贵州省贵阳市南明区2023-2023学年度第一学期九年级期中质量监测数学试卷答案,我们目前收集并整理关于贵州省贵阳市南明区2023-2023学年度第一学期九年级期中质量监测数学得系列试题及其答案，更多试题答案请关注我们

贵州省贵阳市南明区2023-2023学年度第一学期九年级期中质量监测数学试卷答案

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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

AdognamedTinsleycaughttheattentionofNewHampshireStatePolicewhentheyrespondedtoacallaboutalooscdogrunningdownahighway.TomSandbergandDaniclBaldassarrearrivedatthesceneand21alargedoglookingscared.Theyweretryingtogetthedogoffthehighwaytokeepit22.However,assoonastheygot23tothedog,itwouldrunandthen24andlookatthem,tryingtogettheir25.Finally,thedog26atthetopoftheembankmentandlookeddown.Theofficers27adamagedsectionofguardrailandwhentheylookeddownsawabadlydamagedpickuptruckthathad28.Twomeninsidethetruckhadbeen29fromthevehicleandwereinjuredandhypothermic(体温过低的).Theofficerscalledformedical30andwhileatthescene,theylearnedTinsley31oneoftheinjuredmen."It'sreallyquite32.Thisdogdefinitely33theirlives.Idon'tthinktheywouldhave34thenightgiventhetemperaturcs,Baldassarresaid.Asemergencyrescueworkersbegantheirmedicalcareofthe35,thedogsatthereniceandcalmrightnexttoitsowner.Bothmenwerethentakentoanareahospitalfor36.Tinsley'sowner,CamLaundry,saidhewas37Tinsleycametohisrescueafterthe38.Laundrywasnotscriously39,andsaidTinslcywouldhehighlyrewardedfor40suchintelligenceanddevotion.21.A.raisedB.adoptedC.locatedD.purchased22.A.cleanB.safeC.activeD.quiet23.A.closeB.sensitiveC.availableD.used24.A.followB.startC.appearD.stop25.A.permissionB.informationC.attentionD.chance26.A.livedB.stoodC.ateD.slept27.A.mentionedB.abandonedC.noticedD.repaired28.A.rolledoverB.passcdbyC.setoffD.joincdin29.A.selectedB.bannedC.hiddenD.thrown30.A.insuranceB.assistanceC.educationD.progress31.A.appealedtoB.referredtoC.turnedtoD.belongedto32.A.possibleB.remarkableC.practicalD.boring33.A.savedB.costC.guidedD.risked34.A.ruincdB.forgottenC.survivedD.predicted35.A.injuredB.unemployedC.disadvantagedD.agcd36.A.adviceB.experimentC.protectionD.treatment37.A.gratefulB.fearfulC.angryD.sorry38.A.introductionB.operationC.floodD.crash39.A.confusedB.hurtC.movedD.cxamined40.A.gainingB.demandingC.showingD.applying第二节语法填空（共10小题，每小题1.5分，满分15分）阅读下面材料，在答题卡相应位置处填入适当的内容(1个单词)或括号内单词的正确形式

Agroupofcomputerengineers,allof41werehighlyestablishedintheir

分析判断出函数的奇偶性，可判断①，求出函数的值域，可判断②；判断出函数的极值点，可判断③；利用函数的单调性，比较两个函数值，可判断④．

解答解：①∵函数$f（x）=\frac{sinx}{x}$，
∴$f（-x）=\frac{sin（-x）}{-x}$=$\frac{-sinx}{-x}$=$\frac{sinx}{x}$=f（x），
故f（x）是偶函数，故①错误；
②∵根据三角函数线的定义知|sinx|≤|x|，
∴$\frac{\left|sinx\right|}{\left|x\right|}$≤1，
∵x≠0，
∴$\frac{sinx}{x}$＜1成立，故②正确；
③∵f′（x）=$\frac{xcosx-sinx}{{x}^{2}}$，
∵f′（$\frac{3π}{2}$）=$\frac{4}{9{π}^{2}}$≠0，
∴x=$\frac{3π}{2}$ 不是极值点，
∴③错误；
④∵$\frac{π}{2}$＜2＜3＜π，
∴sin2＞sin3＞0，
∴$\frac{sin2}{2}$＞$\frac{sin3}{3}$，∴④正确，
故答案为：②④．

点评本题以命题的真假判断为载体考查了三角函数的奇偶性，值域，极值，单调性是三角函数图象和性质的综合应用，难度较大．