高考英语一轮精选练unit5canada–“thetruenorth”习题新人教版必修3

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1、Unit5Canada–“TheTrueNorth”李仕才一、阅读理解。(2018·辽宁五校联考)Inthedeadofwinter，wedon’ttypicallythinkaboutspendingtimeoutdoors，butaccordingtomanyphysiciansweshould.Thesunisourgreatestsourceofavitaminthatisessentialforgoodhealth—VitaminD．Thisimportantvitaminstrengthensbonesandteethandislinkedtotheprevention

2、ofheartdisease，cancerandmanyotherlifethreateningdiseases.Therecommendeddailyrequirementis400－600InternationalUnits(IU).Insummer,peoplewithdarkbrowneyesanddarkerskinturnsunlightfromjust15minutesoutsidewithoutsunscreenintoadequateamountsofVitaminD．Evenduringwinter,justa10minutewalkatmiddaycankee

3、pthebody’sVitaminDathealthylevels.Duringbriefwinterwalks，wereceivethegreatestbenefitswhenwewearnosunscreenandexposeasmuchskintothesunaspossible.VitaminDcanbealsoobtainedfromfoods.SalmonisoneofthebestsourcesoftheVitamin.Eggyolks(蛋黄)，cheese，mushroomsandsomeanimalorganscontainsmallerquantitiesofi

4、t.Toattractconsumers，foodcompaniesaddVitaminDtosomeoftheirmilkproducts.ThepracticeofputtingtheVitaminintomilkbeganinthe1930s.Atthattime，manychildrenweresufferingfromrickets，anillnessthatiscausedbyadeficiency(缺乏)ofVitaminD．Itmadethechildren’sbonessoftandweak.AddingVitaminDtomilkhelpedtosolvethe

5、problem,andithasbeenavailableeversince.ForpeoplewhostillneedmoreVitaminD,thereisanotheroption；TakeVitaminDsupplements(补充物)．Theseproductsarewidelysoldinstores.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____

6、_______．A．aren’tabletomeettheirdeadlines7B．oftendon’tdresswarmlyenoughC．generallyliketoremainindoorsD．leavelotsofworkforotherstodoC　解析：细节理解题。根据第一段中的“Inthedeadofwinter，wedon’ttypicallythinkaboutspendingtimeoutdoors，butaccordingtomanyphysiciansweshould.”可知，在冬天人们愿意待在室内。2．Accordingtothetext，Vitami

7、nD___________．A．canbeobtainedbybeingexposedtothesunB．canbeusedtocurelifethreateningdiseasesC．canbemainlyfoundinsomemilkproductsD．canmakethechildren’sbonessoftandweakA　解析：细节理解题。根据第一段第二句以及第三段第一句可知，维生素D可以通过晒太阳获得，故选A。3．Whyissalmonmentionedi