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安徽省2023-2024学年度七年级第二学期阶段练习（期中）数学试卷答案

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chains.Theskillsthewomenlearnintheprogramarejustasimportantasthefundstheyearnfromthesaleoftheirhandicrafts."Whenwesellproducts,theprofitfromthatgoesbacktothewomen,"Hewittexplained."Wearenowemploying42womenbytheendofthisweek.Itmakesagreatdifferencetoeverysinglewoman,totheirfamilyandtoeveryonelivinginthiscamp.Iamveryproudofthat."AprogramparticipantnamedLauresharedherstoryonthevideo,"IcansayinthebeginningwhenIenteredGreece,Iwaslike,whatcanIdowithmylife?"Laurestruggledtostayoptimistic."ButwhenIheardaboutLoveWelcomesandstartedlooming,allofthesethoughtssuddenlymelted,"shesaid.LearningtheskillhelpedLauremaintainapositiveattitude.Astheinitiativehasgrowninpopularity,ithasattractedattentionfromwell-knownartists.1.Whatisthebesttitleforthetext?A.LoveWelcomes-HometoGreatWomenB.ThreeGreatDisplacedWomenWhoMakeaDifferenceC.HowtoSetUpaFamousOrganizationwithLittleMoneyD.TheInitiativeHelpsDisplacedWomenWeaveaBrighterFuture2.Whatbenefitsfemalesofthecampmost?A.Keychains.B.Thejoyoflabor.C.Theskillstheylearn.D.Recycledmaterial.3.WhatdoesHewittthinkofLoveWelcomes?A.Far-sighted.B.Significant.C.Concerned.D.Annoying.4.Whatmightbeinvolvedinthenextparagraph?A.SomeexamplesoffamousartistsB.Hardworkofloominglocally.C.ThebenefitsLaurehasgained.D.Thebestsellingofhandicrafts.【语篇导读】本文是一篇记叙文

文章讲述了LoveWelcomes帮助流离失所的妇女们学习编织技术的故事

l.D标题归纳题

通读全文可知，LoveWelcomes帮助流离失所的妇女们通过学习编织技术等，从而有了更加明朗的未来

D项适合作为文章标题

2.C细节理解题

根据第三段中的Theskillsthewomenlearnintheprogramarejustasimportantasthefundstheyearnfromthesaleoftheirhandicrafts.可知答案

3.B细节理解题

根据第四段中的Itmakesagreatdifferencetoeverysinglewoman,totheirfamilyandtoeveryonelivinginthiscamp..可知，Hewitt认为LoveWelcomes很有意义

4.A推理判断题

根据最后一段中的Astheinitiativehasgrowninpopularity,ithasattractedattentionfromwel-knownartists.可判断，接下来应该谈论与著名艺术家有关的例子

BIfSirihadanyfeelings,shewouldknowshewasbeingteased.When10-year-oldBelindaandherfriendsplay,theysometimesaskSiriquestionsinthehopeshewillsaysomethingrandomandmakethemlaugh."Doarap,"theyurgeSiri.“Tellusabedtimestory..”Belindaandherfriendshavegrownupinteractingwithartificialintelligence(AI)intheformofSiri,AlexaandGoogle.Theywerebornintoaworldofportabledevices.In2010whenthefirstoftheirgenerationwereborn,ApplereleasedthefirstiPad,InternetactivistJulianAssangepublishedthousandsofclassifieddocuments,MarkZuckerbergwasTime'sPersonoftheYear.MarkMcCrindle,Sydney-basedsocialresearcher,firstcoinedthetermGenerationAlphatodescribethosebornbetweenabout2010and2024inhisbookGenerationAlpha.Hesaidthisgenerationhasaccesstomoretechnology,informationandexternalinfluencesthananygenerationbeforethem,andatayoungerage.BelindahashadaniPadsinceyear3andisallowedtouseheriPadafterdoingviolinandpianopractice."It'salways'CanIusemyiPad,I'lldothatafterwardsandtheafterwardsneverhappens,'"Catherinesays."Changetheorderanditgetsdone."·48·

分析由三角函数的最值可得ab的方程组，解方程组代入函数解析式，由三角函数的最值可得．

解答解：∵函数y=a-bcosx（b＞0）的最大值为$\frac{3}{2}$，最小值为-$\frac{1}{2}$，
∴$\left\{\begin{array}{l}{a-b=-\frac{1}{2}}\\{a+b=\frac{3}{2}}\end{array}\right.$，解得$\left\{\begin{array}{l}{a=\frac{1}{2}}\\{b=1}\end{array}\right.$，∴函数y=-2asinbx=-sinx，
∴最大值和最小值分别为1，-1．

点评本题考查三角函数的最值，涉及待定系数法，属基础题．

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