陕西省三原县2024年初中学业水平考试模拟试题（一）数学.考卷答案试卷答案,我们目前收集并整理关于陕西省三原县2024年初中学业水平考试模拟试题（一）数学.考卷答案得系列试题及其答案，更多试题答案请关注本网站↓↓↓
陕西省三原县2024年初中学业水平考试模拟试题（一）数学.考卷答案试卷答案
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EisaisaidtheywoulddiscussthefullresultsfromthestudyinlateNovember.Theyalsoplantopublishfindingsinamedicalpublication.AndthecompanysaiditwasseekingquickapprovalforthedrugintheUnitedStates,JapanandEuropebyearlynextyear.TheracetoslowtheprogressionofAlzheimer'scomesasthenumberofAmericanslivingwiththediseaseisexpectedtodoubleto13millionby2050,theAlzheimer'sAssociationsaid.28.Whatisparagraph1mainlyabout?A.WhatWHOdoes.B.WhatAlzheimer'sis.C.Howdementiaistreated.D.Whataffectshuman'sbrain.29.WhichisthebestintreatingAlzheimer's?A.Aduhelm.B.Placebo.C.Lecanemab.D.Beta-amyloidprotein.30.Whatcanbeinferredaboutlecanemabfromthetext?A.Itrarelyshowseffects.B.Itisstillindevelopment.C.Ithasbeenofficiallyputintouse.D.ItcuredsomepatientsoftheAlzheimer's.31.WhatdoestheAlzheimer'sAssociationimply?A.Alzheimer'swilldisappearin30years.B.SlowerprogressismadeinstudyingAlzheimer's.C.ThereisanurgentneedtofindcureforAlzheimer's.D.Alzheimer'swillbringmoreseverepainstopatients.DKenyaishometonearly400speciesofmammals.Officialssayitisgettingmoredifficulttoprotectthem,asclimatechangeandhumanactivitiesdamagetheirnaturalenvironments.Thefreemobilephoneapp,MammalAtlasKenya,orMakenya,letsanyuserwhoseesawildmammalidentifyitandgiveitslocation.Userscanalsogiveotherdetails."Youcanalsoaddthebehavior,"saidDr.SimonMusila,aresearcherattheNationalMuseumsofKenya.Musilasaidthereisaneedtohavemanypeopleusetheapptogetmoreinformationabouttheanimals.ThiscanhelpthesmallnumberofmammalspecialistsinKenya.Thespecialistshavekeptrecordsoftheanimals'changingenvironmentsandsurvivalconditions.Manypeople,includingsafariguides,visitors,students,oranyonewhogoesoutandseestheanimals,couldusetheapp,Musilasaid.Theycanuploadimagesandadddetails,suchasthenumberofmammalsandtheirexactlocations.SamsonOnyuokusestheMakenyaapptohelpprotectanimalsinhiscountry."IthinkasaKenyan,thatismylittlewayofcontributingtotheconservationinitiatives,Onyuoksaid.Userslikehimhavereportedmorethan2,500mammalsightingssinceAugust.ExpertssaythatwhileAfricaisnotthecauseofmuchclimatechange,itisbadlyaffectedbyit.Dr.PhilipMuruthi,vicepresidentoftheAfricanWildlifeFoundation,saidthatthebirthrateofraremammalsandthesurvivalrateofyoungonesaredropping."Itisveryhardtobenefitormanagewhatyoudon'tknow,hesaid."Thatiswhythisappissoimportant.Itisgoingtotelluswhichspecieswehave,wheretheyare,andmaybewhichonesarehighlyendangered,whatweneedtodoaboutthem.Andespeciallynotjustthebigthingsbutalsothesmallthings,likethebats.WildlifeofficialssayKenyaishometoatleastathirdofthemammalspeciesinAfricaandarehopefulappuserswillhelpprotectthem.32.WhatcanbeknownaboutMakenya?A.Ithelpskeeptrackofwildanimals.B.ItrequiresprofessionaltrainingtouseC.ItisonlyavailabletomammalspecialistsD.Itisaffordablewithallentertainmentfunctions.英语第5页（共8页）
分析我们根据“以较大的数减较小的数，接着把所得的差与较小的数比较，并以大数减小数．继续这个操作，直到所得的减数和差相等为止．”的原则，易求出利用更相减损之术求1230与411的最大公约数时，第三次做差所得差值．
解答解：利用更相减损之术求1230与411的最大公约数步骤如下：
1230-411=819，
819-411=408，
411-408=3，
…
即第三次做差所得差值为3，
故答案为：3
点评本题考查的知识点是最大公因数和更相减损术，更相减损术的方法和步骤是：以较大的数减较小的数，接着把所得的差与较小的数比较，并以大数减小数．继续这个操作，直到所得的减数和差相等为止．
