2023学年重庆市铜梁县第一中学高考仿真卷英语试卷（含解析）

2023学年高考英语模拟测试卷请考生注意：1．请用2B铅笔将选择题答案涂填在答题纸相应位置上，请用0．5毫米及以上黑色字迹的钢笔或签字笔将主观题的答案写在答题纸相应的答题区内。写在试题卷、草稿纸上均无效。2．答题前，认真阅读答题纸上的《注意事项》，按规定答题。第一部分（共20小题，每小题1.5分，满分30分）1．Newly-builtwoodencottageslinethestreet，___________theoldtownintoadreamland.A．turned B．turningC．toturn D．havingturned2．Thekitchenisoftenthebusiestroominahousehold,soit’simportanttomakesureitwell.A．smoothes B．functions C．pays D．measures3．Thisrestauranthasaninviting,homelikeatmosphere______manyothersareshortof.A．where B．whenC．that D．what4．Comehere,Mary.Ifyoustandatthisangle,you______justseethesunset.A．must B．needC．can D．should5．Astothe“996workschedule”,______employeesworkfrom9amto9pm,6daysaweek,People’sDailycommentedthatvaluinghardworkdoesnotmeanforcingemployeestoworkovertime.A．that B．which C．where D．when6．Sincethemiddleofthelastyear,thebike-sharingmarket_____inBeijing.A．boomedB．wasboomingC．willboomD．hasboomed7．Joinusandyouwilldiscoveranenvironment______youcanmakethemostofyourskillsandtalents.A．that B．whereC．how D．what8．Contrarytopopularbelief,theants,hardworking________theyare,havetheirtimeforplay.A．because B．while C．as D．where9．Luciaimpressedherpeerstudentswithhermusicaltalent,aswellasseveralforeignlanguages______.A．onherown B．underhercontrol C．inhercharge D．athercommand10．Goingoutis__________goodmeansofrelaxation.Wouldyouliketogoto______parkwithmeintheafternoon?A．the;the B．the;a C．a;the D．/；a11．______forthefreetickets,Iwouldnothavegonetoseefilmssooften.A．Ifitisnot B．HaditnotbeenC．Wereitnot D．Iftheywerenot12．Mywifesometimes_____somethingshehaslongbeenlookingfor.That’swhysheenjoyswindowshopping.A．looksup B．looksfor C．picksup D．picksout13．Touristsarerequiredto_________localcustomsandmindtheirmannerswhentravellingabroad.A．spot B．confirmC．observe D．spread14．—Iamwondering________makesyoustudysohard?—Togotomydreamuniversity.A．whatisitthat B．thatiswhatC．whatisthat D．whatitisthat15．Facingtheglobalfinancialcrisis,theChinesegovernmenthastakenmanymeasures________people'slifetodealwithit.A．related B．relatedtoC．relating D．relatingto16．Sarah______changehermind,eventhoughsheknewtheplanwashardtocarryout.A．mustn’t B．wouldn’tC．shouldn’t D．needn’t17．Mary_______towritingclasseseverynightsinceJuneandthecoursewillendthisweek.A．hadgoneB．hasbeengoingC．isgoingD．went18．Amancanfailmanytimes,heisarealfailurewhenhebeginstoblamesomeoneelse.A．butB．orC．andD．so19．—Whycan’tyougivemeanotherchance?—________,butIdon’tthinkyouaregoodatmanagement.A．NooffenceB．NoworriesC．NoneedD．Nowonder20．It'sthattimeofyearagain，whenAlipay______usjusthowmuchwe'vebeenspending，andonwhat．A．reminds B．remindedC．hasreminded D．isreminding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）OnNovember24,1868,ScottJoplinwasborninTexas.Hebecamefamousasaragtime(拉格泰姆音乐)composerandpianoplayer.Ragtimemusicwasanearlyformofjazz.ThismusichasalivelybeatandwasdevelopedfromthemusicofAfricanAmericans.Ragtimebecamepopularintheearly1890s,andthemusicwasplayedonthepiano.Thepianoplayerusuallymadeupamelody,thenchangeditalittlebiteverytimeheplayed.ScottJoplinwasverygoodatcomposing,ormakingupmusicandplayingthepiano.Whenhewasgrowingup,Joplin’shomewasfilledwithmusic.Still,Joplin’sfatherdidnotwanthimtobeamusician.Whenhewasabout14yearsold,Joplinlefthometotravelandstartalifeofhisown.HetraveledallovertheMidwestplayingthepianoandcomposingmusic.Sometimesheplayedwithmusicgroups.Othertimeshesangbyhimselfinnoisysaloonsandbars.In1899,JoplinwroteMapleLeafRag,aragtimesongthatbecameabighitandearnedJoplinthetitleofTheKingofRagtime.Inall,hewrotemorethan500songs.Joplin’sbiggestdreamwastocomposearagtimeopera.Finally,after10years,JoplincompletedaragtimeoperawhichhecalledTreemonisha.Thisoperawasaboutayoungblackwomanwhobecamealeaderofherpeople.Shetriedtohelpherpeoplegaintheirfreedomandtheirrights.1916,Joplinbecameverysick.Hehadadiseasethatmadehimforgetthingsandbecomeeasilyafraidofthings.In1917,hewasputinthehospital.HefinallydiedthereonApril1,1917.ScottJoplin’smusicbecamepopularagainintheearly1970swhenitwasusedinamoviecalledTheSting.1、Whichofthefollowingbestdescribesragtime?A．Itisakindofjazzmusic.B．ItwasborninTexas.C．Itsoundsslowandsad.D．Itisplayedontheguitar.2、Joplintookupragtime.A．withstrongfamilysupportB．againsthisfather’swillC．foraricherandhappierlifeD．withthehopeoftraveling3、WhatcanweknowMapleLeafRag?A．Itwasaragtimeopera.B．Itwasattackedbyothercomposers.C．Itwasusedinamovie.D．Itwonthecomposergreathonor.4、WhichofthewordscanbestdescribeScottJoplin?A．Talentedandtraditional.B．Determinedandproductive.C．Stubbornandcautious.D．Patientandgenerous.22．（8分）Ayoungmanwanderedthroughthedesertforfortydaysuntilhereachedabeautifulcastleatthetopofamountain.Therelivedthesage(圣人)thathewaslookingfor.Withconsiderablepatience,thesagelistenedattentivelytothereasonfortheboy’svisit,buttoldhimthatatthatmomenthedidnothavetimetoexplaintohimthesecretofhappiness.Hesuggestedthattheyoungmantakeawalkaroundhispalaceandcomebackintwohours’time.“However,Iwanttoaskyouafavor,”headded,bandingtheboyateaspoon,inwhichhepouredtwodropsofoil.“Whileyouwalk,carrythisspoonanddon’tlettheoilspill.”Theyoungmanbegantoclimbupanddownthepalacestaircases,alwayskeepinghiseyesfixedonthespoon.Attheendoftwohourshereturnedtothepresenceofthewiseman.“So,”askedthesage,“didyouseethePersiantapestries(挂毯)hanginginmydiningroom?DidyouseethefantasticgardenthattheMasterofGardenersspenttenyearsincreating?”Embarrassed,theyoungmanadmittedthathehadseennothing.“So,gobackandseethewondersofmyworld,”saidthewiseman.“Youcan’ttrustamanifyoudon’tknowhishouse.”Nowmoreatease,theyoungmantookthespoonandwanderedagainthroughthepalace,thistimepayingattentiontoalltheworksofartthathungfromtheceilingsandwalls.Hesawthegardens,themountainsallaroundthepalace,andthedelicacyoftheflowers.Returningtothesage,hereportedindetailwhathehadseen.“ButwherearethetwodropsofoilthatIentrustedtoyou?”askedtheSage.Lookingdownatthespoon,theyoungmanrealizedthathehadspilledtheoil.“Well,thatistheonlyadviceIhavetogiveyou,”saidthesage.“Thesecretofhappinessliesinlookingatallthewondersoftheworldandneverforgettingthetwodropsofoilinthespoon.”1、Whatwastheintentionoftheyoungmantotraveltolookforthesage?A．Toappreciatethemostbeautifulsceneryalongtheway.B．Toexperienceadventuresoftheoutsideworld.C．Tolearnthesecretofhappinessfromthewisestman.D．Tofigureoutwhetherthesagewasknowledgeableornot.2、Whichofthefollowingstatementsiswrong?A．Thesagelistenedtotheyoungmanwithpatience.B．Theyoungmanmadeitasthesagehadexpected.C．Duringhissecondroundofwandering,theyoungmanappreciatedthewondersofthecastle.D．Theyoungmanwastooconcernedabouttheoilwhenhefirstwentaroundthecastle.3、Whydidthesageasktheyoungmantogoaroundhiscastlewithaspoonoftwodropsofoil?A．Becausehewantedtofindoutwhethertheyoungmanwasperseverant(坚持不懈的)inaccomplishinghisgoals.B．Becauseheintendedtolettheyoungmanknowthathappinesscameataprice.C．Becausehewantedtohelptheyoungmantouncoverthesecretofhappinessinanindirectway.D．Becausehewantedtolettheyoungmantrusthim.4、Whatcanwelearnfromthestory?A．Realhappinessconsistsinenjoyingourrightsandmeanwhilefulfillingourduties.B．Wecan’ttrustamanunlesswegetfamiliarwithhishouse.C．Thesearchforthesecretofhappinessdemandsourdevotion.D．It’snoteasytokeepbalancebetweenenjoymentandcommitment.23．（8分）YourNewYear’splantomovemoreisoneofthetoughesttostickto,andagroupofscientistsworkingwithobese(过度肥胖的)micethinkthey’restartingtounderstandwhyRatherthanoursedentary(久坐的)livescausingweightgain,saysAlexxaiKraviz,theNationalInstitutesofHealthneuroscientistwholedthestudy,changesinbrainchemistryafterwestartgainingweightaffectourcapacitytomove.“Obsesmicecanmovejustfine,”saysKravitz,whopublishedtheworkwithhisteaminCellMetabolism“Theyjustdon’t.”WhatKravitz’steamfoundisthattheactivityofaparticulardopamine(多巴胺)receptorlinkedtomovementgoesdownasmicegainweightonahigh-fatdiet.Sotheniceslowdownandtheymoveless.Andwhentheresearchersrestoredtheactivityofthatdopaminereceptor—DR2—themicestartedmovingmore,eventhoughtheywerestillobese.TheteamalsosawthatleanmicemissingtheDR2receptoractedlikeobesemice.Thisisthetarget,saysKravitz—restoringthatdopaminereceptorfunction.“Maybe20or30yearsdowntheroad,wecoulddothatinpeople,”hesays.Andthereisonemorething:ThescientistsfednormalmiceandthemicelackingDR2thesamehigh-fatdiet.Bothsetsofmicegainedweightatthesamerate.KravitzsaysthisisimportantbecausemicelackingDR2movelessfromtheget-go,whereasanormalmousetakesalittletimetostartseeingthatdopaminereceptor-relatedlossofexercise.Theabilitytoexerciseseemstobedisconnectedfromweightgain,hesays.“Exerciseisahealthythingtodo,butitsimpactonweightlosshasbeenexaggerated,”hesays.“Wehavetoberealisticaboutthesizeoftheeffectofexerciseonweight,asopposedtohealthbenefits.”Still,beforeyouabandonyourNewYear’sexerciseplan,keepinmindthatthisstudywasdoneusingahigh-fatdiet,andnotthenormalcalorierestrictionthatpeoplemaintainwhentheydiet.That’sabigdrawbacktothework,saysVickiVieira-Potter,aUniversityofMissouriphysiologistnotinvolvedinthestudy.“Theyfeedthemicewithhigh-fatdiet,itdamagesthereceptor,andthatdecreasesactivity.Thosewhoplantolostweightshouldrememberhigh-fatdietisanicewaytocauseobesityinthelab,butit’snotthesameasthenormalsituationofobesity,”shesays.Sinealsosaysthatalotoftheweightgaininthemicecameaftertheystoppedmovingaround,whichindicatesthatthelossofmovementdidimpactobesity.1、AlexxaiKravitzislikelytoagreethat________.A．high-fatfoodleadstothelackofDR2B．lessmovementresultsfromweightgainC．thelackofDR2resultsinlessmovementD．weightgainleadstotheinactivityofDR2.2、Whatcanweinferfromtheresearchmentionedinthepassage?A．High-fatdietisboundtocauseobesity.B．Theresearchteamaimtodealwithhumanobesity.C．High-fatdiethaslittleinfluenceontherateofweightgain.D．Obesemice’sabilitytomoveisaffectedbytheinactivityofDR2.3、Theunderlinedword“exaggerated”inParagraph7canbereplacedby“________”.A．underestimatedB．excludedC．overlookedD．overemphasized4、AccordingtoVickiVicki-Vieira-Potter,________.A．besidesdiet,otherfactorsbehindobesityshouldn’tbeignoredindailylifeB．thetotallossofmovementcandoharmtothefunctionofDR2C．AlexxaiKravitz’steammisreadtheresultsoftheresearchD．obesityismainlycausedbyhigh-fatdietpeopletake.24．（8分）Manyanimalsrecognizetheirfoodbecausetheyseeit.Sodohumans.Whenyouseeanappleorapieceofchocolateyouknowthatthesearethingsyoucaneat.Youcanalsouseothersenseswhenyouchooseyourfood.Youmaylikeitbecauseitsmellsgoodorbecauseittastesgood.Youmaydislikesometypesoffoodbecausetheydonotlook,smellortasteverynice.Differentanimalsusedifferentsensestofindandchoosetheirfood.Afewanimalsdependononlyoneoftheirsenses,whilemostanimalsusemorethanonesense.Althoughtherearemanydifferenttypesoffood,someanimalsspendtheirliveseatingonlyonetype.Thegiantpandaeatsonlyoneparticulartypeofbamboo.Otheranimalseatonlyonetypeoffoodevenwhengiventhechoice.Alandofwhitebutterflywillstayontheleavesofacabbage,eventhoughthereareplentyofothervegetablesinthegarden.However,mostanimalshaveamorevarieddiet.Thebeareatsfruitsandfish.Thefoxeatssmallanimals,birdsandfruits.Thedietoftheseanimalswillbedifferentdependingontheseason.Humanshaveaveryvarieddiet.Weofteneatfoodbecausewelikeitandnotbecauseitisgoodforus.IncountriessuchasFranceandBritain,peopleeatfoodswithtoomuchsugar.Thismakesthemoverweight,whichisbadfortheirhealthEatingtoomuchredmeatandanimalproducts,suchasbutter,canalsobebadforthehealthChoosingtherightfood,therefore,hasbecomeanareaofstudyinmodernlife.1、Wecaninferfromthetextthathumansandanimals.A．dependononesenseinchoosingfoodB．arenotsatisfiedwiththeirfoodC．choosefoodinsimilarwaysD．eatentirelydifferentfood2、Whichofthefollowingeatsonlyonetypeoffood?A．ThewhitebutterflyB．Thesmallbird.C．Thebear.D．Thefox.3、Certainanimalschangetheirchoiceoffoodwhen.A．theseasonchangesB．thefoodcolorchangesC．theymovetodifferentplacesD．theyareattractedbydifferentsmells4、Wecanlearnfromthelastparagraphthat.A．foodischosenforagoodreasonB．FrenchandBritishfoodisgoodC．somepeoplehavefewchoicesoffoodD．somepeoplecarelittleabouthealthydiet5、WhichofthefollowingstatementsisTRUE?A．AnimalsoftenusesensestoeattheirfoodB．Mostanimalshaveamorevarieddiet.C．Allanimalsspendtheirliveseatingonetypeoffood.D．Thedietofbirdsandfoxwillbethesamedependingontheseason25．（10分）Whydowelaughandgetamusementfromsomanydifferentthings,frompuns(双关语)topratfalls?Whyaresomethingsfunnytosomepeopleandnottoothers?Howisthatwhileasuccessfuljokecancausepleasure,asickonecancauseseriousharm?Overthecenturies,variousscholarshaveattemptedtoproduceauniversallyagreed-upontheoryofhumor.PlatoandAristotleintroducedthesuperiority(优越感)theory,theideathatpeoplelaughatthemisfortuneofothers.Theirtheoryseemstoexplainteasing,butitdoesn’tworkwellforknock-knockjokes.SigmundFreudarguedforhisrelieftheory,theconceptthathumorisawayforpeopletoreleasepsychologicaltensionandrevealtheirinnerfearsanddesires.Histheoryworkswellfordirtyjokes,lesswellformostpuns.Themajorityofhumorexpelstodayagreewiththeincongruitytheory,theideathathumorariseswhenthere’sagapbetweenwhatpeopleexpecttohappenandwhatactuallyhappens.Incongruityhasalotgoingforit—jokeswithunexpectedfunnylines,forexample,fitwell.Butscientistshavefoundthatincomedy,unexpectednessisovervalued.Withthegoalofdevelopinganew,moresatisfactoryexplanation,Iproduced“thegentleviolation(违背)theory”,theideathathumorariseswhensomethingseemswrongorthreatening,butisactuallyOKorsafe.Adirtyjoke,forexample,tradesonmoralorsocialviolations,butit’sonlygoingtogetalaughifthepersonlisteningisopenenoughtoconsiderthesubjectOKtotalkabout.Similarly,punscanbeseenaslinguisticviolationsthatstillmakegrammaticalsense.Andwhilemosthumortheorieshavestruggledtoaccountfortickling(挠痒痒),orjustavoidedthephenomenonaltogether,mytheoryaccountsforeventhiskindoflaughter.Ticklinginvolvesviolatingsomeone’sphysicalspaceinagentleway.Peoplecan’tticklethemselves—becauseitisn’taviolation.1、Whatistheauthor’sattitudetowardsPlatoandAristotle’stheory?A．Critical. B．Approving.C．Uncaring D．Unclear.2、AccordingtoSigmundFreud’stheory,wecaninferthat________.A．peoplewilllaughwhentheyseeotherssufferB．tellingdirtyjokesisareliefofone’snervousfeelings’C．unexpectednesscanexplainhowhumorworksD．ticklingdoesn’tinvolvepsychologicaltension3、Accordingtotheauthor,whyaresomethingsfunnytosomepeoplebutnottoothers?A．Becausethesenseofhumorvariesgreatlyfrompersontoperson.B．Becausepeoplehavedifferentexpectationsforthesamething.C．Becausesomepeoplelackthesenseofsafetydeepintheirheart.D．Becausepeople’sunderstandingofviolationisdifferent.4、Whatistheauthor’smainpurposeofwritingthispassage?A．Todrawpeople’sattentiontotheresearchofhumor.B．Tocriticizepeople’smisconceptionsabouthumor.C．Toexplainwhatexactlycausespeopletolaugh.D．Toprovethesenseofhumorcanbedeveloped.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）IwastravelingbytrainfromPerthtoCentralonemorning.Quietlysittingtherereading,Ifoundmyselfsuddenlylisteningtothetrainguard’s1.AsIlookedupfrommypaper,Inoticedotherpassengers,2absorbedintheirsmartphones,alsoappearedtobelistening.Whydidthey3thismessagesomuch?AsbestIcanrecall,theguardsaidsomethingalongthe4,“GoodMorning,everyone!Thisisthe7:35a.m.trainfromPerthtoCentralandwearerightontime.Itisreallya5morninginSydneytoday!Thesunisshining,birdsare6,andall’srightwiththeworld.Itrustyouhaveagreatdaywhereveryou’regoing.Thanksfor7mytrainandIhopetoseeyouagainsoon.Haveagreatday.”Everyonestartedsmiling,eventhe8talkingtooneanother,allabouttheguard’s9andhowgooditmadeeveryonefeel.IwasthinkingaboutthisandasIexitedthetrain,I10theGuard’scabintothankhim,onlytobetoldhehadjustfinishedhis11andwasonhiswayhome.ThenI12downthestairs.Atthebottom,Ifinally13theyoungguard.“Areyoutheguardonthe7:35trainfromPerth?”“Oh,oh,yes,yes.”repliedtheguard,abit14atfirst.“Well,Ijustwanttothankyouforyourmessage.Itissoupbeatandpleasant.Thankyouforgivingussuchagood15totheday.Please16doingit.”Whenpeoplearehappyintheir17,itshowsinwhattheydoandsay,whichwillmakea18toeachother.Canyouimaginetheconversationthatguardwouldhaveattablewhenhe19home,“Guesswhathappenedtometoday—acustomeractually20me!”1、A．announcementB．explanationC．appreciationD．arrangement2、A．confidentlyB．deliberatelyC．anxiouslyD．previously3、A．objecttoB．payattentiontoC．getacrossD．giveout4、A．rowsB．textsC．linesD．passages5、A．busyB．violentC．freeD．lovely6、A．fallingB．singingC．tremblingD．hiding7、A．leavingB．decoratingC．takingD．cleaning8、A．friendsB．cleanersC．acquaintancesD．strangers9、A．messageB．instructionC．requirementD．warning10、A．watchedB．approachedC．ignoredD．escaped11、A．shiftB．speechC．advertisementD．vocation12、A．wentB．fellC．racedD．broke13、A．missedB．caughtC．mistookD．avoided14、A．honoredB．relaxedC．movedD．shocked15、A．arrangementB．conclusionC．startD．excuse16、A．keepB．rememberC．imagineD．risk17、A．lectureB．workC．challengeD．traveling18、A．conversationB．promiseC．differenceD．compromise19、A．gotB．leftC．missedD．drove20、A．followedB．frightenedC．embarrassedD．thanked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）语法填空Thegiantvendingmachine（自动售货机）isanewvillageshopVillagershavelongbeenusedto1．(face)adrivewhentheyrunoutofbasicsupplies.2．,helpisnownearerathandintheformofthecountry'sfirstautomaticpush-buttonshop.NowresidentsintheDerbyshirevillageofCliftoncanbuygroceriesaroundtheclockafterthehugevendingwasinstalledoutsideapubinthevillagethisweek.PeterFox,whois3．electricalengineer,spenttwoandahalfyearsworkingontheproject.Themachine4．(equip)withsecuritycamerasandalarms,andlookslikeaminishopwithabrickfront,agreyroofandadisplaywindow.Mr.Foxsaidhehopedhisinvention,5．issettobeinstalledinothervillagesintheareaoverthecomingmonths,willmarkareturntoconvenienceshoppingforruralcommunities.Hesaid:"IhadthisideaafewyearsagobutIcouldn'tfindamanufacturerwhocoulddeliverwhatIwanted,soIdiditby6．.Theresultiswhatamountstoahugeoutdoorvendingmachine.YetIthinkthetermautomaticshopisfar7．(appropriate)."Inrecentyears,thecommercialpressurefromsupermarketchains8．(force)villageshopsacrossthecountrytoclose.In2010,itwasestimatedthatabout400villageshopsclosed,9．(urge)thelocalgovernmenttogivefinancialsupporttostrugglingshopsorset-upnewcommunitystores.Hundredsofcommunitieshavesincesteppedinandopeneduptheirownvolunteer-runshops,butMr.Foxhopeshisnewinventionwillofferasolution10．thosevillageswithoutalocalshop.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短文。短文中共有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：在缺词处加一个漏字符号（∧），并在此符号下面写出该加的词。删除：把多余的词用斜线（＼）划掉。修改：在错的词下划一横线，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。Ihavejustgotsomegoodnewstotellyou.Iwinanationalprizeformypaintinglastweek.MyfatherwassopleasingthathesuggestedIwenttoEnglandforaholidaythissummer.I'dliketostayhereforhalfamonth,visitingsomeplacesofinterestandpractisemyEnglishaswell.Wehavekeptintoucheachotherfornearlyayearnow.Ihaveoftendreamedoftalkingfacetofacewithyou.Ihopeyou'llbeontheholidayatthattime,butI'msurewewillhavealottotalkabout.Ialsowanttobuysomesouvenirformyfriendsathome.IfIhaveanybetterideas,pleasesharethemwithme.第二节书面表达（满分25分）29．（25分）假如你是育才高中高三(1)班学生李华，你在21世纪英文报(21stCentury)上看到一则招聘“校园之声”栏目记者的广告，你对该职位感兴趣，请给报社主编写一封