题目内容：
回答题：EffectsofExerciseonElderlyDiabetics（糖尿病人）
Mostolderpeoplewithso-calledtypeIIdiabetes（糖尿病）couldstoptakinginsulin（胰岛素）iftheywoulddobriskexercisefor30minutesjusttheretimesaweek,accordingtonewmedicalresearchresultsreportedinaCopenhagennewspaper,ResultsfromtestsconductedondiabeticsattheCopenhagencentralhospitalRigshospitalet’sCenterforMuscleResearchshowedthatphysicalexercisecanboostthebody’sabilitytomakeuseofinsulinby30percent.Thisisequaltotheeffectmostelderlydiabeticsgetfromtheirinsulinmedication（药物治疗）today.
Researchershadagroupofnon-diabeticmenandagroupofmenwithtypeIIdiabetes,allmorethan60yearsofage,exerciseonbicyclessixtimesaweekforthreemonths.Afterthethreemonthsthedoctorsmeasuredhowmuchsugarthetestsubjects’musclescouldmakeuseofasameasureforhowwelltheirinsulinworked.
AssociateProfessorDrFlemmingDelaoftheMuscleResearchCentersaidthetestsdemonstratedthattheexercisingdiabeticshadmadeasgooduseofinsulinasthehealthynon-diabeticpersons.“Thismeansthattheinsulinworksjustaswellforbothgroup.Physicalexercisecannotcurepeopleofdiabetes,butitcaneliminatealmostalltheirsymptoms.Atthesametimeitcanputoffthepointatwhichtheyhavetobegintakinginsulin,”Delasaid.
Insulinisahormoneproducedbythepancreas（胰腺）,controllingsugarinthebodyandisusedagainstdiabetes.
Delasaidthattoachievethedesiredeffectdiabeticsneedonlyexercisetothepointwhere they begin to work up7 a sweat, but that the activity has to be maintained since it wears off8 after five days without sufficient exercise．
Most diabetics realise that they have to watch their diet while remaining unaware of the importance of exercise, Dela added．
How could most elderly type II diabetics stop taking insulin?
A．By taking more salt than usual．
B．By taking less salt than usual．
C．By doing brisk exercise for half an hour at least three times a week．
D．By going climbin9，swimming or boxing every day．
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