2019高考英语一轮基础自练题 Unit 5 Theme parks（含解析）新人教版必修4

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1、Unit5Themeparks***阅读理解。Inthedeadofwinter，wedon'ttypicallythinkaboutspendingtimeoutdoors，butaccordingtomanyphysiciansweshould.Thesunisourgreatestsourceofavitaminthatisessentialforgoodhealth—VitaminD.Thisimportantvitaminstrengthensbonesandteethandislinkedtothepreventionofhe

2、artdisease，cancerandmanyotherlifethreateningdiseases.Theremendeddailyrequirementis400600InternationalUnits(IU)．Insummer，peoplewithdarkbrowneyesanddarkerskinturnsunlightfromjust15minutesoutsidewithoutsunscreenintoadequateamountsofVitaminD.Evenduringwinter，justa10minutewalk

3、atmiddaycankeepthebody'sVitaminDathealthylevels.Duringbriefwinterwalks，wereceivethegreatestbenefitswhenwewearnosunscreenandexposeasmuchskintothesunaspossible.VitaminDcanbealsoobtainedfromfoods.SalmonisoneofthebestsourcesoftheVitamin.Eggyolks(蛋黄)，cheese，mushroomsandsomeani

4、malorganscontainsmallerquantitiesofit.Toattractconsumers，foodpaniesaddVitaminDtosomeoftheirmilkproducts.ThepracticeofputtingtheVitaminintomilkbeganinthe1930s.Atthattime，manychildrenweresufferingfromrickets，anillnessthatiscausedbyadeficiency(缺乏)ofVitaminD．Itmadethechildren

5、'sbonessoftandweak.AddingVitaminDtomilkhelpedtosolvetheproblem，andithasbeenavailableeversince.ForpeoplewhostillneedmoreVitaminD，thereisanotheroption：TakeVitaminDsupplements(补充物)．Theseproductsarewidelysoldinstores.However，anyoneconsideringtakingsupplementsshouldconsultaphy

6、sicianfirst.1．Duringthewintermonths，people________.A．aren'tabletomeettheirdeadlinesB．oftendon'tdresswarmlyenoughC．generallyliketoremainindoorsD．leavelotsofworkforotherstodo2．Accordingtothetext，VitaminD________.A．canbeobtainedbybeingexposedtothesunB．canbeusedtocurelifethre

7、ateningdiseasesC．canbemainlyfoundinsomemilkproductsD．canmakethechildren'sbonessoftandweak3．Whyissalmonmentionedinthisarticle?A．It'sseldompreparedinthecorrectway.B．It'sausefuladditiontoaperson'sdiet.C．Ithasahugeimpactontheenvironment.D．Itsadvantageshavebeenexaggerated.4．Th

8、emainpurposeofthisarticleis________.A．tointroduceavaluablenutrientB．toadvertiseVitaminDsupplemen