云南省昭通市水富市云天化中學2025屆高考全國統(tǒng)考預測密卷英語試卷含解析

云南省昭通市水富市云天化中學2025屆高考全國統(tǒng)考預測密卷英語試卷注意事項1．考試結(jié)束后，請將本試卷和答題卡一并交回．2．答題前，請務(wù)必將自己的姓名、準考證號用0．5毫米黑色墨水的簽字筆填寫在試卷及答題卡的規(guī)定位置．3．請認真核對監(jiān)考員在答題卡上所粘貼的條形碼上的姓名、準考證號與本人是否相符．4．作答選擇題，必須用2B鉛筆將答題卡上對應選項的方框涂滿、涂黑；如需改動，請用橡皮擦干凈后，再選涂其他答案．作答非選擇題，必須用05毫米黑色墨水的簽字筆在答題卡上的指定位置作答，在其他位置作答一律無效．5．如需作圖，須用2B鉛筆繪、寫清楚，線條、符號等須加黑、加粗．第一部分（共20小題，每小題1.5分，滿分30分）1．---DidyouwatchthefinalmatchofChinaOpenyesterday?---Sure.IitsoattentivelythatIforgottocooksupper.A．watchedB．hadwatchedC．waswatchingD．wastowatch2．—WouldyoupleasewaitforamomentwhileItelephonethereceptiondesktocheck?—________.A．Iwouldn'tmindthat B．SoundlikefunC．Imeanit D．Youwish3．–Let’stakeacoffeebreak,shallwe?–IwishI________,butIhaveareallytightschedule.A．can B．shall C．could D．should4．---ItwasSundaytoday,andI_______upveryearly.---Soyoureallyhadagoodrest.A．didn’tneedtoget B．needn’thavegot C．needn’ttoget D．don’tneedget5．—Whatdidhedoinreturnforfree________andfoodofferedbythekindcouple?—Hehelpedtheirsonwithhislessons.A．conservation B．a(chǎn)dmissionC．a(chǎn)ccommodation D．immigration6．MaybesomeofyouarecuriousaboutwhatmylifewaslikeonthestreetsbecauseI’veneverreallytalkedaboutit______.A．inplace B．inturn C．inforce D．indepth7．Mymotheropenedthedrawerto______theknivesandspoons.A．putaway B．putup C．puton D．puttogether8．Youcanneverbe________whencrossingthestreet.A．verycareful B．toocareful C．carefullyenough D．enoughcareful9．______whathadhappened,theyknewIwouldstruggleandsimplywantedtohelpbecauseitwastherightthingtodo.A．Hearing B．Tohaveheard C．Havingheard D．Heard10．Roberthadacomfortablechildhood,______upinapleasanthousewithaviewofthesea.A．grew B．growingC．grown D．togrow11．--Ifeelnervouswhentakinganexam.--andyoucandoitwell.A．TakeitweasyB．TakeyourtimeC．GoodluckD．It’suptoyou12．PleasewearyourbestclothesonMonday,asyourclassphotos______then.A．willtakeB．willbetakenC．havetakenD．havebeentaken13．––Youseemtobefamiliarwiththiscity.—I______hereforthreeyears.It’ssogreattobeback.A．livedB．hadlivedC．havelivedD．live14．Manynetizensareimpressedwiththeexcusegivenbyateacherforquittingherjob______sheowestheworldavisit.A．because B．that C．where D．why15．Tomisproudand________,neveradmittingheiswrongandalwayslookingforsomeoneelsetoblame.A．strict B．stubbornC．sympathetic D．sensitive16．Hawkingbelievestheearthisunlikelytobetheonlyplanet_____lifehasdevelopedgradually.A．that B．whyC．where D．whose17．—I'msorry.Ishouldn'thavebeensorudetoyou.—You________somethingnotverynicetome,butthat'sOK.A．havesaidB．hadsaidC．weresayingD．didsay18．Thescientistdoesnotstudynature________itisusefultodoso.Hestudiesitbecausehetakespleasureinit.A．until B．becauseC．though D．unless19．F/friendshipsfadeawayifthereisn’t___goodbalancebetweenthegiveandthetake．A．The;/ B．/;a C．The;a D．/;the20．IfI_____itwithmyowneyes,Iwouldn’thavebelievedit.A．didn’tsee B．weren’tseeingC．wouldn’tsee D．hadn’tseen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四個選項中，選出最佳選項。21．（6分）YoungpeopleintheUnitedStatesdonothaveastrongunderstandingoftheworldandtheirplaceinit.TwoU.S.—basedgroups,theCouncilonForeignRelationsandtheNationalGeographic,Societycommissionedanonlinesurveyearlierthisyear.TheywantedtoknowwhatyoungpeopleeducatedinAmericancollegesknewaboutgeography,U.S.foreignpolicy,recentinternationalevents,andeconomics.Thesurveywasgiventoover1,200Americansbetweentheagesof18and26years.Allofthempresentlyattending,orhavingpreviouslygraduatedfrom,a2-or4-yearcollegeoruniversity.Theaveragetestscore,outof75totalpossibleanswers,was55percent.Thestudyidentifiesafewimportantproblems.Forexample,only30percentknewthattheonlypartoftheU.S.governmentthatcandeclarewarisCongress.Only60%ofthosetakingthesurveycouldidentifyBrazilonaworldmap.Partoftheproblem,arguetheorganizersofthesurvey,istheinternet.Theysayitisbecominghardertofindhigh-qualityinformationaboutworldeventsamongstallthefakenewsandtriviawhichswamptheweb.Forty-threepercentofthosequestionedsaidtheyreadaboutthenewsonFacebook.Anotherproblemisthatmostcollegecoursesdonotrequirestudentstolearnaboutinternationalissues.Ifsuchinformationisnotrequired,RichardHaassfromtheCouncilonForeignRelationssaid,thentheUnitedStatescouldhaveleaderslikeGaryJohnson.HewasarecentpresidentialcandidatewhodidnotknowabouttheSyriancityofAleppowhenareporteraskedhimaboutit.Thesurveyresultswerenotallbad.Theyoungpeoplealsodemonstratedagoodunderstandingofclimatechangeandrenewableenergy.Andthemajorityofthemsaidthatinternationalissueswerebecomingmoreimportanttothem.Haasssaysthesefindingssuggesttheneedtofindwastogetgoodinformationtostudents,bothinschoolandonline.Tohelp,theCouncilonForeignRelationsiscreatinganewprogramcalledCFRCampus,designedtohelpbuildknowledgeaboutglobalissues.1、Whatcanwelearnaboutthesurvey?A．AlltheparticipantswererecentuniversitygraduatesB．ItwasanonlinesurveyconductedbytwoUSuniversitiesC．ItsaimistofigureoutwhattheyoungpeopleknowaboutAmericaD．Itwasgiventoover1,200Americanpeopleagedfrom18to262、What’sonereasonsurveyorganizersgiveforyoungpeople’slackofknowledge?A．YoungpeopleareunwillingtotravelabroadB．ThesourcesfromwhichtheygettheirinformationC．TheUSuniversitysystemisofpoorqualityD．Theirlackofinterestinknowingmoreabouttheworld3、Accordingtothesurvey,whattopicdidtheyoungAmericansunderstandbest?A．EnvironmentalmattersB．GeographicinformationC．ForeignrelationsD．Governmentorganizations4、Inwhichcolumnofanewspapercouldwefindthisarticle?A．EconomicsB．EntertainmentC．PoliticsD．Education22．（8分）Unlessyou’reveryyoungorveryold,it'slikelyyouhavesomekindofrelationshipwithemail,whetheryougethundredsofmessagesadayorafewdozenaweek.Anewstudysuggeststhathowwedealwiththeseincomingmessagescouldbeaffectingourstresslevelsandoverallhealth.AteamfromtheFutureWorkCentreintheUKsurveyed2,000peopleacrossvariousindustries,sectors,andjobroles,askingparticipantshowtheymanagedtheiremailandhowmuchassociatedstresstheyfeltasaresult.Overall,thosewhospentthemosttimeorganisingandstayingontopofmessagesfeltthemostemail-relatedpressuretoo.“Whileemailcanbeavaluablecommunicationtool,it’sclearthatit’sasourceofstressoffrustrationformanyofus.Thepeoplewhoreporteditbeingmostusefultothemalsoreportedthehighestlevelsofemailpressure!”saidoneoftheteam,RichardMacKinnon.Twoofthehabitslinkedtomoreemail-relatedstresswerecheckingformessagesfirstthinginthemorningandlastthingatnight.Halfofthosesurveyedhadpushnotifications(消息推送）setupfornewemail,while62percentofrespondentslefttheiremailappopenalldayandallnight.Bothwerelinkedtohigherlevelsofemailpressure.Thesurveyalsofoundthatmanagerssufferedmorethannon-managers.Stressisnotjustaproblemwhenitcomestoourmood—it’sbeenlinkedtoalotofdisorderssuchasheartdisease，weightgain，memoryimpairment(減弱），digestiveproblems,anddepression.Theresearcherssuggestthattherelationshipbetweenemail-relatedstressandthenegativeimpactonhomelifeisnotthesameforeveryone.1、What’sthepurposeofthestudy?A．Tofindouthowmanypeoplehaveanemailaccount.B．Toknowwhatsortofpeopleuseemailmost.C．Tofindouthowemailmanagementisrelatedtostress.D．Toshowwhatchangesemailhasbroughtabouttopeople.2、WhatdoesRichardMackinnonthinkofemail?A．Itbringsmorestrengths. B．Itisnotanessentialtool.C．Itisadouble-edgedsword. D．Itmakespeoplepuzzled.3、Whichofthefollowinghabitscausesthemoststress?A．Checkingemailinthemorning.B．Checkingemailintheevening.C．Keepingemailappopenatwork.D．Settinguppushnotificationsfornewemail.4、Wheredoesthetextmostprobablycomefrom?A．Sciencefiction. B．Asciencereport.C．fashionmagazine. D．Abookguide.23．（8分）Ifhumanspumpenoughcarbondioxide(CO2)intotheatmosphere,thestratocumulusclouds(層積云)coulddisappear,andtheearth'stemperaturecouldclimbsharplytoheightsnotpredictedincurrentclimatemodels.Itwouldburntheplanet.That'stheconclusionofapaperpublishedinthejournalNatureGeoscienceanddescribedindetailbyNatalieWolchoverforQuantaMagazine.AsWolchoverexplained,cloudshavelongbeenoneofthegreatuncertaintiesofclimatemodels.Computermodelsthateasilycapturethecomplexityanddetailofmostclimatesystemsjustaren'tpowerfulenoughtopredictworldwidechangesincloudbehavior.Butcloudsareimportant.Theyreflectsunlightawayfromtheearth'ssurface.Andstratocumuluscloudsarethosewhiteblanketsyoumighthaveseenasyoulookedoutthewindowofarmairplane,rollingoutbelowyouandhidingthegroundResearcherssuspectthatcertainsudden,pastjumpsintemperaturemayhavebeencausedbychangestocloudslikethese.Forthenewresearch,scientistsmodeledjustasmallpatchofskyusingasupercomputer.Theyfoundthatifcarbondioxidelevelsreachabout1,200partspermillion(ppm)intheatmosphere,stratocumuluscloudsbreakup.That'saveryhighcarbondioxideconcentration.Rightnow,levelshaveclimbedpast410ppm--adangerouschangefrom280ppmbeforetheIndustrialRevolution.ButhumansputmoreandmoreCO2intotheatmosphereeveryyear.Ifcurrenttrendscontinue,theearthcouldreach1,200ppmwithin100to150years.Thiscouldhappenifoursocietydoesn'tfollowthroughonanyofitscommitmentstoreduceemissions(排放),Wolchoverreported.Andevenifitdoes,theresultwouldbeanother8degreesCelsiusofheataddedtotheglobalaverage,ontopofthedangerouschangesalreadyunderwayduetogreenhousegases.That’sanenormouschange,anditgoesbeyondpredictionsofworldwideicemeltandcatastrophicsealevelrise.And,oncethestratocumuluscloudsaregone,Wolchoverreported,theylikelywouldn'treappearuntilatmosphericcarbondioxidelevelsdroppedbelowwheretheyarecurrently.There'sstillsomeuncertaintyinthedata.The1,200ppmfigurecouldchangeasscientistslookintotheissuefurther.1、Whatcanwelearnfromparagraph2?A．Mostclimatesystemsarenotcomplex.B．Cloudbehaviorisuncertainandhardtopredict.C．Temperaturechangesaffectthestratocumulusclouds.D．Thestratocumuluscloudsprotectplanesfromsunlight.2、Howdidthescientistsstudycloudsinthenewresearch?A．Bymeasuringthesealevel.B．Byexperimentinginanaturalstate.C．Bycomparingclimatemodels.D．Bycomputermodelingandanalyzing.3、Whatdoes"it"refertoinparagraph4?A．Theatmosphere.B．Theearth.C．Oursociety.D．Theresult.4、WhichofthefollowingstatementswouldWolchovermostprobablyagreewith?A．TheeffectsofCO2emissionshavebeenfullyassessed.B．Thestratocumuluscloudswon'treturniftheyaregone.C．Thebreakupofstratocumuluscloudscouldresultincatastrophes.D．OnceCO2levelreaches1,200ppm,stratocumuluscloudswillgoextinct.24．（8分）InastudypublishedintheU.S.journalScience,researchersfromtheChineseAcademyofAgriculturalSciences(CAAS)andtheUniversityofFloridaidentifiedthechemicalcombinationsandgeneticrecipeforbettertomatoflavor(味道).“Inrecentyears,consumersoftencomplainthatthemoderntomatoislessflavorfulthanitoncewas”saidco-principalresearcherSanwenHuang.“Ourresultsprovideapracticalroadmapforbreedingtomatovarietieswithbetterflavor.”Forthestudy,a170-personconsumergroupwascreatedtoevaluate160tomatoesrepresenting101varieties,basedonqualitiessuchas“overallliking”and“flavordegree”.Theresultspointedtodozensofchemicalcompoundsofinterest,andfurtherresearchusingastatisticalmodeldiscovered33flavorcompoundsconnectedwithconsumerliking,suchasglucose(葡萄糖).Thereasonwhymoderntomatoesdon’ttastegoodanymoreisthatatotalof13oftheseflavor-associatedcompounds“weresignificantlyreducedinmodernvarieties,”theirpaperwrote.Moreover,theresearchersfoundthatsmallerfruittendedtohavegreatersugarcontent,suggestingthat“selectionformoresizabletomatoeshascostsweetnessandflavor”.Basedonthisknowledge,HuangandProfessorHarryKleeoftheUniversityofFloridastudiedthewholegenomesof398varietiesoftomato,identifyingabout250positionsofgenesonachromosome(染色體),whichcontrolledtomatoflavor.“We’rejustfixingwhathasbeendamagedoverthelasthalfcenturytopushthembacktowheretheywereacenturyago,”saidKleeinastatement.“Wecanmakethesupermarkettomatotastenoticeablybetter.”Kleesaidnewtomatovarietieswithbetterflavorcouldbereadyinthreetofouryears.Inaddition,“thegenesandpathwaysidentifiedhereinthetomatoalmostcertainlypointtopathwaysworthresearchingforimprovementofflavorqualityinotherfruitcrops,”theywrote.1、Accordingtothetext,thestudy________.A．wascarriedoutjustthroughasurveyB．wasconductedbyChineseresearchersthemselvesC．wascompletelyfocusedonthegenesofdifferenttomatoesD．wasdonewiththebackgroundofdecliningflavoroftomatoes2、Theresearchershavefoundthat________inthestudy.A．biggertomatoesaremuchsweeterB．somegeneticpositionsaffectthetasteoftomatoesC．somechemicalcompoundsmaketomatoeslesstastyD．a(chǎn)totalof13flavor-associatedcompoundsmaketomatoesappealingintaste3、Whatistheinfluenceofthestudyaccordingtothetext?A．Thestudylaysthefoundationforfurtherresearchestoimproveotherfruitcrops’flavor.B．Thestudymakesitpossibleforustohavenoticeablymoretastytomatoesnextyear.C．Thestudyprovidesaroadforwheretoplanttomatoeswithbetterflavor.D．Thestudyhasfixedallthegenesofexistingtomatoes.25．（10分）MyFirstDayofSchoolFearstartedtakingover,IwaswalkingintomyfirstschoolinAmerica.IhadtraveledalongdistancefromIndiainordertojoinmyparents,whohadbeenforthreeyears,hopingAmericawouldhelpmyfuture.MyfatherdecidedthatIwouldbebetteroffgoingtoschoolhere,soIenrolled(登記)inthelocalhighschoolinmynewtown.IwasafraidhowIwoulddo.Onthefirstday,IwenttomysecondperiodclassafterIhadmissedmyfirst.Withanxiety,Ireachedforthedoor,openingitslowly.Withoutpayingattentiontomyclassmates,Iwentstraighttotheteacherandaskedifthiswastherightclass.Withasoftvoiceheanswered.“Yes.”Hisvoicecomfortedmealittle.HegavemeasheetcalledCourseRequirements,whichIwouldnevergetinIndiabecausewedidn’thaveanythinglikethat.ThenheaskedmetochoosewhereIwouldsit.Ididn’tactuallywanttopickaseat.InIndiawehadfixedseats,soIneverneededtoworryaboutthat.Ispenttherestoftheclasstakingnotesfromtheimageproducedbytheoverheadprojector.InIndianschools,wedidn’tusethetechnologywehad.Wehadtotakenotesastheteacherspoke.Itwasnoon.IwasveryconfusedaboutwhenIwouldhavelunch.IwenttomynextclassandthebellrangasIentered.IwentthroughtheregularprocessofaskingtheteacherifIwasintherightclass.Shesaid,“It’sstillfourthperiod.”“Butthebelljustrang,”Isaid.Changingfromagentletonetoaharsher(刺耳的)one,shesaid,“Thatisthelunchbell,youngman.”Iapologized.WithoutanotherwordIheadedforthecafeteria.Ifeltluckybecausewedidn’thavethisinIndia.EveryconfusionseemedlikeabarrierIhadtogetthroughtoreachmygoal.Attheendoftheday,Iwasonmywaytothebuswhichwedidn’thaveinIndiaeither.Ispottedmybusandsatdowninsidehappily.Iwasthinking,todaywasn’tobad.1、TheauthorattendedanAmericanhighschoolbecause_______.A．hisfatherpreferredAmericanschoolsB．hisfamilywantedhimtohaveabrightfutureC．hismotherhadworkedinitfor3yearsD．hehadbeenlongingtoleavehishomeland2、Whatdoweknowabouttheauthor'sfirstdayofschool?A．HewenttothewrongclassforthesecondperiodB．HemetsomeenthusiasticteachersandclassmatesC．HegottheCourseRequirementssheetfromhisclassmateD．HeexperienceddifferencesfromtheIndianschoolsinmanyways3、Howdidtheauthorfeelattheendoftheday?A．Worried B．PuzzledC．Relieved D．Excited第三部分語言知識運用（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四個選項中，選出可以填入空白處的最佳選項．26．（30分）Teachingsecondgradeisalwaysadifficultjob.Eachstudentarrivesatschoolwithhisownneedsanddifficulties.Oneyear，astudentcalledBilly1mewithhisbehavioraswellashisacademicrequirements.Hestruggleddailywithhis2emotionsandoftenbecameangryorviolent.Iknewthat，tomake3progress，hisemotionsneededcontrolling.One4ItriedtohelpBillywastohavehimcomedirectlyintotheclassroomwhenhearrivedatschool.Billy'smomwould5metoalert（提醒，告知）metoaparticularlyemotionalmorningathome.Then，Iwouldfocuson6hisangerandcalminghimdownbeforetheotherstudentsarrived.Oneweekourclasswasstudying7IthoughtthatonewaytobringlearningintotheclassroomwastobringmydogRockytoschoolfortheday.Thatdaybeganasnormal.Iwaspreparingactivitiesfocusedondogthemes8IwastoldonthephonethatBillyhada9morningathomeandImightneedtogethim10AsIwastalkingtohismom，Billy11intotheclassroom.ToBilly's12，Rockyimmediatelyranuptohisnew13，wagginghistailandlicking（舔）Billy'sfacewithdoggyaffection（喜愛）.Billycouldn't14Rocky'scharmandbeganlaughingashisangermeltedaway.Throughouttheday，BillyneverleftRocky'sside，feedinghim，beinggentlewithhimandeven15theotherstudentswhileRockywassleeping.Billywasknownfordoinganythinghecouldtoavoid16，butonthisdayhefoundagooddogstory，Clifford'sPuppyDays，andreadittoRocky.How17IwasatthesightofBillyreadinghappily！Mylittledogwasableto18Billy'sdayfromoneofangerandfrustrationtooneoflaughter，gentlenessand19.ThatdayRocky20helpedmewithmyteaching；hehelpedtochangethelifeofachild！AfterthatBilly'sbehaviordefinitelyimproved.1、A．challenged B．cheated C．benefited D．betrayed2、A．unforgettable B．uncontrollable C．unconscious D．unfortunate3、A．physical B．mental C．a(chǎn)cademic D．healthy4、A．a(chǎn)dvantage B．a(chǎn)genda C．reason D．way5、A．wake B．call C．visit D．sign6、A．tolerating B．observing C．relieving D．ignoring7、A．emotions B．pets C．plants D．diet8、A．a(chǎn)fter B．while C．when D．before9、A．boring B．fantastic C．busy D．rough10、A．settled B．punished C．treated D．excited11、A．fled B．stormed C．jogged D．wandered12、A．surprise B．delight C．shame D．fear13、A．protector B．trainer C．friend D．owner14、A．resist B．describe C．reduce D．forget15、A．educating B．envying C．comforting D．quieting16、A．exploding B．reading C．a(chǎn)rguing D．a(chǎn)pologizing17、A．surprised B．disappointed C．a(chǎn)mused D．confused18、A．urge B．shorten C．transform D．expand19、A．a(chǎn)dmiration B．curiosity C．a(chǎn)nxiety D．love20、A．otherthan B．morethan. C．ratherthan D．betterthan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個適當?shù)膯卧~或括號內(nèi)單詞的正確形式。27．（15分）Onlineshoppingiscomingintofashioninmostcities,wherepeopleareabletomakefulluseoftherapidly-developedInternettechnology.Nowadays,canwefindaperson1．hasn’texperiencedonlineshopping?Definitelynot.Onlineshopping2．(welcome)bymostpeopleduetovariousreasons.Fromtheperspective(視角)oftheconsumer,itcansavesometimeforpeoplewhodon’thavemuchsparetime.Justclickthemouse,theycanget3．theywantwhilestayingathome.Fortheretailers(零售商),itcancutsomecostsforthosewhodon’thavemuchcirculatingfunds.4．(compare)withthetraditionaltrademode(風格),itsavesthemtheneedtorentahouse.5．，therearestillsome6．(disadvantage)inonlineshopping.First,noface-to-facedealmakesonlineshoppinglessreliableandtrustworthy.Second,peoplewilllosethefunofbargaining.7．isundeniable(不可否認的)thatshoppingontheInternethasbecomeanirresistible(無法抗拒的)trendinmodern8．(social).It’sofgreaturgencythatweneedtomaketherelativelawswiththerapid9．(grow)ofonlineshopping.Onlyinthiswaycanweenjoythepleasureandconvenienceofonlineshoppingwithouttheconcernof10．(cheat).第四部分寫作（共兩節(jié)）第一節(jié)短文改錯（滿分10分）28．（10分）假定英語課上老師要求同桌之間交換修改作文，請你修改你同桌寫的以下作文。文中共有10處語言錯誤，每句中最多有兩處。每處錯誤僅涉及一個單詞的增加、刪除或修改。增加：在缺詞處加一個漏字符號（∧），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：在錯的詞下劃一橫線，并在該詞下面寫出修改后的詞。注意：1.每處錯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）不計分。Today,millionsofpeoplewantlearnorimprovetheirEnglish.Whichisgood,tostudyinBritainorinyourowncountry?ThebenefitsofgoingtoBritainseemsobvious.Youwilllistentothelanguageallthetime,surroundcompletelybythelanguagewhereveryouwouldgoandhavetospeakEnglishifyouarewiththelocalpeople.InChina,thereisalwayspossibletospeakChineseinclassandthelearningisslower.However,therearealsoadvantageofstudyingathome.Youdon’thavetomakebigchangestoyourlife.Beside,it’smuchcheaperthangoingtoBritain.Inmyview,formostpeoplewithoutenoughmon