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1、Unit2Workingtheland李仕才一、阅读理解Inthedeadofwinter,wedon'ttypicallythinkaboutspendingtimeoutdoors,butaccordingtomanyphysiciansweshould.Thesunisourgreatestsourceofavitaminthatisessentialforgoodhealth—VitarninD.Vitamin^）Thisimportantvitaminstrengthensbonesandteethandislinkedtothepreventionofheartdisease,c
2、ancerandmanyother1ife-threateningdiseases.Therecommendeddailyrequirementis400—600InternationalUnits（IU）.Insummer,peoplewithdarkbrowneyesanddarkerskinturnsunlightfromjust15minutcsoutsidewithoutsunscreenintoadequateamountsofVitaminD・Evenduringwinter,justa10・minutewalkatmiddaycankeepthebody"sVitaminDa
3、thealthylevels.Duringbriefwinterwalks,wereceivethegreatestbenefitswhenwewearnosunscreenandexposeasmuchskintothesunaspossible.VitaminDcanbealsoobtainedfromfoods.SalmonisoneofthebestsourcesoftheVitamin・Eggyolks（蛋黄）,cheese,mushroomsandsomeanimalorganscontainsmallerquantitiesofit.Toattractconsumers,foo
4、dcompaniesaddVitaminDtosomeoftheirmilkproducts.ThepracticeofputtingtheVitaminintomilkbeganinthe1930s.Atthattime,manychildrenweresufferingfromrickets,anillnessthatiscausedbyadeficiency（缺乏）ofVitamin0.Ttmadethechildren，sbonessoftandweak・AddingVitaminDtomiIkhelpedtosolvetheproblem,andithasbeenavailable
5、eversince.ForpeoplewhostillneedmoreVitaminD,thereisanotheroption；TakeVitaminDsupplomonts（补充物）•Thoseproductsarewidelysoldinstores.However,anyoneconsideringtakingsupplementsshouldconsultaphysicianfirst.【解题导语】本文是一篇科普文，主要介绍了维生素D的一些情况。1.Duringthewintermonths,people・A・aretabletomeettheirdeadlinesB.oftend
6、on'tdresswarmlyenoughC.generallyliketoremainindoorsD.leavelotsofworkforotherstodoC解析：细节理解题。根据第一段中的"Inthedeadofwinter,wedon,ttypicallythinkaboutspendingtimeoutdoors,butaccordingtomanyphysiciansweshould.”可矢Lh在冬天人们愿意待在室内。1.Accordingtothetext,VitaminD•A.canbeobtainedbybeingexposedtothesunB-canbeusedtoc
7、urelife-threateningdiseasesC.canbemainlyfoundinsomemilkproductsD.canmakethechildren，sbonessoftandweakA解析：细节理解题。根据笫一段笫二句以及笫三段笫一句可知，维生素D可以通过晒太阳获得,故选A。2.Whyissalmonmentionedinthisarticle?A.It"sseldompreparedin
