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2024年河北省初中学业水平考试乾卷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·

2024年河北省初中学业水平考试乾卷物理试卷答案第一部分

8.一列沿x轴正方向传播的简谐横波的波源在坐标原点,波源从r=0时刻开始振动,=0.4s时刻的波形如图所示(波恰好传播t=0.4sx=2m到x=2m处),下列说沫正确的的是5m/sA.该横波在这种介质中的波速大小为5m/sB.平衡位置在x=2m处的质点,在=0.5s时刻位于波谷x=2mC.波源的振动方程为y=0.02sin(4x)my=0.02sin(4πt)mD.平衡位置在x=1m处的质点在半个周期内向右移动半个波长x=1m

2024年河北省初中学业水平考试乾卷物理试卷答案第二部分（待更新）

1.某实验小组用图甲电路来研究遏止电压Ut与入射光束频率ν之间的关系,实验小组选取金属M、N作为光电管的阴极材料,得到相应的Uc-y图像分别如图乙中I、Ⅱ所示。下列说法正确的是A.图甲中b端应接电源的负极B.与N相比,金属M的逸出功更小C.图乙中两条直线必平行且斜率均为普朗克常量D.断开开关用红光照射光电管阴极时电流表示数为I1,用蓝光照射同一阴极时电流表示数为I2,,则必有I1