2019版高考英语 Unit 7 The Sea夯练（含解析）北师大版必修3

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1、Unit7TheSea一、阅读理解。Inthedeadofwinter，wedon'ttypicallythinkaboutspendingtimeoutdoors，butaccordingtomanyphysiciansweshould.Thesunisourgreatestsourceofavitaminthatisessentialforgoodhealth—VitaminD.Thisimportantvitaminstrengthensbonesandteethandislinkedtothepr

2、eventionofheartdisease，cancerandmanyotherlifethreateningdiseases.Theremendeddailyrequirementis400600InternationalUnits(IU)．Insummer，peoplewithdarkbrowneyesanddarkerskinturnsunlightfromjust15minutesoutsidewithoutsunscreenintoadequateamountsofVitaminD.Evend

3、uringwinter，justa10minutewalkatmiddaycankeepthebody'sVitaminDathealthylevels.Duringbriefwinterwalks，wereceivethegreatestbenefitswhenwewearnosunscreenandexposeasmuchskintothesunaspossible.VitaminDcanbealsoobtainedfromfoods.SalmonisoneofthebestsourcesoftheV

4、itamin.Eggyolks(蛋黄)，cheese，mushroomsandsomeanimalorganscontainsmallerquantitiesofit.Toattractconsumers，foodpaniesaddVitaminDtosomeoftheirmilkproducts.ThepracticeofputtingtheVitaminintomilkbeganinthe1930s.Atthattime，manychildrenweresufferingfromrickets，ani

5、llnessthatiscausedbyadeficiency(缺乏)ofVitaminD．Itmadethechildren'sbonessoftandweak.AddingVitaminDtomilkhelpedtosolvetheproblem，andithasbeenavailableeversince.ForpeoplewhostillneedmoreVitaminD，thereisanotheroption：TakeVitaminDsupplements(补充物)．Theseproductsa

6、rewidelysoldinstores.However，anyoneconsideringtakingsupplementsshouldconsultaphysicianfirst.1．Duringthewintermonths，people________.A．aren'tabletomeettheirdeadlinesB．oftendon'tdresswarmlyenoughC．generallyliketoremainindoorsD．leavelotsofworkforotherstodo2．A

7、ccordingtothetext，VitaminD________.A．canbeobtainedbybeingexposedtothesunB．canbeusedtocurelifethreateningdiseasesC．canbemainlyfoundinsomemilkproductsD．canmakethechildren'sbonessoftandweak3．Whyissalmonmentionedinthisarticle?A．It'sseldompreparedinthecorrectw

8、ay.B．It'sausefuladditiontoaperson'sdiet.C．Ithasahugeimpactontheenvironment.D．Itsadvantageshavebeenexaggerated.4．Themainpurposeofthisarticleis________.A．tointroduceavaluablenutrientB．toadvertiseVitaminDsupplementsC．t