【广东专用】2014届高考英语一轮复习课时作业(十二) [必修3 unit 2 healthy eating]

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1、课时作业(十二)　[必修3　Unit2　Healthyeating](限时：45分钟)　　　　　　　　　　　　　　　　　　　Ⅰ.语法填空Vitaminsarecomplexchemicalsubstances1.________(find)inmanyfoods.Thehumanbodyneedsthemforhealthand2.________(grow).Thebodymakessomevitamins,3.________usuallyinamountstoosmalltomeetitsneeds.4.________vitaminsarenotmadeinthebody.T

2、hesemustbesupplied.Nooneknowsexactly5.________allvitaminswork.Doctors6.________knowthatvitaminshaveveryspecialuses.Onevitamin7.________cannottaketheplaceofanother.Thesteadyabsenceofonevitaminin8.________otherwisecompletedietcausesadeficiencydisease.Rickets,scurvy,andpellagraareexamplesofdeficie

3、ncydiseases.Itisbesttoobtainvitamins9.________eatingthefoodsinwhichtheyoccur.Therearealsopillsthatcontainasinglevitaminoracombinationofvitamins.Peopleshouldconsult10.________doctorsbeforetheytakeanyvitaminpills.Ⅱ.阅读理解AYouknoweatingfruitandvegetablesdoesgood.Butdoyouknowitcanalsomakeyoulookgood?

4、Peoplewhoincreasedtheirintakeoverjustsixweeksdevelopedahealthyglowandappearedmoreattractive,researchersfound.ScientistsatStAndrewsUniversityfoundeatingthemslightlyincreasedyellowandredpigmentsinthevolunteers'skin.Theymonitoredthefoodintakeof35peopleandtookpicturesoftheirfaces,armsandhandsusinga

5、sensitivecameraatthestart,andafterthreeandsixweeks.Increasingtheirintakeofgreensby2.9portionsadaywasfoundtomakethepersonlookmorehealthyandanextra3.3portionscouldenhancetheirattractiveness,whentheirphotographswereratedbyothers.Fruitandvegetablesarerichincarotenoids(类胡萝卜素),whichareknowntoprotecta

6、gainstcelldamagefrompollutionandUVrays,andcanalsopreventagerelateddiseasesincludingheartdiseaseandcancer.Butwhileitwasknowneatingextremeamountsofcertainvegetablessuchascarrotscouldturnskinorange,itwasnotknownasmallincreasewasperceptible(被觉察)toothersandwasseenasappealing.Acamerameasuredchangesto

7、theskin'sredness,yellownessandlightness,andfounditsignificantlychangedinpeoplewhonaturallyincreasedtheirintake.Thesechangeswerenotevidentinthreeweeks.Usinglightsensors,theresearchersshowedtheseredandyellowhueswerelinkedwiththeleve