题目

阅读下列短文，从每题所给的四个选项(A、B、C和D)中选出最佳选项。 Losing weight comes with a lot of health benefits—including making your brain sharper. Yes it turns out that overweight may damage cognitive functions (认知功能) such as memory and attention. There have been few studies of overweight and cognitive functioning, possibly because it is generally believed that it is not a primary risk cause for poor cognitive performance. Losing weight, therefore, may help improve these mental functions, according to a new research led by John Gunstad, assistant professor of psychology at Kent State University. Growing evidence suggests that being fat is linked to cognitive deficits (缺陷). So Gunstad and his team guessed that losing weight might improve mental function. For their study, they measured memory and attention in a group of 150 overweight participants, some of whom had some kind of operation for weight loss and some did not. All of the volunteers completed mental skills tests to assess their abilities of memory and attention at the beginning of the study, and again 12 weeks later. To begin with, about 24% of the patients showed damaged learning and 23% showed signs of poor memory when tested. At the end of the study, those who had lost weight after operation improved their scores into the average or above average range for cognitive functions. Scores for the volunteers who didn't lose weight dropped even further. The study helped Gunstad to find out whether losing weight had any effect on mental function. Now that he's seen the positive effect that weight loss can have on memory and attention, he says he will next study those who choose to lose weight by the traditional way—eating healthier and getting more active. He expects that losing weight in this way will have a similarly positive effect on the brain. "If we can improve the condition with operations, then we can probably produce the same change with behavioral weight loss as well," he says. （1） There is less research on overweight and cognitive functions because researchers ________. A . believe overweight only affects our body B . have focused on ways to sharpen people's mind C . are clear about the relation between weight and mental functions D . do not consider overweight a main cause for low cognitive ability （2） The result of Gunstad's study shows that ________. A . losing weight can improve people's mental functions B . losing weight has little effect on people's memory C . overweight people are likely to have psychology problems D . overweight people's abilities of concentration differ greatly （3） What is Gunstad planning to prove next in his research? A . Slim people are smarter than overweight people. B . Healthy diet is better than exercise in losing weight. C . Overweight people will get smarter by taking more exercise. D . Traditional ways of losing weight are better than operation. （4） Which of the following is the best title for the text? A . Body Weight and Health B . Losing Weight by Operation C . Losing Weight to Sharpen Your Mind D . Ways to Improve Mental Functions 答案： D A C C

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