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已知关于x方程x2-6x+m+4=0有两个实数根x1,x2 (1)求m的取值范围. (2)若x12=4x22,求m的值.
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小白鼠是研究生命活动调节的常用实验动物.回答下列有关问题 1研究人员将鼠笼中暗设的电极突然通电发现小白鼠迅速将踩住电极的前肢移开小白鼠躲避电击的过程主要是通过调节来完成的该过程中的效应器是指前肢的. 2研究人员发现小白鼠的肝细胞膜上存在着与胰高血糖素特异性结合的糖蛋白这说明激素调节的特点是. 3研究发现小白鼠的T细胞活性下降机体产生抗体的量会明显下降原因是.
人体内环境稳态是机体进行正常生命活动的必要条件.神经﹣体液﹣免疫调节网络是机体维持稳态的主要调节机制.下列相关的叙述中正确的有几项 ①细胞内液血浆组织液和淋巴共同构成了机体内细胞生活的直接环境 ②神经调节的基本活动方式是反射完成反射的结构基础是神经元兴奋一般是从一个神经元的轴突传至另一神经元的树突或胞体 ③激素是通过体液的传输作用于靶细胞或靶器官的信息分子 ④血糖的平衡调节是通过体液调节完成的 ⑤恒温动物维持体温的恒定是通过神经调节完成了体内产热量和散热量平衡的过程 ⑥体液免疫过程中有吞噬细胞参与的阶段有两次.
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OnMarch252010KateandDavidOggheardthewordseveryparentdreadsTheirnewbornwasn'tgoingtomakeit.Theirtwins﹣﹣agirlandaboy﹣﹣wereborn14weeksprematureweighingjustovertwopoundseach.Doctorshadtriedtosavetheboyfor20minutesbutsawnoimprovement.Hisheartbeatwasnearlygoneandhe'dstoppedbreathing.Thebabyhadjustmomentstolive. IsawhimgaspbutthedoctorsaiditwasnouseKatesaid.Iknowitsoundsstupidbutifhewasstillgaspingthatwasasignoflife.Iwasn'tgoingtogiveupeasily. Stillthecoupleknewthiswaslikelygoodbye.InanefforttocherishherlastminuteswiththetinyboyKateaskedtoholdhim. IwantedtomeethimandforhimtoknowusKatesaid.We'dresignedourselvestothefactthatweweregoingtolosehimandwewerejusttryingtomakethemostofthoselastpreciousmoments. KateunwrappedtheboywhomthecouplehadalreadynamedJamiefromhishospitalblanketandorderedDavidtotakehisshirtoffandjointheminbed.Thefirst﹣timeparentswantedtheirsontobeaswarmaspossibleandhopedtheskin﹣to﹣skincontactwouldimprovehiscondition.Theyalsotalkedtohim. WeweretryingtohavehimKatesaid.Weexplainedhisnameandthathehadatwinandhowhardwehadtriedtohavehim. Thensomethingmiraculoushappened.Jamiegaspedagain﹣﹣andthenhestartedbreathing.Finallyhereachedforhisfather'sfinger.Thecouple'slostboyhadmadeit. EightyearslaterJamieandhissisterEmilyarehappyandhealthy. 1FromwhatcanwetellthatJamiewasstillalive? A.Hisheartbeat. B.Hispulse. C.Hisgasp. D.Hisunderweight. 2Whydidtheparentsliewiththebabyboyinonebed? A.Thefamilywantedtostaytogetherandkeepwarm. B.Thefamilywantedtohavetheirprivatespace. C.Theparentsweresotiredandwantedtorest. D.TheparentswantedtospendthelastminuteswithJamie. 3Whatcanbethebesttitleforthepassage? A.PrematureTwins B.Life﹣givingTouch C.First﹣timeParents D.LastPreciousMoments
某地经过开垦后荒山变为果林洼地成为鱼塘加快了地方经济的发展和人民脱贫致富奔小康的步伐.回答下列问题 1山顶和山脚种植了不同的果木这体现了群落的结构. 2调查该果林的能量流动过程发现上一营养级同化的能量不能100%的流入下一营养级原因是. 3若鱼塘的环境条件不变经过捕捞后某种鱼的环境容纳量会填“变大”或“变小”或“不变”原因是. 4鱼塘生态系统需要人工不断地添加饲料以维持其正常功能从能量流动和物质循环的角度说明其原因是.
某雌雄异株植物的性别决定方式为XY型花色有白色黄色红色三种由仅位于X染色体上的等位基因Aa和位于常染色体上的等位基因Bb共同控制相关色素的合成过程如图所示.回答下列问题 1该植物花瓣中色素的合成过程说明基因与性状关系是. 2两红花植株杂交子代出现了的黄花植株则子代中红花植株与白花植株的比例为. 3请从第2题杂交实验的子代中选择实验材料设计一次杂交实验以确定某白花雌株的基因型写出相关的实验思路并预期实验结果和结论..
DuringmymiddleschoolyearsIwasveryallergictoEnglishgrammar.1thetwoincidentsI2laterchangedmyviewaboutlearningEnglish.3IthinkitisreallyfuntolearnEnglishgrammar.ItoccurredwhileIwas4inthemysteriousworldofiPhone.MyEnglishteacherwrotetwosentencesonthe51Thekingwouldwearnoclotheswhichmakehimappeardifferentlyfromothers.2Thekingwouldwearnoclotheswhichmakehimappeardifferentlyfromothers.Glancingatthetwo6Ithoughttheteachermusthavemadeamistake7thesetwosentenceswerethesame.Suddenlytheclassburstintoaloudlaughter.OnlythendidI8thataddingacommacouldshowabigdifferencein9.Afterwardsomething10happenedtome11.AtthebeginningofmyEnglishclassonedaytheteacher12ourhomeworkassignment.Tomy13myteacherhad14out﹣lyinthesentence‘IstudiedEnglishhardly'.'Isn't‘hardly'anadverb?'Iaskedmyself.LaterofcourseI15whatwaswrong.Iwasassumingeveryadjectiveaddedwith﹣lystill16themeaningofthatadjective.NottillthendidIfindoutthat‘hardly'17meant‘almostnot'sowhatIhad18madeaworldofdifferencefromwhatIwantedtosay.InconclusionwhatIexperiencedenablesmeto19Englishistrulyamysteriousworldofart.What20itistolearnEnglishgrammar!1A.However B.Besides C.Therefore D.Instead2A.witnessed B.heard C.experienced D.described3A.Then B.Soon C.Now D.Later4A.shocked B.absorbed C.rooted D.trapped5A.phone B.door C.window D.blackboard6A.sentences B.words C.phrases D.questions7A.whether B.because C.when D.if8A.ask B.wish C.realize D.hope9A.life B.form C.time D.meaning10A.interesting B.exciting C.strange D.awkward11A.before B.together C.yet D.again12A.checked B.returned C.found D.finished13A.disappointment B.joy C.surprise D.relief14A.handed B.worked C.carried D.crossed15A.figuredout B.gaveaway C.searchedfor D.talkedabout16A.creates B.hides C.explains D.keeps17A.finally B.gradually C.actually D.frequently18A.written B.known C.said D.seen19A.expect B.understand C.respond D.introduce20A.trouble B.fun C.difference D.magic
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在基因型为AaXBXbAaXBY的果蝇产生正常配子过程中下列叙述错误的是
ItwasaFridaynightandIwas1arestaurantwashingdishes.Aplate2throughmywetfingersandfellontothefloorin3.Myfaceflushed发红andinsideIwasscreaming'Whyme!?'asifmy4wouldmaketheplatewholeagain.Thebrokenplatewasonlyoneofthemany5fightinginsideme.Therewereadozen6smallerbuturgentconcerns.Formeitwasimpossibletogetsomemuch7restorsomestudytimebeforeacomingexam.Ihadto8withthefamilyexpenses开销.SoIgotbacktowork.Itwas12a.m.whenIfinallyfinishedmywork.Igotonthe9homeandtookoutmynotestostudy.Igotthe10looksfrompeopleoutofbarsbecauseIwasstudyingonabusinthemiddleofthenight.Their11didn'tbothermeatall.Iknewsomethinghadtochangeinmyfamilyandit12tometobeginit.FortunatelyIalsoknewIhaddesireand13inmyblood.MygrandfatherwasamongthefirstMexicanimmigrantswho14inL.A..BothofmyparentsleftMexicointheirearlyteenageyearsandbeganworkinglong15asacookandamaid.Thespiritwas16generationswhichhelpedmebothinschoolandatwork.AsIwalkedthroughthefrontdoorathomeIsawmymotherhadfallenasleep17medespiteherownlongday.Inmybedroomwatchingmybrothersbreatheslowlymademefeelmybody'stiredness.HoweveritwouldbeawhilebeforeIcould18theminsleep.Ihadanessay19earlythenextmorningandMs.DePaolodoesn't20latework.1A.inthemiddleof B.inthefrontof C.inthecornerof D.inthebackof2A.slipped B.flew C.jumped D.slowed3A.slices B.pieces C.blocks D.sheets4A.scream B.cry C.voice D.shout5A.tasks B.difficulties C.worries D.matters6A.another B.others C.other D.some7A.excited B.attracted C.delayed D.needed8A.increase B.workout C.cutdown D.helpout9A.taxi B.bus C.subway D.train10A.strange B.casual C.friendly D.formal11A.observation B.stares C.laughter D.ignorance12A.felt B.jumped C.threw D.fell13A.promise B.wish C.courage D.ability14A.settled B.moved C.lived D.worked15A.years B.days C.hours D.minutes16A.handedin B.passeddown C.passedaway D.turnedto17A.waitingfor B.watchingon C.callingup D.searchingfor18A.take B.join C.hold D.keep19A.ready B.written C.due D.finished20A.receive B.check C.accept D.assess
某种产脂肪酶菌常被用作饲料添加剂如表是从土壤中初筛该菌的培养基配方请回答下列问题 1在上述培养基中榄油能为产脂肪酶菌提供.为增大产脂肪酶菌的浓度需用该培养基进行富集培养富集培养基宜选用液体培养基的原因是. 2用涂布平板法分离产脂肪酶菌时在上述培养基的基础上还应加入和溴甲酚紫碱性条件下呈紫色在酸性条件下为黄色.在平板上产脂肪酶菌菌落的周围会出现黄色圈原理是.筛选时常选择菌落大黄色圈直径大的菌落这说明此菌落. 3菌落是指由一个细胞繁殖而来的肉眼可见的子细胞群体.在平板上有的菌落较小呈乳白色表面光滑无丝状物这些菌落可能为填“细菌”或“霉菌”.有的菌落连成一片形成原因最可能是. 4研究发现在饲料中添加产脂肪酶菌剂后动物的体重明显增加这说明.
下列有关内环境稳态及调节的叙述错误的是
Inmostartmuseumsthepaintingsonthewalljustlookflatbutsometimesvisitorscomeacrossanimagethatappearstobethree﹣dimensional.Theartisthascleverlyusedcolorslinesandshadingtogivethepaintingsomedepthmakingitmorerealistic.Theartistictechniqueofcreatingthree﹣dimensionalimagesofsomethingonaflatsurfaceiscalledtrompeI'oeil.TodaysomeartistsareadaptingtheideaoftrompeI'oeiltomakethingsbecomeinvisiblewhichiscalledcamouflageart. Innatureusingcamouflagenotonlyallowsinsectsandanimalstohidefromtheirnaturalenemiesbutalsoallowsthemtogetcloseenoughtosurpriseotherinsectsorsmalleranimalsthattheywanttocatchandeat.Artistsarenothidingorpreparingtoattack.Insteadtheyareusingtheideaofcamouflagetomakeurbanspaceslooknicerortomakestatementswiththeirart. Itisnotdifficulttofindthingsthatwewouldliketomakedisappearsuchasthedullwallofalargeindustrialbuildingorthepolescarryingelectricitywires.Artistscanmakethesethingsmoreinterestingandinsomecaseslessvisible.Inmanyurbanareaslargebuildingshavebeenpaintedwithamazingpicturesthattrickoureyes.Thusordinarybrickwallsaretransformedintointerestingworksofart. Someartistsincludecamouflageintheirworktosaysomethingaboutthemodernworldwelivein.ForexampleAmericanartistTrinaMerrycamouflagespeoplesothattheydisappearinthelandscapesshe photographs.HerlatestseriesNewYorkCityblends融合womenandtheirenvironmenttocreateimagesthatcloselyexaminetherelationshipbetweenpeopleandwheretheylive.MyseriesshowsrespectforBigApplewomenwhofeeltheneedtoblendinwitheveryoneelseinNewYorkMerrysays.Ithinkmanywomenmoveherehopingtoliveacitylifewhentherealityisthatmostwomenhavetochangetheirfancydesignerheelsonthesubwayformorepracticalsneakers. 1Whichofthefollowingwordsbestdescribecamouflageart? A.Flat. B.Invisible. C.Dull. D.Disappointing. 2Whatisthepurposeofusingcamouflageinnature? A.Tomakeanimalslooknicer. B.Toexpresspeople'sartisticconcept. C.Tosurprisesmalleranimalsorinsects. D.Toprotectanimalsfromnaturalenemies. 3Fromthelastparagraphweknowthat. A.Merryfeeltheneedtofitinwithothersinthecity B.mostwomenwearfancydressesintheirdailylifeinthecity C.womeninNewYorkhavesucceededinbeingapartofthecity D.NewYorkcitycanpartlymirrorpeople'slifeinmodernsociety 4Thisarticleismainlyabout. A.aformofart B.theseriesofpaintings C.afamousartist D.thewomeninNewYork
Iwillneverforgetthedarknessthepainandstrongdesiretodie. NovemberarrivedgreyandbusyandgoingintoanevenmorestressfulDecemberIwasfilledwithanxiousthoughts.Avisittomyfather'sgraveisoftenagoodchancetocryandwhenIleaveIfeelalittle moreatpeace.Butthistimewasdifferent.IdrovehomeandeverynightfortherestofthatweekIcried. OnSaturdayIwatchedaTVprogramteachingbakingandthenIstartedtolearn.BytheendoftheweekendIhadatablecoveredwithsweettreats.Ipackagedthemupintinsattachedalabeltoeachofthemwithwinterloveonitanddroppedthemoffonafewofmyneighbors'porches.Itshockedmehowmuchitlightenedmymoodseeingasmallpackagelostonaporch.ThethanksIreceivedlaterfromtheneighborsmademelightup.Itfeltsogoodanditdistractedmefrommydarkthoughts. ByJanuaryIhaddevelopedaroutineonSundayI'dbakecookiesandpackagethemupandonMondayI'ddeliverthem.EveryweekIaddedafewdifferentpeopletomydeliveryroute.Thenthingsstartedshowinguponmydoorstep﹣ahomemadecupapairofsockswithcookiesandevenagiftcertificatefromthelocalbookstore.Everysingleonemeltedmyheart.ButwhatIreallyappreciatedwashowpeoplebegantosharetheirownstoriesofmentalhealthwithme.Thereisnogreaterhonorthantobetrustedwithanother'slife.Iwasoverwhelmedbytheloveandcareofmycommunity.Ithumbledmethatsomethingsosimplehadcreatedsuchincrediblekindness. Iwasshiftingintoanewseasonoflightwhilelettinggoofaseasonofdarkness.Itremindedmethatthereisbeautyinbeingkindandthatlifeistoughbutthereisaquietstrengthinknowingyouarenotalone. 1Whatcanweknowabouttheauthorfromthefirsttwoparagraphs? A.Shefeltlifewastoopainfultolive. B.Shewasinabadphysicalcondition. C.Shewasstressedduetoherfather'sdeath. D.Sherecoveredaftervisitingherfather'sgrave. 2Aftershestartedsharingcookieswithneighborstheauthor. A.gainedtrustandcarefromthem B.addedotherthingstoherdeliverylist C.feltherlifewasnolongerbusyorstressful D.foundsomeofthemhadmorementalproblemsthanher 3Whatisthemainpurposeofthispassage? A.Toexpressgratitudetocaringneighbors. B.Tosharehowbeingkindhelpedherregainhope. C.Tospeakofthebenefitsofbakingcookiesathome. D.Toshowtheimportanceofatrustedcommunity.
种群增长率是指单位时间内新增加的个体数占种群个体总数的比率可表示为×100%.调查某种群一段时间内某些特征的变化得到如图AB两条曲线以下分析正确的是
某省实行高考改革考生除参加语文数学英语统一考试外还需从物理化学生物政治历史地理6科中选考3科.学生甲想报考某高校的医学专业.就必须要从物理生物攻治3科中至少选1科则学生甲的选考方法种数为用数字作答
如图为人体下丘脑参与的部分调节过程示意图.回答下列问题 1人在寒冷环境中下丘脑神经分泌细胞分泌的激素A是激素B只能作用于甲状腺细胞的原因是.甲状腺激素在人体中的作用是. 2若图中“下丘脑→激素A→垂体→激素B”过程调节着人体内性腺分泌性激素某人下丘脑功能正常但性激素含量不足原因是垂体或性腺两种器官中的某一器官功能受损.临床上可通过给患者注射激素填“A”或“B”然后检测血液中性激素的含量变化进行诊断若则说明垂体功能受损.
假如你是李华你约好昨天去公交车站接你的朋友Dylan但你却迟到了10分钟令他很失望.请用英语给他写一封道歉信要点如下 1.向他表示道歉2.表达你对此事的认识3.请求他的原谅. 注意1.词数80左右 2.可以适当增加细节以使行文连贯 3.开头和结尾已为你写好不计入总词数. DearDylan Yours LiHua
In2013Tallinn爱沙尼亚首都塔林becametheworld'sfirstcapitalcitytoofferpeoplefreepublictransport.LastyearEstonia爱沙尼亚settheaimtobecomethefirstcountrywithfreepublictransportnationwide.Busesarenowfreeofchargein11ofits15counties. Tallinn'scitygovernmentcameupwiththeideaoffreetransportin2008.Eventhoughthecitypaidmorethan70%ofpublic﹣transportcoststicketpriceswerestilltoohighforpoorerpeople.Crowdednesshadalsobecomeaproblem.Since1991thenumberofpeopleowningcarshasdoubled. Opponents反对者thoughttheideaunaffordableandcritics批评者predictedthetransportsystemwouldbecomeovercrowdedandlackmoney. Surprisinglypublictransporthasimproveddespitea€12millionhittothesystem'sfinancesfromlostticketsales.Tallinn'spopulationhasgrownleadingtoanincreaseinlocaltaxintake.Additionalrevenue财政收入comesfromtouristswhostillhavetobuytickets.TheuseofpublictransportinTallinnhasgoneupby10%whilethenumberofcarsinthecityhasgonedownby10%meaninglesscongestion. NowothercountriesarelookingatEstonia'sexperience.TallinnofficialssaytheyhavehadinterestfromFranceSwedenPolandItalyandGermany.Otherplaceshavealreadyintroducedfreepublictransportforcertaingroupsoratcertaintimes.InEngland1/3ofallbustripsarefare﹣freeespeciallyforpensioners领养老金者Walesrunsfreetravelatweekendstoimprovetourism.Butsofarfullfare﹣freetravelisrare.ThecityofHasseltinBelgiumranfreepublictransportfor16yearsbeforereintroducingfaresbecauseofincreasingcosts. 1Whichofthefollowingplacesoffersfullfare﹣freepublictransport? A.Hasselt B.Estonia C.Wales D.Tallinn 2WhatideadidtheopponentsandcriticsshareaboutTallinn'sfreepublictransport? A.Thegovernmentwouldn'thaveenoughmoneytocarryitout. B.Itwouldn'thelpwiththecity'sovercrowdedness. C.Itwouldleadtotheheavylossfromticketsales. D.Yearslaterthecitywouldreintroducefaresfrompeople. 3Whatdoestheunderlinedwordinparagraph4mean? A.pollution B.population C.crowdedness D.income 4WhydoyouthinksomanycountriesshowinterestinEstonia'sexperience? A.Itoffersmorejobopportunitiesforpeople. B.Ithelpstosolvethetrafficproblemincities. C.Itencouragespeopletostopdriving. D.Itattractsmoretouriststotakebuses.
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