2013全國職稱英語等級考試全真模擬試題衛(wèi)生類三

2013英語等級考試全真模擬試題_衛(wèi)生類_C級（三 及格分數(shù)線：60.0分答題時間：120分鐘最高分數(shù)：96.0分試題數(shù)量：65題英語考試共每個類別又分三個級別：ABC6（15）、閱讀判斷（7）、概括大意與完成句子（8）、閱讀理解（45）、補全短文（10）、完形填空（15）1515.0151411Mostanimalfatsaresaturated,containingmorehydrogenthancarbon,anddonotspoilaseasilyasunsaturatedfats.[A][B]getused[C]go[D] spoilvi.腐爛(decaygo2BeforethefirstApollowenttotheMoon,aspotforlandingthelunarmodulewascarefullychosen.[A][B][C][D] spotn.地點,場所(ce,site,location)/lunarmodule登月艙/latitude緯度；范圍(range,3Theospreyfliesabovethewaterandwhenitspotsafishitswoopsdowntocatch[A][B][C][D] spotv.(detectdiscover)/ospreyn.swoopvi.(attacksuddenly;rushat)4Myauntsaidthatshecouldn’tstandbeingkept[A][B][C][D]put standv.經(jīng)受(endure,tolerate)/crumble (crumb,5Thetrumpetwaspartoftheoperaorchestralongbeforeitbecameastandardorchestral[A][B][C][D] standardadj.標準的(normal,regular)/trumpetn.喇叭/orchestralinstrument/tunefuladj.melodious,6Ithastakenmanyyearstoadoptinternationallyrecognizedstandardsforthelicensingofaircraftpilots.[A][B][C][D] standardn.標準(criteria)/licensev.,特(approbate,permit)/criterian.［criterion］n.banner,7RecentstudieshaveshownthatthestatureofmaleAmericanshasscarcelychangedinthepasttwohundredyears.[A][B][C]life[D]head staturen.身高,身材(height)/lifespan8EmilyGreeneBalch’ssteadfastlaborfordomandforcooperationamongindividualsandpeoplesbroughthertheNobelPeacePrizein1946.[A][B][C][D] steadfastadj.（firmunwavering)/unwaveringadj.(firm9TheamountoftimespentwatchingevisionintheaveragehouseholdintheUnitedStateshasrisensteadilysinceevisionsetswereintroducedinthe1950s.[A][B][C][D] steadilyadv.穩(wěn)定地(stably,consistenly)/discreetlyadv.謹慎(carefully,charily,warily)/disproportionayadv.不成比例地（outofEvenwithdetailedknowledgeaboutanarea,geologistscannoteasilylocatestoresofundergroundnaturalgas.[A][B][C][D] storen.（preservation,reposit,Itisunderstandablethatearlycivilizationsblamedstormsonthe[A]bad[B]unsuccessful[C][D] stormn.（badweathertempest)/godn.ManyofEdithWharton’sbeststorieswerecompletedunder al[A][B][C][D] strainn.tension)/tensionn.tensity,UnitedStatesNavyAdmiralAlfredMahanwrotemanybooksonnavalstrategyandsea[A][B][C][D] strategyn.策略,戰(zhàn)略(,tactics)/tacticsn.戰(zhàn)術(shù),策Awhaleshark’sbodyisstoutbutstreamlinedlikethatofa[A][B]brightly[C][D]smoothly streamlinedadj.(clipper-built,smoothyshaped)/stoutadj.(sinewy,robust)/stripedadj.Itiseasytomisjudgethestrengthofthe[B][C][D] strengthn.力,力量(,77.07A是錯誤信息，請在答題卡上把B在答題卡上把CEngineeringEngineeringethicsisattractingincreasinginterestinengineeringuniversitiesthroughoutthenation,atTexasA&MUniversity,evidenceofthisinterestinprofessionalethicsculminatedinthecreationofanewcourseinengineeringethics,aswellasaprojectfundedbytheNationalScienceFoundationtodevelopmaterialforintroducingethicalissuesintorequiredundergraduateengineeringcourses.AsmallgroupoffacultyandadministratorsactivelysupportedthegrowingeffortatTexasA&M,yetthisgroupmustnowexpandtomeettheneedsofincreasingnumbersofstudentswishingtolearnmoreaboutthevalueimplicationsoftheiractionsasprofessionalTheincreasingconcernforthevaluedimensionofengineeringis,atleastinpart,aresultoftheattentionthatthemediahasgiventocasessuchastheChallengerdisaster,theKansasCityHyatt-RegencyHowalkwayscollapse,andtheExxonoilspill.Asaresponsetothisconcern,anewdiscipline,engineeringethics,isemerging.Thisdisciplinewilldoubtlesstakeitscealongsidesuchwell-establishedfieldsasmedicalethics,businessethics,andlegalTheproblempresentedbythisdevelopmentisthatmostengineeringprofessorsarenotpreparedtointroducelitureinengineeringethicsintotheirclassrooms.Theyaremostcomfortablewithtativeconceptsandoftendonotbelievetheyarequalifiedtoleadclassdiscussionsonethics.Manyengineeringfacultymembersdonotthinkthattheyhavethetimeinanalreadyovercrowdedsyllabustointroducediscussionsonprofessionalethics,orthetimeinownschedulestopreparethenecessarymaterial.Hopefully,theresourcespresentedhereinwillbeofassistance.EngineeringethicsacompulsoryineveryinstituteofscienceandtechnologyintheUnited[A][B][C]Not C本文沒有述及engineeringethics是一門必修課，也沒有提到所有的理工ThenumberofstudentswishingtotakethecourseofengineeringethicsisdecliningatTexasA&MUniversity.[A][B][C]Not BTheNationalScienceFoundationinvolvesitselfdirectlyinwritingupmaterialaboutethicalissues.[A][B][C]Not BtheNationalScienceFoundation(全美科學)只是為編寫有關(guān)工程道德Itseemsthatmedicalethicsandbusinessethicsaremorematurethanengineering[A][B][C]Not A本題給出的信息是正確的。第二段有一句相關(guān)的句子：Thisdisciplinewilldoubtlesstakeitscealongsidesuchwell—establishedfieldsasmedicalethics,businessethics,andlegalethics.medicalethics,businessethics和legalethicswell—established的，其地位也已確立了。engineeringethicsmatureSeveralengineeringprofessorshavequitfromteachingtoagainstthecreationofafewcourseinengineeringethics.[A][B][C]Not 正確答案CManyengineeringprofessorsmaynothavetimetopreparematerialforclassdiscussiononprofessionalethics.[A][B][C]Not AManyengineeringfacultyheirownschedulestopreparethenecessarymaterial.Itislikelythatfollowingthisintroductorypassage,theauthorwillprovidethenecessarymaterialrelatedtothetopicofengineeringethics.[A][B][C]Not A本題給出的信息是正確的，根據(jù)是第三段的最后一句：Hopefully,theresourcespresentedhereinwillbeofassistance.88.02(1)23～2661～41(2)27～3064Theideaofrainmakingisalmostasoldasman,butitwasnotuntil1946thatmansucceededinmakingrain.Inancienttimes,rainmakershadclaimedtobringrainbymanymethods:dancingsinging,killinganimals(includinghumans).Foralongtime,menhaveunderstoodwhereraincomesfrom.Waterfromthesurfaceofoceansandlakesespartoftheair,whereitformscloudsfromwhichrainfalls.Butexactlywhatstartstheformationofraindropswasnotknownuntilquiterecently.AmannamedJohnAitkenprovedthatdropsofwatergatheraroundtinybitsofdustorothermatter.Thecentersofthedropsaresosmallthatthehumaneyecannotseethem.Withoutsuchcenters,itseemsraindropsdonotform.DuringWorldWarⅡ,Dr.IrvingLangmir,andhisassistantSchaefer,werehiredbytheGeneralElectrictostudyhowandwhyiceformsonthewingsofairnes.TheywenttoamountaininNewHampshire,wheresnowstormsarecommonandcoldwindsblow.Theyweresurprisedtofindthatoftenthetemperatureofthecloudssurroundingthemwasfarbelowthezingpoint,andyeticedidnotformintheclouds.AftertheWar,Schaeferexperimentedwithamachinethatcreatedcold,moistairsimilartotheairfoundinclouds.Toimitatethemoistairofacloud.Schaeferwouldbreatheintothemachine.Thenhewoulddropintothezerabitofpowder,sugar,orsomeothersubstance.Forweeksandmonthshetriedeverythinghecouldimagine.Nothinghappened.Nocrystalsoficewereformed.Noneofthesubstanceswouldserveasthecenterofasnowcrystalorraindrops.5OneJulymorning,Schaeferwasdropinbitsofvarioussubstancesandwatchingtheunsuccessfulresults.Finally,afriendsuggestedthattheygotoeatlunchandSchaeferwentwithhim.Asusual,heleftthecoverofthezerup,sincecoldairsinksandwouldnotescapefromthebox.Returningfromlunch,Schaeferfoundthatthetemperatureofthezerhadrisentoapointhigherthanthatrequiredforicecrystalstoremainsolid.Thereweretwochoicesnow.Hecouldclosethecoverandwaitforthezeritselftolowertheairtemperature,orhecouldmaketheprocessoccurfasterbyaddingdryiceagasinsolidformthatisvery,verycold.Hechosethelattern.Ashedroppedthe ingwhitedryiceintothezer.hehappenedtobreatheoutalargeamountofair.Andthere,beforehiseyes,ithappened!Hehadmadeicecrystals,notbyaddingcenterstothemoisture,butbycoolingthebreathsomuchthattheliquidhadtoformcrystals!ThenhebegantoblowhisbreathintothezeranddroplargepiecesofdryicethroughittocreatecrystalswhichbecameatinysnowstormfallingslowlytothefloorofhisAfternningcarefully,Schaefermadeanexperimentbydropdryicefromhisnetothecloudsbelowhim.Aswasexpected,snowformedandfellfromthebottomofthecloud.Schaefersucceeded.Hemadehistory.Paragraph [A]LangmirandSchaefer’sworkforthe[B]LangmirandSchaefer’sdiscoveryofrain-[C]Men’sknowledgeofrain-[D]Schaefer’sdiscoveryby[E]Schaefer’sseveralunsuccessful[F]LangmirandSchaefer’ssuccessful C本段簡略地敘述了雨水的來源和形成雨滴的部分Paragraph [A]LangmirandSchaefer’sworkforthe[B]LangmirandSchaefer’sdiscoveryofrain-[C]Men’sknowledgeofrain-[D]Schaefer’sdiscoveryby[E]Schaefer’sseveralunsuccessful[F]LangmirandSchaefer’ssuccessful ALangmirSchaefer(GeneralElectric),研究機翼結(jié)冰的成因。Paragraph [A]LangmirandSchaefer’sworkforthe[B]LangmirandSchaefer’sdiscoveryofrain-[C]Men’sknowledgeofrain-[D]Schaefer’sdiscoveryby[E]Schaefer’sseveralunsuccessful[F]LangmirandSchaefer’ssuccessful Paragraph [A]LangmirandSchaefer’sworkfortheGE[B]LangmirandSchaefer’sdiscoveryofrain-[C]Men’sknowledgeofrain-[D]Schaefer’sdiscoveryby[E]Schaefer’sseveralunsuccessful[F]LangmirandSchaefer’ssuccessful ESchaeferInancienttimes,rainmakerstriedtomakerainfordrylands,but [A][B][C][D][E][F] DInancienttimes,rainmakershadclaimedtobringrainbymanymethods:dancing,singing,killinganimals(includinghumans)。句中提到的作為造雨、求雨的的dancing,singing,killinganimals(includinghumans)等都不是科學的方法。Schaeferfoundawayofhowtomakeice [A][B][C][D][E][F] E26Schaefersuccessfullymadeafieldexperimentonrainmakingafternning [A][B][C][D][E][F] C答案的依據(jù)在第七段：Afternningcarefully,Schaefermadeanexperimentbydropdryicefromhisnetothecloudsbelowhim.Aswasexpected,snowformedandfellfromthebottomofthecloud.SchaefersucceededMandidnotsucceedinmakingrainuntil [A][B][C][D][E][F] 正確答案BButexactlywhatstartstheformationofraindropswasnotknownuntilquiterecently。1545.035441MultivitaminsUrgedforAllPregnantArecentstudyinTanzaniafoundthatwhenpregnantwomentookvitaminseveryday,fewerbabieswereborntoosmall.Babiesthatweighlessthantwoandone-halfkilogramsatbirthhaveagreaterriskofdying.Thosethatsurvivearemorelikelytoexperienceproblemswiththeirdevelopment.Andexpertssaythatasadultstheyhaveahigherriskofdiseasesincludingheartdiseaseanddiabetes.TheWorldHealthOrganizationestimatesthateveryyeartwentymillionbabiesarebornwithlowbirthweight.Nineoutoftenofthemarebornindevelocountries.ThenewstudytookceinDaresSalaam.4,200pregnantwomenreceivedmultivitamins.ThepillscontainedallofthevitaminsintheBgroupalongwithvitaminsCandE.Theyalsocontainedseveraltimesmoreironandfolatethanthelevelsadvisedforwomenindevelopednations.Pregnantwomenespeciallyinpoorcountriesmayfinditdifficulttogetenoughvitaminsandmineralsfromthefoodsintheirdiet.Thescientistscomparedthefindingswithresultsfromagroupof4,000womenwhodidnotreceivethevitamins.Areportbythescientists,fromtheUnitedStatesandTanzania,appearedintheNewEnglandJournalofMedicine.WafaieFawzioftheHarvardUniversitySchoolofPublicHealthledthestudy.NoneofthewomeninthestudyhadHIV,thethatcausesAIDS.Thescientistsreportedearlierthatdailymultivitaminswerealow-costwaytoreducefetaldeathsinpregnantwomeninfectedwithHIV.TheearlierworkinTanzaniaalsofoundimprovementinthemothersintheirnumberofbloodcellsknownaslymphocytes.Lymphocytesincreasethebody’simmunityagainstinfection.ThenewstudyinpregnantwomenwhowerenotinfectedwiththeAIDSfoundthatmultivitaminsreducedtheriskoflowbirthweight.Justundereightpercentofthebabiesborntowomenwhotookthemultivitaminsweighedlessthan2,500grams.Theratewasalmostnineandone-halfpercentinthegroupofwomenwhoreceivedacebo,aninactivepill,insteadofthevitamins.Butthevitaminsdidnotdomuchtoreducetheratesofbabiesbeingborntooearlyordyingwhilestillafetus.Still,theresearcherssaymultivitaminsshouldbeconsideredforallpregnantwomenindevelocountries.HowmanybabiesarebornwithlowbirthweightinthedevelopedcountrieseveryyearaccordingtoWHO?[A][B][C][D] CWHO2000200Apillofmultivitaminsmaycontainallofthefollowingsubstances[A]allvitaminsintheB[B]vitaminsCand[C]muchironand[D]antiviral DA、B、CDWhichofthefollowingisNOToneoftheeffectsofmultivitaminsmentionedinthe[A]Toreducetherateofbabiesborntoo[B]Toreducetheriskoflowbirth[C]Toreducefetaldeathsinpregnantwomeninfectedwith[D]Toincreasethenumberoflymphocytesinmothers’ ABC第三句提到，DAWhataroledolymphocytesyinthehuman[A]Toreducetherateofdyingwhilestilla[B]Toraisethebody’simmunityagainst[C]Tohelppreventthedevelopmentorheart[D]Tohelppreventthedevelopmentof BA、C、DHowmanypercentofbabieswerebornwithlowbirthweighttowomenwhowerenotinfectedwiththeAIDSandtookthemultivitaminsaccordingtoanewstudy?[A]Lessthan[B]About[C][D] Ajustundereightpercent（8%）Alessthan8%。AmericanMarriageandMoresurprising,perhaps,thanthecurrentdifficultiesoftraditionalmarriageisthefactthatmarriageitselfisaliveandthriving.AsSkolnicknotes,Americansareamarryingpeople:relativetoEuropeans,moreofusmarryandwemarryatayoungerage.Moreover,afteradeclineintheearly1970s,therateofmarriageintheUnitedStatesisnowincreasing.Eventhedivorcerateneedtobetakeninthispro-marriagecontext:some80percentofdivorcedindividualsremarry.Thusmarriageremains,byfar,thepreferredwayoflifeforthevastmajorityofpeopleinoursociety.Whathaschangedmorethanmarriageisthenuclearfamily.Twenty-fiveyearsago,thetypicalAmericanfamilyconsistedofahusband,awife,andtwoorthreechildren.Now,therearemanymarriagesinwhichcoupleshavedecidednottohaveanychildren.Andtherearemanymarriageswhereatleastsomeofthechildrenarefromthewife’spreviousmarriages,ofthehusband’s,orboth.Sometimesthesechildrenspendalloftheirtimewithoneparentfromtheformermarriage;sometimestheyaresharedbetweenthetwoformerspousesThus,onecanfindeverytypeoffamilyarrangement.Therearemarriageswithoutchildren;marriageswithchildrenfromonlythepresentmarriage;marriageswith”ful-time”childrenfromboththepresentandformermarriages;marriageswith”full-time”childrenfromthepresentmarriageand“part-time”childrenfromformermarriages.Therearestepfathers,stepmothers,half-brothers,andhalf-sisters.Itisnotallthatunusualforachildtohavefourparentsandgrandparents!Theseareenormouschangesfromthetraditionalnuclearfamily.Butevenso,eveninthemidstofallthis,thereremainsoneconstant:mostAmericansspendmostoftheiradultlifemarried.BycallingAmericansmarryingpeopletheauthormeans [A]Americansaremoretraditionalthan[B]Americansexpectmoreoutofmarriagethan[C]therearemoremarriedcouplesintheU.Sthanin[D]moreofAmericans,ascomparedwithEuropeans,prefermarriageandtheyacceptitatayoungerage. D作者把人叫作婚配的民族指的是：A.人比歐洲人更傳統(tǒng)；B.同歐洲人相比，人對的期望值更高；C.同歐洲人相比，有的已婚者；D.同歐洲人相比，的人喜歡生活而且結(jié)婚較早。Divorced [A]willmostlikely[B]preferthewaythey[C]havelostfaithin[D]arethevastmajorityofpeopleinthe A離婚的人：A.很可能再婚；B.喜歡自己的生活方式（離婚獨居）；C.對Whichofthefollowingcanbepresentedasthepictureoftoday’sAmerican[A]AtypicalAmericanfamilyconsistsofonlyahusbandanda[B]Manytypesoffamilyarrangementshave esocially[C]Americansprefertohavemorekidsthan[D]Therearenonuclearfamiliesany B下列能夠代表家庭景象的是：A.典型的家庭只有夫妻兩人組成；B.“Part-time” [A]spendsomeoftheirtimewiththeirhalfbrothersandsomeoftheirtimewiththeirhalfSisters[B]spendalloftheirtimewithoneparentfromprevious[C]aresharedbetweenthetwoformer[D]cannotstaywith“full-time” 正確答案CA.一半時間與異父（母）同母（父）兄弟在一起，一半時間與EventhoughgreatchangeshavetakenceinthestructureofAmericanfamilies, [A]thefunctionsofmarriageremain[B]thevastmajorityofAmericansstillhavefaithin[C]mostAmericanspreferasecond[D]allofthe B盡管的家庭結(jié)構(gòu)已發(fā)生了巨大變化：A.的功能沒有變化；B.大多數(shù)人仍對有信心；C.多數(shù)人喜歡再婚；D.以上全部。SilentandTransientischemicattacks(TIAS),orministrokes,resultfromtemporaryinterruptionsofbloodflowtothebrain.Unlikestrokes,theypresentsymptomslastinganywherefromafewseconds24hours.Rarelydotheycausepermanentneurologicaldamage,buttheyareoftenprecursorsofamajorstroke.“Ourmessageisquiteclear,”saysDr.RobertAdams,professorofneurologyattheMedicalCollegeofGeorgiainAugust.”TIAS，whilelessseverethanstrokesintheshortterm,arequitedangerousandneedaquickdiagnosisandtreatmentaswellasappropriatefollow-uptopreventfutureinjury.”Unfortunay,ministrokesaregreatlyunderdiagnosed.AstudyconductedfortheNationalStrokeAssociationindicatesthat2.5%ofalladultsaged18orolder(about4.9millionpeopleintheU.S.)haveexperiencedaconfirmedTIA.Anadditional1.2millionAmericansovertheageof45,thestudyshowedhavemostlikelysufferedaministrokewithoutrealizingit.Thesefindingssuggestthatifthepublicknewhowtospotthesymptomsofstroke,especiallyministrokes,andsoughtpromptmedicaltreatment,thousandsoflivescouldbesavedandmajordisabilitycouldbeavoided.Theproblemisthatthesymptomsofaministrokeareoftensubtleandpassing.Nonetheless,therearesignsyoucanlookoutfor:Numbnessorweaknessintheface,armorleg,especiallyononesideofthebody.TroubleseeinginoneorbothConfusionanddifficultyspeakingorunderstanding.Difficultywalking,dizzinessorlossofcoordination.Severeheadachewithnoknowncause.Alongwiththesesymptoms,researchershaveidentifiedsomekeyindicatorsthatincreaseyourchancesofhavingafull-blownstrokeafteraTIA:ifyou’reover60,haveexperiencedsymptomslastinglongerthan10minutes,feelweakandhaveahistoryofdiabetes.Aswithmanydiseases,youcanhelpyourselfbychangingyourlifestyle.Thefirstthingsyoushoulddoarequitsmoking,limityourintakeofalcoholtonomorethanadrinkortwoadayandincreaseyourphysicalactivity.Eventhosewhosufferfromhighbloodpressureordiabetescanimprovetheirodds—andminimizecomplicationsiftheydohaveastroke—bykeetheirillnessIfyouexperienceanyofthesymptoms,yourfirstcallshouldbetoyourdoctor.Itcouldbethecallthatsavesyourlife.WhichofthefollowingisNOTtrueof[A]Thecauseofthemremains[B]Theyseldomcausepermanentneurological[C]Theysymptomsofthemareoften[D]Theyarenotunrelatedtomajor Topreventministrokesfromturningintomajorstrokes,Itisimportant [A]savethousandsof[B]avoidmajor[C]seekpromptmedical[D]preventfuture CThepassageindicatesthatthesymptomsof [A]arealwayseasyto[B]arefrequentlyhardto[C]usuallylastacoupleof[D]canbynomeansbe B文章第三段表明許多人得了小卒中卻沒有這一點，第四段中又小卒中subtleB。AllofthefollowingmaybesignsofministrokesEXCEPT [A]troubleseeinginone[B]numbnessinthe[C]lossof[D]severeheadachecausedbyexternal D文章中沒有明確原因的頭疼可能是發(fā)生小卒中的癥狀之一，而此處明確是由外傷引起的頭疼，故選項DItcanbeinferredfromthepassagethatministrokes [A]moredangerousthanmajor[B]silentand[C]difficultto[D]suretoleadtomajor B文章表明小卒中常在人們不知不覺的情況下發(fā)生并可能造成極大的，因此答B(yǎng)。510.0565UVLightCausesSkinDon’tlaughifyouhearaboutkidshidingintheirbasementsummer.TheymighthavebeenfrightenedbyarecentreportfromEuropethatliquidsunscreensdon’tprotectpeoplefromthesunsharmfulrays.Researcherskepttrackof631children,someofwhomusedsunscreenand(1).Theresearchersfoundthatthekidswhousedsunscreengotmoresuncausedmolesthandidthekidswhodidn’tusesunscreen.Kidswithsuncausedmolesaremorelikelytodevelopskincancerlaterinlife.Didsunscreenharmthechildren?Probablynot,theresearchersconcluded.Theybelievethatthechildrenreliedtoomuchontheirsunscreenandstayedinthesuntoolong.Sunscreenisstillsafetouse,sayskinexperts,aslongasitisusedsensibly.SolarUsingsunscreensensiblyismoreimportantthanever.Why?SkinexpertslikeMartinWeinstockbelievethat(2).Earth’sozonelayerappearstobegettingthinner.Ozoneisagas.Intheupperatmosphere,ozoneblocksmuchofthesun’sharmfulultraviolet(UV)radiation.Pollutingchemicalsarethoughttobedestroyingtheozoneinsomeces.Eventhoughtheworld’swealthycountriesagreedtostopmakingpollutingchemicalsafewyearsago,ozoneisstilldisappearing.Andthat’sbadnews,skinexpertssay,becauseUVlightcausesskincancer,andskincanceristhemostcommonkindofcancerintheUnitedStates.MorethanamillionnewcasesofskincancerareshowingupintheUnitedStateseveryyear.Scientistsarelookingatkidstoreversethattrend.Why?Becausegettingtoomuchsunwhenyou’reakidseemstosetthestageforgettingskincancerwhen(3).AccordingtoWeinstock,three-quartersofallskincancersmightneverdevelopifpeopleundertheageof18avoidedoverexposuretothesun.GlaringWhathappenswhenskinmeetssun?Lightrays,whichcomeinvaryingwavelengths,striketheskin.Visiblelightconsistsofwavelengths(4).Ultravioletlightconsistsofwavestooshorttobeseen.UVlightcomesinseveralvarieties,amongthemUVBandUVA.UVBwavelengthsareslightlyshorterthanUVAwavelengths.ScientistsoncethoughtthatUVBlightwasharmfulandthatUVAlightproducedahealthfultan.Butopinionshavechanged.ScientistsstillagreethatUVBlightcausessunburns.ButnowtheythatbothkindsofUVlightdamagetheDNAofcells.Moreover,scientistsbelievethateitherUVAlightorUVBlightorbothweakenthebody’sdiseasefightingimmunesystem.Thebodyeslesscapableofrepairingdamagedcells,andsuchcellsmaygoontodivideuncontrollably.Inotherwords,(5).ThreeLittleTohelppeopleavoidgettingharmedbythesun,theAmericanCancerSocietyhassummedupitsadviceinthreewords:Slip,SlopandSlap.Thewordsareshortfor“Sliponashirt!Sloponthesunscreen!Slaponahat!”