2026届甘肃省张掖市山丹县一中高三英语第一学期期末监测模拟试题

2026届甘肃省张掖市山丹县一中高三英语第一学期期末监测模拟试题注意事项：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．Alongwiththeemailwasmybrother’spromise______Icamefirstinthecompetition,hewouldbuymeanMP4.A．what B．that C．thatif D．whether2．---Wewantsomeonetodesignthenewartmuseumforme.---_____theyoungfellowhaveatry?A．Shall B．May C．Will D．Need3．MoreexpresswaysinSichuansoontopromotethelocaleconomy.A．arebeingbuilt B．willbebuiltC．havebeenbuilt D．hadbeenbuilt4．Iappreciate______theopportunitytoworkinyourcompanytwoyearsago.A．giving B．togive C．beinggiven D．tobegiven5．—YoualllikeyourEnglishteacher?—Yeah,shedevotesherself____toteachinganditearnsheragoodreputation．A．originally B．extremely C．obviously D．entirely6．“MadeinChina2025”aimstotransformChinafromaproduct-makingfactoryintoaproduct-makingpower,______________drivenbyinnovationandemphasizingqualityoverquantity.A．theonethat B．onethatC．one D．theone7．WatchingbasketballgamesonTVathomeisonething,goingtowatchthem________liveisquiteanother.A．perform B．performing C．toperform D．beingperformed8．—Lookingbackon_____inyearsgonebyandthegoodtimethatIhadmakestodayseemrathersad.—Absolutely.Somuchhaschanged.A．howitwas B．whoitwas C．howwasit D．whowasit9．Thegovernor’sstatementonemployment________astormofcriticism,A．setupB．setoutC．setaboutD．setoff10．Varietiesofsolutionshavebeenprovidedforustosolvetheproblem.Wecanchoose________tostartwith.A．it B．that C．each D．one11．—DoyouthinkI'magoodsurfer?—Ofcourse!I________youearlier．Youmadeitlooksoeasy，gracefuleven．A．amwatching B．waswatchingC．havewatched D．hadwatched12．WhitneyHouston’ssuddendeathsuggeststhatdrugabuseissuchaseriousproblem________weshoulddealwithitappropriately.A．as B．that C．which D．where13．---Whereistheplane？Ican'tseeit.---Itwentoffits________________tokeepawayfromthesuddenstorm.A．course B．roadC．flight D．direction14．—Whatdidshewanttoknow,Tom?—ShewonderedwecouldcompletetheexperimentA．whenwasitthatB．itwaswhenthatC．itwaswhenD．whenitwasthat15．---TurnofftheTV,Jack.Yourhomeworknow?---Mum,justtenmoreminutes,please.A．ShouldyoubedoingB．Couldn’tyoubedoingC．Shouldn’tyoubedoingD．Willyoubedoing16．----Ifeelcold.____Iclosethewindow?----Sure.Goahead!A．ShallB．NeedC．WouldD．Should17．---Whatcausedthepartytobeputoff?---______theinvitations.A．Tomdelayedsending B．Tom’sdelayingsendingC．Tomdelayingtosend D．Tomdelayedtosend18．People________withanyonewhoisalwaystalkingabouthowwonderfulheis.A．fallin B．keepcompany C．catchup D．getfedup19．Davewasa________.Becauseofhismisconductinclass,thewholeclasshadtostayafterschool.A．wetblanketB．leadinglightC．blacksheepD．darkhorse20．Scientistshavecometotheconclusion___________thetemperatureonEarthisgettinghigherandhigher.A．What B．thatC．which D．when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）Createdin1998byCaseyandShelleyBlack，theNorthernLightsWildlifeWolfCenterfocusesonnotonlyrescuingyoungabandonedwolvesbuteducatingthepublic．Unlikeothercenters，youcanactuallywalkwiththewolvesandhaveexciting，hands﹣oninteractionwiththemhere．Andso，wegatheredonelatewintermorningtolearn，prepareandwalk．ScrappyandFlora，ourwolvesthatday，werebroughttothecenterwhenonlyafewdaysold．"Theylivedinthehousewithusforthefirstseveralmonths．Wetreatedthemlikehumanbabies，fedthemandsleptwiththem，"saidShelley．So，theyaretotallyusedtopeople．However，thesearewildanimals．Forthatreason，ShelleyandCaseyexplained，thewalkistotallyonthewolf'sterms．"Wedon'tapproachthem，butiftheycomeuptous，wecantouchthem．"Withallthisinmind，weheadedforthewoods．Wewerewalkingonaloggingroadwhensuddenly，Flora，all60poundsofher，hurrieduptomeandraiseduponherlegs．Shewasalmostastallasme．Assheleanedin，putherhugemuddypawsonmyshouldersandsniffedmyface，apparentlyshewassayinghelloinwolftalk．Wewalkedfarther，maybehalfamile，whileScrappyandFloradashedinandoutofthewoodsstoppingtooccasionallyrollinthesnow，digforthisorthatandjustplay．Thenweallheadedintothetreestoapicturesquestreamwherethewolvessplashed，drankandhadagreattime．Onecouldpointoutthatthiswholeadventurewasstagedandquiteartificial．Butthepurpose，CaseyandShelleysaid，istoexplainthewolves'placeintheenvironmentand，primarily，toletpeopleknowwolvesdon'thavetobeuniversallyfeared﹣theyreallydon'thidesecretlyinthewoodsjustwaitingtoeatpeople，butthey'dratheravoidpeople，forthemostpart．1、HowistheNorthernLightsWildlifeWolfCenterdifferentfromothers？A．Ittrainsandeducateswildwolves．B．Itaimstorescueyoungabandonedwolves．C．Itraiseswolvesforcommercialpurposes．D．Itallowsvisitorstotakeawalkwithwolves．2、WhatcanbeinferredfromShelleyandCasey'sexplanationinParagraph2？A．Thewalkcanbepotentiallydangerous．B．Thewolveshavelostalltheirwildness．C．Peopleshouldgetclosetothewolvesactively．D．Thewolvescanreadpeople'smindlikehumanbabies．3、WhydidFlorabehavelikethatwhenshesawtheauthorontheloggingroad？A．Toexpresscuriosity．B．Toshowfriendliness．C．Toattractattention．D．Toseekcompanionship．4、WhydoCaseyandShelleyorganizesuchanadventure？A．Toadvertisethecenter．B．Topublicizewolfhunting．C．Topromoteenvironmentalprotection．D．Toclarifysomeconventionalviewsofwolves．22．（8分）Jobsquicklybecameboredwithcollege.HelikedbeingatReed,justnottakingtherequiredclasses.Infact,hewassurprisedwhenhefoundoutthattherewerestrictcourserequirements.WhenWozniakcametovisit,Jobswavedhisscheduleathimandcomplained,“Theyaremakingmetakeallthesecourses.”Wozniakreplied,“Yes,that’swhattheydoincollege.”Jobsrefusedtogototheclasseshewasassignedandinsteadwenttotheoneshewanted,suchasadanceclasswherehecouldenjoyboththecreativityandthechancetomeetgirls.“Iwouldneverhaverefusedtotakethecoursesyouweresupposedto,that’sadifferenceinourpersonality.”saidWozniaksurprisedlyandadmiringly.Jobsalsobegantofeelguiltyaboutspendingsomuchofhisparents’moneyonaneducationthatdidnotseemworthwhile.“Allofmyworking-classparents’savingswerebeingspentonmycollegetuition(学费).”hedetailedhisexperienceinafamousceremonyaddressatStanford.“IhadnoideawhatIwantedtodowithmylifeandnoideahowcollegewasgoingtohelpmefigureitout.AndhereIwasspendingallofthemoneymyparentshadsavedtheirentirelife.SoIdecidedtodropoutandtrustthatitwouldallworkoutokay."Hedidn’tactuallywanttoleaveReed；hejustwantedtoquitpayingtuitionandtakingclassesthatdidn’tinteresthim.Surprisingly,Reedtoleratedthat.“Hehadaveryinquiringmindthatwasenormouslyattractive,”saidthedeanofstudents,JackDudman.“Herefusedtoacceptautomaticallyreceivedtruths,andhewantedtoexamineeverythinghimself.”DudmanallowedJobstoauditclassesandstaywithfriendsinthedormsevenafterhestoppedpayingtuition.“TheminuteIdroppedoutIcouldstoptakingtherequiredclassesthatdidn’tinterestme,andbegindroppinginontheonesthatlookedinteresting,”hesaid.Amongthemwasacalligraphy(书法)classthatappealedtohimafterhesawpostersoncampusthatwerebeautifullydrawn.“Ilearnedaboutserifandsansseriftypefaces(字体),aboutvaryingtheamountofspacebetweendifferentlettercombinations,aboutwhatmakesgreattypographygreat.Itwasbeautiful,historical,artisticallyfineinawaythatsciencecan’tcapture,andIfounditfascinating.”ItwasyetanotherexampleofJobsconsciouslypositioninghimselfattheintersection(相交点)oftheartsandtechnology.Inallofhisproducts,technologywouldbemarriedtogreatdesign,elegance,humantouches,andevenromance.“IfIhadneverdroppedinonthatsinglecourseincollege,theMacwouldhaveneverhadsomanytypefaces.AndsinceWindowsjustcopiedtheMac,it’slikelythatnopersonalcomputerwouldhavethem.”MeanwhileJobshadahardtimeatReed.Hewentbarefootmostofthetime,wearingsandalswhenitsnowed.ElizabethHolmesmademealsforhim,tryingtokeepupwithhisobsessivediets.Hereturnedsodabottlesforsparechange,continuedhislonghardjourneystothefreeSundaydinnersattheHareKrishnatemple,andworeadownjacketintheheatlessgarageapartmentherentedfor$20amonth.Whenheneededmoney,hefoundworkatthepsychologydepartmentlabmaintainingtheelectronicequipmentthatwasusedforanimalbehaviourexperiments.OccasionallyChrisannBrennanwouldcometovisit.Theirrelationshipdevelopedabnormally.Butmostlyhetendedtothebeginningofhisownsoulandpersonalgoalforenlightenment(开明).“Icameofageatamagicaltime,”hereflectedlater,“OurconsciousnesswasraisedbyZen,andalsobyLSD．”Evenlaterinlifehewouldcreditcertaindrugsformakinghimmoreenlightened.“TakingLSDwasavaluableexperience,oneofthemostimportantthingsinmylife.LSDshowsyouthatthere’sanothersidetothecoin,andyoucan’trememberitwhenitwearsoff,butyouknowit.Itheightenedmysenseofwhatwasimportant—creatingwonderfulthingsinsteadofmakingmoney,puttingthingsbackintothestreamofhistoryandofhumanconsciousnessasmuchasIcould.”1、JobsandWozniakdifferedin________.A．approachtofreedomB．appetiteforknowledgeC．attitudetorequirementsD．affectionforcollegelife2、OnefactorinJobs’decisiontoleavecollegeisthat________.A．hisfamilywasinabsolutepovertyB．hewantedtobeindependentofhisparentsC．hewouldn’thavehisparents’moneywastedD．thecollegecouldn’tpreparehimforhissetgoal3、FromJackDudman’sstatementwecanseethatJobswas________.A．ratherdifficulttogetalongwithB．quitegoodatsolvingproblemsC．toostubborntochangehismindD．veryseriousaboutexistingbeliefs4、Theunderlinedword“audit”inParagraph3means“________”.A．attendinformallyB．missoccasionallyC．givesuccessfullyD．conductirregularly5、Jobsworkedontypefaceswhilesufferingfromahardlife________.A．toprovehisvaluetothewholeworldB．tobringsomethinggreatintoexistenceC．tomakehimselfwealthyforabetterlifeD．toshowcollegewasunimportanttohim6、Whichofthefollowingcanbethepropertitleforthepassage?A．StayOutB．DropOutC．HoldOutD．WorkOut23．（8分）MyhusbandandIwanteddesperatelytheinstanttransformationfromtypicalconsumerstoeco-consciouspeople．WeswitchedourlightbulbstoCFL(compactfluorescentlight)bulbstoconserveenergy．Wewentaboutthehouseturningofflightsandunpluggingappliancesthatweren’tinuse．Buttherateofglobalwarmingexceededoursnail’spaceconversiontogreenhood．SoIpressedonward．Idecidedtoputveganism(素食主义)atthetopofouragenda．Vegansrefuseanyanimalfleshorcommercialgoodsmadefromanyanimalbyproductssuchasmilkorfats．Allthefamilyapplaudedthisoptionexceptformyhusband．Somekindofanimalneededtosacrificeitsdearlifeforhismealoritwash’tdinner．Icookedupastorm，strugglingtopreparenutritiousmealsdominatedbynot-so-obviousvegandisheslikebeanburritosandhigh-fibervegetablestir-fry．Ittookafewdaysbeforeherealizedthathehadn’tbeeneatinganymeat．“Ifeellikeeatingbeef．”heannounced．Sothatnight，Itookfulladvantageofazucchini(一种南瓜)，cutitintochunky(粗大的)piecesandcookedthem．ThenIcoveredthemwithspices．Mybeef-starvedhusbandhadsomeandacuriouslookcrossedhisface．“Where’sthebeef?”“Livingpeacefullysomewhereonanopenplainwhereitbelongs．”“Iknewit”hemurmured．“You’vesurelymadegreatcontributionstotheboomincattle.”Histastebudsweredevelopedcompletelyaroundtheflavorofeverykindofanimal：cattle，pigs，deer，lamb，chickensandducks．Convertinghimwaslikefeedinggrasstoalion．I’mallforpreservingourplanet，butwhatgoodwoulditdotosavetheearthfortomorrow’sgenerationiftoday’sdiedofstarvation?Thenextday，wewentoutforburgers．Iwasverycarefultoplacethepaperbagintoourrecyclingbin．1、Whichofthefollowingbestexplains“exceeded”underlinedinParagraph1?A．Defeated． B．Absorbed．C．Bound． D．Distributed．2、Whatdoweknowabouttheauthor’shusbandfromParagraph2?A．Hesupportedthemeat-freediet． B．Hewasapreserverofanimals．C．HewasregardedasameatLover． D．Heplayedadominantroleincooking．3、Whatdoweknowabouttheauthor?A．Shehadagoodsenseofhumor． B．Shesuccessfullytransformedherhusband．C．Sheadvocatedraisingmorecattle． D．Shehadaperfectrecipeforcookingmeals．4、Whatcanbeasuitabletitleforthetext?A．HungerorAnger? B．DiscriminationorAppreciation?C．VegetablesorMarbles? D．GreensorLions?24．（8分）Asfamiliesgetreadytoheadbacktoschoolforthefall,parentsareonatightbudgetlogetalltherightsuppliespurchased,paperworkfilledoutandphysicals(体检)scheduled.Itcanbeatoughtimeofyearandmanyparentsstruggletofindthetimeandmoneytomakeithappensmoothly.That’swhereHeartlandCommunityHealthCentercanhelp.Inordertogetkidsofftoahealthystarttotheschoolyear,Heartland,withsupportfromConnectChurch,willbefocusingontheback-to-schoolneedsoffamiliesduringtheweekofAug.7—11,andbeyond.Duringtheeventweek,Heartlandwillofferreduced-costschoolphysicalsbyappointmentonly.Freebackpacksfilledwithvariousschoolsuppliesandfreetoothpastetoprotectteeth,alongwithotherhelpfulinformation,willbeavailableonawalk-inbasisduringeventhours.The2017BackToSchoolwithHeartlandeventwillbeheld:Monday—Thursday2:00p.m.—5:00p.m.andFriday1:00p.m.—3:00p.m.,Aug.7—11.However,reducedcostsforphysicalswillbeavailablethroughSept.30thisyear,forthosewhoareunabletoscheduleanappointmentduringtheeventweek.Heartland’sregularclinichoursareasfollows:Monday&Wednesday:8:00a.m.-5:00p.m.;Tuesday&Thursday:8:00a.m.-7:00p.m.;Friday:8:00a.m.—3:00p.m.HeartlandisaLevel3Patient-centeredMedicalHomeandaHealthCenterservingDouglasCountyandsurroundingareaswithprimarycare,behavioralhealthandassistanceprograms.Servicesareavailabletoall,regardlessofincomeorinsurancestatus.Heartlandislocatedat346MaineSt.,Ste.150inLawrence,KS,andalsooffersanofficeinsidetheLawrence-DouglasCountyHealthDepartmentat200MaineSt.1、WhatcanpeoplegetfromHeartlandduringeventhours?A．Pick-upservice.B．Freeschoolsupplies.C．Reduced-costtechnicaltraining.D．Helpintheformofmoney.2、WhencanyouvisitHeartland’sclinic?A．At5:00p.m.onFriday.B．At7:00p.m.onMonday.C．At9:00a.m.onWednesday.D．At7:00a.m.onThursday.3、WhatinformationaboutHeartlandcanwegetfromthetext?A．Itsdevelopmenthistory.B．Thenumberofitsmembers.C．Itsfounder.D．Itsaddress.25．（10分）Almostoneinfivedrivershaddozedoffbehindthewheel,ashockingnewsreporthadshowed.Ofthosewhoweredozingoff,29%havedonesowiththeircarsspeedingat70milesperhour.Thereportalsofoundaquarterofmenhavefallenasleepwhiledriving,makingitalmosttwiceasmanyaswomen.TheSafetyonWheelReport,byPostOfficeInsurance,alsolookedathowoftentirednessoralackofconcentrationcausedaccidents.Threeintendrivershaveexperiencedanaccident,frompassingawalkercrossingtohittinganothervehicle,becauseofalackofconcentration.Meanwhile,almosthalf(49%)ofUKdrivershavedrivenwhentheydonotconcentrate.PaulHavenhand,headofinsuranceatPostOffice,said,“Whentirednessstrikes,driversshouldavoidtheroads.”Thereisnomeasurementfortireddriving,unlikedrivingundertheinfluenceofalcohol,yetitcouldresultinanequallydangerousaccident.Driversareadvisedtotakea15-minutebreakfromdrivingeverytwohours.However,athird(36%)aresoeagertoreachtheirdestinationthattheywillignorefeelingsoftiredness.What’smore,almostoneinfive(18%)willdriveforlongerthanfourhourswithoutabreak,while6%carryonforupto6hours.Justoveraquarter(27%)chooseaquickstoptobuyacupofcoffee,whichisaverypopularwayfordriverstogetridoftiredness,andonly17%stoptohavearestuntiltheyfeelenergeticagain.Mr.Havenhandadded,“Driversshouldplanaheadandrestbeforestartingalongjourney;besides,theycantakeregularbreakstorechargetheirbatterieswhileonroad;insomecases,iftheydofeeltootiredtoconcentrateontheroads,theycouldconsideranalternativemeansoftransport.”1、WhichsuggestionisNOTputforwardbyMr.Havenhand?A．Preparingwellforalongjourneyandtakingacompleterestbeforeit.B．Havingbreaksregularlyinordertofeelrefreshed.C．Choosinganothermethodoftransportinstead.D．Choosingaquickstoptograbsomethingtoeat.2、Whatdoestheunderlinedphrase“rechargingtheirbatteries”inthelastparagraphmean?A．Putanewsupplyofelectricityintotheirbatteries.B．Getbacktheirenergybyrestingforawhile.C．Accusethemofstealingbatteries.D．Paytwicemoremoneyfortheirbatteries.3、Itisimpliedinthelastparagraphthatfordriversthemostpopularcurefortirednessis_____.A．drinkingcoffeeB．talkingwithothersC．ignoringfeelingsoftirednessD．singingsongs4、What’sthepurposeofthewriterinwritingthispassage?A．Towarnpeopleofthedangeroftireddriving.B．Totellpeopletobecarefulwhenwalkingonthestreet.C．Toinformpeopleoftheimportanceofagoodrest.D．Tointroducesomedangerswhiledrivingontheroads.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）OnemorningIwastednearlyanhourwatchingatinyantcarryahugefeather.Severaltimes,it31severalobstaclesinitspath.Andafteramomentarypauseitwouldmakethenecessarydetour(绕道).32onepoint,theanthadtocrossacrackabout10mmwide.Aftersome33thoughts,theantlaidthefeatheroverthecrack,walked34itandpickedthefeatherupontheotherside,thencontinuedonitsway.Iwas35bytheclevernessofthisant.Itwasonlyasmallinsect,lackingin36yetequippedwithabraintoreason,explore,discoverandovercome.37thisant,liketheothertwo-leggedcreatures38ontheearth,alsoshareshumanfailings.Aftersometimetheant39reacheditsdestination—aflowerbedandasmallholethatwastheentrancetoits40home.Itwastherethattheantmetits41.Howcouldthatlargefeatherpossibly42suchasmallhole?Ofcourse,itcouldn’t.Sotheant,afterallthis43andusinggreatbrightness,overcomingproblemsallalongtheway,justgaveupthe44andwenthome.Theanthadnotthoughttheproblemthrough45itbeganitsjourneyandintheendthefeatherwas46morethanaburden.Isn’tour47likethat?Weworryaboutourfamilies;weworryaboutthe48ofmoney;andweworryaboutallkindsofthings.Theseareallburdens—thethingswepickupalonglife’spath,anddragthemaroundtheobstaclesandoverthecracksthatlifewillbring,onlyto49thatatthedestinationtheyare50andwecan’ttakethemwithus.1、.A.broughtabout B．gotover C．cameacross D．dealtwith2、A．At B．For C．To D．With3、A．brave B．tiring C．magic D．short4、A．across B．through C．beside D．behind5、A．frightened B．attracted C．annoyed D．satisfied6、A．size B．height C．depth D．length7、A．Therefore B．But C．Moreover D．Otherwise8、A．working B．sleeping C．living D．walking9、A．probably B．suddenly C．easily D．finally10、A．underground B．lonely C．comfortable D．big11、A．partner B．match C．parent D．friend12、A．fit B．fix C．suit D．fill13、A．decision B．pleasure C．trouble D．matter14、A．insect B．problem C．hole D．feather15、A．after B．until C.before D．once16、A．nothing B．anything C．something D．everything17、A．study B．aim C．dream D．life18、A．waste B．lack C．worth D．danger19、A．think B．find C．wonder D．warn20、A．bad B．practical C．useless D．meaningful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）Dogsareoftencalled“man’sbestfriend”andmakeidealpets1．mostattractivequalityofadogisitsfaithinitsownerTheyalwaysgreetuswhenwecomehomeandtheywillneverleaveuseven2．adesperate(绝望的)situationForexample,therewasaverysickmanandhisdogbarkedandbarkeduntiltherescueteam3．(arrive)Furthermore,dogsarestronganimals4．willprotectusHouseswithdogsareconsideredmuch5．(safe)thanthosewithburglaralarms(防盗警报器)Notonlywilltheystopthieves,6．theywillalsoguardagainstfireForexample,therewasaseriousfireandadogmanaged7．(pull)itsowneroutAnd8．(final),dogscanbetrainedbypeopleDogscandoanumberofthingsthatpeoplecannotForexample,theycanfinddrugs,bodies,illegalDVDsandhuntdownprisonerswith9．(they)noseThey’realsousedtohelptheelderlyanddisabledTosumup,dogsarereallyfriendly,civilized(文明的)andloyal10．(partner)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。Breakingtrafficrulesandlitteringarecommoninthesedays,causedseriousharmtolifeandtheenvironment、Changingthissituationrequiredeveryone'seffort、Asforme,I'llkeeptrafficlawinmindallthewaytoschool、IfIridethebicycle,I'llalwayskeeptotherightandnevercrossaroadwhenthetrafficlightturnsg