湖北省當(dāng)陽市第二高級中學(xué)高三第二次調(diào)研新高考英語試卷及答案解析

湖北省當(dāng)陽市第二高級中學(xué)高三第二次調(diào)研新高考英語試卷請考生注意：1．請用2B鉛筆將選擇題答案涂填在答題紙相應(yīng)位置上，請用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、草稿紙上均無效。2．答題前，認(rèn)真閱讀答題紙上的《注意事項》，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．Youhavetorewritethemonthlyreportbecauseyou_____manyimportantdetails.A．turnedoff B．leftoutC．droppedby D．putup2．－Theonlineshopkeeperhasmadeanapologyforhisrudebehavior.－OK.Ifyou’restillnotsatisfied,youcan_______compensation.A．claim B．a(chǎn)ffordC．sacrifice D．dismiss3．Intheearlymorningallofusstoodatthetopofthemountain___________eastofthecity,watching__________burningsunrising.A．/;a B．the;aC．the;the D．/;the4．Wearrangedtomeetatthecinemaat7:30,butJackfailedto______.A．breakupB．setupC．turnupD．giveup5．—Ihavegotaheadache.—Nowonder.You___infrontofthatcomputertoolong.A．work B．a(chǎn)reworkingC．havebeenworking D．worked6．---Dad,haveyouseenmyChristmascard?---______youpaintedlastnight?I’mafraidIhaven’tseen______.A．One;one B．Theone;itC．One;it D．Theone;that7．Intimewereachedastagewehadmoreyoungreadersthanoldones． A．where B．how C．who D．what8．Theincidentturnedhimintodifferentperson,evenifhedidnotrealizeitatbeginning.A．a(chǎn);a B．the;the C．the;a D．a(chǎn);the9．Onceyou’ve________theitemsyouordered,putthisrecordinyourfile.A．checkedin B．checkedoffC．checkedout D．checkedwith10．Tedcouldn’tremembertheexactdateofthestorm,butheknewitwasSundaybecauseeverybodywasatchurch.A．/,the B．a(chǎn),/C．/,a D．the,/11．China’sChang’e4roboticprobeenteredlunarorbitonWednesday,________amajorstepinitsmissiontomakeasoftlandingonthemoon’sfarside.A．marking B．tomarkC．havingmarked D．marked12．Hisstrongsenseofhumorwasmakeeveryoneintheroomburstoutlaughing.A．soastoB．suchastoC．sothatD．suchthat13．The88thAcademyAwardCeremonywasheldinDolbyTheatre______seatsanaudienceofapproximately3,400.A．where B．whose C．when D．which14．Sometimesproperanswersarenotfartoseek________foodsafetyproblems.A．in B．toC．on D．a(chǎn)fter15．Iwascaughtinatrafficjamforoveranhour,otherwise,I________youwaitingforsuchalongtime.A．hadnotkept B．willnotkeepC．wouldnothavekept D．havenotkept16．Itcameasagreat________totheparentsthattheirsonfinallycamebacksafeandsound.A．relief B．senseC．relaxion D．favor17．Topgraduatesfromuniversitiesare________bymajorcompanies.A．chased B．registeredC．offered D．compromised18．The90’speopleseemtohaveenjoyedthegreatbenefits________aboutbythegreatlevelofculturalandeconomicdevelopment.A．broughtB．bringingC．tobebroughtD．havingbrought19．________________theheavyrain，thecouplewenttothesupermarkettobuytheirsonagift.A．Inspiteof B．ExceptforC．Butfor D．Insteadof20．_______naturallybytheskinwhenexposedtosunlight,VitaminDisneededforhealthybones,teethandmuscles.A．Making B．TomakeC．Made D．Make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）Inthelate1950s,aRussiangeneticistcalledDmitryK.Belyaevattemptedtocreateatame(馴化的)foxpopulation.ThroughtheworkofabreedingprogrammeattheInstituteofCytologyandGeneticsatNovosibirsk,inRussia,hesoughttofindtheevolutionarypathwayoftameanimals.Histestsubjectsweresilver-blackfoxes,amelanistic(帶黑色的)versionoftheredfoxthathadbeenbredinfarmsforthecoloroftheirfur.Heselectedtheanimalsbasedonhowtheyrespondedwhentheircagewasopened.About10%ofthefoxesdisplayedaweak“wild-response”,meaningtheyweredocilearoundhumans.Thosethathidinthecornerormadeaggressivevoiceswereleftinthefarm.Ofthosefriendlyfoxes,100femalesand30maleswerechosenasthefirstgenerationsofparents.Whentheyoungfoxeswereborn,theresearchershand-fedthem.Theyalsoattemptedtotouchorpetthefoxeswhentheyweretwototwo-and-a-halfmonthsold,forstrictlymeasuredperiodsatatime.Iftheyoungfoxescontinuedtoshowaggressiveresponse,evenaftersignificanthumancontact,theywerethrownawayfromthepopulation—meaningtheyweremadeintofurcoats.Ineachselection,lessthan10%oftameindividualswereusedasparentsofthenextgeneration.Bythefourthgeneration,thescientistsstartedtoseedramaticchanges.Theyoungfoxeswerebeginningtobehavemorelikedogs.Theywaggedtheirtailsand“eagerly”soughtcontactwithhumans.By2005-2006,almostallthefoxeswereplayful,friendlyandbehavinglikedomesticdogs.Thefoxescould“read”humanhintsandrespondcorrectlytogesturesorglances.1、WhatdoweknowaboutBelyaev’sbreedingplan?A．Itexplainshowredfoxeswerebred.B．Itfocusesonhowtameanimalsevolved.C．Itexplainswhypetfoxesbecamepopular.D．Itconcentratesonwhytameanimalsdisappeared.2、Howdidhechoosehistestfoxesintheexperiment?A．Byappearance.B．Bycolor.C．Byreaction.D．Byflexibility.3、WhatcanbeinferredfromParagraph3?A．Smartfoxeswereusedfortesting.B．Thepurposeofselectionwasunclear.C．Friendlyfoxeswerekeptontesting.D．Theselectionwasnotexactandthorough.4、Whatisthedistinguishingcharacteristicofthefourthgenerationfoxes?A．Behavinginafriendlierway.B．Eatingplants.C．Havingdroopingears.D．Havingshortenedlegs.22．（8分）Haveyoueverrunintoacarelesscellphoneuseronthestreet?Perhapstheywerebusytalking,textingorcheckingupdatesonWeChatwithoutlookingatwhatwasgoingonaroundthem.Asthenumberofthisnew“species”ofhumanhaskeptrising,theyhavebeengivenanewname—phubbers（低頭族）.Recently,acartooncreatedbystudentsfromChinaCentralAcademyofFineArtsputthisgroupofpeopleunderthespotlight.Intheshortfilm,phubberswithvarioussocialidentities(身份)burythemselvesintheirphones.Adoctorplayswithhiscellphonewhilelettinghispatientdie,aprettywomantakesselfieinfrontofacaraccidentsite,andafatherloseshischildwithoutknowingaboutitwhileusinghismobilephone.Achainofsimilareventseventuallyleadstothedestructionoftheworld.Althoughtheendingsoundsoverstated,thedamagephubbingcanbringisreal.Yourhealthisthefirsttobeartheeffectandresultofit.“Constantlybendingyourheadtocheckyourcellphonecoulddamageyourneck,”GuangmingDailyquoteddoctorsassaying.“theneckislikearopethatbreaksafterlong-termstretching.”Also,staringatcellphonesforlongperiodsoftimewilldamageyoureyesightgradually,accordingtothereport.Butthat’snotall.Beingaphubbercouldalsodamageyoursocialskillsanddriveyouawayfromyourfriendsandfamily.Atreunionswithfamilyorfriends,manypeopletendtosticktotheircellphoneswhileothersarechattinghappilywitheachotherandthiscreatesastrangeatmosphere,QiluEveningNewsreported.Itcanalsocostyouyourlife.Therehavebeenlotsofreportsonphubberswhofelltotheirdeath,sufferedaccidents,andwererobbedoftheircellphonesinbroaddaylight.1、ForwhatpurposedoestheauthorgivetheexampleofacartooninParagragh2?A．Toinformpeopleofthebadeffectsofphubbing.B．Toadvertisethecartoonmadebystudents.C．Toindicatetheworldwillfinallybedestroyedbyphubbers.D．Towarndoctorsagainstusingcellphoneswhiletreatingpatients.2、WhichofthefollowingisNOTariskaphubbermayhave?A．Hissocialskillscouldbeaffected.B．Hisneckandeyesightwillbegraduallyharmed.C．Hewillcausethedestructionoftheworld.D．Hemightgetseparatedfromhisfriendsandfamily.3、Whichofthefollowingmaybetheauthor’sattitudetowardsphubbing?A．Supportive.B．Opposed.C．Optimistic.D．Objective.4、Whatmaythepassagetalkaboutnext?A．Adviceonhowtouseacellphone.B．Peopleaddictedtophubbing.C．Measurestoreducetherisksofphubbing.D．Consequencesofphubbing.23．（8分）BikeShareTorontoisthecity’sofficialbikeshareprogram,designedtogivelocalsandvisitorsafun,affordableandconvenientalternativetowalking,taxis,busesandthesubway.Thereare200BikeShareTorontostationsand2,000bikesacrossthecity,makingBikeSharethemostaccessiblewaytogetaroundandexplore.Howitworks●BecomeanAnnualMemberorbuyadayPasstoaccessthesystem.●Findanavailablebikenearby,andgetaridecodeoruseyourmemberkeytounlockit.●Takeasmanyshortridesasyouwantwhileyourpassormembershipisactive.●Returnyourbiketoanystation,andwaitforthegreenlightonthedock(停靠點(diǎn))tomakesureit’slocked.Chooseaplan●ForvisitorsDayPass:$7.Unlimited30-minuteridesina24-hourperiod.3-DayPass:$15.Unlimited30-minuteridesina72-hourperiod.●ForlocalsMonthlyPass:$25.Unlimited30-minuteridesforamonth.AnnualMembership:$90.Unlimited30-minuteridesforawholeyear.TheAnnualMembershipisthebestdealforlocalsofTorontoandotherfrequentriders.Thefirst30minutesofeachrideisincludedwiththemembershiporpassprice.Avoidextrafeesbydroppingoffyourbikeevery30minutesatanyotherstation.Ifyoukeepabikeoutforlongerthan30minutesatatime,youwillbechargedanextra$1.50forthefirst30minutesover,$4forthenext30minutes,and$7foreachadditional30minutesafterthat.Contactus●CustomerService:(855)898-2388●RepairService:(855)-2378●CorporationPartners:(855)898-2398●EmploymentOpportunities:(855)898-24981、WhichisthemostsuitablechoiceforlocalsinToronto?A．DayPassB．3-DayPassC．MonthlyPassD．AnnualMembership2、Howmuchwilltheextrafeebeifyoutravelfortwohoursbybike?A．$5.5B．$9.5C．$12.5D．$15.53、FormoreinformationaboutworkingatBikeShareToronto,whichofthefollowingnumbersisforcontact?A．(855)898-2399B．(855)898-2378C．(855)8989-2398D．(855)898-249824．（8分）HaveyouevernoticedhowAmericansfilluptheirentireglasswithiceandthenpourtheirbeverage(飲品)in,butEuropeanstaketheirdrinksatroomtemperature?IntheU.S.,we’vecreatedfridgesthatgiveyoucoldiceatthepressofabutton,butinBritaintheytypicallyservetheirtapwaterwarm.Thistradition—ifthat’swhatyouwanttocallit-datesbacktothe19thcentury.Duringthattime,itwasalreadycommonplaceformostAmericanhomestohaveanicebox.IcewouldbeharvestedinnorthernAmericaorCanadaandshippedacrosstheAtlanticandsoldatahighpriceinBritishdepartmentstores.CanyouimagineheadingtoMacy’stotreatyourselftoablockofice?Puttingiceinyourdrinkstartedtobecomesomewhatofafashion(時尚)trendforthewealthyinBritain.Somewouldputafewcubesintheirchampagneandsipontheirchilleddrinksathigh-classparties.But,likewithanyfashiontrend,iteventuallyfaded,mainlybecausetheicewasjusttooexpensive.AndevenonceiceboxesbeganappearinginhomesinBritainaswell,Britsnevertookalikingtoiceintheirdrinks.So,nexttimeyoutraveloverseas,don’tfeeloffended(冒犯)whenyourservergivesyouaneyerollwhenyouaskforicewater.1、Whohaswrittenthetext?A．AEuropean.B．AnAmerican.C．ACanadian.D．AnAsian.2、WhydoEuropeanstaketheirdrinksatroomtemperature?A．Becausetheyhavenofridges.B．Becausetheyhavewarmtaps.C．Becausetheyareaccustomedtoit.D．Becausetheycan’taffordice.3、WhatcanweinferaboutBrits?A．Theytreattheirgueststocolddrinks.B．TheyalwaysfollowwhatAmericansdo.C．Theydon’tknowwheretogeticeblocks.D．TheyhaveiceboxeslaterthanAmericans.4、Whatdoesthetextmainlytalkabout?A．WhyAmericanslikeicydrinkswhileEuropeansdon’t.B．Whenpeopleoverseashaveicydrinkswiththeirmeals.C．Wherepeoplecanentertainthemselveswithicydrinks.D．HowEuropeansandAmericansmakedifferentbeverage.25．（10分）Children’sliveshavechangedgreatlyoverthelast50years.ButdotheyhaveahappierchildhoodthanyouorIdid?It’sdifficulttolookbackonone’sownchildhoodwithoutsomeelementofnostalgia(懷舊的).Ihavefourbrothersandsisters,andmymemoriesareallaboutbeingwiththem.Playingboardgamesonthelivingroomfloor,orspendingdaysinthestreetwiththeotherneighborhoodchildren,racingupanddownonourbikes,orexploringthenearbywoods.Myparentsscarcelyappearinthesememories,exceptasproviderseitherofmealsorofsevereblameaftersomeparticularlyriskyadventure.Thesedays,intheUKatleast,thenatureofchildhoodhaschangeddramatically.Firstly,familiesaresmaller,andtherearefarmoreonlychildren.Itiscommonforbothparentstoworkoutsidethehomeandthereisthefeelingthattherejustisn’ttimetobringupalargefamily,orthatnoonecouldpossiblyaffordtohavemorethanonechild.Asaresult,today’sboysandgirlsspendmuchoftheirtimealone.Anothermajorchangeisthatyoungsterstodaytendtospendahugeamountoftheirfreetimeathome,inside.Morethananythingthisisduetothefactthatparentsworryfarmorethantheyusedtoaboutrealorimagineddangers,sotheywouldn’tdreamoflettingtheirchildrenplayoutsidebythemselves.Finally,thekindoftoyschildrenhaveandthewaytheyplayistotallydifferent.Computerandvideogameshavereplacedtheboardgamesandmoreinterestingactivitiesofmychildhood.Theirony(令人啼笑皆非的事情)isthatsomanywaysofplayinggamesarecalled“interactive”.Thefactthatyoucanplayelectronicgamesonyourownfurtherincreasesthesenseoflonelinessfeltbymanyyoungpeopletoday.DothesechangesmeanthatchildrentodayhavealessrelaxingchildhoodthanIhad?Ipersonallybelievethattheydo,butperhapseverygenerationfeelsexactlythesame.1、Whatisthepurposeofthedirectquestiongiveninthefirstparagraph?A．Togetpeople’sattentionandleadinthetopicB．Togatherpeople’sopinionsonchildhoodC．ToshowwhothepassageiswrittenforD．Tocomparethechildhoodlivesoftwogenerations2、WhichisNOTareasonforthechanges?A．FamiliesaresmallertodayB．ParentsworriedtoomuchabouttheirchildrenC．ToyscanbeplayedbychildrenaloneathomeD．It’stoodangeroustoplayoutside3、Whathasthewriterfocusedoninthefourthparagraph?A．Youngpeopletodayshouldn’tplayelectronicgamesB．Somegamesthatyoungpeopleplaytodayaren’treallygoodC．ComputerandvideogameshavereplacedtheboardgamesD．Boardgamesaremuchmoreinterestingthancomputergames4、Thewriter’sattitudetowardsthechildhoodchangingis.A．a(chǎn)pproving B．unconcernedC．objective D．optimistic第三部分語言知識運(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四個選項中，選出可以填入空白處的最佳選項．26．（30分）Iusedtobelievepolitenesswasathingofthepast.VeryseldomhaveI1apolitehumanbeinginthismodernsociety.However,Ihadto2mythinking,whenI,withtwoofmygrown-updaughters,camefacetofacewithsuchagentlemaninacoffeeplace.Theplacewas3withcustomersandwehadtoclimbsteepstairstofindanemptytable.4enjoyingcoffeeandsnacks,wewentdownthe5stairs,wheretherewashardlyanyspaceforanotherpersontoeither6orcomedown.JustasIwasinthemiddleofmydescent(下降),agentlemanenteredthemainentrancewhichwas7infrontofthestaircase.IwassureIwouldbe8roughlybythismangoingup.IkeptcomingdownasfastasIcould.Mysmartdaughterswerealreadydown,lookingupatme9,hopingIwouldreachthembeforethestrangerstartedupthestairs,knowingIwasa10sort.11reachingmydaughters,Inoticedthemanstillstandingnearthedoor.Ireachedthemandpassedthe12attheentrancedoorwhichhe13holdingopen.Ilookedbackthinkinghewasstillatthedoor,decidingwhethertogoin14findanotherlesscrowdedplace.IsawhimgoingupthestairsandItoldmydaughtersaboutit.Wethreefelt15thatwedidnoteven16thepolitegentlemanwhowasactually17thedooropenforusladies.We18hiskindness,forsuchwell-manneredpeopleare19tofindthesedays.20Irememberthisgentlemanandpraythattherewillbemorehumanbeingslikehim.1、A．broughtupB．turneddownC．comeacrossD．a(chǎn)ppealedto2、A．changeB．shapeC．confirmD．identify3、A．providedB．equippedC．spottedD．crowded4、A．BeforeB．AfterC．WhenD．Upon5、A．wideB．highC．narrowD．low6、A．turnaroundB．setoffC．reachoutD．goup7、A．rightB．muchC．closelyD．directly8、A．pushedB．injuredC．a(chǎn)rrestedD．denied9、A．worriedlyB．delightedlyC．heartilyD．sadly10、A．genuineB．pessimisticC．dynamicD．nervous11、A．HardlyB．NearlyC．SlightlyD．Previously12、A．daughtersB．waiterC．strangerD．manager13、A．a(chǎn)voidedB．keptC．enjoyedD．resisted14、A．a(chǎn)ndB．butC．orD．so15、A．innocentB．sensibleC．jealousD．a(chǎn)shamed16、A．a(chǎn)wardB．remindC．thankD．consult17、A．holdingB．crashingC．seekingD．forcing18、A．distinguishedB．a(chǎn)pplaudedC．commentedD．witnessed19、A．easyB．rareC．unlikelyD．common20、A．IngeneralB．AtlengthC．TillnowD．Byaccident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(dāng)?shù)膯卧~或括號內(nèi)單詞的正確形式。27．（15分）Recently,anIndianfilm“HindiMedium”hasmade1．hit!Ittoldastorythatacouplesparednoeffort2．(give)theirdaughterthe3．(good)educationandfinallyshewasacceptedbytheeliteofDelhi.Actually,thisphenomenoncanalsobeseeninChina.Todaymoreandmoreparentsadopttheideaof''personalqualityeducation”andcommittoencouragingtheirchildrentocultivateavarietyofinterestsoutsidethe4．(tradition)classroomactivities,likeplayingtheviolin,robotprogrammingandsoon.Butparticipating5．toomanyextracurricularactivitiesdoesdeprivethechildrenoftheirplaytime.It6．(point)outthatmoreChineseparentsneedtorealizethatthehand-holdingmentalityisoverwhelmingtheirchildren.Theyhavetoloosentheircontrol,givethekidstimeof7．（they）own,andletthemtaketheinitiative.Todayparentsworry8．（endless）aboutpreparingthekidsfortherealworld,abattlefieldwhereeveryonemustarmthemselvesforafight.Butthereisnodenying9．thebesttimesinlifearethose10．（steal）momentswespendwithothers-anidleafternoonwithabelovedcompanion,acupofteawithanoldfriend,orasimplegameoftagwithclassmatesafterschool.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。錯誤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。Asmymotherandfatherwerealwaysbusyworking,soIwasoftenathomebymyself、IfeltboringallthetimeandIfeltsorryformyself、Oneday,inmywayhomefromschool,Isawapersonlivinginthepark、Hewaswearingdirtybutworn-outclothes、Hegavemeabigsmilewhenhesawme、Helookedifhewasthehappiestmanintheworld、Lookedathim,IrealizedhowluckilyIreallywas、IhaveenoughfoodtoeatandenoughclothestowearandIhadhard-workingparentswhoreallycaredabouthim、IrealizedwhatgratefulIwastomyparentsforallthatIhad、第二節(jié)書面表達(dá)（滿分25分）29．（25分）假如你是高中生李華，得知你校交換生英國朋友Brown對中國傳統(tǒng)文化藝術(shù)很感興趣，寫信邀請他一起去看京劇。主要內(nèi)容：1.簡介：京劇(BeijingOpera)歷史悠久，服裝(costume)色彩艷麗，講述歷史故事等。2.告知地點(diǎn)、約定時間、購票安排等。注意:1.詞數(shù)100左右；開頭、結(jié)尾已給出。2.可以適當(dāng)增加細(xì)節(jié)，以使行文連貫。DearBrown,I’mLiHua.______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Lookforwardtoyourearlyreply.Yours,LiHua

參考答案第一部分（共20小題，每小題1.5分，滿分30分）1、B2、A3、A4、C5、C6、B7、A8、D9、B10、B11、A12、B13、D14、B15、C16、A17、A18、A19、A20、C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、Manyteensinhighschoolwanttotryoutforsports.Alotofthemtryoutbecausetheythinkitwillmakethempopularorgetthemmoredates.Whilethismayseemlikeasillyreason,therearelotsofotherbenefitstosportsthatyourchildrenmayfailtonotice.WithTV,movies,computersandvideogamesbecomingmoreandmorepopular,ithasbecomesomucheasierforteenstobebythemselvesratherthangoingoutwithfriends.Kidsusedtogohangoutatthemallordrivearoundtown;nowtheyjustsitathome.Gettingyourteensintoasportgivesthemachancetogooutandspendtimewithotherpeoplesocially.Whiletheymaynotfindanewbestfriend,theywilllearnhowtocommunicatewithoneanotherandworkasateamandthey’llfindsomethingusefullaterinlife.Moreandmorekidsarebecomingoverweight.Joiningateamsportwillhelpteensgetoutandgetsomeexercisewithoutfeelingpressuredtoloseweightorgetinshape.What’smore,ifyourteensseethattheirphysicalconditioniscausingthemtounder-perform,theymaybeencouragedtodootheractivitiestogethealthy.Bythetimeyourchildrenreachtheirteenageryear,partofgoodparentingwillbeprovidingthemwithdirectionandencouragementandcontinuingtohelpthemdevelopahealthystyleofliving.Thesedays,it’sbecominghardertoshowyourteenagersthatyouloveandsupportthem.Agreatwaytodothisisbyshowinguptotheirgame,helpingthempractice,andhelpingwithteamfundraisers.Thesearealsogreatwaystospendtimewithyourkidsandtalk