If you want to stay young,sit down and have a good think.This is the research finding of a team of Japanese doctors,who say that most of our brains are not getting enough exercise - and as a result,we are ageing unnecessarily soon.Professor Talju Matsuzawa wanted to find out why otherwise healthy farmers in northern Japan appeared to be losing thelr ability to think and reason at a relatively early age,and how the process of ageing could be slowed down.With a team of colleagues at Tokyo National Unlversity,he set about measuring brain volumes of a thousand people of different ages and varying occupations.Computer technology enabled the researchers to obtain precise measurements of the volume of the front and side sections of the brain,which relate to intellect(WU) and emotion,and determine the human character.(The rear section of the brain,which controls functions like eating and breathing does not contract with age ,and one can continue living without intellectual on emotional faculties or functions).Contraction of front and side parts - as celis die off- was observed in some subjects in thelr thirties,but it was still not evident in some sixty and seventy-year-olds.Matsuzaswa concluded from his tests that there is a simple remedy to the contraction normally associated with age-using the head.The findings show in general terms that contraction of the brain begins sooner in people in the country than in the towns.Those least at risk,soys Matsuzawa are lawyers,followed by university professors and doctors.White collar workers doing routine work in government offices are however,as llkely to have shrinking brains as the farm workers,bus drivers and shop assistants.Matsozawa' s findings show that thinking can prevent the brain form shrinking.Blood must circulate properly in the head to supple the fresh oxygen the brain cells need."The best way to maintain good blood circulation is through using the brain," he says."Think hard and engage in conversation.Don" t rely on pocketcalculators."1.The team of doctors wanted to find out（）.A.which people are most itelligentB.the size of certain people's brainsC.how to make people live longerD.why certain people are sooner than others2.On what are their research findings based?（）A.The latest development of computer technology.B.Study of brain volumes of different people.C.Tests performed on a thousand old people.D.A survey of farmers in northern Japan.gn2.3.The doctor' s tests show that（）.A.our brains shrink as we grow olderB.some people' s brains have contracted more than other people' sC.the front section of the brain does not shrinkD.sixty-year-olds have better brains than thirty-year-olds4.The word "subjects" in paragraph 5 means（）.A.any member of a state except the supreme rulerB.something to be consideredC.branches of knowledge studiedD.persons chosen to be studied in an experiment5.According to the passage, which people seem to age slower than the others?（）A.Shop astants.B.Clerks.C.Farmers.D.Lawyers.