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江西省南昌县2023-2024学年度第一学期九年级期中考试数学.考卷答案试卷答案
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Needsomehelpwithwritingyourstory?Clickheretocheckoutourhandyguide!27.HowcanonlineusershelpZhu'steam?PleasekeepaneyeonourTwitterorFacebookformoreup-to-datenews.A.Byprovidingsubsidies.21.Whichofthefollowingmeetsthestandardsofthecompetition?B.Byraisingawareness.A.ANobelPrize-winningstory.B.AUSbasedentry.C.Byplantingtrecsonlinc.C.Anoriginalentry.D.Afull-lengthnovel.D.Byofferingtcchnologicalsupport22.Whatwillateenagergetifhe/shewinsthecompetition?A.AprizcworthE399.99B.E100ofbookvouchersGermany'sfactorics,whichpowerEurope'scconomy,producedlessduringSeptemberthanatanytimeinC.AE200bookvoucher.D.AnissueofReader'sDigestthepasttwoyears,whichexpertssaycouldbeanindicatorofanapproachingEuropeanrecession()23.Fromwhichisthetextprobablytaken?TheS&PGlobalManufacturingPurchasingManagers'Index,orS&PGlobalPMI,foundthatGermany'sA.Aspeech.B.Awebsite.C.Aguidebook.D.Anewsreport.manufacturingactivitydroppedto47.8inSeptember,from49.1inAugust.Thesurveysaidthedropinfactoryoutputwasduetocustomerseitherputtingofforcancelingordersbecauseoffast-risingpricescausedbymoreBexpensivefuelbills.ZhuDejun'sfirstjobaftergraduatingfromcollegewasasaroaddesignengineerataninstituteinhishometown,AlshaaLeague,NorthChin'sInnerMongoliaautonomousregion.In2011,whenZhuwasJoeHayes,asenioreconomistatS&PGlobal,saidwhilethewholeworldisinthemiddleofaconductingaroadsurveyalongwithhiscolleagues,hesawaplantthathedidn'trecognize.Later,Zhulearnedmanufacturingdecline,Europeappearstobeattheslowdown'scenter."Productionfellataratewhichhasonlythattheplantwasasaxaultreewhichisanexcellenttreespeciesforsandfixationandafforestation(inbeenlargerduringcrisisperiods,"HayestoldTheTelegraph.Newordersalsofellatarapdpace,reflectingtinehesitancyamongclientstobuygoodsatexpensiveprices.'desertareas.It'scommonlyseen,thougheasilyignored.Knownasadescrtguardian,afullygrownsaxaultreecanholdtogethera10-square-meterpatchofdesertland,accordingtoZhu.TheanalysisalsoshowedthatEurope'sothermanufacturingpowerhouse,France,isstrugglingtoremainZhuquithisjobatthedesigninstitutein2014andjoinedanonprofitorganization,theSocietyofcompetitive.TheS&PGlobalPMIsaidFrenchcompanies'orderbooksshrankduringSeptember,witharoundEntrepreneursandEcologyConservation,orSEE,inthesameyear,concentratingontacklingdesertification.one-thirdofbusinessesreportingcustomershadcanceledordersbecauseofrisingpricesTheorganization,devotedtoecologicalprotectionandsocialresponsibility,waslocafedintheAlshaaLeagueofPhilSmith,anassociatedirectoratS&PGlobal,saidEuropeisexperiencing"acontinuousdownturn".HeInnerMongolia.Duringthepasteightyears,ZhuhasbeenleadingateamfromSEEtoplantsaxaultreesinaddedthatproducershadbeen"comingunderpressurefromadecpeningdropindemandaswellasansandyareasinAlshaaLeagueandotherplacesofInnerMongolia.energy-edriseincostinflation(通货膨胀)”In2014,theSEElaunchedaprojecttitled"onemillionsaxaultrees",aimingtoreachthatnumberfrom28.WhathappenedinEuropethisSeptember?2014to2023,turningthedesertofmorethan133,330hectaresbackintoasatisfyingecosystem.BytheendofA.Factories'efficiencyroseinEurope.2018,halfoftheorganization'sgoalhadbeenachievedB.Factories'productiondroppedinGermany.In2016,AntFinancecooperatedwithSEEtointroducetheAntForestplatform,notonlyencouragingC.Customers'purchasecontinuouslyincreased.peopletochoose"alow-carbonway"ofshopping,travelingandliving,butalsotohelpcontroldesertification.D.Fuelbills'pricesconstantlydecreased.Throughtheparticipationofagreaternumberofonlineusers,whogrowvirtualtrees,theSEEFoundation,29.Whatisthepossiblereasonforthefall?setupin2008,hasbeenprovidingsubsidies(forlocalherdsmenandfarmerswhilealsoofferingA.Thewholeworldisexperiencingrecession.tecnnologicalsupporttoplantsaxaultreesindesertareas.Now,Zhuistheheadofthefoundation'sprojecttoB.Factoriesfailtoremaincompetitive.fightdesertification.Healsogiveslecturesaboutsaxaultreesandthefightagainstdesertificationatschools,C.Expensivefuelbillsleadtoadropindemand.hopingtoraiseawarenessamongyoungpeople.D.Customershesitatetobuycheapgoods.24.WhatdidZhuDejundofirstaftergraduation?30.Whatdoestheunderlinedword"'shrank"meaninparagraph4?A.Heresearchedonsaxaultrees.A.Expanded.B.FadedC.Changed.D.Decreased.B.Hejoinedanonprofitorganization.31.WhatisPhilSmith'sattitudetowardsEuropeaneconomy?C.Hefoundwaystofightdesertification.A.Negative.B.Hopeful.C.Positive.D.Unconcerned.D.Hefocusedonroaddesignengineering.25.WhyaresaxualtreesplantedbyZhu'steam?A.Theyareeasilytakencareof.A"secretive"newspeciesoffroghasbeendiscoveredontheforestfloorinIndia'sWesternGhatmountainB.Theycangrowfastindeserts.range.Namedthestarrydwarffrogafterthemarkingsonitsdarkbrownback,itisjust2centimeterslong.C.Theyareperfectforholdingwater.Thefrog,whoseclosestrelativesareagroupofspeciesnativetoIndiaandSriLinka,istheonlymemberofD.Theycanfightdesertificationeffectively.anancientlineage(I)datingbacktomillionsofyearsago,accordingtoresearchersfromIndiaandtheUS26.WhatdidSEEdotocontroldesertification?ItisunclearwhetherthespeciesisdescendedfromAfricanorAsianfrogs.A.TheyteamedupwithAntFinance.AgroupofIndianandUSresearchersfirstcameacrossthelocalspecieshiddeninleaf-litteraspartofaB.Theyplantedonemillionsaxaultreeswiaerprojecttolookfornewfrogs,lizardsandsnakesinthenchlybiodiverseregionandstoreditinajarforC.Theyheldonlinelecturesondesertification.laterstudy.Genetictestingandacloserlookatitsshape,colouringandotherfeatureshasshownthatitdoesn'tD.Theyencourageddonationfromonlineusers.matchanyexistingspecies第2页共4页
分析根据圆的性质，确定最短弦对应的条件，即可得到结论．
解答解：圆心坐标D（1，0），
要使过P点的弦最短，则圆心到直线的距离最大，即DP⊥AB时，满足条件，
此时DP的斜率k=$\frac{0+1}{1-2}$=-1，
则弦AB的斜率k=1，
则此时对应的方程为y+1=x-2，
即x-y-3=0，
故选：A．
点评本题主要考查直线方程的求解，根据直线和圆的位置关系确定最短弦满足的条件是解决本题的关键．
