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重庆市2024届高三年级下学期3月联考物理试卷答案试卷答案

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therwisegotosteanddistrbuingpofainghunger.Weworkwithmanufactuersretailers,andfamerstoreduceoodwasteandgetrescudfopeopeed.Weidentfyfoodatriskofgoingaste,offrreseuedfodofodbanks,safeyshipfoodoverlongdistancesandkeepfoodfreshlongeronceitreachesafoodbank.28.WhatdoweknowaboutthefoodinAmerica?A.Itisbarelyenough.B.Itisquiteabundant.C.Itiseasilyavailable.D.Itisincreasinglyinsufficient.29.Whatdoestheunderlinedphrase"equatesto"inparagraph3mean?A.Consumes.B.Multiplies.C.Wastes.D.Equals.30.HowdoestheauthorrevealthefoodwasteinAmerica?A.Bymakingcomparisons.B.Bypresentingdata.C.Bylistingreasons.D.Byofferingexamples.31.WhatdoesFeedingAmericaactuallydo?A.Itteachespeoplehowtogrowfood.B.Iturgesgovernmenttotakeaction.C.Itsavesfoodfrombeingwasted.D.Itaimstorelieveworldhunger.OneofthemostcommonbeliefsamongresearchersisthathumansfirstarrivedinNorthAmerica16,000yearsago.Accordingtoarecentfossildiscovery,thatmightnotbetrue.ThenewfindingsuggeststhathumansmighthavearrivedinNorthAmericafarearlier.In2ol3,adamagedmammoth(猛犸象)skullandotherbonesthatlooked“deliberatelybroken"werefound.Thedamagetothebonessuggestedthathumansweretheoneswhocausedittomaketools.Carbon-datinganalysissuggestedthepiecesareroughly37,000yearsold.Thisdiscoverycouldshiftourunderstandingofhumans'earliestexistenceinNorthAmerica.Thesefossilssuggesthumanskilledanimalsintheareamuchearlierthan16,000yearsago.PreviousresearchledscientiststobelievethefirsthumansthatsettledinNorthAmericabelongedtotheClovisculture.Thiswasagroupofpeoplewholeftbehindcarefullymadetools16000yearsago.However,carbon-datinganalysisofthemammothbonesindicatesthatthesiteisaround36,250to38,900yearsold.Thatmeansit'stheoldestknownsiteleftbe-hindbyancienthumansinNorthAmerica."That'snottheonlyinterestingthingaboutthediscovery,"saidTimothyRowe,apro-fessorattheUniversityofTexas."Thesimilarfindingssupportinganearlierdateforhumanrivahavebeenmostlyignored.Thisisbecausetheyhavecontradictedpreviousresearch.Now,however,hethinksthere'sagoodchancethatresearcherswillfindevidenceofhumansfartherbackintime.Theumshapedbonesnsharpblades,whichweresdotakernmremns,Rowe.Thereareasosignsthattheycookedtheanimalboesvea【高三英语第6页（共10页）】·23-144C·

重庆市2024届高三年级下学期3月联考物理试卷答案第一部分

22.有额定电压均为6V的甲、乙两只灯泡,测得其I-U特性曲线如图14所示。正常发光时甲灯泡的电阻(选填“>”“=”或“<”)乙灯泡的电阻;若将两灯泡并联在电压为6V的电路中,则干路电流为A:若现将两灯泡串联后接在电源两端,要使其中一个灯泡正常发光,电源电压为V。

重庆市2024届高三年级下学期3月联考物理试卷答案第二部分（待更新）

10.在平面内有一传动装置,如图所示传送带MN上在O点处固定一竖直光滑绝缘细杆,细杆可与传送带MN一起随着传动装置水平移动,两个小球a、b套在杆上,小球a质量m,,电量为-q(q>0);小球b质量3m,不带电.初始时a球在杆的最靠近O端,且a、b球相距L.现让传动装置以v0向右匀速运动,整个装置位于垂直纸面向外的磁感应强度为B的匀强磁场中.a、b球发生的碰撞均为弹性碰撞,且碰撞过程中电荷量不发生转移,设光滑绝缘细杆足够长,磁场区域足够大,下列说法正确的是A.小球a、b第一次碰撞前,小球a沿杆方向的速度为2qBLu0mB.小球a、b第一次碰撞前,洛伦兹力对a球做功为qBLv0C.小球a、b第一次碰撞后,沿杆方向的速度分别为-qBLu2mqBLx12mD.小球a、b第一次碰撞后至第二次碰前经历的时间为yLv0