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2023-2024学年度下学期高三自我提升二[HZ]数学试卷答案

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C.Exerciseplusahealthydiet.D.SixmonthsofexercisewithoutdrugsBPetadoptionistheperfectwaytoaddanewfamilymember.Butifapetistooyoungtobeadopted,itmustbefostered(first.That'showapuppynamedMaggiethatwasrescuedbytheNorthShoreAnimalLeagueAmerica(NSALA),endedupbeingfosteredbyasweetsix-year-oldboy.TheanimalrescueorganizationinPortWashingtonneededtofindafosterhomeforMaggiebecausesheneededtobetrainedwithbasicobedience(skillsandtobecomecomfortablewithahomeenvironment.NSALAsentoutacallforafosterfamily.RomanDuncan'sfamilywastheluckyonechosenforthejob.Theboyfellinlovewiththepuppyandwasabletobepartofhergrowthduringthoseformativemonths.ThefamilyalwaysmadeitcleartoRomanthatMaggiewouldeventuallybeadoptedandmovetoadifferenthome.WhenitcametotimeforMaggietobeadopted,Romancouldn'tholdhistears.Hedecidedtowriteletterstothepuppy'sfuturefamily.Hewrotelettersabouthisfurryfriend,saying"Maggieissocuteandlovestoplayfetch.Sheisthebestdogever,"andslippedthenotesandsomephotosintoMaggie'spaperwork.TherescueteamweresurprisedandthenincrediblytouchedbythenotestheyfoundwhenopcningMaggic'sfile.NSALAmadesurcthatRoman'snotesrcachedheradoptedfamily.Theboy'sgestureisexactlywhatpetfosteringisabout.Adogorcatthathasgonethroughterriblesufferingssuchasbeingabusedneedstolearnwhatitmeanstoliveinahome.Fosteringhelpsreducetheanimal'sstressandmakesittrustpeopleagain.Itisalsoanopportunityforpeoplewholovepetsbutcan'thavethemfull-timeduetosomerestrictions.Petfosterscangettoenjoyhelpingapetinneed.Ifyouareinterestedinpetfostering,contactalocalshelteroranimalrescuenearyou.24.WhathappenedtoMaggieatfirst?A.ShewasfosteredbyRoman'sfamily.B.Shewassettledinanewhome.C.Shewassavedbyarescueteam.D.Shewasreleasedintothewild.25.WhydidRomanwritenotesaboutMaggie?A.TochooseMaggie'sfuturefamily.B.TopreserveMaggie'spaperwork.C.Tocxpresshismixedfeclings.D.TohelpMaggicscckanewhome.26.Whatismainlydiscussedinthelastparagraph?A.Thebenefitsofpetfostering.B.Therestrictionstoadoptingapet.C.Ahomelessanimal'sbarriers.D.Theaccesstofosteringapet.27.Whatisthebesttitleofthetext?A.RomanDuncan'sFamilyAdoptsaNewFamilyMemberB.PetfosteringPlaysGreatRolesinRescuingLostAnimals第4页共10页

分析根据函数f（x）=$\frac{x+b}{（2x+1）（x-a）}$为奇函数，取两组特殊值，求出a，b的值，可得答案．

解答解：∵函数f（x）=$\frac{x+b}{（2x+1）（x-a）}$为奇函数，
∴f（0）=$\frac{b}{-a}$=0，即b=0，
f（-1）=-f（1），即$\frac{-1}{a+1}$=-$\frac{1}{3（1-a）}$，
解得：a=$\frac{1}{2}$，
经检验当a=$\frac{1}{2}$，b=0时f（x）=$\frac{x}{（2x+1）（x-\frac{1}{2}）}$满足f（-x）=-f（x），
故a+b=$\frac{1}{2}$，
故选：A

点评本题考查的知识点是函数奇偶性的性质，方程思想，特殊值思想，难度中档．

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