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精编WORD文档下载可编缉打印下载文档，远离加班熬夜2021年陕西专升本院校篇一：2021年陕西统招专升本英语真题2021年陕西省普通高等教育专升本招生考试试题大学英语Ⅰ.VocabularyandStructure(40points)Directions:Inthispart,thereare40incompletesentences.Foreachsentencethereare4choicemarkedA，B，C，D.YoushoulddecideonthebestchoiceandmarkthecorrespondingletterontheAnswerSheet.A.bareB.emptyC.blankD.vacantA.sourceB.resourceC.birthD.origincontext.A.approachB.solutionC.mannerD.road4.A.ThatB.WithC.ItD.Whatbooks.A.helpB.helpingC.helpsD.tohelplargeincreaseinfoodprice.A.strengthB.supportC.agreementD.voteA.remindsmeofB.remindsmetoC.remembersmeofD.remembermetoA.twiceasmanyasB.astwicemanyas精编WORD文档下载可编缉打印下载文档，远离加班熬夜C.astwicemuchasD.twiceasmuchaslanguage.A.accumulateB.collectC.assembleD.gatheroflife:drivingeverywhere.A.enviousB.hopefulC.pleasedD.happy11.OneoftherequirementsforafireisthatthematerialA.isheatedB.willbeheatedC.beheatedD.wouldbeheatedA.transferB.adjustC.directD.addA.canwriteB.couldhavewrittenC.couldwriteD.havewritten14.Withthedevelopmentofindustry,thisregionwillsurely.A.developB.profitC.succeedD.thriveIhaverelatives.A.whichB.neverthelessC.whereD.when16.-CouldIborrowyourdictionary?-I’dgetitforyouIcouldrememberwholastborrowedit.A.exceptthatB.ifonlyC.onlyifD.unless17.Theterroriststoblowuptheplaneiftheirdemandswerenotmet.A.pretendedB.determinedC.threatenedD.proceeded18.Itisgenerallythoughttobeofimportancetoamanthathehimself.精编WORD文档下载可编缉打印下载文档，远离加班熬夜A.knewB.knowC.knowsD.mustknow19.Myfriendsusintogoingswimming.A.persuadedB.toldC.invitedD.suggested20.Thetotalcultivatedareais13,000acres,10,000acresareirrigatedfields.A.whichB.ofwhichC.inthatD.ofthat21.Therewasalargecrowdinthesquareagainstthewar.A.protectingB.protestingC.preventingD.promoting22.Icouldnotpersuadehimtoacceptit,makehimseetheimportanceofit.A.ifonlyIcouldnotB.nomorethanIcouldC.orIcouldnotC.norcouldI23.Mr.Greensaidhisclientsoursamplesbytheendoflastmonth.A.didn’treceiveB.hadn’treceivedC.haven’treceivedD.don’treceive24.Languagebelongstoeachifus,totheflower-sellertotheprofessor.A.asfarasB.asmuchasC.asmanyasD.aslongas25.Becauseofthereductionofairpollution,thiscitynowisagoodplace.A.wheretoliveB.whichtoliveC.toliveD.tobelive26.Onlywhenitiscorrectineverydetail.精编WORD文档下载可编缉打印下载文档，远离加班熬夜A.hismodelcanreallyrunB.canhismodelreallyrunC.hismodelreallycanrunD.canreallyhismodelrun27.Heistowin.Nooneelseintheracestandsachance.A.boundB.liableC.probableD.apt28.IcontinuedtostudythediscouragementIhandreceived.A.despiteofB.despiteC.inspiteD.inspitethat29.It’stheinthiscountrytogooutandpickflowersonthefirstdayofspring.A.normalB.habitC.customD.use30.Withoutthefrictionbetweentheirfeetandtheground,peoplewouldbeabletowalk.A.innotimeB.onanyaccountC.byallmeansD.innoway31.Hedidn’tallowinhisroom;actuallyhedidnotallowhisfamilyatall.A.tosmoke;tosmokeB.smoking;tosmokeC.tosmoke;smokingD.smoking;smoking32.Withsuchpoorhereallyneedsglasses.A.visionB.viewC.senseD.scene33.theplancarefully,herejectedit.A.TohaveconsideredB.ToconsiderC.HavingconsideredD.Considering34.Findingitdifficulttototheclimateinthecity,hedecidedtomove精编WORD文档下载可编缉打印下载文档，远离加班熬夜tothenorth.A.fitB.adoptC.suitD.adapt35.Ourpublictransportationsystemisnotfortheneedsofthepeople.Weneedmorebusesandsubways.A.completeB.adequateC.normalD.good36.Heapologizedhavingtoleavesoearly.篇二：2021陕西专升本考点-连续知识扩展第三节连续题型一：讨论分段函数在分段点的连续性解题提示（一）两种情形：1.已知分段函数，研究其在分段点的连续性；2.已知分段函数在分段点连续，反求函数关系式中的参数．（二）方法在分段点x0处连续?f(x0?0)?f(x0?0)?f(x0)．?cosx,x?0?例1设f(x)??sinx，试问f(x)在x?0处是否连续？,x?0??xf(x)?lim?cosx?1解由于f(0?0)?lim?x?0x?0f(x)?lim?f(0?0)?lim?x?0x?0sinx?1xf(0)?1即有f(0?0)?f(0?0)?f(0),f(x)在点x?0连续．?1?xsinx?a,x?0精编WORD文档下载可编缉打印下载文档，远离加班熬夜?例2已知f(x)??b,x?0(a,b为常数)，问a,b为何值时，f(x)在x?0处连续．?1?xsin,x?0x?1x?0x?0x1f(x)?limx?sin?0f(0?0)?limx?0?x?0?xf(x)?lim?(sinx?a)?1?a解由于f(0?0)?lim?若要f(x)在x?0处连续，必有f(0?0)?f(0?0)?f(0)即1?a?0?b解得a??1,b?0．题型二：确定函数的间断点并进行分类解题提示函数y?f(x)的间断点，是指满足下列三个条件之一的点：1°f(x)在点x0处无定义；2°在x0点limf(x)不存在；x?x03°在x0点limf(x)存在，但limf(x)?f(x0)．x?x0x?x0求函数y?f(x)的间断点也就是寻找满足三个条件之一的点．x2?1例求函数f(x)?2的间断点，并确定其类型．x?x?2解所给函数在点x??1,2没有意义，因此x??1,2是所给函数的间断点．由于在x??1点有精编WORD文档下载可编缉打印下载文档，远离加班熬夜f(?1?0)?lim?f(x)?lim?x??1x??1(x?1)(x?1)x?12?lim??x??1(x?1)(x?2)x?23f(?1?0)?lim?f(x)?lim?x??1x?1x?12?x?23f(?1?0)?f(?1?0)，故x??1是第一类间断点且为可去间断点．在x?2点有x2?1f(2?0)?limf(x)?lim??x?2?x?2?(x?1)(x?2)x2?1f(2?0)?limf(x)?lim??x?2?x?2?(x?1)(x?2)故x?2是第二类间断点且为无穷间断点．题型三：有关闭区间上连续函数的命题的证明解题提示其基本步骤是：把已知方程右端项全部移到左端，令其为f(x)，再由题设确定区间?a,b?，然后验证f(a)?f(b)?0即可推证在a与b之间至少存在一个根．例设f(x)在?a,b?上连续，且f(a)?a，f(b)?b，证明f(x)?x在?a,b?内至少有一实根证令F(x)?f(x)?x，则F(x)在?a,b?上连续，F(a)?f(a)?a?0，F(b)?f(b)?b?0，则F(a)?F(b)?0由零点定理知，在(a,b)内至少存在一点?，使F(?)?0，即f(?)??也就是说方程f(x)?x在区间(a,b)内至少有一个根．篇三：2021陕西统招专升本考点-函数的概念精编WORD文档下载可编缉打印下载文档，远离加班熬夜第一节函数一、概念（一）定义（二）常见形式1.由一个解析式表示2.分段函数在定义域内的不同点集内由不同（段）的数学表达式表示的函数称为分段函数．3.隐函数如果函数的对应法则是由方程F(x,y)?0给出，则称y为x的隐函数．4.参数方程表示的函数如果x与y的关系通过第三个变量联系起来，如??x??(t)?y??(t)5.复合函数y是u的函数：y?f(u)，而u又是x的函数：u??(x)6.反函数对数函数y?logax与指数函数y?ax互为反函数，其定义域和值域互相对应，一个函数的定义域恰好是另一个函数的值域（三）初等函数（图像，定义域，值域）（四）性质（单调性、奇偶性、周期性、有界性）二、考试题型题型一：求函数定义域精编WORD文档下载可编缉打印下载文档，远离加班熬夜（1）y?x?2?12x?12?ln(5?x)；（2）y??x?arcsin．x?37解（1）要使y有意义，x应满足x?2?0,x?3?0,5?x?0，即x?2,x