保山市2023~2024学年普通高中高三上学期B、C 类学校第三次质量监测数学.考卷答案试卷答案,我们目前收集并整理关于保山市2023~2024学年普通高中高三上学期B、C 类学校第三次质量监测数学.考卷答案得系列试题及其答案，更多试题答案请关注微信公众号：考不凡/直接访问www.kaobufan.com(考不凡)
保山市2023~2024学年普通高中高三上学期B、C 类学校第三次质量监测数学.考卷答案试卷答案
以下是该试卷的部分内容或者是答案亦或者啥也没有，更多试题答案请关注微信公众号：考不凡/直接访问www.kaobufan.com(考不凡)
fartherbackintime.Theearlyhumansshapedbonesintosharpblades,whichwereusedtotakeapartanimals'remains,accordingtoRowe.Therearealsosignsthattheycookedtheanimalbonesoverafiretomeltoffthefat."Therealevidencethatwehavehastodowiththebreakagepatterns,andhowthoroughtheyare.Theymusthaveusedrocksorhammerstonestobusttheskeletonapart...Thesepeoplewouldusewhatevertheycould,RowetoldUSAToday.32.WhatcanbelearntabouttheearliesthumansinNorthAmerica?A.Theyarrivedthere16,000yearsago.B.Theycausedmammothtodisappear.C.TheybelongedtotheClovisculture.9y1小1i【.D.Theycouldmaketoolswithbones.i5)133.Whyarethefindingssimilartothenewoneignored?A.Theylack.agoodchance..B.Theyfailtodrawattention.C.Theydisagreewithearlierresearch.D.Theyaren'tstudiedscientifically.34.HowdoesRowefindthenewdiscovery?.20ei'7,A.Annoying.B.Inspiring.C.Puzzling..D.Embarrassing.35.Whatcanbeasuitabletitleforthetext?oy1sif人3f29i3WA:EvidenceofEarlierHumans':ArrivalinNorthAmericaB.TheEarliestHumans'SettlinginNorthAmericaC.TheEarliestToolMakersinNorthAmericaD.ResearchonMammothsinNorthAmerica)第二节（共5小题；每小题2分，满分10分）根据短文内容，从短文后的选项中选出能填人空白处的最佳选项
选项中有两项为多余选项
i6f,)ri2n0b5Travelinginthesamecar.withseveralpeopleisanexcellentidea,whichallowsonetosaveonfuel.Inthepast,fewofuswouldgotothecompanyorworkplacetogether.36Weshareacareverydaywithpeoplewhomwedonotknowanythingabout.WejustneedtoconnecttotheInternetoruseamobileapptofindtheperfecttransportforus.37Itmakespracticalsensetousetoolsatourhandstoconnectwithpeoplewhowouldliketosharecarstogether.Toolslikemobileappshelpcontributetosharingoptions.Undoubtedly,carpooling()isanexcellentoptiontosavesomemoney.Italsoad-justsourmonthlybudgetforotheractivities,butthetruthisthatthistypeoftransportisalsomuchbettersuitedtoimprovethetrafficconditionsofcities.38Practicallyspeakingmanytimes,weseeheavytrafficbutuponfurtherfindingwewouldseemanycarswithonlyonepassengerinit.Ratherthanbeingaloneinaheavytrafficsitua-tion,whynothavepassengers?39Atthesametime,youcanalsohaveamazingconver-sations.Spendingontransportationispartofwhatweconsidertobefixedexpensesinafamily,份,205【高三英语第7页（共10页）】2005C·QG·
分析利用角的等价变换，结合三角函数的公式分别化简求值．
解答解：原式=$\frac{cos（80°-15°）-sin80°sin15°}{cos（80°-75°）-sin80°sin75°}$=$\frac{cos80°cos15°}{cos80°cos75°}$=$\frac{sin75°}{cos75°}$=tan75°=tan（30°+45°）=$\frac{\frac{\sqrt{3}}{3}+1}{1-\frac{\sqrt{3}}{3}}$=2+$\sqrt{3}$；
故答案为：2+$\sqrt{3}$．
点评本题考查了三角函数式的化简求值；等积式发现角度之间的关系，进行等价变形，利用三角函数公式化简．
