Nature：发现形成造血干细胞小生境的细胞身份在骨髓中形成造血干细胞小生境的细胞身份一直不清楚。现在，PaulFrenette及其同事识别出，表达nestin的间叶干细胞为形成小生境的细胞。这些细胞与造血干细胞有密切物理关系，表达高水平的参与干细胞维护的基因，它们的删除会降低造血先祖细胞的骨髓寻的(homing)功能。这项工作显示，骨髓中的干细胞小生境是两种截然不同的体干细胞(somaticstem-cell)类型之间的一种伙伴关系。（Natur...
Nature：三种干细胞类型之间的差别通过利用不同转录因子对分化的成年细胞重新编程而产生的“诱导多能干”(iPS)细胞，具有“体细胞核转移”(SCNT)所产生的“胚胎干”(ES)细胞和来自自然受精的胚胎的ES细胞的很多典型性质。然而，这三个细胞类型并不是相同的，现在它们之间一个有趣的差别已被发现：iPS细胞保留它们来自其中的供体组织的一个“外成记忆”，而基于SCNT的重新编程则将成年细胞的DNA甲基化状态重置为接近与ES细胞相似...
专题01必修第三册Unit1Natureinthebalance目录新知导航：熟悉课程内容、掌握知识脉络基础知识：知识点全面梳理，掌握必备重点记忆：关键点快速记忆，提升能力小试牛刀：考点剖析+过关检测，合理应用一、核心单词讲解1.harmn.vt.伤害,损害(1)harmsb./sth.=doharmtosb./sth.=dosb./sth.harm对某人/物造成损害,损害某人/物(2)harmfuladj.有害的,导致损害的学科网（北京）股份有限公司beharmfulto...对有害(3)harmlessadj.无害的2.l...
1tornadotornado2flood3hurricanehurricane4lightninglightning5thunderstormthunderstorm6sandstorm7floodhurricanelightningthunderstormsandstormtornadoearthquaketyphoontsunami/tidalwavevolcaniceruption洪水飓风闪电雷暴沙尘暴龙卷风地震台风海啸火山喷发DisastersofNature8Createwordwebsforthefollowingtwotermsandfindallthewordsthatarerelatedtothem.disasterstrikebreakoutoccurtakeplaceWhen/where/whatlasthith...
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SectionⅢGrammar—复习动词ing形式语法图解1探究发现①Walkinginthepark,shesawanoldfriend.②Havingfinishedthework,hewentouttomeethisfriends.③Beingill,hewassenttohospital.④Mygrannysatinthearmchair,readingthenewspaper.⑤Goingtherebyplane,youllarrivetomorrowmorning.⑥Havingbeentoldmanytimes,hestillmadethesamemistake.⑦Thoughhehadbeentoldmanytimes,hestillmadethesamemistake.⑧Thetrainwascaughti...
1语法精讲一、过去完成时的被动语态1．概念：过去完成时的被动语态表示动作在过去某一时刻或某一动作之前已完成，且主语与谓语动词存在被动关系。2．构成(1)肯定结构：主语＋hadbeendone(2)否定结构：主语＋hadnotbeendone(3)疑问句结构：Had＋主语＋beendone...特殊疑问词＋had＋主语＋beendone23．用法(1)在told,said,knew,heard,thought,found等动词后的宾语从句中，表示宾语从句中的动作已被做完时，要用过去完成...
Unit6InaNatureparkPEP五年级上册1课时2Let’slearnWriteandsay2一、看图，完成句子。1.Icanseea________overtheriver.2.Thereisa________infrontoftheriver.3.Arethereanytall________inyourcity?4.Themountainsarearoundthe________.5.The________isverybig.bridgehousebuildingsvillagetree3二、选择与句子意思相符的图片。A.B.C.D.()1.Thereisabridgeandmanytreesinthepark.()2.Thereisariverinfrontofthehouseandatalltree...
Section_ⅢGrammar—过去完成时的被动语态和间接引语语法图解1探究发现①Bythetimeitended,morethan700peoplehadbeenkilledand2,700hadbeeninjured.②Bythelate1890s,hehadmovedtoGalveston,wherehediedin1899,ayearbeforethehurricanestruck.③CoghlantraveledbacktoCanada—afterhehadbeenburiedinTexas!④Shesays,“Tomwasverykind.”→ShesaysthatTomwasverykind.2⑤Heasked,“Willyougototheparty？”→Heaskedwhether...
Unit6InaNatureparkPEP五年级上册1课时2Let’slearn~Let’sspell2一、判断下列单词画线部分读音是(√)否(×)相同。()1.A.cowB.howC.now()2.A.countB.aboutC.blouse()3.A.windowB.downC.know()4.A.aroundB.youC.mouth()5.A.soundB.outC.cloud()6.A.mouseB.fourC.trousers√√√×××3二、看图，填写单词。1.Thereisa________intheforest.2.Icanseea________.3.Canyouseea________behindthedoor？4.Thereisariverinfrontofthe___...
SectionⅤWriting—旅游景点介绍一、基本结构1二、增分佳句1．Myhometownisontherailwayline.我的家乡在铁路沿线。2．Inthewestsuburbsofthecitytherestandsasmallvillage.Thatismyhometown.市西郊有一个小村子，那就是我的家乡。3．Ourcountryisalargeonewithalonghistory.我们的国家是个历史悠久的大国。24．Greatchangeshavetakenplaceinmyvillageinthepast/last20years.在过去的20年里，我们村子发生了翻天覆地的变化。5．T...
SectionⅡWarmingUpReading—LanguagePoints一、这样记单词记得准写得对Ⅰ.基础词汇1.n．图解；图表；示意图2.n.火山3.n.灰；灰末4.n.飓风；风暴diagramvolcanoashhurricane15.n.问卷；调查表6.adv.在旁边；沿着边prep.在旁边；沿着的边7.n.数据库；资料库8.n.波浪；波涛vi.波动；起伏；挥手9.vi.vt.泉水般地喷出或涌出n.喷泉；源泉10.n.潜在性；可能性；潜能adj.可能的；潜在的questionnairealongsidedatabasewavefountainpote...
Unit6InaNatureparkPEP五年级上册1Let’stryLet’stalk课时12一、根据图片，选词并用其正确的形式填空。1.Thereisa________intheforest.2.Therearesome________onthelake.3.Therearesome________intheNaturepark.4.Arethereany________inthevillage?5.Arethereany________inthepark?riverducksrabbitsriverrabbitbuildingduckhillbuildingshills3二、单项选择。()1.—Arethereanylakesinthepark?—No，________.A.theyaren’tB....
AVolcanicEruptionAsthebestcandidate,Iwasappointedtocollectandevaluateinformationforadatabaseaboutdiversenaturaldisasters,suchashurricanes,typhoonsorthunderstorms.SometimesIdidthisbygivingoutquestionnairestothosewhowentthroughthem.ButsometimesIhadtogothroughactualdisastersmyself.TheMusakiVolcanowasoneofthem.Atthattime,Ilivedinabungalowalongsidethevolcanowithanovelistwhocamefortheappreciationofit...
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Cloning:whereisitleadingus?Cloninghasalwaysbeenwithus.Itisawayofmakinganexactcopyofanotheranimalorplant.In1996,thescientistssucceededincloningDollythesheep.Ontheonehand,thewholescientificworldpaidcloseattentiontothegrowthofthefirstsuccessfulclone,Dollythesheep.Ingeneralthescientistswerepraisedfortheirwonderfulscientificbreakthrough.Ontheotherhand,Dollysappearanceraisedastormofobjections.Itsudde...
Unit6InaNatureparkPEP五年级上册1Let’stry~Let’stalk课时12一、为下列图片选择正确的单词。（）1.（）2.（）3.（）4.（）5.（）6.DABCFA.riverB.lakeC.forestD.boatE.houseF.parkE3二、用所给词的适当形式填空。1.Let’s________(go)tothepark.2.________(be)thereariverintheforest?3.—Isthereariver?—No,there________(benot).4.Howmany________(child)arethere?5.Ioftengo________(boat)withmyparentsonweekends.goIsis...
MountKilauea,theworldsmostactivevolcano,isontheislandofHawaii.ItisnotfarfromMaunaLoa,thelargestvolcanointheworld.MaunaLoaandKilaueatogetherformtheVolcanoesNationalParkinHawaii.MountKilaueahasproducedlava(熔岩)morethanfiftytimesinthelastonehundredyears.Atthismoment,redhotlavaispouringoutofKilauea.Ithasbeendoingthissince1983.1Sometimesthelavamovesslowly.Atothertimesitpoursoutveryfastasahugeamount...
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SectionⅣOther_Parts_of_the_ModuleEarthquakesAroundthePacificAbout400earthquakesoccurworldwide①everyday,morethanahundredthousandinayear.①worldwide/ˌwɜːldwaId/adj.全世界的[原文呈现][读文清障]1[读文清障][原文呈现]②besituatedin坐落于，位于③active/æktIv/adj.积极的；活跃的其比较级、最高级是分别在其前加more,most。④therehavebeen为therebe结构的现在完成式。⑤coveranareaof覆盖面积达Chinaissituat...
