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如图所示为哺乳动物机体中位于小肠绒毛基部的上皮细胞（a），不断增殖、分化形成吸收细胞（b）后向上迁移，补充小肠绒毛项端凋亡的细胞（c）的过程．下列叙述错误的是（ ） ①a、b细胞含有相同的遗传物...
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高三下学期生物《》真题及答案
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细胞作为生命活动的基本单位其结构和功能高度统一下列有关叙述正确的是①卵细胞体积较大有利于和周围环境进
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细胞作为生命活动的基本单位结构和功能高度统一下列说法正确的是①卵细胞体积较大有利于和周围环境进行物质
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细胞作为生命活动的基本单位其结构和功能高度统一下列有关叙述不正确的是
哺乳动物成熟精子中细胞质较少，有利于精子运动
小肠绒毛上皮细胞内有大量的线粒体，有助于物质运输的能量供应
哺乳动物成熟的红细胞表面积与体积之比相对较大，有利于提高气体交换效率
卵细胞体积较大有利于和周围环境进行物质交换，为胚胎早期发育提供所需养料
江苏卷细胞作为生命活动的基本单位其结构和功能高度统一下列有关叙述正确的是①卵细胞体积较大有利于和周围
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小肠粘膜上有大量绒毛绒毛表面是一层柱状上皮细胞上皮细胞顶端有许多微绒毛.如图是葡萄糖穿越小肠绒毛柱状
细胞作为生命活动的基本单位其结构和功能高度统一下列有关叙述正确的是①卵细胞体积较大有利于和周围环境进
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2009年江苏高考细胞作为生命活动的基本单位其结构和功能高度统一下列有关叙述正确的是①卵细胞体积较大
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细胞作为生命活动的基本单位其结构和功能高度统一下列叙述不正确的是
卵细胞体积较大有利于与周围环境进行物质交换，为早期胚胎发育提供养料
哺乳动物成熟的红细胞表面积与体积之比相对较大，有利于提高气体交换效率
小肠绒毛上皮细胞内有大量的线粒体，有助于物质运输的能量供应
哺乳动物成熟精子中细胞质较少，外形似蝌蚪，有利于精子运动
细胞作为生命活动的基本单位其结构和功能高度统一下列有关叙述正确的是①卵细胞体积较大有利于和周围环境进
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江苏细胞作为生命活动的基本单位其结构和功能高度统一下列有关叙述正确的是①卵细胞体积较大有利于和周围环
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细胞作为生命活动的基本单位其结构和功能高度统一下列有关叙述正确的是①卵细胞体积较大有利于和周围环境进
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下列哪些物质出入细胞时与细胞中的核糖体和线粒体无关
尿素通过细胞膜
人的小肠绒毛上皮细胞吸收葡萄糖
肾小管上皮细胞吸收原尿中的Na
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小肠绒毛上皮细胞吸收氨基酸
细胞作为生命活动的基本单位其结构和功能高度统一下列有关叙述正确的是①卵细胞体积较大有利于和周围环境进
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细胞作为生命活动的基本单位其结构和功能高度统一下列有关叙述正确的是①卵细胞体积较大有利于和周围环境进
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下列叙述正确的是①卵细胞体积较大有利于和周围环境进行物质交换为胚胎早期发育提供所需养料②哺乳动物成熟
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细胞的结构和功能高度统一下列有关叙述不正确的是
哺乳动物成熟的红细胞表面积与体积之比相对较大，提高了气体交换效率
小肠绒毛上皮细胞内有大量的线粒体，有助于物质运输的能量供应
哺乳动物成熟精子中细胞质较少，有利于精子运动
卵细胞体积较大有利于和周围环境进行物质交换，为胚胎早期发育提供所需养料
细胞作为生命活动的基本单位其结构和功能高度统一下列有关叙述正确的是①卵细胞体积较大有利于和周围环境进
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多选细胞作为生命活动的基本单位其结构和功能高度统一下列有关叙述正确的是
卵细胞体积较大有利于和周围环境进行物质交换，为胚胎早期发育提供所需养料
哺乳动物成熟的红细胞表面积与体积之比相对较大，有利于提高气体交换效率
小肠绒毛上皮细胞内有大量的线粒体，有助于物质运输的能量供应
哺乳动物成熟精子中细胞质较少，有利于精子运动
细胞作为生命活动的基本单位其结构和功能高度统一下列有关叙述正确的是①卵细胞体积较大有利于和周围环境进
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AnAmericanphotographerismakingcopiesofgreatartworkavailableforblindpeopleandthosewithverypooreyesight.Atleast285millionpeopleworldwideareeitherblindorconsideredvisuallyimpaired有缺陷的.Theyareunabletoseeorenjoyvisualfineart. RomeoEdmeadlosthiseyesightwhenhewasonlytwoyearsold.Butthathasnotstoppedhimfromlivinglifetothefullest.Hewenttocollageandstudiedjournalism.HenowlivesinNewYork.Hedependsheavilyonhisothersenses.ButhecannotexperiencethegreatworksofartintheCity.Heremembersavisittoanartcollectionwithhisgrandmother.WewenttothismuseumandIjustwanderedoffsomewhereandIstartedtouchingsomethingandallofasuddenalarmwentoff.Andaguardcamerunningoverandmygrandmotherwasallashamed.Romeoisnowabletousehisfingerstofeelartpaintings.Hecangetanideaoftheappearancebyfollowingthemarkings. JohnOlsononceworkedasaphotographerforLIFEmagazine.HedevelopedaprintingprocesstomaketheartofDaVinciandVanGoghtouchableforvisually﹣impairedpeople.Ibegantorealizehowimportantimages影像havebeentomeandwhattheyhaveallowedmetodo.Anditcausedmetowonderwhatitwasfortheblindnothavingaccesstoimages.Olson'scompanyiscalled3DPhotoworks.Itproducescopiesofartworkinthreedimensions﹣heightwidthanddepth.Thewholeprocesscantakeuptofourweeks. Thankstonewtechnology3Dartmaysoonhanginartmuseumsallovertheworld.Itgivesthevisually﹣impairedthechancetoexperiencethebeautyofvisualart. 1WhatmotivatedJohnOlsontomake3Dartforblindpeople? A.Thebenefitofhiscompany. B.RomeoEdmead'ssufferings. C.Hisappreciationtoblindpeople. D.Theimportanceofimagestopeople. 2Whatdoestheunderlinedworddimensionmean? A.aperiodoftime B.thesizeofasituation C.ameasurementinspace D.thewayofdoingthings 3HowwillJohnOlson'sworkinfluencethelifeofblindpeople? A.Theyareabletolivetheirlifetothefullest. B.Theycanhavethechancetofeelthebeautyofvisualart. C.Theydon'tneedtodependheavilyontheirothersenses. D.Theyhavefreeaccesstomuseumswithoutanydifficulty. 4Whatcanwelearnfromthepassage? A.Ittakesamonthorsotoproducea3Dartwork. B.3Dartisproducedbasedonheightanddepth. C.3Dartisdisplayedinartmuseumsallovertheworld. D.JohnOlsonisrichforwhathehasdonefortheblind.
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IntheUnitedStateswhenonebecomesrichhewantspeopletoknowit.Andevenifhedoesnotbecomeveryrichhewantspeopletothinkthatheis.ThatiswhatkeepingupwiththeJonesesisabout.Itisthestoryofsomeonewhotriedtolookasrichashisneighbors. Theexpressionwasfirstusedin1913byayoungAmericancalledArthurMomand.Hetoldthisstoryabouthimself.Hebeganearning＄125aweekattheageof23.Thatwasalotofmoneyinthosedays.HegotmarriedandmovedwithhiswifetoaverywealthyneighborhoodoutsideNewYorkCity.WhenhesawthatrichpeoplerodehorsesMomandwenthorsebackridingeveryday.WhenhesawthatrichpeoplehadservantsMomandandhiswifealsohiredaservantandgavebigpartiesfortheirnewneighbors. Itwaslikearacebutonecouldneverfinishhisracebecauseonewasalwaystryingtokeepup.TheraceendedforMomandandhiswifewhentheycouldnolongerpayfortheirnewwayoflife.TheymovedbacktoanapartmentinNewYorkCity. Momandlookedaroundhimandnoticedthatmanypeopledothingsjusttokeepupwithrichlifestyleoftheirneighbors.Hesawthefunnysideofitandstartedtowriteaseriesofshortstories.HecalleditKeepingupwiththeJonesesbecauseJonesisaverycommonnameintheUnitedStates.KeepingupwiththeJonesescametomeankeepingupwithrichlifestyleofthepeoplearoundyou.Momand'sseriesappearedindifferentnewspapersacrossthecountryforover28years. PeopleneverseemtogettiredofkeepingupwiththeJoneses.AndthereareJonsesineverycityoftheworld.ButonemustgettiredoftryingtokeepupwiththeJonesesbecausenomatterwhatonedoesMr.Jonesalwaysseemstobeahead. 1SomepeoplewanttokeepupwiththeJonesesbecausethey. A.wanttobeasrichastheirneighbors B.wantotherstoknowortothinkthattheyarerich C.don'twantotherstoknowtheyarerich D.wanttobehappy 2Itcanbeinferred推断fromthestorythatrichpeopleliketo. A.liveoutsideNewYorkCity B.liveinNewYorkcity C.liveinapartments D.havemanyneighbors 3ArthurMomandusedthenameJonesinhisseriesofshortstoriesbecauseJonesis. A.animportantname B.apopularnameintheUnitedStates C.hisneighbor'sname D.notagoodname 4AccordingtothewriteritistokeepupwiththeJoneses. A.correct B.interesting C.impossible D.good 5What'stheauthor'sattitudetokeepingupwiththeJoneses? A.Negative B.Positive C.Objective D.Supportive
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如图所示的xOy坐标系中x轴上固定一个点电荷Qy轴上固定一根光滑绝缘细杆细杆的下端刚好在坐标原点O处将一个套在杆上重力不计的带电圆环视为质点从杆上P处由静止释放圆环从O处离开细杆后恰好绕点电荷Q做圆周运动．下列说法正确的是
﹣IlovetheInternet.I'vecometoknowmanyfriendsontheNet. ﹣.Fewofthemwouldbecomeyourrealfriends. A.Ican'tagreemore B.I'mpleasedtoknowthat C.That'sforsure D.That'snotthecase
如图所示长木板AB倾斜放置板面与水平方向的夹角为θ在板的A端上方P点处以大小为v0的水平初速度向右抛出一个小球结果小球恰好能垂直打在板面上现让板绕A端顺时针转过一个角度到图上虚线的位置要让球从P点水平抛出后仍能垂直打在板面上则抛出的水平速度v不计空气阻力
ThereisanoldEnglishsayingLaughteristhebestmedicine.OnepersoncertainlywouldhaveagreedwiththisisNormanCousins. NormanCousinswastheeditorofamagazinecalledSaturdayReviewforalmostfortyyears.Healso1andspokeaboutworldpeaceandanti﹣warissues反战议题travelingtomanydifferentcountriestosharehis2. Inthe1960safterreturningtotheUnitedStatesfromabusyandtiringtriptoEurope.Mr.Cousinsgot3.Hediscoveredhehadastrangediseasethatcausedgreatpaininhisbones骨头. Inlessthanaweekafterhegotbackhecouldnot4it.Everymovethathemadewaspainful.Hewasnotableto5atnight.ThedoctortoldMr.Cousinsthattheydidnotknowhowtocure治疗hisproblemandhemightnever6theillness.Mr.Cousinshoweverrefusedtogiveuphope. Mr.Cousinsthoughtthattheillnesscouldbecausedby7thoughts.Hedidnotwanttotake8tocurehimself.Insteadhefeltthathappythoughtsorlaughtermightcurehisillness. Hebegantoexperimentonhimselfwhilestillinthehospitalbywatchingcomedyshowsontelevision.Mr.Cousinsquicklyfoundthattenminutesof9laughterduringthedaygavehimtwohoursofpain﹣freesleepatnight. Decidingthatthe10couldnothelphimMr.Cousinsleftthehospitalandcheckedintoahotelroomwherehecould11hisexperimentswithlaughter.ForeightdaysMr.Cousins12inthehotelroomwatchingcomedyshowsontelevisionreadingamusingbooksandsleepingwheneverhefelt13.WithinthreeweekshefeltwellenoughtotakeavacationtoPuertoRicowherehebeganrunningonthebeachfor14. AfterafewmonthsMr.Cousinswas15tocarryonhiswork.Hehadlaughedhimselfbacktohealth. 1A.laughed B.taught C.wrote D.copied 2A.magazines B.subjects C.photos D.ideas 3A.rich B.sick C.lonely D.famous 4A.stand B.realize C.face D.improve 5A.dream B.eat C.shout D.sleep 6A.gothrough B.lookafter C.getover D.findout 7A.unhappy B.pleasant C.silly D.clever 8A.food B.time C.medicine D.money 9A.unusual B.false C.real D.wild 10A.friends B.laughter C.experiment D.doctors 11A.begin B.end C.continue D.report 12A.rested B.worked C.studied D.played 13A.well B.tired C.afraid D.worried 14A.help B.exercise C.freedom D.fun 15A.able B.safe C.lazy D.uncertain
IneversawmyfatherhomefromworklateorillnordidIeverseemyfathertakeanightoutwiththeboys.Hehadnobobbiesbutjusttookcareofhisfamily. For22yearssinceIlefthomeforcollegemyfathercalledmeeverySundayat900am.Hewasalwaysinterestedinmylife﹣howmyfamilywasdoing.ThecallsevencamewhenheandmymotherwereinAustraliaEnglandorFlorida. NineyearsagowhenIboughtmefirsthousemyfather67yearsoldspenteighthoursadayforthreedayspaintingmyhouse.Hewouldnotallowmetopaysomeonetohaveitdone.AllheaskedwasaglassoficedteaandthatIholdapaintbrushforhimandtalktohim.ButIwastoobusyforIhadalawpracticetorunandIcouldnottakethetimetoholdthepaintbrushortalktomyfather. Fiveyearsagomy71﹣year﹣oldfatherspentfivehoursputtingtogetheraswingset秋千formydaughter.AgainallheaskedwasthatIgethimaglassoficedteaandtalktohimButagainIhadlaundrytodoandthehousetoclean. ThemorningonSundayJanuary161995myfathertelephonedmeasusualthistimehehadseemedtohaveforgottensomethingswehaddiscussedtheweekbefore.IhadtogettochurchandIcuttheconversationshort. Thecallcameat440am.ThatdaymyfatherwassenttohospitalinFlorida.IgotonaplaneimmediatelyandIvowed发誓thatwhenIarrivedIwouldmakeupforthelosttimeandhaveanicelongtalkwithhimandreallygettoknowhim. IarrivedinFloridaat100ambutmyfatherhadpassedawayat912pm.Thistimeitwashewhodidnothavetimetotalkortimetowaitforme. IntheyearssincehisdeathIhavelearntmuchaboutmyfatherandevenmoreabouteverysingleday. 1Weknowfromthereadingthatthefather. A.likedtopainthouses B.hadnofriendsaroundhim C.wasnothealthyinhisyouth D.thoughtofhisfamilyashisall 2Whenherfatherpaintedherfirsthousethedaughter. A.couldonlyaffordaglassoficedtea B.wastoobusytotalktoherfather C.coulddonothingbutholdapaintbrush D.spenteighthoursadayworkingwithherfather 3OnJanuary161995thedaughterfeltthatherfather. A.seemedtobealittledifferent B.hadnotimetophoneherasusual C.becameinterestedinchurch D.hadforgottentodiscusssomethingswithher 4Inthereadingtheunderlinedphrase‘gettoknowhim'mostprobablymeans. A.gethimtoknowher B.knowmoreabouthim C.gethimtoknowhimself D.makehimwell﹣known 5Whichisthebesttitleofthereading? A.PaintingHouses B.Daughter'sFamily C.FatherandI D.Father'sphonecalls
假定你是李华你的加拿大笔友Susan正在学汉语她给你发来邮件询问你的近况并请你为她推荐﹣本汉语读物.请给她回复邮件要点如下 1.表示感谢 2.介绍你的近况学习生活等 3.推荐中国民间故事ChineseFolkTales. 注意 1.词数100左右 2.可适当增加细节以使行文连贯. DearSusan I'mmorethandelightedtohearfromyou.﹣﹣﹣﹣ Yours LiHua
BeforeweleftLiYanpingexplainedtomethattheforceofgravitywouldchangethreetimesonourjourneyand1thefirstchangewouldbethemostpowerful.Thenwewereoff.Astherocketroseintotheairwe2pullbackintoourseatsbecauseweweretryingtoescapethepulloftheearth'sgravity.Itwasso3strengththatwecouldnotsayanythingtoeachother.GraduallytheweightlessenedandIwasabletotalkto4he.Whyisthespaceshipnotfallingbacktotheearth?OntheearthifIfallfrom5treeIwillfalltotheground.Iasked.Wearetoofar6theearthnowtofeelitspullhe7explainsowefeelasifnogravityatall.Whenweget8closetothemoonlittlebylittleweshallfeelitsgravitypullingusbutitwillnotbeaspowerfulapullastheearth's.Icheeredupimmediatelyandfloated9weightlessaroundinourspaceshipcabin10watchtheearthbecomesmallerandthemoonlarger.
2018年11月21日消息中科院合肥物质科学研究院核能安全所吴宜灿研究员获得美国核学会聚变核能杰出成就奖．关于核反应方程半衰期下列说法正确的是
某载人宇宙飞船绕地球做圆周运动的周期为T由于地球遮挡宇航员发现有T时间会经历“日全食”过程如图所示．已知地球的半径为R引力常量为G地球自转周期为T0太阳光可看做平行光则下列说法正确的是
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