题目内容：
根据以下材料，回答题Mr.Smithwasawealthyindustrialist,buthewasnotsatisfiedwithlife.Hedidnotsleepwellandhisfooddidnotagreewithhim.Thissituationlastedforsometime.Finally,afterseveralsleeplessnights,hedecidedtoconsulthisdoctor.Thedoctoradvisedachangeofsurroundings."Goabroad,"hesaid."ButI'mnotgoodatforeignlanguage,"saidMr.Smith."Itdoesn'tmatter,"saidthedoctor."Itwon'thurtyoutotalkalittleless.Goonavoyage.Takeplentyofexercise.Trytoreduceyourweight.Avoidrichfood."
Mr.SmithwenttoSwitzerland.HedidnotknowFrenchorGerman,andhadtocommunicatethroughgestures.Heattendedaphysicaltrainingcourse.Theinstructormadehimbendhisknees,swinghisarms,stretchhisneckandshakehisheadrapidly.Hehadtolieonthegroundandraisehisrightandleftlegsaltemately.Afteratimehismusclesgrewhardandfirm.Heforgotthefinancialcrisisandtheimportanceofraisingthelevelofproduction.Heevenbegantonoticeindividualtreesandindividualbirds.
Finallyhereturnedhome.Butunfortunatelyhisimprovementwasonlytemporary.Soonhewasanormalbusinessmanagain,worriedabouthisproperty,hisprofits,hissavings,hisadvancementinatechnologicalsociety,andthingsingeneral.
Mr.Smithwenttoseehisdoctorbecausehe-. A．hadlittletoeat
B．wasseriouslyill
C．hadtosleep
D．didn'tfeelwell
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答案解析：