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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.　9.WhatwasconfirmedbytheBostonUniversityMedicalCenter’sstudy?

题型：单选题

选项

A. Controlling one’s calorie intake is more important than doing exercise.

B. Even occasional exercise can help reduce weight.

C. Weight reduction is impossible without exercise.

D. One could lose ten pounds in a year’s time if there’s no increase in food intake.

正确答案：C