It is no wonder this type of chair has remained so popular.Even today,furniture designers are still trying to create equally successful designs.

　　Ⅱ.阅读理解【科普知识类】

　　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抰 lose weight dropped even further.d

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