2005年6月大学英语六级考试真题及答案

概要： light is on. That’s why nobody has ever separated the real effects of light therapy from placebo(安慰剂) effects. Until now. In three separate studies published last month, researchers report not only that light therapy works better than a placebo but that treatment is usually more effective in the early morning than in the evening. In two of the groups, the placebo problem was resolved by telling patients they were comparing light boxes to a new anti-depressant device that emits negatively charged ions(离子). The third used the timing of light the

2005年6月大学英语六级考试真题及答案,http://www.dxs51.com
 Krentz is not alone. Scientists estimate that 10 million Americans suffer from seasonal depression and 25 million more develop milder versions. But there’s never been definitive proof that treatment with very bright lights makes a difference. After all, it’s hard to do a double-blind test when the subjects can see for themselves whether or not the light is on. That’s why nobody has ever separated the real effects of light therapy from placebo(安慰剂) effects.
 Until now. In three separate studies published last month, researchers report not only that light therapy works better than a placebo but that treatment is usually more effective in the early morning than in the evening. In two of the groups, the placebo problem was resolved by telling patients they were comparing light boxes to a new anti-depressant device that emits negatively charged ions(离子). The third used the timing of light therapy as the control.
 Why does light therapy work? No one really knows. “Our research suggests it has something to do with shifting the body’s internal clock,” says psychiatrist Dr. Lewey. The body is programmed to start the day with sunrise, he explains, and this gets later as the days get shorter. But why such subtle shifts make some people depressed and not others is a mystery.
 That hasn’t stopped thousands of winter depressives from trying to heal themselves. Light boxes for that purpose are available without a doctor’s prescription. That bothers psychologist Michael Terman of Columbia University. He is worried that the boxes may be tried by patients who suffer from mental illness that can’t be treated with light. Terman has developed a questionnaire to help determine whether expert care is needed.
 In any event, you should choose a reputable manufacturer. Whatever product you use should emit only visible light, because ultraviolet light damages the eyes. If you are photosensitive(对光敏感的), you may develop a rash. Otherwise, the main drawback is having to sit in front of the light for 30 to 60 minutes in the morning. That’s an inconvenience many winter depressives can live with.
 26. What is the probable cause of Krentz’s problem?
 A) An unexpected gain in body weight.
 B) Unexplained impairment of her nervous system.
 C) Weakening of her eyesight with the setting in of winter.
 D) Poor adjustment of her body clock to seasonal changes.
  
 27. By saying that Linda Krentz “saw the light”(Line 4, Para. 1), the author means that she “         ”.
 A) learned how to lose weight
 B) realized what her problem was
 C) came to see the importance of light
 D) became light-hearted and cheerful
  
 28. What is the CURRENT view concerning the treatment of seasonal depression with bright lights?
 A) Its effect remains to be seen.
 B) It serves as a kind of placebo.
 C) It proves to be an effective therapy.
 D) It hardly produces any effects.
  
 29. What is psychologist Michael Terman’s major concern?
 A) Winter depressives will be addicted to using light boxes.
 B) No mental patients would bother to consult psychiatrists.
 C) Inferior light boxes will emit harmful ultraviolet lights.
 D) Light therapy could be misused by certain mental patients.
  
 30. Which of the following statements is TRUE?
 A) Winter depressives prefer light therapy in spite of its inconvenience.
 B) Light therapy increases the patient’s photosensitivity.
 C) Eye damage is a side effect of light therapy.
 D) Light boxes can be programmed to correspond to shifts in the body clock.
Part Ⅲ Vocabulary (20 minutes)
 Directions: There are 30 incomplete sentences in this part. For each sentence there are four choices marked A), B), C) and D). Choose the NOE answer that best completes the sentence. Then mark the corresponding letter on the Answer Sheet with a single line through the centre.
 31. Susan has       the elbows of her son’s jacket with leather patches to make it more durable.
 A) reinforced                            B) sustained
 C) steadied                              D) confirmed
 32. Although we tried to concentrate on the lecture, we were         by the noise form the next room.
 A) distracted                             B) displaced

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