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Exerciseisoneofthefewfactorswithapositiveroleinlong-termmaintenanceofbodyweight.Unfortunately,thatmessagehasnotgottenthroughtotheaverageAmerican,whowouldrathertryswitchingto“light”beerandlow-caloriebreadthanincreasephysicalexertion.TheCentersforDiseaseControl,forexample,foundthatfewerthanone-fourthofoverweightadultswhoweretryingtoshedpoundssaidtheywerecombiningexercisewiththeirdiet.Inrejectingexercise,somepeoplemaybediscouragedtoomuchbycaloric-expenditurecharts:forexample,onewouldhavetobrisklywalkthreemilesjusttoworkoffthe275caloriesinonedeliciousDanishpastry.Evenexerciseprofessionalsconcedehalfapointhere.“Exercisebyitselfisaverytoughwaytoloseweight,”saysYorkOnnen,programdirectorofthePresident’sCouncilonPhysicalFitnessandSports.Still,exercise’ssupportingroleinweightreductionisvital.AstudyattheBostonUniversityMedicalCenterofoverweightpoliceofficersandotherpublicemployeesconfirmedthatthosewhodietedwithoutexerciseregainedalmostalltheiroldweight,whilethosewhoworkedexerciseintotheirdailyroutinemaintainedtheirnewweight.Ifyouhavebeensedentaryanddecidetostartwalkingonemileaday,theaddedexercisecouldburnanextra100caloriesdaily.Inayear’stime,assumingnoincreaseinfoodintake,youcouldlosetenpounds.Byincreasingthedistanceofyourwalksgraduallyandmakingotherdietaryadjustments,youmayloseevenmoreweight.10.Whatistheauthor’spurposeinwritingthisarticle?

题型：单选题

选项

A. To justify the study of the Boston University Medical Center.

B. To stress the importance of maintaining proper weight.

C. To support the statement made by York Onnen.

D. To show the most effective way to lose weight.

正确答案：