2026届湖北省沙洋县后港中学高三下学期阶段性检测试题考试（二）英语试题试卷含解析

2026届湖北省沙洋县后港中学高三下学期阶段性检测试题考试（二）英语试题试卷注意事项：1．答卷前，考生务必将自己的姓名、准考证号填写在答题卡上。2．回答选择题时，选出每小题答案后，用铅笔把答题卡上对应题目的答案标号涂黑，如需改动，用橡皮擦干净后，再选涂其它答案标号。回答非选择题时，将答案写在答题卡上，写在本试卷上无效。3．考试结束后，将本试卷和答题卡一并交回。第一部分（共20小题，每小题1.5分，满分30分）1．Itgivesusgreatdelight______Chinesesciencefictionsarebecomingincreasinglypopular.A．how B．whatC．that D．why2．Notevenwhen_____throughthedarkestvalley_____beafraid,foryouarealwaysclosebesideme.A．doIwalk;willIB．doIwalk;IwillC．Iwalk;IwillD．Iwalk;willI3．PremierLiKeqiangofficially______theplantodeveloptheBayAreainhisgovernmentworkreportdeliveredatthestartoftheNationalPeople’sCongresssessioninMarch.A．laidoutB．laidoffC．laiddownD．laidup4．Aftercollege,hewasemployedinamiddleschoolandthereeversince.A．wouldworkedB．hadworkedC．workedD．hasworked5．—Whydidn’tyoutrytofinishthecomposition?—Itriedto,but________Icould,thebellranannouncingtheendoftheexamination.A．until B．whenC．after D．before6．Officefurniturelikechairsandsofasshouldbeattractiveaswellascomfortable.A．manually B．visuallyC．physically D．securely7．Mynewjob_______mytravellingalloverthecountry,whichmeansIwon’tbeabletospendmuchtimewithmyfamily.A．takes B．promises C．involves D．causes8．Shedidnotfeelabitnervousthoughitwasthefirsttimeshe___________inpublic.A．spoke B．havespokenC．hadspoken D．werespeaking9．Wepackedallthehooksinwoodenboxessothattheydamaged.A．don’tgetB．won’tgetC．didn’tgetD．wouldn’tget10．Afterthefire，________________wouldotherwisebeaculturalcenterisnowreducedtoapileofashes.A．that B．itC．what D．which11．I_________tohelpyoutodohomeworkbutIcouldn'tspareanytime.I________acompositionlastnightandI'llfinishittomorrow.A．wanted；wrote B．hadwanted；waswritingC．hadwanted；wrote D．wanted；havebeenwriting12．--DidJimcome?--Idon’tknow.He_______whileIwasout.A．mighthavecome B．mightcomeC．musthavecome D．shouldhavecome13．Ifhe________histeacher’ssuggestion,hewouldhavewontheEnglishSpeechContest.A．hadfollowed B．shouldfollowC．wastofollow D．followed14．Ifeelcold.____Iclosethewindow?Sure.Goahead!A．ShallB．NeedC．WouldD．Should15．—Tedhasneverbeensorude!—He______somethingheshouldn’thave,butIguesshedidn’tmeanthat.A．hassaid B．hadsaidC．said D．wassaying16．Althoughpassingthedrivingtest________bedifficultnow,it’sworththeefforts.A．need B．shallC．can D．should17．DreamoftheRedChamberisbelievedtobesemi-autobiographical,_______thefortunesofCao’sownfamily.A．mirroredB．tomirrorC．mirroringD．mirror18．ThepredictionfromMayaworriesresidents_______December21,2012wouldbetheendoftheworld.A．if B．that C．whether D．which19．IorderedadrinkwhileI______formyfriendstocome.A．willwaitB．amwaitingC．wouldwaitD．waswaiting20．Theboythefirstprize,buthewassocarelessastomakeafoolishmistake.A．musthavegained B．needhavegainedC．couldhavegained D．shallhavegained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）IwalkedtoMrs.Windsor’shouseandwaitedoutside.Shewasworkingwithanotherstudent,andIwasnotsupposedtobotherthembyringingthebell.IstoodagainstthewallanddaydreamedwhatI’dratherbedoing.Ihadbeentutoredenoughtoread,understand,andevenwritesomemusicalcompositions,butIjustdidn’thaveagiftforit.Mrs.Windsorhadofferedtogivemethelessonsforfree,soIfeltmydutytotry.ThedooropenedandWendyBartoncameout.Iwalkedin,satdownonthepianobenchandbegantosortthroughmysheetmusic.TodayMrs.WindsorintroducedherniecePashatoteachme.Withasmile,Pashasatbesidemeonthepianobench,openedmysheetmusictothebeginningpageandaskedmetoplay.Iarrangedmyfingersonthekeys.ThenIfrowned(皱眉)andconcentratedtomakethenotesonthepagematchthefingermovements.IhadtoadmitIwasarathermechanical(呆板的)pianist.Afteraboutapageortwo,Pashagentlyputherhandontopofmineasiftocalmmyfingers.Therewasalongpause.“Whatareyouhearinginthemusic?”IlookedatherratherstrangelyandadmittedIdidn’tknowwhatshemeant.“Likeastory.Here,letmetryandyoulisten,”Pashaadvised.Sheclosedhereyesandtookadeepbreath,lettingherfingersdancelightlyoverthekeys.Then,shebegantoplay.“See,itbeginsherebesidesomekindofriver.Hearthewaterflowingbesideyou?”Herfingersroseandfellgentlyonthekeys.“Nowtheprincessappearsandshe’spickingflowersfromthewater’sedge.”AhappypieceofmusicfilledtheairintimetoPasha’sdancingfingers.“Oh,butsheslips!”Themusicchanged.“Andourprincessisbeingcarriedoffbythefast-flowingstream.Quickly,theprincess’horseseesherplight(困境)andracestotheriver’sedgewhereheswimsouttolethercatchholdofhim.Luckily,theymakeittothebank.”Pashasaid.Iplayedmanypiecesofmusicthatafternoon,findingthestoriesinthemusicandlearningthatsometimesittakesafriendtopullyououtoftheriverontodrylandagain.1、Bydescribingherselfasamechanicalpianist,theauthormeant________.A．shecouldrememberthenotesinashorttimeB．shewasplayingthepianowithoutemotionC．herfingerscouldn’tmovefreelyD．ithadbeenalongtimesincesheplayedlasttime2、WhichofthefollowingcanbestdescribePasha?A．Creative. B．Honest. C．Humorous. D．Brave.3、Pasha’smagicofplayingthepianoliesinthatshe________.A．imaginedherselfasaprincessB．knewitsoriginalbackgroundstoryC．hadastrongdesiretomakeafriendD．combinedthemusicwithastory4、Whichofthefollowingisthebesttitleforthetext?A．AFriendForeverB．NeverGiveupC．APianoLessonD．MyFavoritePieceofMusic22．（8分）HalfanhourintoacookingcompetitionatGreenStreetAcademy,TyanaGivens,15,dippedaplasticspoonintoapotwithtomatoes,bellpeppers,onions,garlicandmushroomsoveraburnerinascienceclassroom.Sheandthetwootherstudents,KalimahBallandMayaSmith,weremakingmeatsauce.Thegirlshadspentthepastfiveweekslearninghowtogrowtheirownproduceusingfoodcomputers-tabletopgreenhousescontrolledbycomputerprograms-atGreenStreetAcademy,acharterschoolinBaltimore.Thecourse,whichweavedtogetherlessonsonprogramming,foodsystemsandagriculture,endedwithan“IronChef”-stylecookingcontest.WiththehelpofinstructorMelanieShimano,thegirlsfinishedtheircontestsuccessfullyusingthefoodtheyplantedintabletopgreenhouses.Thetabletopgreenhousescancontroltemperature,lightandwaterinsideusingthecomputercodethatthestudentswrotebythemselves.Shimano,a26-year-oldentrepreneur,piloted(试行)thecourseaspartofGreenStreetAcademy’sjuniorbiotechnologyclassinthespringandwillexpandtheprogramtootherschoolsinthefall.“Technologyisnotsomethingthatalotofteachershavealotofresourcesforallthetime,butit’ssomethingthat’snotdifficulttodowitharelativelylowamountoffunding,”Shimanosaid.“Baltimoreisacenterforstartupsandfood,sokindoffosteringthatcultureofbeingintotechnologyandintodesignandseeingallthepiecesfittogetherisreallycool.”WhilehercourseisuniquetoBaltimore,it’spartofabroaderprogrambornattheMassachusettsInstituteofTechnology’sMediaLabcalledtheOpenAgricultureInitiative,orOpenAg,whichaimstocreateinventive,sustainablefoodsystemsthroughopen-sourcetechnology.Inadditionto10full-timestaffandresearchers,OpenAgisprimarilyanonlinecommunityofabout1,400educators,growers,chefsandretailersin47countries,accordingtoHildrethEngland,OpenAg’sassistantdirector.“Theinterestlevelacrosstheboardgenerallycomesfromfolkswhoareconcernedaboutfoodsystemsandconcernedabouttheenvironment,andit’susuallyacombinationofthetwo,”Englandsaid.1、What’sspecialaboutthecoursetakenbyTyanaGivens?A．It’sacookingcourseB．ItinvolvesseveralsubjectsC．ItisintendedforacontestD．Itiscontrolledbytabletopgreenhouses.2、Whydidthestudentshavetowritecomputercodestogrowfood?A．TowinacookingcontestB．TofinishhomeworkC．TocreateagreenhouseD．Tocontrolthegrowingconditions3、What’sShimano’sopinionabouttechnologyeducation?A．ItcallsofteacherswithmanyresourcesB．ItcallsforalotofmoneyC．ItissupposedtocombineskillstogetherD．Itcanonlybecarriedoutinbigcities.4、WhatcanbelearnedabouttheOpenAgricultureInitiative?A．Itisparticipatedbyfull-time.M.I.TresearchersaswellaspeoplefromdifferentwalkoflifeB．ItwillhelpcreateabettereducationsystemC．ItonlycoverstheUSAD．Itfocusesonfoodandcateringindustry.23．（8分）Cananimalsbeartistic?PaintingandmusicarepartofeffortstokeepanimalshappyattheSmithsonian’sNationalZoo.Aslothbear(长毛熊)calledFrancoisisoneoftheNationalZoo’sartists.Hebeganhisartisticcareertwoyearsago.Francoishasaveryunusualwaytopaint.Heuseshisbreathingtopaint.Hiszookeeper,StaceyTabellario,saysthatalthoughthetechniquemaylookstrange,itisactuallyaverynaturalbehaviorforslothbears.Thezookeepersfilloneofthosetubesfullofpaintandaskthemtobreathethroughit.Andtheyblowallofthepaintsontothecanvases(画布),makingthesereallycoolpaintings.AnimalartistscomeinallshapesandsizesattheZoo.Theyusemanykindsoftechniquestocreatetheirworksofart.Apesusepaintbrushes.Manyusetheirpawsorclaws—muchlikeahumanpainterwhowouldusehisorherhands.StaceyTabellariosaysFrancoisseemstoenjoyexpressinghimselfthroughhisart.“WhenIsetupthematerialsforpaintingactivity,hecomesandsitsnexttothemandwaitsuntiltheyarereadyforpainting.Hedoesthateverytime.Ialsoseewherehiseyesgo.Hedoesseethepaintscomeoutofthetubeandlandonthecanvas.”Butnoteveryanimalwantstopaint.Musicisanotherpartoftheartsenrichmentprogram.Physicallyandmentallystimulatingactivitiesareanimportantpartofthedailycareoftheanimals.Trainershavealotoftools,fromtabletcomputertosmalltoys.KentonKernssaystheprogramhelpstheanimalsandthezookeepersinmanyways.Everyinteractionbetweenkeepersandtheiranimalscreatessomesortofconnections.Theone-of-a-kindworksofartcreatedbytheanimalsarepopularwithzoovisitors.Manyaresoldatthezoo’sfund-raisingevents.1、FromParagraph2,wecanlearnthat________.A．Francoisisatwo-year-oldartistattheNationalZooB．FrancoiscanmakefantasticpaintingswithpaintbrushesC．Francois,waytopaintisanunnaturalbehaviorforslothbearsD．Francoispaintsbyblowingthepaintsinthetubesontothecanvas2、Accordingtothepassage,theapespaintby________.A．blowingthetubesfullofpaintsB．usingtheirhandsdirectlyC．usingsometoolsD．walkingonthecanvas3、Fromthelastparagraph,wecanlearntheworksofartcreatedbytheanimals________.A．canbesoldatahighpriceB．aremainlypopularwiththekidsC．createhigherpricesthantheartistsD．canbeboughtatthezoo’sfund-raisingevents4、What’sthemainideaofthepassage?A．Zooanimalsshowartisticside.B．Paintingandmusicareusefulinthezoo.C．Animalsenjoypainting.D．Animalsneedenrichmenttoo.24．（8分）JOHANNESBURG—Theysaycatshaveninelives.NowaChinesetoad(蟾蜍)hasjoinedthatclubofcleversurvivors.SouthAfricansareshockedattheenduranceofatoadthatgottrappedinacargoshipmentfromChinatoCapeTown,afterjumpingintoaporcelain(瓷器)candlestick（烛台）thatwasmadethere.SouthAfricanofficialsreportedlyplannedtoputdownthecreature,fearingitwouldcauseharmasaninvasivespeciesifitwereletgointhewild.Butthetoadgotalast-minutepardon.MangoAirlines,aSouthAfricanairline,transportedthetoadonFridaytoJohannesburgfordeliverytoananimalshelter,afterofficialsdecidedtofindawaytoletthetoadlive.Thetwo-hourfightwasabreezecomparedtothetripfromChina,alongwayofmanyweeksandthousandsofkilometersacrosstheIndianOcean.AirlinespokesmanHeinKaisersaidthetoadgot“first-classtreatment”,sittinginatransparentplasticcontainerwithescortBrettGlasby,ananimalwelfareinspector.Therewasevenaceremony,inwhichthetoad’sboardingpasswashandedtoGlasby.“Hewasthestaroftheshowontheflight,”Kaisersaidoftheamphibious(两栖的)passenger.“Ithinkeverypassengerstoppedtohavealook.”OnlandinginJohannesburg,thetoadwasbroughtoutofitscontainerforacelebrity-stylephotoshoot.Observerssaidthebrowntoadseemedlikeacoolcustomer.ItbelongstotheAsianToadspecies,whichbreedsduringthemonsoon(季风)season.ItisbelievedtohavesurvivedthetripfromChinabyhardeningitsskintopreventitfromdryingout,andalsobyslowingitsbreathingandheartrate—methodsthathelpthespeciessurviveintimesofdrought.“We’vehadsnakesinimportedtimberandscorpions(蝎子)infruit.Wewerecalledbecausethetoadwasrightinsidethecandlestick,andwehadtobreakittogetitout”Glasby,theinspector,toldTheStar,aSouthAfricannewspaper.1、Whatisthepassagemainlyabout?A．AnAsiantoadgetsanewhomeinSouthAfrica.B．Asiantoadscan’tgetusedtothelifeinSouthAfrica.C．WorkersshippedatoadtoSouthAfricaonpurpose.D．SouthAfricaignorestheprotectionofanimals.2、Ifthetoadisreleasedintothewild,_________.A．itwillmakethelocalsfeelshockedB．itmightharmthenativespeciesC．itwillloseitslifeinthewildD．itmightfleeintoanothercountry3、ThetoadwasabletoarriveinSouthAfricaalive_________.A．becauseitescapedallattacksandhuntsB．becauseitusedtostopitsbreathinwinterC．becauseitformedhardskintoprotectitselfD．becauseitwasluckytobegivenachance4、Itcanbeinferredfromthepassagethat_________.A．sometimesanimalaretransportedaccidentallyB．noonehasseensuchabigtoadinAfricaC．acandlestickisthebestplaceforatoadD．droughtsmaketoadslivelonger25．（10分）Lackofinexpensive,reliableenergydeliveryisoneofthechiefbarrierstogrowthanddevelopmentinsub-SaharanAfrica.Nearlyseventypercentofpeoplelivingintheregionlackaccesstoelectricity,forcingthemtospendsignificantamountsoftheirincomeoncostlyandunhealthyformsofenergysuchasdiesel(柴油)fueltorungeneratorsandkerosene(煤油)forlanterns.ButifthereisonethingAfricaisnotlacking,itissunshine.Andthatmeansalot;indeed,forsomeoftheworld’spoorestpeople,itmakesallthedifferenceintheworld.Alittlemorethanayearago,PowerAfrica—aU.S.Governmentinitiative(倡议)coordinatedbytheU.S.AgencyforInternationalDevelopment,orUSAID—andPowerAfrica’spartners,theUnitedKingdomDepartmentforInternationalDevelopment,ShellFoundation,andtheAfricanDevelopmentBank,startedtheScalingOff-GridEnergyGrandChallengeforDevelopment,withafocusonpay-as-you-gosolarhomesystems.TheChallenge’sgoalistoprovide20millionoff-grid(离网)householdsinsub-SaharanAfricawithclean,affordableelectricityby2030.Sofar,theChallengehasmade40-plusinvestmentsinearly-stage,off-gridenergycompanies,whichareexpectedtoresultinsome4.8millionnewelectricalconnections.Onereasonforthesuccessofthestart-upcompaniesthathavewongrants(资助)fromtheChallengeisthefactthatthecostofsolartechnologyisfallingfast,soitiswithinthemeansofthosewholiveawayfromtraditionalpowergrids.Andthankstothenewsystemofmobilemoneyandpay-as-you-gofinancing,theycanpurchasethesolarpower-generatingequipmenttheyneedandpayforitindailyinstallments(分期付款)fromtheirtelephones,foraslittleas15centsaday.Thankstothesetechnologicalandfinancialinnovations(创新),manypeoplearegettingelectricityforthefirsttimeeveryday.Inthesenewly-electrifiedcommunities,businessescanboom,clinicscansafelystorevaccinesandstudentsmaystudylongafterdark.Indeed,accesstocleanandreliableelectricitycanenableentirecommunitiestoescapethecycleofextremepoverty.1、Whatisthemainproblempeopleinsub-SaharanAfricaarefacedwith,accordingtoParagraph1?A．Theyarelackofelectricity.B．Theyarelackofdieselfuelandkerosene.C．Theyarelackofmoney.D．Theyarelackofsunshine.2、What’stheaimofPowerAfrica?A．Tomakepeoplericher.B．Tomakepeoplehealthier.C．Toprovidepeoplewithcleanfoodandwater.D．Toprovidepeoplewithinexpensiveelectricity.3、WhichisNOTthereasonforthesuccessofthestart-upcompanies?A．Thecostofsolartechnologyisdropping.B．Theyliveawayfromtraditionalpowergrids.C．Theycanusethenewsystemofmobilemoneyandpay-as-you-gofinancing.D．Theycanpayfortheequipmentindailylowinstallments.4、Thetextisespeciallyhelpfulforthosewhocareabout________.A．agricultureB．environmentC．technologyD．education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）Manypeoplethinkthatbabysittingisoneofthe1jobsforyoungpeople.Theyimagineateenagerputtingafewwell-behavedchildrentobedandthencontinuingtowatchtelevisionuntiltheparentsreturnhometohandoversomemoney.Well,Icantellyouhow2thatthoughtis.Inowworkall3onWednesdaysforaUkrainianfamilywiththreeyoungboys.Intheearlymorning,Igothereto4theoldertwowhiletheirmotherdoesherjobsortakescareofhersix-month-oldbaby.However,Iamalsothereto5theirEnglishbyteachingthemsongsandgamesinmynativelanguage.Now,fourmonthslater,Igethomeattheendoftheday6exhausted！Babysittingisnotajobforthe7ortheweak.Iexpected8childrenwhowouldbehavewellandlistentomeallthetime.9,Idon’tthinkthosekindofchildrenexistatall.Whilemytwoboysareusuallypoliteandcalm,theyare10childrenandalsoliketofight,screamandlosetheirtemperfornoreal11.Ioftenhavenoideawhytheycrytogether.Beingababysitterrequiresyoutoplayahundreddifferent12throughouttheday.IhavetobeafriendwhenIplaywiththeboys,buttheir13whenItellthemtodosomething.Whentheyhurtthemselves,Ihavetobetheir14,andwhentheyfightover15thingslikesharingtheircrayons(彩笔)，Ihavetobeanegotiator(调停者)。Whenlunchtimerollsaround,Iama(n)16topreparethemealandthenamaidasIcleanupafterlunch.Finally,inEnglish,ifsomeoneisvery17,wesaytheyhavethe“PatienceofGod”.IthinkIembody(体现)this18sometimes!Despitethe19involvedinmyjob,Iusuallydoenjoyit.WorkingwithchildrenissotiringthatIalwaysfeel20afterleavingthemwiththeirparentsattheendoftheday！1、A．hardestB．worstC．easiestD．heaviest2、A．wrongB．wonderfulC．rightD．believable3、A．morningB．afternoonC．nightD．day4、A．takeoffB．struggleagainstC．sendforD．lookafter5、A．learnB．improveC．exploreD．recognize6、A．suddenlyB．graduallyC．completelyD．exactly7、A．lazyB．youngC．strongD．rich8、A．impoliteB．perfectC．tallD．noisy9、A．AmazinglyB．StrangelyC．SadlyD．Hopefully10、A．traditionalB．formalC．unusualD．ordinary11、A．purposeB．doubtC．reasonD．question12、A．jobsB．partsC．looksD．toys13、A．teacherB．gardenerC．driverD．assistant14、A．nurseB．trainerC．guideD．protector15、A．surprisingB．unimportantC．seriousD．expensive16、A．managerB．eaterC．adviserD．cook17、A．patientB．impatientC．energeticD．lucky18、A．actionB．languageC．lessonD．expression19、A．satisfactionB．exhaustionC．disagreementD．kindness20、A．frightenedB．energeticC．relaxedD．nervous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）Peoplehaveallturnedtosadmusictomakethemselvesfeelbetteratsomepointintheirlives,1．whydoesthemusicwithdoubleoreventriplesadnesshelpdragpeopleoutoflowspirits?Anewstudythrowslightonwhat'sgoingoninsidepeople’sbrainswhentheymatchtheirmusictotheirfeelings,anditlooksasifsadmusiccanbeenjoyable,ratherthan2．(simple)depressingMusicofthissortcanarousepositivememoriesinpeople’slife,thus3．(lift)theirmoodPsychologistAdrianNorthfromCurtinUniversityinAustraliasaysthere4．(existence)twogroupsofpossibleexplanationsforwhypeopleenjoylisteningtosadmusiclikethisonefromsocialpsychology,andtheotherfromcognitiveneuroscience(神经学)5．termsofsocialpsychology,oneideaaboutthisisthatpeoplewillfeel6．(good)aboutthemselvesiftheyfocusonsomeonewho'sdoingevenworseEverything'sgoingtobeokay,becausethispersonishaving7．evenworsedaythantheyareAnotherideafromsocialpsychologyisthatpeopleliketolistentotheverymusic8．showstheirpresentlifecircumstances,becausethiskindofmusicmakesthemfeeltheyareunderstoodWiththeiremotions9．(share),theydefinitelygetacertainamountofcomfortSo,the10．(conclude)again—sadmusicdoescheerpeopleup,anditworksfarbetterthanhappymusic,inmostcases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处语言错误，每句中最多有两处。每处错误仅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：在错的词下划一横线，并在该同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。Today,Ivisitmyoldhouse、Ilivedthereoneandahalfyearago、WhenIamatschool,Ioftenthinkmyoldhousebecauseitmademehappyinthepast、Myoldhouse,thathasonlytworooms,isverytidyandbright、Itliesbetweentwohighhouses,lookverysmallandlovely、I’vedecidedtocelebratemyfifteenbirthdayinitthisyearbecausetheoldhouseismymostfavoriteplace、IfIstillliveinitornot,I’llkeepitselfinmyheartandIcanalwaysgetlotsofenergy、Neverforgettingthegoodolddays、第二节书面表达（满分25分）29．（25分）假定是李华,你的英国