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4.A【解析】将小车A的速度沿绳和垂直绳方向分解，沿绳方向的分速度大小即为B物体上升的速度大小，则二心、月随着小车A向左运动，9减小，则小车A做减速直线运动，A正确，C错误；物体B竖直匀速上升，组一UA=子拉力等于物体B的重力，拉力大小不变，由于0.减小，拉力在竖直方向的分力变小，则地面对小车A的支持力变大，B、D错误。

C.Aproviderofvoicesamples.D.Assistancetohealthcaredelivery.30.Whatcanwelearnabouttheparticipantsfromparagraph4?A.Thosewithalowvoicescorewillendupwithmentaldisorder.B.Thosewithahighvoicescorearemorethanthosewithalowone.C.Thosewithalowvoicescorearelesslikelytosufferheartproblems.D.Thosewithahighvoicescorearelesslikelytosufferheartproblems.31.Whatcanbeinferredfromparagraph5?A.Spotbuild-upcanbefoundinmedicalteststhroughvoice.B.Thescoresintheresearchmayexplainthepuzzleofvoice.C.Theautonomicnervoussystemmaycontributetoheartproblems.D.Aperson'slevelofhearthealthcanbeconveyedthroughhisvoice.0Solarfarmsofferonewaytomeettheworld'sdecarbonization(targets,buttheycouldalsobeusedtodealwithanotheroftheplanet'sbigproblems:lossofbiodiversity.Theapproachisstartingtotakeoff.ResidentsofBarnsdale,forexample,willsoonplayhosttoanewsolarfarmlinedwithgrassfieldofwildflowersandnativegrasses,whichBanksGroup,thedeveloper,sayswillpromotepollinating(insects.Theideacomesfromthecombinationoftwolong-termtrends:decliningnumbersofpol-linatinginsectsandthegrowingamountoflanddistributedtosolarfarms.AccordingtotheCenterforBiologicalDiversityinArizona,morethan40percentofinsectpollinatorsgloballyarelistedas"highlythreatened"-anissuethatcouldseriouslythreatenfoodsecurity.Mean-while,solar-energycompetencehasbeenincreasing.MatthewO'Neal,ascientistatlowaStateUniversity,wouldliketoseemoresolardevelopersseizethisopportunity.Thebenefitsofsuchprojectsdon'tstopattheinsects.ResearchfromYale'sCenterforBusinessandtheEnvironmentindicatesthatpollinator-friendlysolarfarmscanraisecropoutputonnearbyfarmland,increasetherechargingofgroundwaterandreducesoilerosion)In2018,aUSDepartmentofEnergystudyfoundthatifallexistingandplannedsolarfa-cilitiesnearsoybeanandcranberrycropsincludedpollinatorhomeandincreasedoutputbyjustonepercent,annualcropvaluescouldrisebyUS$1.75million,US$4millionandUS233,000,respectively."Farmerscouldidentifyunprofitableareas,suchaspoor,highlyerodiblelands,ascandi-datesforapollinator-friendlysolarfarm.There'sthepotentialtoincreasetheirnetincomewithpollinatormotivationprojects,saysO'Neal.Withenoughforwardthinking,thesestudiesshow,cleanenergycanprovidenewenvi-ronmentalopportunities."We'reataturningpointwithenergyproductionandwe'reseeingmoreopportunitiestoprovideextrabenefitsthatwouldn'thavebeenconsideredwitholdermethodsofenergygeneration,"saysO'Neal."Youneverheardofacoalmineplanningpolli-natorconservation,”【高三英语第6页（共10页）】904C·HL·