北京市昌平区实验中学2024年高考英语四模试卷含解析

北京市昌平区实验中学2024年高考英语四模试卷注意事项:1．答题前，考生先将自己的姓名、准考证号码填写清楚，将条形码准确粘贴在条形码区域内。2．答题时请按要求用笔。3．请按照题号顺序在答题卡各题目的答题区域内作答，超出答题区域书写的答案无效；在草稿纸、试卷上答题无效。4．作图可先使用铅笔画出，确定后必须用黑色字迹的签字笔描黑。5．保持卡面清洁，不要折暴、不要弄破、弄皱，不准使用涂改液、修正带、刮纸刀。第一部分（共20小题，每小题1.5分，满分30分）1．—Guesswhat!Icameacrossanoldfriendatthestationlastweekend.—I’msureyoutalkedwithhimhappily.A．Soundsgood! B．Verywell.C．Hownice! D．Allright.2．IbrokemyrelationshipwithPeterbecausehealwaysfound_______withme.A．errorB．failureC．mistakeD．fault3．Hedoesn'tspendanymoremoneyonclothingthanIdo,but________hemanagestolooksostylish.A．therefore B．somehowC．furthermore D．otherwise4．Intimewereachedastagewehadmoreyoungreadersthanoldones． A．where B．how C．who D．what5．---Whereisyournewhomenow?---Inthenewdevelopedzone.ButI______downtownforfiveyears.A．lived B．hadlivedC．havelived D．wasliving6．Thedocumentfilm______nextweekaimsatintroducinglocalculturestotheworld.A．released B．beingreleasedC．tobereleased D．havingbeenreleased7．Theclassroomisbigenoughfor25studentsfornormaluseyouneedmorespaceforspecialactivities.A．once B．because C．if D．unless8．Hisstrongsenseofhumorwasmakeeveryoneintheroomburstoutlaughing.A．soastoB．suchastoC．sothatD．suchthat9．Consideredtobealessdangeroustotobacco,"e-cigs"aretakingovertheWestasmoreandmorepeopleswitchoverwhentryingtokickthehabit.A．adjustment B．alternativeC．advertisement D．amusement10．TherecentlyreleasedfilmKong：SkullIslandsuccessfully________theaudiencetotheadventurewithDolby3-Dtechnology.A．transportsB．adjustsC．transformsD．relates11．Moreandmorecollegegraduates,thesurveyshows,feelithardtofindasatisfactoryjob.A．what B．who C．as D．that12．He’squite_________,butIcan’timaginehimaspresidentofsuchalargelistedcompany.A．enthusiasticB．generousC．competentD．sympathetic13．Wemust______thetimethatyou’vewastedthisafternoonbyworkinglateto-night.A．makeupfor B．makeout C．doup D．makeupto14．Nicholaswasverykind,mercifulandgenerous.Thisis________FatherChristmasisbasedon.A．where B．how C．what D．why15．________they’vemanagedtogeteverythingfinishedsoquicklyisnotcleartous.A．WhichB．WhatC．ThatD．How16．Shewasina________conditionafterthehearttransplantoperationwhenherbodyrejectedtheforeignorgan.A．skeptical B．critical C．theoretical D．practical17．Beinghappyisaskillthatcanbelearned,andonewayto________ourselvestobehappyistowritedownthelittlethingsthatcheerusupeachday.A．convey B．appeal C．train D．attempt18．MichelleObamawearsclothesthatanyonecanbuyinamalland________shemayhavealargereffectonconsumersthanordinarymodels.A．furthermore B．otherwise C．nevertheless D．therefore19．People________withanyonewhoisalwaystalkingabouthowwonderfulheis.A．fallin B．keepcompany C．catchup D．getfedup20．——HowdidyoufindyourtriptoWaterParkinthesummerof2016?——Ithoroughlyenjoyedit.Itwas________thanIexpected.A．evenmuchinteresting B．farmoreinterestingC．sofarinteresting D．farfrominteresting第二部分阅读理解（满分40分）阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。21．（6分）Theminuteyoustarttalkingaboutwhatyou’regoingtodoifyoulose,youhavelost.Somepeoplehaveagreatfearoflosing.Infact,fearisnotthebestdescriptionofwhattheyhave.Itismorelikeacrazyphobia(恐惧症)thattheycannotkeepawayfrom.Dayafterday,thesepeopleallowtheirfearoflosingtocontroleverythingintheirlives.Theyaresoafraidoflosingthattheytrytokeepawayfromlosingwithoutconsideringthecostofdoingso.Whenthingsstarttogetoutofcontrol,fearbeginstocomein.Asthefearoflosingorgettinghurtoverwhelms(充溢)them,theyquicklylookforexcuses,ratherthanfightbackorfindawaytodealwiththeirfear.Theyneverrealizethatlosingisjustascommonaseatingandbreathing.Ifoneisgivenachoice,whowouldn’tpreferwinningoverlosing?Afterall,winningisexcitingandwinningiswhatlivingisallabout.Althoughwemighttryhardallthetime,we’renotgoingtowineverytime.Infact,mostofusaregoingtolosealotmoreoftenthanwewinand,believeitornot,it’snotallbad.Inordertomakethemostofourabilities，wehavetotakeriskseverynowandthen.Whenwetakerisks,wemightgetknockeddown,orevenknockedflat,butwitheachfailureandeachloss,wehaveanopportunitytogetbetterandgetclosertothelifeweexpect.1、Whichofthefollowingmightbethebesttitleforthepassage?A．TheBadEffectsofLosingB．MaketheMostofEverySuccessC．WeWinSomeandWeLoseSomeD．WinningIstheMainPurposeinLife2、Bysayingtheunderlinedsentence“Theyaresoafraid...”inparagraph2,theauthormeans.A．oneshouldavoidlosingbyusinganykindofmeansB．oneistooafraidtodealwithlosingproperlybyhimselfC．oneissoafraidoflosingthathecan’tstepforwardatallD．oneshouldmakeeffortstodealwithlosingratherthanavoidit3、Wecanknowfromthepassagethat.A．fearworksmostwhenoneiseagertowinB．losingisacommonpartofourdailylivesC．oneshouldavoidlosingwithoutconsideringthecostD．themorelosingoneexperiences,thestrongeronewillbecome4、Whatcanweinferfromthelastparagraph?A．Losingisofgreatvaluetosuccess.B．Themorewefear,thebetterwewillperform.C．Onlywhenweimproveourabilitiescanwewin.D．Onlythroughexperiencinglosingcanwegetwhatwewant.22．（8分）Couldthedevice,smartphoneorPC,whichyoureusingaffectthemoraldecisionsyoumakewhenusingit?Totestit,researcherspresentedmultipledilemmastoasamplesetof1,010people.Theparticipantswereassignedadeviceatrandom.Onecaseofthequestionsparticipantswereaskedistheclassic“trolley(有轨电车)problem”:Arunawaytrolleyisheadedtowardsfivepeopletiedupona-setoftraintracks.Youcandonothing,resultinginthedeathsoffivepeople,orpushamanoffabridge,whichwillstopthetrolley.Thepracticalresponseistokillonemantosavefivelives,which33.5percentofsmartphoneuserschose,comparedto22.3percentofPCusers.“Whatweroundinourstudyisthatwhenpeopleusedasmartphonetoviewclassicmoralproblems,theyweremorelikelytomakemoreunemotional,reasonabledecisionswhenpresentedwithahighlyemotionaldilemma,“DrAlbertBarque-Duran,theleadauthorofthestudy,toldCity,UniversityofLondon.“ThiscouldbeduetotheincreasedtimepressureoftenpresentwithsmartphonesandalsotheincreasedpsychologicaldistancewhichcanoccurwhenweusesuchdevicescomparedtoPCs.”Asforwhytheresearchersstartedthisstudy,DrBarque-Durannoted,“Duetothefactthatoursociallives,workandevenshoppingtakeplaceonline,itisimportanttothinkabouthowthecontextswherewetypicallyfacemoraldecisionsandareaskedtoengageinmoralbehaviorhavechanged,andtheimpactthiscouldhaveonthehundredsofmillionsofpeoplewhousesuchdevicesdaily.“it’sclearthatweneedmoreresearchonhowourdevicesaffectourmoraldecisionmakingbecausewe’reusingscreensataneverincreasingrate.1、Whydidtheauthormentionthetrolleyproblem?A．Tointroduceadifficultproblemtoreaders.B．Tointroducetheaimofcarryingoutthestudy.C．ToshowanexampleofthequestionsinthestudyD．Toshowthedifficultyindealingwithdilemmas.2、Howdothesmartphoneusersofthestudybehaveindealingwithemotionaldilemmas?A．Calmly.B．Cruelly.C．Hesitantly.D．Enthusiastically.3、DrAlbertbelievesthatcomparedwithPCs,smartphones.A．helppeoplebearmorepressureB．helppeoplemakedecisionsquickC．makepeoplefeelmorementallydistantD．makepeoplestayhappiertosolveproblems4、Whatcanweinferfromthetext?A．Shoppingonlinehasagreateffectonmakingmoraldecisions.B．ThepeopleusingsmartphonesaremorethanthoseusingPCs.C．PeoplewhooftenusesmartphonesorPCsalwaysmeetwithdilemmas,D．Itiscommonforpeopletobeinvolvedinmakingmoraldecisionsindailylife.23．（8分）WhatDoestheLengthofYourFingersSayAboutYou?Areyouthepeace-lovingtypeortheambitiousgo-getter?Yourfingerlengthmightbeaclue.Takealookatyourfingers.WouldyoubelievemeifItoldyouthatthelengthofyourfingersinrelationtooneanothercanpredictyourpersonality?IknowthatitsoundslikeoneofthosesillytestsyouseeonFacebook,butIhavetoadmitthatitisexactlycorrectforme.Here’showitworks.Lookatyourthreemiddlefingersofyourhand.Isyourindexfingerlongerthanyourringfinger?Isyourringfingerlongerthanyourindexfinger?Orarethetwoofthesamelength?Findthesituationthatbestmatchesyourhandandseeifwhatfollowsisanaccuratedescriptionofyourpersonality.Longerringfinger:TheSweetTalkerIfyourringfingerislongerthanyourindexfinger,researchshowsthatyou’relikelyacharmingtype,andyoucanprobablytalkyourselfoutofanysituation.Othersoftenfindthispersonalitytypeirresistibleandwillgotogreatlengthstohelpyou.You’remorelikelytotakerisks,andyou’regoodatproblem-solving.Peopleinthiscategorymakegreatengineers,soldiersandcrossword-puzzlesolvers.Longerindexfinger:The(Over)ConfidentOneIfyourindexfingerislongerthanyourringfinger,chancesareyouarefullofconfidence—possiblyeventothepointofbeingover-confidentandproud.Youarenotnecessarilyintroverted(内向的),butyoudoenjoytimetoyourself,especiallywhenyou’retryingtocompleteaproject.Youareadreampursuerwhocanmakethingshappen,butyoumaybeshywhenitcomestotakingthefirststepinarelationship.Youarealsoprobablyhappywithwhatyouhave,butyou’realwayswishingformore.Indexandringfingerareofthesamelength:ThePeacemakerIfyourindexfingerandringfingerareroughlyofthesamelength,youarelikelytoavoidconflictatallcostsandseektokeepthepeaceinyourrelationships.Youarewell-organized,faithfulandsympathetic.Butdeepdownunderallofthatcaringandpeace-loving,youalsohaveahot-temperedsidethatcanappearunexpectedlywhenyou’repushedtoofar.Youwilltryyourhardesttoavoidafight.Howwelldothesedescriptionsmatchyourpersonality?Iwassurprisedattheaccuracyinmycase,butI’mnotgoingtotellyouwhichoneitwas!1、Whichofthefollowinghandcouldbeanengineer’shand?A．B．C．D．2、Wecanlearnfromthepassagethattheauthor______.A．isverycharmingandhelpfulB．alwaystrieshardtoavoidafightC．oftentakessillytestsonFacebookD．thinksthedescriptionssuithimwell3、Whatdoesthepassageintendtotellus?A．Howaccuratethedescriptionofthetestis.B．Thelengthoffingerscanrevealpersonality.C．Whyyourfingersarenotofthesamelength.D．Personalityisdeterminedbyyourfingerlength.4、Wherecanyouprobablyfindthetext?A．Apopularmagazine.B．Anofficialreport.C．Apublicadvertisement.D．Abiologytextbook.24．（8分）AndthentherewerenineThepasttwodecadeshaveseenastronomers’catalogueofplanetsexpandovertwohundredtimes,asnewtechniquesandbettertelescopeshavefoundmorethan2,000ofthemorbitingstarsotherthanthesun.Butinthesolarsystemitself,thelistofplanetshasactuallyshrunk,Pluto（冥王星）havingbeendowngradedfromthatstatusin2006.Thenumberofthesun’splanetarycompanionshasthusfallenfromninetoeight.Now,apairofastronomersfromtheCaliforniaInstituteofTechnologythinktheyhaveevidencethatwillrestorethesun’srecordtoitspreviousvalue.TheiranalysisofobjectsorbitingintheKuiperBelt（柯伊伯带）,aringoffrozenasteroids（小行星）thatcirclebeyondtheorbitofNeptune(andofwhichPlutoisnowregardedasthelargestmember),suggeststothemthatsomethingabouttentimesasmassiveasEarthhaschangedthoseorbits.Ifyouknewwheretolook,thisplanet-sizedobjectwouldbevisiblethroughasuitabletelescope.AndKonstaninBatyginandMichaelBrownbelievetheydoknow.AstheywriteintheAstronomicaljournal,theyhaveanalyzedtheorbitsofKuiperBeltobjectsandfoundsixthatbehaveinapeculiarway.Asthediagramshows,thepointsofclosestapproachoftheseobjectstothesun,knownastheirperihelia（近日点）,almostcoincide.Moreover,theseperiheliaalllieneartheecliptic（黄道）---theplaneofEarth’sorbitandalso,approximately,thatoftheotherplanets---whiletheobjects’orbitsareallangledat30°belowtheecliptic.Thechanceofallthisbeingacoincidence,thetworesearchersestimate,isaboutsevenin100,000.Ifitisnotacoincidence,itsuggeststhesixobjectshavebeenguidedintotheirorbitsbythegravitationalinterventionofsomethingmuchlarger.AcomputeranalysisDrBatyginandDrBrownperformedsuggeststhissomethingisaplanetweighing5-15timesasmuchasEarth,whoseperihelionisontheoppositesideofthesunfromthecluster,andwhichthusorbitsmainlyontheothersideofthesolarsystemfromtheobjectsitsorbithasaffected.Thisplanet’sperihelionwouldbe200timesfartherfromthesunthanEarth’s,andthefarendofitsorbitmightbeasmuchassixtimesthatdistanceaway.Thisgivesasearchzone,andDrBatyginandDrBrownareusingSubaru,aJapanesetelescope,toperformthatsearch.GivenotherdemandsonSubaru’stime,itmighttakefiveyearsforthissearchtofind(ornotfind)thehypotheticalplanet.Butlookingatsomeexistingdatafrom.TheWidefieldInfraredSurveyExplore,asatellite,mightalsoshowit,ifitistheretobeseen.Ironically,itwasDrBrownasmuchasanyonewhowasresponsibleforPluto’sdowngrading,forhediscoveredEris,anobjectalmostasbigasPluto,in2005.ThatdiscoverydidmuchtodamagePluto'splanetaryproof.Byhisownadmission,hewasskepticalthattheanomaliesheandDrBatyginhaveinvestigatedactuallywouldpointtotheexistenceofareplacementninthplanet.Heisaskepticnolonger.Whetherheisactuallyrightmaysoonbecomeapparent.1、AccordingtoDrBatyginandDrBrown’sresearch,itisquitepossiblethat________.A．PlutowillrestoreitsstatusasaplanetofthesolarsystemB．thesixobjectsintheKuiperBeltsharingsomesimilaritiesisamerecoincidenceC．therearenineplanetsinthesolarsystemD．Erisisareplacementninthplanetofthesolarsystem2、WhichofthefollowingisNOTtrueaboutthehypotheticalplanet?A．ItmayhavechangedtheorbitsofsixobjectsintheKuiperBelt.B．Youcanseeitthroughadomestictelescopeifyouknowwheretolook.C．Comparedtoearth,thedistancefromitsperiheliontothesunisabout200timeslarger.D．Asatellitemaybeabletoprovidesomeevidenceofitsexistence.3、Whatdoestheunderlinedwordanomaliesstandfor?A．Sixobjectsbehavinginapeculiarway.B．Pluto’sdowngrading.C．ThediscoveryofEris.D．Someexistingdata.4、Thepurposeofthethirdparagraphisto________.A．explainwhythescientistsbelievethereisanunfoundplanetB．showhowthescientistsanalyzetheorbitsofKuiperBeltobjectsC．tellusthattheperiheliaofthesixobjectsalmostcoincideD．introducethetwoscientists’articleintheAstronomicalJournal25．（10分）Lastmonth,votersinthesecondCongressionalDistrictinNewOrleans,Louisiana,madeahistoricchoice.TheyelectedAnh"Joseph"CaoaVietnamese-AmericanRepublicanpartymember,astheirrepresentative.ItisthefirsttimeinoveronehundredyearsthatvotersinthisareaofNewOrleanselectedanon-democraticPartylawmaker.And,AnhCaoisthefirstVietnamese-AmericantobeelectedtotheUnitedStatesCongress(议会).AnhCaowentthroughdifficulttimestogettowhereheisnow.HewasborninSaigoninnineteensixty-sevenduringthewarinVietnam.Innineteenseventy-five,NorthVietnamesetroopstookcontrolofSaigon.Hewasseparatedfromhisfamilyformanyyears.AnhCaolivedwithhisuncleinIndian,thenlatermovedtoHouston,Texas.Hedecidedtoworkforsocialjusticeinanon-religiousway.So,heworkedasalawyerinNewOrleans.HejoinedtheRepublicanPartyandbecameactiveonlocalandstatepoliticalcommittees.HedecidedtocompeteagainsthislocalrepresentativeinCongress,WilliamJefferson,whohadbeeninofficesincenineteenninety-one.MinisterJefferson'sreelectioncampaignwasnothelpedbyfederalcorruptionchargesagainsthim.MisterCaowontheelection.Thatnighthesaidthatneverinhislifedidhethinkhecouldbeacongressman.HesaidtheAmericandreamisaliveandwell.1、Whichstatementaccordingtothisnewsistrue?A．Anh“Joseph”CaowaselectedaVietnamese-AmericanDemocraticpartymember.B．ItisthefirsttimeeverthatvotersinthisareaofNew-Orlearishaveelectedanon-DemocraticPartymemberC．ThefirstVietamese-AmericanelectedtotheUnitedStateCongressisAnhCao.D．AllthevotersinUSAmadeahistoricchoice.2、WhichdescriptionaboutAnh"Joseph"Caoistrue?A．AnhCaowentthroughdifficulttimestogettheachievementnow.B．Hewasborninnineteensixty-seven.'C．Hewasseparatedfromhisfamilyformanyyears.D．Alloftheaboveareright.3、Whichcanbeinferredfromthepassage?A．Anh"Joseph"wasborninVietnam.B．ThelawmakersinthisareaofNewOrleansusedtobedemocraticforoveracentury.C．Anh"Joseph"determinedtocooperatewithWilliamJefferson.D．AlltheCandidatesinNewOrleansalwayssupportedWilliamJefferson第三部分语言知识运用（共两节）第一节（每小题1.5分，满分30分）阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项．26．（30分）In1988,Ibegantoworkasaflightattendant.1mywingswasmychildhooddreamthatIhadsetformyselfaftermyfirstplanerideattheageoffive.Likesomanyothersbeforeme,Ifellinlovewiththeromanceofairplanesand2others.Ihaveflownhundredsofflightssincegraduation,butone3amongthem.WewereflyingfromLosAngelestoWashington,D．C．,whenIfoundayoungmother4withherbaby.Everythingwasa5,andthemothertoldmethatshehadnomorediapers(尿布)orother6ontheaircraft.Throughhertears,she7methattheyhadmissedtheirflightthe8nightinLosAngeles.Sinceshehadn’t9tomisstheflight,shewas10touseupmostofher11andwhatevermoneyshehadto12herselfandherbaby.Asshestoodinfrontofme,crying,Icouldseethehopelessnessonherface.I13rangtheflightattendantcallbuttonandaskedfor14fromtheotherflightattendants.Theybroughtclothtowelsfromfirst15toassistincleaningupbothmomandthebaby.Igaveherasweaterandapairofpants.AsshethankedmeforallIhaddoneshesaid16,“You’renottheflightattendant,butyou’reaskyangel.”Touchingmyflightattendantwings,she17,“Andthoseareyourangelwing.”ThoughIamnolongeraflightattendant,my“angelwings”are18ondisplayinmyoffice.AndeachtimeIseethem,Iam19ofthatyoungwoman,hersonandthe20thatshegavemeonthatspecialday.1、A．ProducingB．EarningC．ImaginingD．Designing2、A．callingB．rescuingC．helpingD．guiding3、A．goesawayB．comesupC．standsoutD．setsoff4、A．strugglingB．playingC．communicatingD．competing5、A．messB．mistakeC．trickD．joke6、A．friendsB．clothingC．fortuneD．babies7、A．suggestedB．persuadedC．informedD．confirmed8、A．previousB．dangerousC．extraD．remaining9、A．rememberedB．regrettedC．managedD．expected10、A．warnedB．likelyC．ableD．forced11、A．wealthB．foodC．suppliesD．souvenirs12、A．raiseB．teachC．supportD．defeat13、A．suddenlyB．actuallyC．immediatelyD．generally14、A．understandingB．adviceC．permissionD．assistance15、A．airportB．aidC．numberD．class16、A．patientlyB．quicklyC．eagerlyD．elegantly17、A．continuedB．explainedC．recalledD．repeated18、A．seldomB．stillC．evenD．just19、A．accusedB．approvedC．complainedD．reminded20、A．sceneB．excuseC．presentD．story第二节（每小题1.5分，满分15分）阅读下面材料，在空白处填入1个适当的单词或括号内单词的正确形式。27．（15分）Directions:Afterreadingthepassagebelow,fillintheblankstomakethepassagecoherentandgrammaticallycorrect.Fortheblankswithagivenword,fillineachblankwiththeproperformofthegivenword;fortheotherblanks,useonewordthatbestfitseachblank.Phone-surfingResultsinMorePurchasesLeavingyourmobilephoneathomewhenyougoshoppingcouldpreventmindlessoverspending,anewstudysuggests.ResearchfromtheUniversityofBathdiscoveredthatwhenpeoplearedistractedbytheirmobilesduringatriptothesupermarkettheirshoppingbills1．risebyanaverageof41percent.Attention-weakeningdevicesalsoencourageshopperstowanderalongmoreshelves,2．theycomeacrossmoreproducts.Inonestudy,294peopleagedbetween18and73atfourSwedishsupermarketsworeeye-trackingglassesthroughoutashoppingtriptomeasurewheretheywentand3．theylookedat.Theirreceiptswerethenused4．(assess)theirspending.Thoseusingamobilephonespentonaverage£33.73comparedtoanaverageof£23.91forthosewhodidnot.Asecondstudyof117shoppersfoundthosewithmobilephonesspentlongerinthestore,5．(give)moreattentiontoshelves.Theyalsospentanaverageof£36.Thisstudyfoundshoppersusingamobilephonespentonaverage£36.16on20.85items,comparedto£25.59on13.22products.DrCarl-PhilipAhlbom,oftheUniversityofBath’sSchoolofManagementsaid:“Businessownershavetendedtoworrythatmobilesdistractshoppersfromspendingmoney,6．wewereamazedtofindcompletelythereverseeffect.”Thefindingswereveryclear-themoretimeyouspendonyourphone,themoremoneyyou’llpart7．.“Soifyou’retryingtobudget,8．(leave)yourphoneinyourpocket.It'snotthephone9．thatcausesmorepurchases,butitsimpactonourfocus.”Researchersbelievepeoplespendmorebecauseusingaphonedistractspeoplefromtheir10．(plan)lists.第四部分写作（共两节）第一节短文改错（满分10分）28．（10分）假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。增加：在缺词处加一个漏词符号(/\)，并在其下面写出该加的词。删除：把多余的词用斜线(\)划掉。修改：在错的词下画一横线，并在该词下面写出修改后的词。注意：1.每处错误及其修改均仅限一词;2.只允许修改10处，多者(从第11处起)不计分。OnJanuary5th,studentsinourschoolvisitedRobotWorld,whichwesawagreatdiversityofrobot.Itwasamazedtofindthoserobotsc