上海豐華中學(xué)2024年高三3月份模擬考試英語(yǔ)試題含解析

上海豐華中學(xué)2024年高三3月份模擬考試英語(yǔ)試題請(qǐng)考生注意：1．請(qǐng)用2B鉛筆將選擇題答案涂填在答題紙相應(yīng)位置上，請(qǐng)用0．5毫米及以上黑色字跡的鋼筆或簽字筆將主觀題的答案寫在答題紙相應(yīng)的答題區(qū)內(nèi)。寫在試題卷、草稿紙上均無(wú)效。2．答題前，認(rèn)真閱讀答題紙上的《注意事項(xiàng)》，按規(guī)定答題。第一部分（共20小題，每小題1.5分，滿分30分）1．Thetrafficproblemswearelookingforwardtoseeingshouldhaveattractedthegovernment'sattention.A．solving B．solve C．solved D．tosolve2．TheBrownsheld_______theycalled“familyday”onceeachyear.A．that B．what C．which D．when3．Workinghardisnota__________ofgreatsuccess,butitisamongtheessentialrequirements.A．sign B．signalC．guarantee D．mark4．—ThankGod!Thisschooltermiscomingtoanend!—Yeah,afterallthathardwork,weallaholiday.A．preserve B．observe C．reserve D．deserve5．Whatisyourmainreasonforchoosingonerestaurantanother?A．overB．ofC．fromD．for6．—Isay,Harry.Whatdidyousaytothelaid-offworkerjustnow?—Nothing.Itomyself.A．hadonlytalked B．a(chǎn)monlytalking C．havejusttalked D．wasjusttalking7．—IheardMr.Morganwouldbehereat4:00pm.nextThursday.—No,he_____atthattime.A．wasboardingB．wouldbeboardingC．willbeboardingD．isboarding8．Moreoftenthannot,theenterprisearoundusaregettingevenricher,________recipeisdon’tputallyoureggsinonebasket.A．ofwhich B．whichC．whose D．ofwhom9．Inordertomakemycompositionclearerandsmoother,myteacheraskedmeto_________theunnecessarywordsandsentences.A．leavealone B．leavebehindC．leaveoff D．leaveout10．MeizhouIslandissuchabeautifulplaceofinterest______everyonelikestovisit.A．a(chǎn)s B．that C．which D．where11．NASAhasmadea________thatourearthhasnothreatassociatedwiththefilm2012whichisbasedonpuremyths.A．clarification B．classification C．identification D．presentation12．—Mum,IbrokeDad’ssunglassesthismorning.—Youneedtomakeanapologyforyourfault,________youwillregret.A．a(chǎn)ndB．orC．butD．for13．Ifweusethenewrecyclingmethod,alargenumberoftrees.A．a(chǎn)resaved B．willsave C．willbesaved D．havesaved14．Thenewsshockedthepublic，______togreatconcernaboutstudents'safetyatschool.A．havingled B．ledC．leading D．tolead15．Thisisthefirsttimethatyourparentshavebeenabroad,______?A．haven’tthey B．hasn’tit C．a(chǎn)ren’tthey D．isn’tit16．Thedifferencesthechildren’sachievementscannotbecompletelyexplained________theirsocialbackgrounds.A．infrontof B．incaseofC．inneedof D．inchargeof17．–MyTVsetdoesn’twork,thewatertapisdrippingandmycarisstillunderrepair!–Yousure________badluckthesedays.A．had B．willhave C．hadhad D．a(chǎn)rehaving18．Allenfollowedhiscustomeracrosstheyardandstoodonthestepofthehouse,twoshoppingbags.A．lifted B．havinglifted C．tolift D．lifting19．—John,doyouknowwhythesuspectwassetfree?—Forlackof________evidence.A．solidB．a(chǎn)pparentC．a(chǎn)mbiguousD．concrete20．Theyhaveleadingexpertsinthisfield，andthat's__________they'vemadeimportantprogress．A．where B．whyC．whether D．who第二部分閱讀理解（滿分40分）閱讀下列短文，從每題所給的A、B、C、D四個(gè)選項(xiàng)中，選出最佳選項(xiàng)。21．（6分）Microsofthasdevelopedanewsmartphoneappthatidentifyeyesignalsandtranslatesthemintoletters,allowingpeoplewithmotorneuronedisease(運(yùn)動(dòng)神經(jīng)元癥)tocommunicatewithothersfromaphone.TheGazeSpeakappcombinesasmartphone’scamerawithartificialintelligencetorecognizeeyemovementsimmediatelyandchangethemintoletters,wordsandsentences.ForpeoplesufferingfromALS(漸凍癥),alsoknownasmotorneuronedisease,eyemovementcanbetheonlywaytheyareabletocommunicate.“Currenteye-trackinginputsystemsforpeoplewithALSareexpensive,notstrongundersunlight,andrequirefrequentre-adjustmentandmaterial,relativelysteadysetups,”saidXiaoyiZhang,aresearcheratMicrosoftwhodevelopedthetechnology.“Toeaseoffthedisadvantages,wecreatedGazeSpeak,aneye-gesturecommunicationsystemthatrunsonasmartphone,andisdesignedtobelow-cost,strong,portableandeasytolearn.”Theappisusedbythelistenerbypointingtheirsmartphoneatthespeaker.Achartthatcanbestucktothebackofthesmartphoneisthenusedbythespeakertodeterminewhicheyemovementstomakeinordertocommunicate.Thestickershowsfourgridsofletters,whicheachisequaltoadifferenteyemovement.Bylookingup,down,leftorright,thespeakerselectswhichgridstheletterstheywantbelongto.Theartificialintelligenceisthenabletopredictthewordorsentencetheyaretryingtosay.Zhang’sresearch,Smartphone-BasedGazeGestureCommunicationforPeoplewithMotorDisabilities,issettobepresentedattheConferenceonHumanFactorsinComputingSystemsinMay.(265)1、Accordingtothepassage,peoplewithALScancommunicatewithothersby__________.A．eyecontactB．bodylanguageC．handshakingD．languageexpression2、WhichofthefollowingisNOTtheadvantageofGazeSpeak?A．cheapB．unsteadyC．a(chǎn)ccessibleD．learnable3、Howdothespeakersusetheapp?A．Theypointattheletterstheywantonthephone.B．Theypredictthewordorsentencetheytrytosay.C．Theyturntothelistenerstospeakoutthelettersforthem.D．Theylookinthefourdirectionstochoosethegridofletters.4、Whichofthefollowingmightbethebesttitleforthetext?A．PeopleSufferingFromALSNeedsHelpB．SmartphoneAppHelpsALSSufferersSpeakWithEyesC．HowDoPeopleWithALSCommunicateWithOthersD．ResearchersDevelopTheNewSmartphoneApp22．（8分）BikesharinghavebecomepopularwordsincitiesfromCapeTowntoShanghaitoMelbourne.Planners,politiciansandmediakeepshowingofftheirbenefits:reducingpollution,congestion,travelcostsandoildependence,whileimprovingpublichealth.Bikesharingalsohelpsmakecitiesappearmodern,dynamicandworld-wide—qualitiesmuchsoughtafterbythecreativeclass.Butwhatmakesforasuccessfulpublicbike-sharingprogram?Thisisanimportantquestionbecauseinstallingonerequiressignificantpublicandprivateinvestmentandadjustmenttothebuiltenvironment.Whilemanyprogramshavebeenlaunchedamongmuchpraise,oftentheirpopularityhassoondeclined.Manyendupoperatingatafinanciallossanddependonotherprofitableenterprisestocross-subsidize(交叉補(bǔ)貼)them.Somehaveresultedinthrown-awaybikesbecominganeyesore.Understandingwhichfactorsenhanceorstoppublicbikesharingiscriticalinhelpingcitiesdecidewhethersuchaprogramisworkable,beforeconsideringwhatdesignandsittingwillworkbest.Drawingoncurrentknowledge,wediscusstheimportanceofthelocallandscape,climate,cyclinginfrastructure(基礎(chǔ)設(shè)施)andlanduse.Wealsotouchonotherfactors,suchasthelegalenvironmentandthecharacteristicsofthebike-sharingprogramitself.Takenaturalenvironmentforexample.Twonaturalenvironmentfactorsareknowntoaffectparticipation:hillinessandweather.Hillinessdiscouragesbalancedbike-sharinguse,asusersavoidreturningbicyclestostationsonhilltops.Thosestationsendupbeingempty,whilestationsonflatareasareoftenfull,souserscannotfindastationtoreturntheirbikes.Asforweather,idealtemperaturerangesvarybytheclimatezone.Casestudiesshowwarmanddryweatherencouragespublicbike-sharinguse.Rainandstrongwindreducethefrequencyoftrips.However,someapproaches,suchasprovidingsheltered,shaded,orevenheatedorcooledcyclinginfrastructure,couldproveuseful.1、WhatcanweinferaboutbikesharingfromParagraph1?A．Ithasnodisadvantage.B．Itiswelcomedworldwide.C．Itcansolveeveryproblem.D．Itisthesymbolofmoderncities.2、Whatisthecurrentsituationofbike-sharingprograms?A．Manyofthemrunataloss.B．Mostofthemmakehugeprofits.C．Theyarethemostpromisingbusiness.D．Theirdevelopmentisdeterminedbypublicinvestment.3、Whydoestheauthormentionthenaturalenvironment?A．Toshowuser’sinterestinvariousnaturalenvironment.B．Toshowthedecisivefunctionofnaturalenvironment.C．Toshowthenecessityofbike-sharingprograms.D．Toshowthesignificanceofsomefactors.4、Whichofthefollowingmightincreasebike-sharinguse?A．Hilliness.B．Attractivebikes.C．Rainandstrongwind.D．Perfectcyclinginfrastructure.23．（8分）Americanfamiliesareaccustomedtosettlinginfarawayplaces,whichhasbeenanationalphenomenon.Decadesofdata,includingamorerecentGallupstudy,characterizestheUSasoneofthemostgeographicallymobilecountriesintheworld.“AboutoneinfourUSadults(24percent)hasreportedmovingwithinthecountryinthepastfiveyears.”thereportednoted.WiththeexceptionofFinns(23percent)andNorwegians(22percent),AmericansmoveconsiderablymorethantheirEuropeanpeers.Thoughsomemaymoveforloveorfamily,themajorreasonwhyAmericanschoosetomovearoundis,unsurprisingly,relatedtowork.CitingdatafromtheCurrentPopulationSurvey,apostontheblogoftheNewYorkFednotedthatbetween58and2013,“slightlymorethanhalfofinterstate(州際的)migrantssaidtheymovedforemployment-relatedreasons—acategorythatincludesmovesundertakenfornewjobs,jobtransfers,andeasiercommutes(通勤).”Theseekingofopportunity,particularlyforanimmigrantnation,isanationalmythology(神話)aswellasanemotionalattachmenttowork.AnewworkingpaperanalyzedbyBenStevermanatBloombergsuggeststhatworkersintheUSnow“putinalmost25percentmorehoursthanEuropeans”inagivenyear.Thisfigurehassteadilyrisensincethe30s,whenthehoursloggedbyworkersinWesternEuropeandtheUSwereroughlythesame.Thereare,ofcourse,someinternalfactors.TheUSismuchvasterthanmostEuropeancountries,plusitboasts(擁有)acommonlanguage.ItisconsideredtobeasignofanefficientlabormarketthatUSworkerscanbepersuadedtomovetoregionswherethereisasteadygrowthinjobs,suchastheSunBeltinrecentyears.AndwhileAmericanworkersoftenhavefewerlaborprotectionsthantheirEuropeancounterparts,asareportbytheWorldBanknotedin2012,American“l(fā)aborlawsgiveemployersthepowertofire,hire,orrelocate(重新安置)workersaccordingtotheirneeds”，aflexibilitythatisthoughttoaideconomicgrowth.TheWorldBandreportaddedthattheoccupationoftheaverageUSemployeein66was4years,comparedto10yearsintheEuropeanUnion.Nevertheless,whileAmericansremainexcessivelymobile,FaithKarahanandDariousLiattheNewYorkFedarethelatesttonotethatUSworkersaremovingaroundlessthanbefore.Duringthe40s,3percentofworking-ageAmericansrelocatedtoadifferentstateeachyear;thatfigurehadbeencutinhalfby2010.“WhilepartofthedeclinecanbeattributedtotheGreatRecession，”theauthorssuggest,“this__phenomenontookplaceoverthecourseofseveraldecadesandisnotnecessarilyrelatedtotheeconomicconditions.”Sowhataccountsforthisphenomenon?Around-upoftheoriesbyBradPlumeratTheWashingtonPostincludedtheagingoftheUSworkforce,thefurtherriseoftwo-incomehouseholds,theburdensofrealestate,evolvingworkplaceculture,aswellastheflatlineofwages,whichmakesmovingawayforajob,onaverage,alessrewardingfinancialproposition.KarahanandLiputmuchstockintheeffectsofanagingworkforce,towhichtheyattributeatleasthalfofthedeclineininterstatemigration.“Inshort,ayoungindividualtodayismovinglessthanayoungpersondidinthe40sbecauseofthehigherpresenceofolderworkers，”theywrite,suggestingthatemployershaveshiftedtheiremploymenttactics(策略)toadapttothechangingdemographics(人口統(tǒng)計(jì)數(shù)據(jù))oftheworkforce.Needlesstosay,moviesaboutthiserainAmericanlife,inwhichfewerpeoplesetouttostartlivesinwide-rangingplaces,willprobablybemuchlessexciting.1、Accordingtothepassage,inthepastfiveyears,Americanshavemoved________.A．relativelylessthantheBritish B．lessfrequentlythanItaliansC．slightlymorethanNorwegians D．considerablymorethanFinns2、WhatcanweinferfromParagraphs2and3?A．Americanschoosetomovemainlyforworkandfamily.B．Americanshaveaverystronginterestinwork.C．AmericansinvestedmoretimeinworkthanEuropeansin35.D．AmericanstendedtomovetoEuropebetween58and2013.3、WhichofthefollowingisNOTthereasonwhyAmericanworkersmovemorethantheirEuropeanpeers?A．ThereisacommonlanguageintheUS.B．TheUSismuchvasterthanmostEuropeancountries.C．Americanlaborlawsgiveemployersmorefreedomtodealwiththem.D．Theyareofferedmoreefficientlaborprotections.4、Theunderlinedpart“thisphenomenon”inParagraph5refersto________.A．theGreatRecessionB．thedeclineofworking-ageAmericans'interstatemigrationC．thereductioninthenumberofworking-ageAmericansD．Americans'tendencytoremainmobile5、HowdoAmericanemployersdealwiththeagingworkforceaccordingtothepassage?A．Bystickingtotheirpreviouspolicies. B．Byadjustingtoit.C．Byimprovingtheiremployees'jobskills. D．Byraisingemploymentstandard.6、AstothecurrentsituationofAmericansmigration,theauthormightfeel________.A．curious B．strange C．confused D．disappointed24．（8分）Volunteeringabroadisagreatwaytohelpothers,improveyourskillsandbecomeamoreconfident,independentperson.Ifyouareinterestedinvolunteeringabroad,herearesomeplacestogo.AustraliaIfyouseekalifeonthebeach,inagreatclimatewithfriendlypeople,Australiamightbeyourbestbet.WiththousandsofvolunteersalreadysigninguptoleaveforAustraliaduringtheholidays,itwillbeaverypopularoption.BrazilThisvastcountryhassomegreatopportunitiesonofferandisespeciallypopularthisyear.AlotofvolunteerworkisavailableinBrazilcentersonconservationandecologicalprojects.Withtheworld’slargestrainforestinBrazil,ofwhichhugepartisindanger,therearelotsofdifferentjobsyoucando.KenyaKenyaisthedestinationforthoseseekinganAfricanexperience.GenerallyvolunteersinKenyaworkinorphanages(孤兒院)orwithlocalchildrenlivinginslums(貧民窟).ThereisagreatdemandforvolunteersinAfricabecausemanypeopleliveinpoverty,soifyoutrulyfeellikemakingadifferencetoacommunity,Kenyashouldbeatthetopofyourlist.CostaRicaGoldensandybeaches,clearcoastlinesandbeautifulcitiesarewhatCostaRicaisallabout.Becauseofitssmallsize,youcanseealotofthecountryinjustashorttime.Youcanreallymakethemostofyourtimeasavolunteer.Alotofworkisneededwithwildlifeandecologicalwork,soifyouwanttolookafterturtles(海龜)onthebeach,CostaRicacouldbejusttheplaceforyou.1、Wherewillyouprobablygoifyouareinterestedinprotectingtheenvironment?A．Australia. B．Brazil.C．Kenya. D．CostaRica.2、WhatcanbeinferredfromthepassagethatvolunteersinKenyamainlyworkwith?A．Children. B．Theelderly.C．Animals. D．Plants.3、WhatshouldyoudoifyouchoosetogotoCostaRica?A．YoushouldsurfwithchildreninthewaterB．YoushouldtakecareoftreesintheforestsC．YoushouldworkwithanimalsonthebeachD．Youshouldlookafterchildrenwhohavelosttheirparents25．（10分）Conventionalwisdomsaysthathardshipcanmakeusoldbeforeourtime.Infact,anewstudysuggeststhatviolencenotonlyleaveslong-termscarsonchildren’sbodies,butalsochangestheirDNA,causingchangesthatareequaltoseventotenyearsofprematureaging.Scientistsmeasuredthisbystudyingtheendsofchildren’schromosomes(染色體）,calledtelomeres(端粒),saysIdanShalev,leadauthorofastudypublishedinMolecularPsychiatry.TelomeresarespecialDNAsequences(序列）whichpreventtheDNAinchromosomesfromseparating.Theygetshortereachtimeacelldivides,untilacellcannotdivideanymoreanddies.Severalfactorshavebeenfoundtoshortentelomeres,includingsmoking,radiationandpsychologicalstressessuchasbeingtreatedbadlywhenyoungandtakingcareofachronicallyillperson.Inthisstudy,researchersexaminedwhetherexposuretoviolencecouldmakechildren’stelomeresshortenfasterthannormal.Theyinterviewedthemothersof236children3tages5,7and10,askingwhethertheyoungstershadbeenexposedtodomesticviolencebetweenthemotherandherpartner;physicalmaltreatmentbyanadult;orbullying.Researchersmeasuredthechildren'stelomeres—incellsobtainedbywipingtheinsidesoftheircheeks一atages5and10.Telomeresshortenedfasterinkidsexposedtotwoormoretypesofviolence,saysShalev.Unlessthatpatternchanges,thestudysuggests,thesekidscouldbeexpectedtodevelopdiseasesofaging,suchasheartattacksormemoryloss,sevento10yearsearlierthantheirpeers.Shlevsaysthereishopeforthesekids.Hisstudyfoundthat,inrarecases,telomeresBetternutrition,exerciseandstressreductionarethreethingsthatmaybeabletolengthentelomeres,hesays.Thestudyconfirmsasmallbutgrowingnumberofstudiessuggestingthatearlychildhoodadversityimprintsitselfinourchromosomes,saysCharlesNelson,aprofessorofpediatricsandneuroscienceatHarvardMedicalSchool.1、Thenewstudyfoundthat.A．hardshipcanchangeachild'smemoryB．violencecanspeedupachild'sagingC．violenceleavesscarsonachildsmindD．hardshiphasaneffectonachild’smind2、Whatdoestheunderlinedword“they”inParagraph3referto?A．Telomeres.B．Children.C．Chromosomes.D．DNAsequences.3、Whatcanbeinferredfromthetext?A．Violencecancausequickcelldeathinchildren’sbody.B．Telomerescanhelppreventchromosomesfromseparating.C．Childrenwhohaveshortertelomereshaveheartattackslater.D．Beingtreatedbadlywillmakeachild’stelomeresshortenfaster.4、Whatisthebesttitleforthetext?A．ViolenceandTelomeresB．TheFunctionofTelomeresC．ViolenceMakesChildrenAgingD．DNAInfluencesChildren’sGrowth第三部分語(yǔ)言知識(shí)運(yùn)用（共兩節(jié)）第一節(jié)（每小題1.5分，滿分30分）閱讀下面短文，從短文后各題所給的A、B、C和D四個(gè)選項(xiàng)中，選出可以填入空白處的最佳選項(xiàng)．26．（30分）完形填空Onmywaytoworkeveryday,Idrivedownastreetlinedwithpinetrees．Onetreeinparticular1myattention．Itmusthavesufferedsome2．Partofitstrunkgrewnearlyparalleltotheground,andtheninaneffortto3itsowncourseoflife,thetrunktooka90degreeturn4tostandtallandstretchtowardthesun.EachdayasIdroveby,IsawthisbentbutdeterminedtreeandIwouldbe5．Itwasaremindertomethat6Imaynothavehadthebeststartinlife,Icouldchange7inthepartsofmylifeatanytime.Iwasplanningtostoponedaytogetaperfect8ofmykindred-spirit(志趣相同的)tree．ButthatweekIwasbusy．Afterthatweek,Istilldidn’ttakeanyaction．EverytimeIdrovebythetreeIwould9myself,“Tomorrow,I’llstoptomorrowtotakeone.”Thenoneday,asIdroveby“my”tree,Iglancedover,andmuchtomy10,Ifoundasawed-offstump(樹(shù)樁)wherethattreehadstood．Ihad11myplanuntil“tomorrow”andtomorrowprovedtobetoo12.Whathaveyoubeenputtingoff?Whatwouldyoudotodayifyouknewyouwould13havetheopportunitytodoitagain?Whynotdothosethingsthatyouhavebeenputtingoffuntiltomorrow?1、A．caught B．paid C．fixed D．escaped2、A．experience B．influence C．defeat D．damage3、A．change B．design C．follow D．imagine4、A．a(chǎn)pplying B．a(chǎn)ttempting C．learning D．happening5、A．satisfied B．interested C．encouraged D．educated6、A．eventhough B．a(chǎn)sif C．incase D．ifonly7、A．habit B．direction C．plan D．purpose8、A．review B．picture C．glance D．knowledge9、A．call B．help C．tell D．warn10、A．regret B．pleasure C．happiness D．surprise11、A．cutoff B．takenoff C．putoff D．calledoff12、A．sad B．far C．good D．late13、A．never B．ever C．surely D．a(chǎn)lmost第二節(jié)（每小題1.5分，滿分15分）閱讀下面材料，在空白處填入1個(gè)適當(dāng)?shù)膯卧~或括號(hào)內(nèi)單詞的正確形式。27．（15分）語(yǔ)法填空Anewreportshowsthatelectronicbanking,Internetmarketingandotheronlineactivitiesarenolongerjustforpeopleinrichcountries.Thereport1．(come)fromtheInternationalTelecommunicationUnion(ITU),2．isanorganizationoftheUnitedNations.TheITUsaidthatall47oftheworld’sleastdevelopedcountriesaremakingprogressinincreasingInternetaccess3．theircitizens.Andmorethan60percentofthepeoplethereareabletousea3Gnetwork.Theterm3Gmeansthe4．(three)generationofwirelessmobiletelecommunicationstechnology.Thereportsaidthatbytheendof2017,about700millionpeopleintheleastdevelopedcountries5．(sign)upforaplanwithamobilephoneserviceprovider.Inthoseareas,80percentofthepopulationliveswithintherange(范圍)ofamobilecellularnetwork.Giventhisprogress,theITUpraisedthegrowthofdigitaltechnology.Itsaidtheworld’sleastdevelopedcountriesareontheirwayto6．(meet)theUN’sSustainableDevelopmentGoalsonuniversal(全體的)andaffordableInternetaccessby2020.TheITUsaiduniversalandlow-costInternetaccesscanhelp7．poorestcountriesmoveforwardinfieldslike8．(educate),healthandtrade.Whilethefindingssound9．(hope),thereportregardedthelackofdigitalskillsasabarrier(障礙)toinformationcommunicationtechnologyandInternetuseinpoorareas.TheITUcalledonpolicymakers,industryleadersandeducatorstoworktogether10．(increase)digitalskillsacrosstheleastdevelopedcountries.第四部分寫作（共兩節(jié)）第一節(jié)短文改錯(cuò)（滿分10分）28．（10分）短文改錯(cuò)（共10小題，每小題1分，滿分10分）假如英語(yǔ)課上老師要求同桌之間交換修改作文，請(qǐng)你修改你同桌寫的以下作文。文中共有10處語(yǔ)言錯(cuò)誤，每句中最多有兩處。每處錯(cuò)誤僅涉及一個(gè)單詞的增加、刪除或修改。增加：在缺詞處加一個(gè)漏字符號(hào)（^），并在其下面寫出該加的詞。刪除：把多余的詞用斜線（\）劃掉。修改：在錯(cuò)的詞下面劃一橫線，并在該詞下面寫出改正后的詞。注意：1、每處錯(cuò)誤及其修改均僅限一詞；2、只允許修改10處，多者（從第11處起）不計(jì)分。MyparentsdecidedtomakeatriptoBeijing、Whentheytoldmetheirdec