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函数f(x)=的图象大致是( )
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高三下学期数学《》真题及答案
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正比例函数y=kxk≠0的图象在第二四象限则一次函数y=x+k的图象大致是
已知图甲是函数y=fx的图象则图乙中的图象对应的函数可能是
y=f(|x|)
y=|f(x)|
y=-f(-|x|)
y=f(-|x|)
已知函数fx=log2x+1将函数y=fx的图象向左平移一个单位再将图象上所有点的纵坐标伸长到原来的
已知函数y=fx的导函数f′x的图象如图所示试画出函数y=fx的大致图象.
正比例函数y=kxk≠0的图象在第二四象限则一次函数y=x+k的图象大致是
已知二次函数fx的图象如图所示则其导函数f′x的图象大致形状是
函数fx=lnx2+1的图象大致是
选项A
选项B.
选项C
选项D.
函数y=fx的图象与函数y=log3x的图象关于直线y=x对称则fx=________.
已知fx是定义在R.上的奇函数当x≥0时fx=2x-x2.1求函数fx的表达式并画出其大致图象2若当
函数y=fx处处可导且对任意x∈R.f′x>0恒成立当x1<x2时f′x1>f′x2则下列叙述正确的
函数y=f(x)单调递增且图象向下凹陷
函数y=f(x)单调递减且图象向上凸起
函数y=f(x)单调递减且图象向下凹陷
函数y=f(x)单调递增且图象向上凸起
已知函数y=xf'x的图象如右图所示则函数y=fx的大致图象是
已知导函数f′x的下列信息当14或x
函数y=fx的图象如图所示则导函数y=f′x的图象大致是
已知二次函数y=x2﹣2x﹣8.1求函数图象的顶点坐标对称轴及与坐标轴交点的坐标2并画出函数的大致图
函数y=fx的图象如图所示试画出导函数f′x图象的大致形状.
已知定义在R.上的函数fx其导函数f′x的大致图象如图所示则下列叙述正确的是
f(b)>f(c)>f(d)
f(b)>f(a)>f(e)
f(c)>f(b)>f(a)
f(c)>f(e)>f(d)
已知函数fx=|x|·a-xa∈R..1当a=4时画出函数fx的大致图象并写出其单调增区间2若函数f
若函数y=fx的图象如图所示则函数y=f1﹣x的图象大致为
若函数y=fxx∈R满足fx+2=fx且x∈[-11时fx=|x|.则函数y=fx的图象与函数y=l
已知正比例函数y=kxk≠0的函数值y随x的增大而减小则函数y=kx-k的图象大致是
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6分Differentcountrieshavedifferentcustomsespeciallyintablemanners.Somedininghabitsmaybeconsideredcivilizedinonecountrybutrudeinanother.Herearesomeinterestingfactsaboutsomecountries. France WheninFrancesplittingthebillAAwithfellowdinersshouldbeavoidedwhenpossible.You'reexpectedtooffertopaytheentirebillorsomeoneelseisexpectedtodg.so.OfcourseaccordingtoFrenchTodaytherearesomecasesWheresplittingthebillisOKlikewhendiningoutwithalargegroupofpeopleorwithcoworkers. Columbia Ifyou'reusedtocleaningyourplateyoumightwanttoconsidernotdoingsowhendininginColombiaIt'sconsideredrudetoleaveanemptyplatebecauseit'sasifyou'retellingyourhostthatheorshedidn'tgiveyouenoughfood. Australia InAustraliapeopletypicallyprefernottodiscussbusinessmattersoveramealaccordingtoEtiquetteScholarOfcourseitdependsonthepersonorgroupyou'rewithbutyoushouldpayattentiontoanycuesfromyourfellowdiningcompanionsforgoodmeasure. Kazakhstan InAmericait'sprettytypicaltogetannoyedwhenyourbaristadoesn'tfillyourcupalltheup.ButinKazakhstanitactuallyleaveyousatisfiedsinceitisagoodsign.AccordingtoEveryCulturehalf﹣filledcupsaremeanttokeepyourteawarmsinceyourhostwillcontinuouslyfillyourcupasawaytokeeptheinteractiongoingIfyourhostorserverweretofillyourcupwithteahoweveritisasignthattheymightwantyoutoleaveaccordingtoCommisceoGlobal. 1InFrancewithwhomissplittingthebillOKnowwhendining? A.yourchildren B.yoursweethearts C.yourcoworkers D.yourparents 2Inwhichcountryyouhadbetterleavesomefoodontheplate? A.France B.Columbia C.Australia D.Kazakhstan 3InKazakhstanifthehostfillsyourcupwithteaitmeansthat. A.youshouldleave B.youlikethetea C.youarethirsty D.theteatastesgood
15分Scotlandisauniqueplacewithlonghistorywhereyoucanfindnoble1palaceandcastles.Ithassomeof2mostbeautifulcitiesinEuropelivingwitnessofaproudandexcellentpast. 3discoverthetruesoulofScotlandtodaywehavetogotowardsthenorthernregionstotheGrampianMountainsItwasdifficulttofarmbuttheScotsdefeatedtheenvironmentwithstrongarms.Thehistoryofthisancientstruggleanditspeople'sancientloveforthehardlandare4apparentshownintheAngusFolkMuseum.Youcangetafeelofthetypicalruralatmosphereofpasttimesfromthedailyman﹣madeobjects5displayhere. FromcoastalAberdeen6theinsideoftheGrampianMountainsthererunstheCastleTrailaroadwithmanyfortresses要塞7arewitnessesof8continuefightsagainsttheruleofEnglandinScottishhistory. Another9attracthereisalegendarymonstertheLochNessMonster.Isthismonsterwhich10collectagood3000sightingsoverthelast50yearsrealorimaginary?Tomeetthecuriosityaboutitapriceof500000poundshasbeenputonthemonster'shead.
15分FormorethansixmillionAmericanchildrencominghomeafterschoolmeans1cometoanemptyhouse.SomedealwiththesituationbywatchingTV.Somemayhangoutoutside.2allofthemhavesomethingincommon.Theyspendpartofeachdayalone.They3calllatchkeychildren﹣theyarechildrenwholookafterthemselveswhiletheirparentswork.Andtheirbadsituationhasbecomeasubjectofconcern. Aheadmasterofanelementaryschoolsaidthattherewasaschoolruleagainstwearingjewelry.Alotofkidshadchainsaroundtheirneckswithkeys4attach.Hewasconstantlytellingthemtoputtheminsideshirts.Thereweresomanykeysallof5werehousekeys. Hebegantalkingtothechildrenwhohadthem.Thenhelearnedtheinfluencethatworkingcouplesandsingleparentswerehaving6theirchildren.Fearisthebiggestproblemfacedbychildrenathomealone.Manyhadnightmaresandwereworriedabouttheirown7safe. Themostcommonwaylatchkeychildrendealwiththisisbyhiding.Itmightbeinabathroomunderabed8inacloset.ThesecondisTV.They'llwatchitwiththevolumeturneduphigh.Mostparentsdon'trealize9iteffectontheirchildrenandmostparentsareslowtoadmitthefact10theyleavetheirchildrenalone.
下列物质中不需密封保存的是
15分假如你是李华最近刚到美国一所大学求学在学习生活上遇到了问题想向导师Mr.Brown求助.请你写封邮件内容包括 1.问题描述2.请求帮助3.预约时间. 注意1.词数80左右2.可以适当增加细节以使行文连贯.
25分阅读下面短文根据其内容写一篇60词左右的内容概要. FormostofussocialmedialikeTwitterandFacebookisapartofoureverydaylives﹣atworkhomeorboth.Butalotofpeoplearestillfiguringoutwhentouseitandhow.Thisisespeciallytrueinhighschoolwheremanyteachersareunsureofhowitfitsintheclassroom. DanKrutkaahighschoolteacherisanadvocateforusingsocialmediaintheclassroomandisanenthusiasticuserofTwitterhimself.Krutkasaysit'sagreatwaytocommunicatewithhisstudentsduringnonclasshours.YoucancontinuetolearntogetheroutsidetheclassroomsaysKrutka.SowhenstudentsarepostingonTwitter﹣saytheypostsomethinginaccuratelyortheymakeareallygoodpoint﹣Icangoaheadandrespondtothembeforeclass. Krutkasaystweetingwithhisstudentsisn'tjustaboutconvenienceit'salesson.Hesaysstudentsneedtolearnhowtousesocialmediaproperly.Peopleusesocialmediairresponsiblyandschoolshouldbeaplacewherewe'retalkingaboutthatandhowtouseitresponsiblyhesays.AsateacherIthinkpartofmyjobistohelpstudentsunderstandhowtomakebestuseofitasthoughtfullearners. ButKrutkaisamongthefeweducatorswhofeelthisway.ManyschoolsincludingthoseinWesternMassachusettsarestillstrugglingwithwhetherornotTwitterorFacebookshouldbeusedasteachingtools.Manyteachersbelievethatsocialmediaingeneralcaneasilydistractstudents.SeanKavanaghaninthgradeworldhistoryteachertriedusingTwitterinclassbutwasdistractedbyallofthenonclassrelatednoise. Besidesitseemsthatsomestudentsdon'tfeellikethiswayeither.RayLynnisinKavanagh'shistoryclass.I'dratherkeepmyschoolandmypersonalsocialmedialifealittlemoreseparateshesays.I'drathernothavemyteacheronmyTwitterorFacebook.
下列物质中含有氧分子的是
25分2019年元宵节LanternFestival故宫首次开放衣场旅游盛况空前假定你是李华你的朋友Jack参观了元宵故宫灯会lanternshow.现你校文学社LiteratureClub要征集役游故宫灯会经历的稿件请你写一封电子邮件邀请Jack投稿内容包括 1.稿件主题夜游故言灯会经历和感受 2.截止日期2019年3月31日 3.投稿方式邮箱20190678@qq.com 注意1.词数100左右 2.可适当增加细节以使行文连贯. DearJack Yours LiHua
8分Ifyouaskmostpeoplewhatwatertasteslikethey'llprobablytellyouthatwaterhasnotasteandtheymaygiveyouafunnylook.Butifyouwereafruitflyaskinganotherfruitflythatquestionmighthaveadifferentanswer. Toafruitflywaterhasataste.Scientistswanttoknowhowthefruitflyknowswaterbecausethisinformationmayhelpinlearninghowotheranimalsmanagetousewaterintherightway.Waterisveryimportanttolifebuttoomuchortoolittlecanbedeadlytoalivingcreature.Sobyunderstandinghowthefruitflytasteswaterresearchersmaylearnmoreaboutotherlivingthings. AccordingtothenewstudyaproteincalledPPK28makesitpossibleforaflytotastewater.Proteinsbuildcellsandtissuesfightdiseaseandcarrymessagesbetweencells.It'snotsurprisingthataproteinisresponsibleforthefruitfly'sabilitytotastewater. ThePPK28proteinispartofalargerfamilyofsimilarproteins.Oneoftheserelatedproteinsisusedbymammalsincludinghumanstotastesalt.Scientistshavenotfoundaproteinthatenableshumanstotastewater.IntheexperimentCameronandhisteamcomparednormalfruitflieswithfruitflieswhosetastecellshadhadbeendisabled.ThefruitfliesweregivenaspecialchemicalthatwouldglowwhentheflyusedthePPK28protein.Thenthescientistsledthefliestowater.WhenthenormalfliestastedthewaterthePPK28proteinlitup﹣showingthatitwasinuse.Thefruitflyinparticularissointerestingthatsomescientistsarehardatworkcreatingacompletemapofthefruitflybrain.Thismapwillshowallofafly'sneuronsandhelpscientistsunderstandhowtheneuronsworktogether. 1Howdomostpeoplefeelwhenaskedthetasteofwater? A.Disappointed B.Frightened. C.Amused D.Disgusted. 2Whydoscientistswanttounderstandhowthefruitflyknowswater? A.Todecreasethenumberofthefruitfly. B.Toknowmoreaboutothercreatures. C.Tomanagetousewatercorrectly. D.Todescribethetasteofwater. 3WhatdoweknowaboutthePPk28protein? A.Itcanmakehumanstastesalt. B.Itenablesthefruitflytotastewater. C.Thefruitflycan'tlivewithoutit. D.Thefruitflyusesittoavoidillnesses. 4Whatwillthescientistscontinuetoworkat? A.MakingthePPk28protein. B.Tellingmoreinformationaboutcells. C.Creatingmapsofhumanbrains. D.Studyingthefruitfly'sneuronsystems.
7.5分IntheU.S.stateofWashingtonaroadcalled^Interstate90^cutsthroughawildmountainousareatoreachthecityofSeattle.Forthearea'smanykindsofanimalsthebusyhighwaygreatlylimitstheirmovements.Crossing1﹣90﹣astheroadiscalled﹣isariskybutsometimesnecessaryact.Butsoonanimalswillhaveasaferchoiceforcrossingtheroad.Theywillbeabletogoaboveit. Tohelptheanimalsthestateisfinishingworkonitslargest﹣everwildlifebridge.The11﹣meter﹣tall20﹣meter﹣widestructurebeginsintheforest.Itformstwoarchesabovethehighwayoneforeachdirectionoftraffic.Workersareaddingfencingandplantstohelpguidetheanimalsacrossthebridge.Two﹣meter﹣thickwallswillhelpblocknoisefromvehiclesbelow. The1﹣90BridgeispartofagrowingnumberofwildlifecrossingsacrosstheUnitedStates.Somearefencessomeareoverlandbridgesandsomeareunderpasses.Theyallaimtokeepdriversandanimalsawayfromeachother.Collisionsbetweenanimalsanddriversarerarelydeadlytopeople.Buttheyareoftendeadlytowildlife.InCanada'sBanffNationalParkstudieshavefoundthatwildlifecrossingsreducethearea'sanimal﹣drivercollisionsby80percent. Mostofthewildlifebridgesareinwesternstates.Butexpertshavenotedmanyotherareasthathaveaneedforsuchpaths.JenWatkinswhoseorganizationhashelpedcampaignforanimalcrossingssaysftindformorecrossingsisthenumber﹣onebarrier. PattyGarvey﹣DardaoftheU.S.ForestServicehasworkedonthe1﹣90crossingfromthestartoftheproject.Shesaysthe﹩6﹣millionbridgewillonedaypayforitselfbecausethehighwaywillnothavetobefullyorpartlyclosedeachtimealargeanimalisstruck.ShesaidIfyoushutdownInterstate90youshutdowninterstatecommerce. 1WhatisthepurposeofbuildingthebridgeoverInterstate90? A.Toreducehumandeathsincrashwithwildlife. B.Topreventwildlifefrombeingstruckbyvehicles. C.Toarousepublicawarenessofwildlifeprotection. D.Toprovideasaferchoicetocrosstheriskyroad﹣ 2AccordingtoJenWatkinswhatisthebiggestchallengeincrossingconstruction? A.Findingwaystohelpguideanimalsacrossthebridge. B.Collectingmoneytobuildmorewildlifecrossings. C.Locatingareastoconstructappropriatecrossings. D.Encouragedriverstoobeytheregulationsoftraffic. 3WhatdotheunderlinedwordsinParagraph5imply? A.Thebridgewillprovetobewellworththehighprice. B.Expenseforbuildingsuchbridgeswillbereduced. C.Thebridgewillgreatlypromotetradeandcommerce. D.Livessavedthroughthebridgearedefinitelybeyondprice.
30分Cruz11andAnthony10couldn'tagreewerethebirdsoutontheiceducksorgeese?Therewasonlyonewaytofindout.Soona1Januaryeveninglastyearthetwofriends2ontothefrozenpondneartheirhomesinFrankfortIllinoistogeta3look.Firsttheythrewarockontotheiceto4itthentheysteppedonit.5theicewouldholdtheirweightAnthonytookafewstepsthen…FOOMP.Hecrashed6theseeminglyfrozensurface.TherewasnosoundnocrackhesaidIjustfellthrough7. Cruzrushedtohelphis8friend.FOOMP﹣thepond9himtoo.Theboyswereuptotheirnecksinicywaterandquicklylosing10intheirlimbs.Anychanceoftheirfreeingthemselveswas11.Cruzwassurehewasgoingtodie.Anthony'ssisterhadseenitandstartedscreamingforhelp. JohnLavinaneighbor12nearbyheardherandquicklypulledover.Seeingtheboyshegrabbedanearbybuoy救生圈withonehandkickedoffhis13andranintotheicywaterhittinghiswaythroughtheicewithhisfree14.EventuallyLavin15hiswaytoCruzandAnthonyandpulledthembacktoland.Theyweretakentothe16wheredoctorsdiscoveredthattheirfive﹣minutestayinthewaterhad17theirbodytemperaturenearlytendegrees. 18theboyshavefullyrecoveredthankstotheir19neighbor.JusttothinksaysCruz20hewasn'tthereIcouldhavedied. 1A.warm B.chilly C.rainy D.windy 2A.toured B.rushed C.ventured D.wandered 3A.casual B.actual C.better D.deeper 4A.test B.break C.hit D.see 5A.Bothered B.Persuaded C.Concerned D.Convinced 6A.through B.onto C.in D.across 7A.slowly B.apparently C.instantly D.gradually 8A.discouraged B.panicked C.frustrated D.confused 9A.drowned B.drew C.embraced D.swallowed 10A.balance B.feeling C.faith D.heart 11A.givingaway B.slippingaway C.slippingout D.givingout 12A.driving B.passing C.coming D.walking 13A.bags B.gloves C.shoes D.clothes 14A.fist B.leg C.arm D.finger 15A.felt B.broke C.swam D.made 16A.shelter B.home C.school D.hospital 17A.lowered B.raised C.lessened D.changed 18A.Unexpectedly B.Fortunately C.Naturally D.Immediately 19A.strong B.considerate C.fearless D.friendly 20A.unless B.until C.when D.if
7.5分The13thofJune1325IleftTangiermybirthplacewiththeintentionofmakingthepilgrimagetoMecca去麦加朝圣…toleaveallmyfriendstoabandonmyhomeasbirdsabandontheirnests.SobeginsanoldmanuscriptinalibraryinParis﹣thetraveldiaryofIbnBattuta. AlmosttwocenturiesbeforeColumbusthisyoungMoroccansetoffforMeccareturninghomethreedecadeslaterasoneofhistory'sgreattravelers.DrivenbycuriosityhejourneyedtoremotecornersoftheIslamicworldtravelingthrough44moderncountriesthreetimesasfarasMarcoPolo.LittlecelebratedintheWesthisnameiswellknownamongArabs.InhishometownofTangierasquareahotelacafeaferryboatandevenahamburgerarenamedafterhim. IbnBattutastayedinMeccaasastudentforseveralyearsbuttheurgetotravelsoontookover.InoneadventurehetraveledtoIndiaseekingprofitableemploymentwiththesultan﹣theMuslimrulerofDelhi.Onthewayhedescribedhisgroupbeingattackedintheopencountryby80menonfootandtwohorsemen…IwashitbyanarrowandmyhorsebyanotherbutGodinhisgracepreservedme…InDelhithesultangavehimthepositionofjudgebasedonhispreviousstudyatMecca.ButthesultanhadanunpredictablecharacterandIbnBattutalookedforanopportunitytoleave.WhenthesultanofferedtofinanceatriptoChinaheagreed.IbnBattutasetoffinthreeshipsbutmisfortunestruckwhilehewasstillontheshore.Asuddenstormgroundedandbrokeuptwoshipsscattering散播treasureanddrowningmanypeopleandhorses.Ashewatchedthethirdshipwithallhisbelongingsandslaves﹣onecarryinghischild﹣wascarriedouttoseaandneverheardfromagain. AfteralifetimeofamazingadventuresIbnBattutawasfinallyorderedbytheSultanofMoroccotoreturnhometosharehiswisdomwiththeworld.Fortunatelyheagreedandwroteabookthathasbeentranslatedintonumerouslanguagesallowingpeopleeverywheretoreadabouthisunparalleledjourneys. 1WhatcanwelearnaboutIbnBattutafromthepassage? A.HehadgreatinterestintheIslamicworld. B.Hereturnedtohishomelandtowriteabook. C.HisjourneyswerelessimportantthanMarcoPolo's. D.Hisjourneyswereverycommonforpeopleofthattime. 2TheSultanofDelhigaveIbnBattutaapositionofjudgebecause. A.IbnBattutahadstudiedinMecca B.IbnBattutahadbeenajudgebefore C.IbnBattutahadbeenpopularwithArabs D.IbnBattutahadtraveledtomanycountries 3Whichisthebesttitleforthepassage? A.TheLearnedIbnBattuta B.AVisitortoMecca C.TheTravelsofIbnBattuta D.DesireforAdventures
物质W是一种含氮有机物会污染土壤.W在培养基中达到一定量时培养基表现为不透明.某研究小组欲从土壤中筛选出能降解W的细菌目标菌.回答下列问题. 1要从土壤中分离目标菌所用选择培养基中的氮源应该是. 2在从土壤中分离目标菌的过程中发现培养基上甲乙两种细菌都能生长并形成菌落如图所示.如果要得到目标菌应该选择菌落进一步纯化.选择的依据是. 3土壤中的某些微生物可以利用空气中的氮气作为氮源若要设计实验进一步确定甲乙菌能否利用空气中的氮气作为氮源请简要写出实验思路预期结果和结论即. 4该小组将人工合成的一段DNA转入大肠杆菌使大肠杆菌产生能降解W的酶酶E.为了比较酶E与天然酶降解W能力的差异该小组拟进行如下实验请完善相关内容. ①在含有一定浓度W的固体培养基上A处滴加含有酶E的缓冲液B处滴加含有相同浓度天然酶的缓冲液C处滴加三处滴加量相同. ②一段时间后测量透明圈的直径.若C处没有出现透明圈说明若AB处形成的透明圈直径大小相近说明.
干冰常用于人工降雨利用了干冰的性质.
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