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已知x,y都是实数,且y=++2,求x+3y的平方根
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请回答下列相关问题 1为了实现海洋渔业可持续发展防止海洋生态系统的严重破坏人们通过建造海底人工鱼礁来改善海洋环境.这主要体现了建设生态工程所应違循的原理. 2转基因绵羊的胚胎在__母体内能够存活的生理学基础是. 3将目的基因插入农杆菌质粒的片段中以便目的基因进入植物细胞.利用该方法导入的目的基因的遗传一般遵循孟德尔遗传定律原因是. 4在基因工程中将目的基因导入受体细胞之前要枃建基因表达载体该操作的目的是该步骤中常用两种能产生不同黏性末端的限制醇对运载体进行切割这样做的优点在于可以防止.
近几十年来植物基因工程取得相当大的进展科学家将药用蛋白转向植物生产研究出了用转基因马铃薯生产人的血清白蛋白的方法.如图表示EcoRⅠBamHⅠ两种限制酶在质粒上的切割位点两种酶识别和切割位点见表.回答下列相关问题. 1该工程中适宜用来切割质粒的限制酶是原因是. 2获取血清白蛋白基因可以利用反转录法构建的文库中获取若利用PCR技术扩增血清蛋白基因设计引物序列的主要依据是还需要在引物的一端加上序列以便于后续的剪切和连接. 3将目的基因和质粒进行连接后需先用处理农杆菌以便将基因表达载体导入马铃薯细胞筛选含有目的基因的细胞需在培养基中添加. 4从含有血清白蛋白基因的马铃薯细胞中提取血清白蛋白需通过过程培养到愈伤组织从其中提取.
如图为植物根尖某细胞一个DNA分子中abc三个基因的分布状况图中ⅠⅡ为无遗传效应的序列.有关叙述正确的是
Interestratesarethoseofourcompetitors. A.ashightwiceas B.astwicehighas C.ashighastwice D.twiceashighas
Inwelloverhalfthelanguagesoftheworlditispossibletochangethemeaningofawordsimplybychangingthepitch声高levelatwhichitisspoken.Languagesthatallowthisareknownastonelanguages. Thenumberoftones音调inalanguagecanbedifferent.Thesimplestsystemshaveonlytwotoneshighvsloweg.Zulu;Yorubahasthreehighmidlow;Lushaihasfourextra﹣highhighmidlow;Thaihasfivelowmidandhigh﹣fallinghigh﹣risinglow﹣falling﹣rising;CantoneseChinesehassixmid﹣andlow﹣levelhigh﹣andlow﹣fallingandhigh﹣andlow﹣rising.Tonaldifferencesmayaffecteitherthevocabularyorthegrammarofalanguage.ProbablythemostwidelyknowncaseisMandarinChinesewhichhasfourtones. Grammaticalusesoftonearealsocommon.InseverallanguagesofWestAfricae.g.TwiBiniachangeoftonesignalsthedifferencebetweencertaintenseforms.InBiniforinstancealowtoneisusedforpresenttenseandahighorhigh﹣lowtoneforpasttense. Whenasetoftonesisproducedadjacent邻近的tonestendtoinfluenceeachother.Forexamplealowtonethathasahightoneinfrontofitwillusuallybeginwithadownwardpitchmovement.Inparticulartheinformationsystemofthelanguagecancausechangesinthepitchleveloftones.Inasentencewherethereisagraduallyfallingintonationthetonestowardsthebeginningofthesentencewillbespokenatahigherlevelthanthetonestowardstheend.Thisgradualloweringoftonesisknownasdowndrift.Itmayevenresultinahightoneattheendofasentencehavingthesamepitchlevelasalowtoneatthebeginning! 1.Whatisthetextmainlyabout? A.Tonelanguage B.Thenumberoftones C.Grammarandtones D.Changesintones 2.Whichofthefollowingseemstohavethelargestnumberoftones? A.Tailanguage B.MandarinChinese C.Lushai D.CantoneseChinese 3.Whatisspecialaboutsometonelanguages? A.Thesamewordsmayhavedifferentpitches. B.Thetoneshavelittleinfluenceonmeaning. C.Higherpitchesrefertothingsinthepast. D.Differenttonesareusedfordifferenttenses. 4.Howwouldahightoneinfluencethelowtonesfollowingit? A.Thelowtoneswillbeginwithalowerpitchmovement. B.Thelowtoneswillstartwithahigherpitchproduction. C.Thelowtonesarespokenatalowerlevel. D.Thelowtonesendwithahighertone.
Richiestudiedevenharderafterheenteredtheuniversity. A.Hewasahardworkingstudent B.Alwaysahardworkingstudent C.Thathewasahardworkingstudent D.Whileahardworkingstudenthewas
JamesMurraywasscholarwhowrotearticlesaboutthehistoryoflanguagesparticularlyEnglish.Inthemid﹣1870shewasearninghislivingteachingatMillHillSchoolaprivateschoolforboysnearLondonEnglishwherehelivedwithhiswifeAdaandtheirchildrenMurraywasanactivememberofthePhilologicalSocietyandinthesummerof1876aseniormemberFrederickFurnivallaskedifhewouldbecomeeditorofanewdictionary. MurraywasawarethatthePhilologicalSocietyhadbeenworkingonanewdictionaryfortwentyyearsandthatFurnivallhadbecomeeditoroftheprojectin1864.Thesocietymemberswantedtopublishadictionarythatwouldshowhowwordscameintobeinggivingquotations摘录fromearlyandlaterworksthatwouldshowhowthemeaningofeachwordhadchanged.Furnivallhadsentoldbookstovolunteerreadersaskingthemtofindquotationsthatshowedearlyusageofwords.Inthebeginningreadershadbeenenthusiasticbutaftertenyearsofsendinginsmallpiecesofpaperwithnonewsofhowtheoverallprojectwasprogressingmanyreadershadlostinterest.Furnivallhadbecomestuckwiththehugeamountofworkandhadneveractuallystartedcompiling编撰thedictionary. MurrayagreedtotakeoverFurnivall'sjobaseditoronconditionthatthesocietyfindapublisher.Inthelatespringof1878thedirectorsoftheOxfordUniversityPressagreedtopublishthedictionary.Theyofferedtoprovideasalaryandexpensesfortheeditorpayforthecostsofprintingandfindbuyerswhowouldbuyeachpartasitwaspublishedoverthetenyearsitwasbelievednecessarytocompletetheproject. Thesocietyhopedthenewdictionarywouldcompetefavorablywiththe1864editionofWebster'sAnAmericanDictionaryoftheEnglishLanguagethebest﹣sellingdictionaryonthemarket.Thenewdictionarywouldbeseventhousandpageslong﹣﹣﹣fourtimesthesizeofWebster'sbecauseitprovidedinformationaboutthehistoryofwordswhereasWebster'sdictionaryjustexplainedthemeaningofwords. 1.WhatdidJ.Murraydoforalivingbeforehewasinvitedtoeditadictionary? A.Writing B.ManagingthePhilologicalSociety C.Teaching D.Doingresearch 2.Theprojectpeoplegatheredinformationabouthistoryofwordsfrom. A.variousbooks B.actuallanguageuse C.membersofthesociety D.famousquotationsofthetime 3.WhatcanweinferaboutMurray'slifeafterhebecametheeditorofthedictionary? A.Heremainedanactivememberofthesociety. B.Heputallhisattentiononthework. C.Hereceivedpayfromthesociety. D.Hekeptlookingforbuyers. 4.WhatisthebiggestdifferenceofMurray'sdictionaryfromothers? A.Itfocusesonwherewordscamefrom. B.Itgivesexactmeaningaboutwords. C.Itwaswrittenbythousandsofpeople. D.Ittookaverylongtimetocomplete.
研究小组将水稻叶片置于一密闭恒温的透明玻璃容器内在不同的处理条件下测得容器内氧气量的变化如图所示下列有关叙述不正确的是
请回答下列有关酶的问题1酶在反应过程中具有高效性作用的原理是.2酶为什么这么娇气所有的酶都填有或没有调节生物体生命活动的作用.3在探究温度对淀粉酶该酶的最适温度是60℃活性的影响实验时为什么最后不能用斐林试剂来检测结果.
ItwasmyfirsttimetotakepartinasummercampinZhejiangUniversity.Inthemorningwearrivedweattendedinopeningceremony.Thereweremorethanfourhundredsstudentsinthissummercamp.IfeltveryhappybecauseIknewIcouldmakemuchmorefriendsinthisbeautifulcity.Ittookusnearlyonehourtolistenteachers'talk.Thenwehadtobeginourfirstexamitwasnotveryhard.OhIforgottotalkaboutourheadteacher.Hewasastudenttoobuthewasourteacherintwentydaysinthiscamp.Ithoughthewasagoodteacherandhewasveryhandsome.Itwasveryhappytomeethim.HewascomefromAustraliawhichisaverybeautifulcountry.InherclassnotonlycanwelearnmuchEnglishknowledgebutalsowecandevelopourspeakingEnglish.Wetalkedaboutmanythings.Whenitendedwegatheredtogetheratthegatetookaphotoasamemoryandlefteachothersaid:'goodbye'.HowunforgettableexperienceitissoIamexpectingthenextsummercampwhereIwillmakemorefriendsandbecomeentireindependentofmyparents.
已知荨麻草雌雄异株其性别由二对等位基因决定且经常出现雌雄败育无花现象杂交实验发现F1总是无花蕊雄株雌株=211再将F1雄株和雌株杂交F2也出现无花蕊•雄株雌株=211.怎么解释这种遗传现象呢如图解请进一步分析回答1以上图解属于假说一演绎法的环节其核心内容至少包括多选.①当基因A和基因B同时存在时A_B_和aabb一样不育无花蕊②基因型为A_bb的个体为雄株基因型为aaB_的个体为雌株③不同对的基因可以自由组合独立遗传2研究者采用育种方法很容易得到了纯合的雄株准备将此雄株与天然雌株杂交根据以上图解预测子代的性状及比例是.3若要验证某雄株个体的基因型能否用测交方法其原因是.
It'sgoodtohavethechildrentohelpsometimes. A.themselves B.itself C.oneself D.himself
胰岛B细胞内K+浓度为细胞外28倍细胞外Ca2+为细胞内15000倍与神经细胞一样都存在外正内负的静息电位.当血糖浓度増加时葡萄糖进入胰岛B细胞引起系列生理反应如图所示.细胞内ATP浓度增加导致ATP敏感的K+通道关闭K+外流受阻进而触发Ca2+大量内流最终导致胰岛素分泌.回答下列问题 1当ATP升高时ATP与ATP敏感的K+通道上某特定位点结合引起该通道关闭并触发Ca2+通道打开此过程说明ATP的作用是该特定位点的主要组成成份是. 2随着Ca2+大量内流导致胰岛细胞产生兴奋此时细胞膜两侧的电位为由此引起胰岛素分泌.胰岛素通过促进组织细胞加速葡萄糖使血糖降低.
Theplanthasthreenewgeneratorscombinationcapacityisgreaterthanthatofthefivewehadbefore. A.what B.that C.where D.whose
研究发现β﹣13﹣D﹣葡聚糖能强烈抗肿瘤其诱导肿瘤细胞凋亡过程中能促进bax基因表达抑制bcl﹣2基因表达并促进TNF肿瘤坏死因子分泌.下列有关叙述不正确的是
下列叙述正确的是
Althoughtheyarepretendinghardtobeyounggreyhair. A.givesthemaway B.takesthemaway C.putsthemaway D.keepsthemaway
Amaterialcanbereallyspecialwhenitwasnamedaftertheplacewhereit1createoriginally.That'certainlythecase2china.Andofalltypesofchinawhiteporcelain瓷isamongthemostfamous. Nowadaysthe3traditionmaterialhastakenonamodernlookinthe4handoffourChineseartistsintheModernWhitePorcelainExhibition.Andthekeywordhereismodern.Oneoftheworks5beaporcelainboat.Butlook6attentiveandyou'11seethattheboat7buildwithporcelainlookslikeatakeoutbox.Insidetheboatisastatueofababy.Thebabystandsforhumansandtheboatis8supportslife.Itsuggestswemayhavedonesomedamageto9environmentandthatwe'retreatinglifelikefastfood. Allthefourartistsgavewhiteporcelainamodemstyleeachin10theyownway.Andthisiswhattheexhibition'sthemecomesfrom.It'sadialoguebetweenthepastandthepresent. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
假定你是李华收到英国笔友George的邮件请你介绍中国家庭聚会的情况饮食时间活动等.请给他写一封邮件. 注意:1.词数100左右; 2.可适当增加细节以使行文连贯. DearGeorge Yours LiHua
WhilevisitingtheNorthpoleinwintermaynotbeatthetopofyourbucketlisttheever﹣changingICEHOTELwhichopeneditsdoorstovisitorsonDecember14thisyearmaychangeyourmind.200kmnorthoftheArcticCircleintheSwedishvillageofJukkasjārvithehotelwhichiscarvedentirelyfromiceisrebuiltannually. The35roomsbuilttoaccommodatevisitorsonallkindsofbudgetsvaryfromexpensivesuitestobasicroomsthatarefurnishedwithjustanicybedandareindeerskin.AmongthehighlightsthisyearistheSpruceWoodssuite.SculptedbyChristopherPascoeandJennieO'KeefeofCanadaitdescribesacampingscenecompletewithaclassicmicrobusaforestandevenanartificialcampfire. Thereisalsotheartfully﹣carvedLivingOceansuitetoremindvisitorsoftheimportanceofsavingouroceans.Theroomisfullofcarvedsealifethatincludescoralandasharkswimmingrightovertheicebed.Thesuiteisinspiredbyglobalwarmingandtheoverfishingthataffectsouroceans.saysartistJonathanPaulGreen.IalsothinktheideaofusingfrozenwaterfromariverinnorthernSwedentocreateanoceanwithshellsfishandcoralsisexciting. ThenearbyHavensuiteisamagicalgateoficeguardedbytwolargeanimals.WeareinspiredbythemeetingbetweenpeopleandwanttocreateanexperiencethatinvitescuriosityandcreativitysaysartistJonasJohansson.Itfeelslikeadreamtogettoworkwithicethatallowsourloveforlightshineandreflectiontowanderfreelyfromthoughttocreation. Regardlessofwhethervisitorsselectthecarvedsuitesorthebasiciceroomsthetemperatureisalwayssettoabone﹣chilling﹣5℃!Thatiswhyguestsareadvisedtosnuggle蜷缩upinsidesleepingbagsandwearglovesandwinterhatsallnight.Notsurprisinglymostendupspendingjustasinglenightatthisuniquehotelbeforemovingontotheconventionalandwarmerhotelsnearby. 1.Whatdoestheunderlinedphrasebucketlistmeaninthetext? A.Ashoppinglistofbuckets. B.Alistoftravellingdestinations. C.Alistofexpensivehotels. D.Alistofexcitingideas. 2.Whatcanweknowabouttheicehotel? A.Itisrebuilteveryyear. B.Itsroomsareexpensive. C.Itorganizescampingactivities. D.Itliesinacoastalcity. 3.WheredoestheinspirationofLivingOceansuitecomefrom? A.Artandliterature. B.Oceanlifeandvoyage. C.Climatechangesandhumaninfluence. D.Themeetingofpeople. 4.Whichofthefollowingisthebesttitleforthetext? A.AnAdventuretotheNorthPole B.AnExperienceClosetoNature C.ATasteofCold:ANightinaVillage D.AWinterDestination:Sweden'sIceHotel
﹣﹣﹣Wouldyougetmeabarofchocolatefromthekitchen? ﹣﹣﹣one? A.Theother B.Any C.Other D.Another
玉米是一年生雌雄冋株异花授粉植物其籽粒的颜色受两对等位基因Aa和Bb控制.A基因存在时能合成酶ⅠB基因存在时酶Ⅱ的合成受到抑制两对等位基因独立遗传.籽粒颜色的转化关系为白色黄色紫色.研究发现纯合紫粒玉米的花粉完全败育不具备受精能力其它类型玉米的花粉正常.将杂合白粒玉米和纯合紫粒玉米进行间行种植F1中收获得到的玉米共有三种类型白粒黄粒和紫粒.回答下列问题 1上述实例体现基因通过进而控制生物体的性状如籽粒颜色. 2F1中白粒玉米的基因型有种F1的白粒玉米中纯合子的比例是. 3从F1中随机选取一粒玉米通过其颜色“能”或“不能”判断其母本是杂合白粒玉米或纯合紫粒玉米理由是.
Iamsorryaboutourquarrel;youbeganit. A.though B.still C.yet D.ever
如图表示某种群的同化量在三个生命活动中分配比例的情况下列说法正确的是
Whileit'sthebooksthatmakealibrarybeinginlovelysurroundingsmayprovideinspirationandhelpyoutoworkalittlebitharder.Herearesomeofthecoolestlibrariesoftheworld. LibraryofBirmingham﹣BirminghamU.K. ThenewLibraryofBirminghamissaidtobenotonlyBritain'sbiggestpubliclibrarybutalsothelargestinEurope.DesignedbyDutcharchitectsthisreplacementfortheBirminghamCentralLibrarywasopenedin2013andhasawealthofresourceswithinitswallsincludingadultandkids'librariesmusiccollectionsaShakespeareMemorialRoomandevenagymroom.Gardenscrowntheroofwhilethechangingseasonsbringvariationsintheshadowsandreflectionsinside. NationalLibraryofFrance﹣ParisFrance TheNationalLibraryofFrancewhichnowcontainsanastonishingcollectionof30milliondatesbacktothe14thcenturyandthisroyallibrarywassetupattheLouvrebyKingCharlesV.ThelibrarywasmovedtoRuedeRichelieusitein1868withmajordesignworkcarriedoutbyFrencharchitectsHenriLabrousteandfollowinghisdeathJean﹣LouisPascal.Herethereadingroomsareeleganceitself.Therearemorethanjustbookstobefound. StateLibraryofNewSouthWales﹣SydneyAustralia ThepublicStateLibraryofNewSouthWalesholdsthehonorofbeingtheoldestinstitutionofkindinAustralia.ItwasoriginallytheAustralianSubscriptionLibraryin1826butitwasn'tuntil1942thatitspermanenthomewasready.DesignedbySydneyarchitectWalterLibertyVernonandcompletedin1910themagnificentsandstoneMitchellWingisoneofthearchitecturalhighlights. SeattleCentralLibrary﹣SeattleWashingtonUSA SeattleCentralLibrary'sdistinctivedesignensuresitstandsout.ArchitectRemKoolhaasisoneofthenamesattachedtoitsdesign.Architectssoughttoenvelopthe11﹣storybuildingwithalayeroftransparencyusingaskinofglassandmetal.Thefinishedarticlehousesabout1.45millionbooksandotherthingsaswellasmorethan400computersavailableforpublicuse.Thebuildingwhichopenedin2004wasincludedontheAmericanInstituteofArchitects'listofAmerica's150favoritebuildingsin2007. 1.Whichofthefollowinglibraryhasthelongesthistory? A.LibraryofBirmingham. B.NationalLibraryofFrance. C.StateLibraryofNewSouthWales. D.SeattleCentralLibrary. 2.WhatcanyoudoinLibraryofBirmingham? A.Attendaconcert. B.Actaplay. C.Takesomeexercise. D.Enjoynewtechnology. 3.WhatdoNationalLibraryofFranceandSeattleCentralLibraryhaveincommon? A.Theyhavecomputersavailable. B.Theyweremovedtoanewplace. C.Theywonawardsforarchitecture. D.Theyweredesignedbymorethanoneperson.
某植物的两对等位基因分别用Yy和Rr表示若基因型为YyRr的该植物个体自交F1的基因型及比例为Y_R_Y_rryyR_yyrr=9331下列叙述不必要的是
ABRAVEWOMAN LarraneLeachanativewomanhadadream.Shewantedto1adaycarecentreinherhome.She2anine﹣monthcollegecourseandgotherdiploma.Amonthaftersheopenedherdaycarecentreshewas3fivenativepre﹣schoolchildren. Everymorningthechildrensatin4andpassedaroundablackandwhitefeather.Thechildwiththe5talkedandtheotherslistened.Aftercircletimethegroup6outdoors. YesterdaytheywerepickingberriesandPalLarrane's7camealong.Larranegavethechildrenemptyjars8theyleftthehouse.Whileshewas9themhowtopickberriesonechildranofftowardthetrees.Larrane10afterherandwhiletheyweregonean80kgcougar11two﹣year﹣oldMikey! Larraneheardtheother12screamingforhelp.Sheranbackand13thelargecougarontopofthesmallboy.Mikeywasscreaminghelp! Larrane14thecatbytheneck.AllIwasthinkingwassaveMikeyshesaid.Larrane15thecougararoundtofaceherand16thecat'spawtostoptheanimalfromscratchher.Iwas17.WhatdoIdonow?saidthe154cmdaycareworker.ShecalledtoPaland18thecougartotheground.ShetookMikeyinherarmsandranasthedogchased追赶the19upatree.ThankGodforPal.HesavedthedaysaidLarrene.Mikey'smotherwashappyLarrane20thecougar.ShesaidLarranesavedmyson'slife. 1.A.open B.lookat C.workat D.improve 2.A.ran B.bought C.taught D.took 3.A.catchingupwith B.lookingafter C.worriedabout D.carefulwith 4.A.apark B.aforest C.theplayground D.acircle 5.A.feather B.friend C.food D.jar 6.A.talked B.slept C.went D.came 7.A.brother B.daughter C.son D.dog 8.A.if B.as C.since D.though 9.A.making B.giving C.showing D.helping 10.A.cheered B.ran C.shouted D.begged 11.A.ate B.jumpedon C.playedwith D.stole 12.A.children B.mothers C.teachers D.nations 13.A.attached B.caged C.saw D.shot 14.A.tookover B.touched C.pushed D.gotholdof 15.A.turned B.sent C.drove D.shocked 16.A.left B.bent C.forced D.tore 17.A.thinking B.screaming C.clear D.afraid 18.A.lifted B.sat C.placed D.threw 19.A.cherries B.child C.cat D.fear 20.A.guided B.killed C.fought D.saved
IjustcountedhowmanyforeignlanguagesI'vestudiedsofarinmylifeandit'sbeentwelve! IalwaysfollowmyinterestsandfindwaystoputmylanguagelearningintothingsI'malreadyinterestedin.Iliketoreadblogs博客inotherlanguages.1.ForthemostpartbloggerstendtowritethesamewaytheyspeaksoIdon'thavetoworrymuchaboutadoptingstrangetermsthatareonlyusedinwriting. Moviesarealsoareallygoodtoolespeciallyifyoucanfindsubtitlesinthelanguageyou'relearning.2theywillstillkeepyourbrainlisteningandreadinginthesamelanguage.Musicisanotherwaytostartlisteningtothingsinyournewlanguage.PersonallyI'msobadatunderstandinglyrics歌词eveninEnglishsothisonedoesn'treallyworkformebutIhavefriendswholearnalanguagethroughlyrics.Gamesareofcoursealsoanexcellentwayofstudyinganewlanguage.Alotoflanguagelearningcomputerprogramsincludegames.I'msupercompetitiveandifIplayanyofthemIcanbehookedforhours.3. Whentheinitialexcitementoflearninganewlanguagebeginstofadeitcanbehardtostickwithit.ThehardestbitformeiswhenI'mcomfortableenoughwithalanguagetounderstandmostthingsandmakemyselfunderstood.I'mactuallystuckatthisstageinNorwegian.4.IdeallyIshouldsignuptotakeabiglanguageexam.EachtimeIstartgettingself﹣satisfiedit'stimetotakeanewcourseorsignupforonlinelessonsortakeupsomesortofchallengethatwillrequiremetolevelupmyskills. 5.ThebestlanguageclassI'veevertakenwasmybeginner'sRussiancourseatuniversitywheremyprofessorneverusedanyEnglish.ItgottothepointwhereIwouldkindofjustforgetaboutEnglishwhileinRussianclasswhichhelpedmetoreallyimmersemyselfintheRussianlanguageanddoawholelotwiththelimitedRussianIhad. A.That'sreallyuncomfortable B.Whateverlanguagesthey'retranslatedinto C.IalsotrytothinkinthelanguageI'mlearning D.It'stimewellspentifI'mlearningthelanguage E.Computergamesalwaysmakemefeelwornout F.Thoughtheydon'talwaysexactlymatchwhat'sbeingsaid G.Ifoundthemtheperfectlearningtoolbecausethey'reusuallywritteninorallanguage 1. 2. 3. 4. 5.
假如你班李津男和王英女两位同学在高三阶段有不同的学习方法请描述下列各图并谈谈你的看法. 注意: 1词数不少于100; 2可适当加入细节使内容充实行文连贯; 3开头己给出不计入总词数. LiJinandWangYingaretwostudentsofSeniorThree.Theybothworkhardbuttheyhavedifferentlearningmethods. .
研究发现肿瘤细胞的特征之一是缺乏细胞凋亡的过程而中药可以通过调控原癌基因和抑癌基因的表达阻滞肿瘤细胞生长周期和影响细胞凋亡信号传导等方面诱导肿瘤细胞凋亡进而达到治疗肿瘤的目的.下列相关叙述错误的是
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