curative, they can help children learn the skil

13、ls they need to cope in a normal environment, achieve greater independence and have brighter futures. The Alzheimers Mystery Alzheimers disease, which begins years, even decades, before it causes symptoms, is a quietly ticking time bomb. But until recently doctors had no diagnostic test that could “

14、hear“ the ticking. Unfortunately, it didnt matter much that Alzheimers couldnt be spotted early at a stage called mild cognitive impairment, or MCI-since there were no treatments. Today, however, there are new diagnostic tests that can detect Alzheimers at an early stage, and several disease-modifyi

15、ng drugs are in advanced clinical trials. The brain shrinkage(萎缩 ) caused by Alzheimers can now be measured with volumetric magnetic resonance imaging (MR1). This technique takes a series of MRI brain scans and then uses sophisticated mathematical models to analyze the results. Most important, volum

16、etric MRI enables researchers to identify subtle shrinkage in bra in areas first affected by Alzheimers, such as the hippocampus, which is involved in memory. Another technology in limited clinical use is fluoro-deoxy-glucose positron emission tomography (FDG PET). Images produced by FDG-PET reveal

17、patterns of glucose metabolism (葡萄糖新陈代谢 )in the cerebral cortex, the site of abstract thought, reasoning and learning. Because active neurons guzzle glucose for energy, diminished uptake in a specific pattern can denote Alzheimers. In the research setting, scientists have even used FDG-PET to identi

18、fy people who do not yet have Alzheimers but are at risk for developing it, or f or developing mild cognitive impairment. A different kind of PET-scan technology builds on recent discoveries about amyloidal plaques and tau tangles, the neuron-killing proteins that accumulate in the brains of Alzheim

19、ers patients. Researchers at the University of Pittsburgh have developed Pittsburgh Compound-B, or PIB. When injected into the blood, this com pound binds to amyloid plaques in the brain, allowing them to be detected on PET scans. PET scans with PIB clearly distinguish people with Alzheimers from he

20、althy people. They may also help identify people with the progressive form of MCI. Taking a different approach, other researchers are identifying early changes in the levels of particular bring proteins in cerebrospinal fluid. (The clear spinal fluid constantly bathes the brain and spinal cord.) Spi

21、nal-fluid levels of the protein tau are typically elevated in Alzheimers, and an altered version of the tau protein, known as phosphorylated tau, can be detected early in Alzheimers. Lowered spinal-fluid concentrations of an altered version of beta-amyloid, called AB42, are typical in Alzheimers and

22、 can also help identify people with mild cognitive impairment who are most likely to progress to Alzheimers. Although all these new imaging and biochemical developments are individually promising, the combine ion of several different imaging tests and biochemical markers may yield the most accurate

23、diagnosis. For example, scientists at the New York University School of Medicine have reported that combining volumetric MRI of the hippocampus with spinal-fluid measures of phosphorylated tau and isoprostane a marker of oxidative stress-improved diagnostic accuracy in identifying people with mild c

24、ognitive impairment who are most likely to progress to Alzheimers. Heart Disease in Women When it comes to diagnosing the most common kind of heart disease, some cardiologists share Henry Higginss lament in “My Fair Lady“: “Why cant a woman be more like a man? Thats because many women dont have the

25、typical symptoms, like crushing chest pain and shortness of breath brought on by physical activity or stress. Instead, they have diffuse discomfort in the chest, unusual exhaustion or depression without an apparent reason. To make matters worse, the tests considered best at diagnosing coronary-arter

26、y disease generally dont work as well for women as they do for men. As a result, an alarming number of women with heart disease go undiagnosed and untreated despite repeated visits to the doctor and the emergency room. Blood flows to heart muscle first through large arteries (the coronary arteries)

27、and then through a branching network of smaller blood vessels. The symptoms of heart disease, in men or women, often result from cholesterol-filled plaques that can slow and completely block the flow of blood to the heart muscle. This type of heart disease, which has been recognized for a century, c

28、an be seen with tests such as coronary angiograms (or arteriogram) and, less well, with noninvasive tests such as special CT and MRI scans. In just the past decade, researchers have learned that many women with chest pain and other symptoms of heart disease have a condition called coronary microvasc

29、ular disease, which affects the hearts smallest arteries. This fundamentally different form of heart disease is as common and as costly as all female-specific cancers com bind, affecting as many as 3 million American women. It affects men, too, but not nearly as often. Many doctors have not yet hear

30、d about coronary micro-vascular disease. Currently, the most definitive test involves measuring coronary-artery flow reserve or coronary reactivity. It involves threading an ultra thin wire with blood-flow sensors at the tip deep into a coronary artery. Blood flow in the artery is then measured be f

31、ore and after injections of one or more medications that should cause the micro-vessels to dilate. An alternative, noninvasive way of detecting micro-vascular disease is with cardiac MRI. This scan measures the amount of blood fl owing into the heart muscle before and after the heart is infused with

32、 a drug that dilates the micro-vessels. As with the coronary-reactivity test, if blood flow does not increase, there is disease of the micro-vessels. If you are a woman with recurrent chest pain or discomfort, shortness of breath, unexplainable exhaustion and depression, you may need special evaluat

33、ion even if you have clear arteries on an angiogram. If your doctor says theres nothing wrong, ask for a second opinion at one of a growing number of womens cardio vascular-care centers. You may have coronary micro-vascular disease. 2 According to the passage, heart problems nowadays are medical dif

34、ficulties, especially when they occur in _. （ A） men （ B） women （ C） the young （ D） the old 3 Why is it so hard to diagnose the autism? （ A） Because there still exists no test for diagnosis by now. （ B） Because diagnosis of the same autism cases are different. （ C） Because scientists make no progres

35、s in uncovering the genetic factors. （ D） Because none of the signs of autism is obvious to be diagnosed. 4 How old are those babies without autism when they start to say single words? （ A） By 6 or 8 months. （ B） By 12 months. （ C） By 16 months. （ D） By 24 months. 5 The brain shrinkage caused by Alz

36、heimer can now be measured with_. （ A） the hippocampus （ B） brain scans （ C） mathematical models to analyze the results （ D） volumetric magnetic resonance imaging 6 Those images produced by FDG-PET can reveal_. （ A） the number of glucose metabolism （ B） the size of glucose metabolism （ C） the patter

37、n of glucose metabolism （ D） the distribution of glucose metabolism 7 The report of the New York University School of Medicine has proved that the most efficient technol ogy for diagnosing Alzheimer is_. （ A） the combination of different technologies （ B） FDG-PET technology （ C） PIB technology （ D）

38、MR1 technology 8 Why are there an alarming number of women with heart disease who go undiagnosed? （ A） Because many women dont visit the doctor even if they have some heart problems. （ B） Because many women dont have the typical symptoms like men for diagnosis. （ C） Because there is no scientific te

39、st for heart problems. （ D） Because women are unwilling to make their heart problems known. 9 The symptoms of heart disease, in men or women, are often caused by_. 10 Besides the way of threading an ultra thin wire with blood-flow sensors, another noninvasive way of detecting micro-vascular disease

40、is to use_. 11 A woman needs special evaluation if she has some symptoms, such as recurrent chest pain and unexplained able_. Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked abou

41、t 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 marked A, B, C and D, and decide which is the best answer. （ A） The mountains. （ B） The seaside. （ C） The park. （ D） The fore

42、st. （ A） She wouldnt mind doing it if she could. （ B） She wished she hadnt had the meeting. （ C） She didnt want to because she would rather go to Chicago. （ D） would be able to have the meeting. （ A） She missed her friends. （ B） She thinks shes catching another cold. （ C） She likes tomato sauce on e

43、verything she eats. （ D） has a lot of work to make up. （ A） In a bookstore. （ B） In a library. （ C） Ina classroom. （ D） In a hotel. （ A） She disagrees with the man. （ B） She doesnt agree with Cynthia. （ C） She thinks its narrow-minded. （ D） She doesnt believe either of them. （ A） He prefers shorter

44、plays to this one. （ B） He doesnt have to go to that play. （ C） He wouldnt see the play as the woman did. （ D） He liked the play better the first time he saw it. （ A） The casher of the hotel. （ B） The receptionist at the front desk. （ C） The hotel operator. （ D） The Bell Telephone operator. （ A） Bec

45、ause they are alike. （ B） Because the mans briefcase has a lock. （ C） Because the mans briefcase is smaller. （ D） Because she doesnt have a briefcase. （ A） 20 years ago. （ B） 25 years ago. （ C） When Shakespeare was there. （ D） When the restaurant newly opened. （ A） In the corner near the band. （ B）

46、In the corner by the window. （ C） At the table near the bank. （ D） In a dark room. （ A） A green dress. （ B） A dark red dress. （ C） A long brown robe. （ D） A bright golden dress. （ A） To watch TV. （ B） To write some essays. （ C） To listen to music. （ D） To read a book. （ A） His neighbors are too nois

47、y. （ B） He doesnt want to share a room with others. （ C） He is house is too far away from the university. （ D） Its not convenient to go shopping. （ A） Think. （ B） Sit down. （ C） Talk with his classmates. （ D） Wander around. （ A） Radio Times. （ B） A local paper. （ C） Sunday Times. （ D） TV Times. Sect

48、ion B Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D. （ A） Becaus

49、e he believes in motivating his team as individuals. （ B） Because he wants to keep his team under pressure. （ C） Because he feels it awkward to give them talks. （ D） Because he thinks his team should have the character to fight back. （ A） His not interfering during a game. （ B） His making constant substitutions. （ C） His giving people autonomy. （ D） His dropping players from the team without explanation. （ A） His competence. （ B） His motivation. （ C） His attitude. （ D） His experienc