下列图形： ①半圆形； ②任意三角形； ③等边三角形； ④直角三角形； ⑤等腰直角三角形； ⑥圆； ⑦长方形； ⑧正方形． 其中，是轴对称图形的有　 　只有一条对称轴的有　 　．（填序号）

下列实验操作现象与对应的结论或解释正确的是

生态学家高斯取相等数目的双小核草履虫和大草履虫用一种杆菌为饲料放在某个容器中进行单独培养和混合培养培养条件相同且这两种草履虫都没有分泌杀死对方的物质．结果如图所示．回答下列问题 1图A中双小核草履虫种群增长曲线为型大草履虫种群的增长速率在第8天时比第4天时有所填增加或降低．图中的K1填＞＝或＜K2． 2根据图B可知生物种间竞争的结果可以表现为除此外还常表现为． 3高斯混合培养实验中双小核草履虫和大草履虫都以一种杆菌为食大草履虫因竞争排除而死亡．某林区的猫头鹰和老鹰都以啮齿类动物为食可是它们都生存了下来．该林区猫头鹰和老鹰可以共存的原因是答出两点．

在一幅比例尺是1400000的地图上量得甲乙两地的距离是15厘米．甲乙两地的实际距离是千米．

根据线段图编一个数学问题并用方程解答．

林窗主要是指森林群落中老龄树死亡或因偶然因素如火灾龙卷风等导致成熟阶段优势种的死亡从而在林冠层造成空窗的现象．生态学家对某林窗的生态变化进行了研究请回答下列问题 l判断该林窗内的群落演替为次生演替依据是．随着时间的推移艾蒿紫荆的种群密度逐渐下降原因是． 2在调查上述物种的种群密度时为减少误差应注意．若用标志重捕法调查林窗内林鼠的种群密度所得数据往往比实际结果偏大可能的原因有列举两项． 3在研究该林窗能量流动的过程中第8年测得植物光合作用制造的有机物中的含碳量为9690kg/hm2•a被初级消费者摄入的仅为2070kg/hm2•a还有3600kg/hm2•a未被利用则其他部分是指中的含碳量．

Howtobemorefriendlyandsocial Ifyoutendtobeshyitcanfeeluncomfortabletoputyourselfouttheresocially.1Youcanmaketheextraefforttobemorefriendlyandopentootherswhilestillkeepingyourownpersonality. 2Thekeytoconnectingtootherpeopleisshowinginterestinthem.Whenyou'retrulyinterestedinsomeoneelse'sthoughtsfeelingsexperiencesstoriesandopinionsthey'lllikeyouforit.You'llmakefarmorefriendsbyshowingyourinterestratherthantryingtogetpeopleinterestedinyou. Begenuine真诚的.3Ifyou'rejustpretendingtolistenorcareotherswillpickuponit.Ratherthanpromotinggreaterconnectionyoureffortswilllikelyhavetheoppositeeffect.Noonelikestobemanipulated摆布.Ifyou'renotactuallyinterestedintheotherpersonthenstoptryingtoconnect. Payattention.4Bypayingcloseattentiontowhattheysayandhowtheyinteractyou'llquicklygettoknowthem.5Don'tignorethedetailssuchasrememberingsomeone'spreferencesthestoriesthey'vetoldyouandwhat'sgoingonintheirlife. A.Faking伪装takestalent. B.Focusonothersnotyourself. C.Littlethingsgoalongway. D.Gettingtoknowthemisthekey. E.Makeanefforttotrulylistentotheotherperson. F.Showinginterestinotherscan'tbefaked. G.Butyoudon'thavetobenaturallyoutgoingorthelifeofthepartytomakenewfriends.

LiMingyangwho______asthemaincenterontheChineseWomen'sBasketballTeamfortwoyearsisnowamemberofaJapanesebasketballclubwhichisconsideredshamefulbymanyChinese. A.hasserved B.hadserved  C.served D.wasserving

一个长方形的宽是3cm长是宽的2倍这个长方形的面积是平方厘米周长是厘米．

mewhenyougetitthroughandI'llpickyouupatyourworkplace. A.Calling B.Call C.Called D.Tocall

DNA甲基化是指在DNA甲基转移酶DNMTS的催化下将甲基基团转移到胞嘧啶上的一种修饰方式．DNA的甲基化可导致基因表达的沉默基因组总体甲基化水平低会导致一些在正常情况下受抑制的基因如原癌基因被激活从而使细胞癌变据此分析下列说法正确的是

根据短文内容从短文后的选项中选出能填入空白处的最佳选项.选项中有两项为多余选项. Manyofusfeelsleepyinwinterbutotherspeciesoftentakeitastepfurtherandhibernate冬眠.36Thebodyslowsdownandbreathingtemperatureandmetabolicandheartratealldecrease.Dormice睡鼠headundergroundandhedgehogs刺猬hunkerdownintheirnests. Hibernationseemstodothemgood.Buthumancannotbeddownforlongperiods.37Toworkoutwhywedonotfirstweneedtofindoutwhyanimalsdo.Themostobviousreasonforhibernatingistoavoidthecold.Conditionsareharshandthereislittlefoodtoeatasfewerplantsaregrowing.38Thentheyliveoffbody﹣fatreservesuntilit'stimetowakeup. Buta2015studyofdormicefoundthattheycontinuedhibernatingevenwhencoldconditionshadended.39Thekeyissueseemedtobeconnectedwiththeirmainfoodbeechtrees.Thedormiceneedtheirseedstoreproduceorforthebabydormicetogainenoughbodyfat.Inaharvestyeartheyproduceplentyofseeds.Somehowthedormicecouldpredictit.Otherwisetheystopreproductiontheseyearsandincreasetheirsurvivalbystayingunderground. 40Bystayingoutofsightthedormiceavoidedbeinghuntedbytheirpredators天敌likeowls.Untilrecentlypeoplethoughthibernationwasjustaboutenergysavingadefenseagainstcoldweatherandfoodshortageandnowwethinkit'smorepredatoravoidance.Thesurvivalratesinhibernationarecloseto100%. A.Soobviouslythereareotherreasons. B.Theywerehibernatingundergroundtosaveenergy. C.Hibernationisanextendedperiodofenergy﹣savingstate. D.Allkindsofanimalshibernatefrominsectstobirdsandprimates. E.Whyifitissobeneficialdowenothibernate? F.Thedormicehadanotherreasontostayunderground. G.Somanyanimalsfattenthemselvesupduringsummer.

WiththedevelopmentoftheInternetelectronicpayment1becomemorepopulartopaybillssofar.2actualtheprobabilityofpayingbillselectronicallyisdecreasingwithageandincreasingwitheducationand3seemsthatwomentendtouseelectronicpaymentata4highratethanmen.Inadditionsomeconsumersmayrespondnegativelytofeeswhenthey5chargebybanksforelectronicdeals6maykeepsomeconsumersawayfromelectronicpaymentandtowardsignaturepayment.Moreoverconsumers'useofelectronicpaymentwillvarywithfinancialconditionsandexpectationsaboutthefuture.Forexampleiftheyhavenegativeexpectationsabouttheirfuturefinancialconditionscustomersaremorelikely7payelectronically. On8wholebusinessesofferelectronicpayment9servicewhichnotonlyimprovecustomerservicebutalsocutcostsreducelatepaymentsandprovideagreenerbusinesssolution10customersimprovingthecompany'scompetitiveadvantage.

如图是某学生在制作DNA双螺旋结构模型活动中制作的一个模型①②③④分别代表四种不同的碱基模型下列叙述正确的是

鸡的孵化期是21天比鸭的孵化期短．下面理解错误的是

InternationalAirportSheremetyevoMoscow IfYou'veLostPersonalBelongings •OnBoard﹣Contacttheairline'srepresentatives •AttheAirport﹣Contact: ﹣SheremetyevoPoliceDepartment+7495578﹣22﹣55 ﹣UnclaimedluggagestorageroominTerminalC+7495578﹣23﹣26 ﹣UnclaimedluggagestorageroominTerminalD+7499500﹣65﹣52 domesticflights +7495753﹣86﹣41 internationalflights ★WhencollectingLostandFounditemsyoushallhaveanidentificationdocumentaboardingpassoraticketandalsotoindicateaplacewheretheitemswerelostandprovetheyareyours. IfYourLuggageIsLostorDamaged BeforeleavingthearrivalareapleaseturntotheLostandFoundcountertofileareport.Thewrittenclaimshallbesubmittedtotheairlinecompanynotlaterthansevendaysfromthetimewhentheluggagewastobecollected. Ifyourluggageisnotfoundwithintwenty﹣onedaysofthetimewhentheclaimwasfiledyouhavetherighttoclaimdamagesintheamountofnotmorethan600rublesperkilogram.Amountrefunded退款forahandluggagelostthroughthefaultofanairlineisnotmorethan11000rublesregardlessofitsweight.Amountrefundedfordamagedluggageiscalculatedbasedonthesametariffs关税. Keepyourflightdocumentsaticketboardingpassluggagetaganddelayedluggagereportfiledattheairportuntiltheendoftheprocedureforsearchingforyourluggage. LostandFoundserviceofAeroflotAirlines+7495544﹣33﹣25 from9:00to20:00 +7495753﹣86﹣41 24hours ★Forfurtherinformationpleasecontacttheairline. 1Whatshouldyoudoifyoufindyourpersonalpossessionslostonboard? A.Submitaclaimtothecompany. B.GototheLostandFoundcounter. C.Contacttheairline'srepresentatives. D.Contacttheunclaimedluggagestorageroom 2Howmuchmoneycanyouclaimifyour20﹣kilomgramhandluggageislost? A.600rubles. B.11000rublesatmost. C.12000rublesatleast. D.12000rublesatmost. 3Whichnumberwillyouprobablydialtoseewhetheryourlostluggagehasbeenfound? A.7495578﹣76﹣65 B.7495544﹣33﹣25 C.7499500﹣65﹣52 D.7495753﹣86﹣41

下列关于细胞分化衰老凋亡癌变在分子层面的解释正确的是

Areyouanoptimist?Doyoulookatyourglassandseeitashalffull?Doyoubelievethateverycloudhasasilverliningandthatthingsgenerallyturnoutforthebest?Doyoubelievethatifsomethingismeanttobeitwillbe?Ifyoureplyyestoallofthesequestionsthenyouareanoptimist.Youprobablyareenthusiasticcheerfulandoutgoing.Youmaybesuccessfulatworkandinlove. Butyoumaybemisguidedbecausethingsdon'tturnoutforthebest.Youmaybelievethatwhenondoorclosesanotheroneopensforexampleyoumayfailtoobtainanewjob;anotherchancewillcomearoundsoon.Wrong.Whenonedoorclosesanotherdoorslams砰然关上inyourface.That'sbitterreality. Nowabookhasbeenpublishedwhichconfirmswhatpessimists悲观者havesuspectedallalong.it'scalledThePositivePowerofDefensivePessimism.Itsauthorarguesthatdefensivepessimismcanleadtopositiveresults.Defensivepessimismisastrategyusedtomanagefearanxietyandworry.Defensivepessimistsprepareforthetingsbysettinglowoutcomesforthemselves.Theycarefullyconsidereverythingthatmaygowrongandplanforwaystohandletheseproblems.Andthisgivesthemasenseofcontrol.LawrenceSannoapsychologyprofessorsaysWhat'sinterestingaboutdefensivepessimistsisthattheytendtobeverysuccessfulpeoplesotheirlowopinionofthesituation'soutcomesisnotrealistic.Theyuseittomotivatethemselvestoperformbetter. Sofarsogood.Thisisnotrocketscience.Defensivepessimistspreparecarefullyandconsiderwhatmightgowrongwhetheratworkondateoreveninasportsgame.Itmakessensetohaveaback﹣upplan.TherearemanysayingsinEnglishurgingcaution.ForexampleDon'tputallyoureggsinonebasket. AndDon'tcountyourchickensuntiltheyhatch.Tohaveaconfidentandoptimisticapproachtolife'sproblemsisgood.ButlistentowhatWoodyAlientheAmericancomediansaysConfidenceiswhatyouhavebeforeyouunderstandtheproblem. Thereareprosandconstobeinganoptimistandapessimist.Don'tfeelbadifyouseetheglasshalfempty.YouarearealistButlightenupandhookupwithsomeonewhoseesthesameglasshalffull. 1What'sthepassagemainlyabout? A.Abookthathasrecentlybeenpublished. B.Howtobecomesuccessfulinlife C.Thedangersofbeingtoooptimistic. D.Thebenefitsofdefensivepessimism. 2TheunderlinedsentenceThisisnotrocketsciencePara.4means. A.it'snotadangerousthingtodo B.itisquitesimpletounderstand C.thecostisnotsohigh D.thereisnorealproof 3WhichofthefollowingEnglishexpressionswouldadefensivepessimistbelieve? A.Don'tputallyoureggsinonebasket. B.Theglassishalffullnothalfempty. C.Whateverwillbewillbe. D.Everycloudhasasilverlining. 4Thewriterwouldprobablydescribehimselfas. A.anoptimist B.adefeatist C.arealist D.ascientist

化学用语是学习化学的基本工具请用化学符号填空． 1地壳中含量最多的金属元素 22个氮分子 3硫酸亚铁 4最简单的有机物

某二倍体植物的体细胞内的同一条染色体上有M基因和R基因它们编码各自蛋白质的前3个氨基酸的DNA序列如图起始密码子均为AUG．下列叙述正确的是

AlibabahasbecomeChina'slargestonlinecommercialcompanyaprofitof1.47billionyuanin2010. A.earns B.earning  C.earned D.tohaveearned

﹣HasIngridhandedinherpaperyet? ﹣I'mnotsure.Sheonitlastweek. A.wasworking B.hasworked  C.worked D.hadworked

流感是冬春季高发急性传染病．如图表示流感病毒侵入机体后在树突状细胞内发生的过程据图回答问题 1病毒进入胞浆后合成病毒蛋白进入囊泡结构．如图可知该囊泡上有名称为蛋白能与溶酶体相锚定并融合抗原蛋白会被分解为与MHC﹣1分子结合形成复合物．返回到细胞膜表面与T细胞表面受体TCR结合一方面T细胞会增殖分化为与靶细胞的密切接触使细胞裂解死亡．另一方面细胞在少数病毒刺激下加上T细胞释放的作用使其增殖分化进一步产生抗体．由此可见树突状细胞在免疫过程中的作用是至少答出一点． 2病毒包膜上两种重要的糖蛋白血凝素HA和神经氨酸酶NA分别与病毒的吸附传入和传播有关．H和N后方数字表示不同病毒亚种如H7N9．不同的病毒结构特征不同且变异快你认为其原因是因此研发通用疫苗难度非常大．现在常用的流感三价裂解疫苗主要含有三种病毒的成分片段．

在正方形长方形等腰梯形等边三角形和圆中请按照对称轴的条数从多到少顺序排列＞＞＞＞

呼吸作用过程中线粒体内膜上的质子泵能将NADH即[H]分解产生的H+转运到膜间隙使膜间隙中H+浓度增加大部分H+通过结构①回流至线粒体基质同时驱动ATP的合成主要过程如图所示．下列有关叙述不正确的是

25分Onceuponatimesometinyfrogsheldacompetition.Thefirsttoreachthetopofaveryhightowerwouldbethewinner. Abigcrowdgatheredaroundthetowertoseetheraceandcheerthemon. Theracebegan.Nooneinthecrowdreallybelievedthatanyofthetinyfrogswouldreachthetopoftower.Theywillnevergettothetop!Theywillneversucceed!someonesaid. Onebyonethetinyfrogsbegantocollapse退下. ThecrowdkeptshoutingItistoodifficult!Nofrogwillmakeit! Moretinyfrogsgottiredandgaveupbutonecontinuedclimbinghigherandhigher.Thisonewouldn'tgiveup. Intheendhewastheonlyoneleft﹣theonlyonetogettothetop.Theotherfrogsnaturallywantedtoknow:Howdidthefrogmakeit Onefrogsteppedforwardtoaskthewinner.Itturnedoutthatthewinnerwasdeaf. Hehadwonbecausehewasabletokeephisownmind.Hewasabletokeeptrying.Hecouldn'thearcriticism;neithercouldhehearpraise. Welearnalessonfromthisstory:don'tletothers'praiseorcriticismtoholdyoubackonyourwaytosucceed. [写作内容] 1以约30个词概括寓言故事的大意. 2然后以120个词就如何对待别人的批评和表扬这个主题发表你的看法并包括如下要点: 1叙述这个寓言给你的启示以及你对他人的批评和表扬的态度; 2以事例说明他人的批评或表扬给你的感受和对你的影响; 3谈谈中学生应该如何对待老师的批评和表扬. [写作要求] 可以使用自己或他人的故事也可以参照阅读材料的内容但不得直接引用原文中的句子; [评分标准] 概括准确语言规范内容合适篇章连贯.

一辆卡车行驶2390米时前方道路出现事故等候15分钟后继续前行又走了3610米到达目的地．问这辆车行驶了多少千米

如图是红黄蓝三根彩带红黄彩带的长度比是23黄蓝彩带的长度比是67．红彩带的长度是蓝彩带的%红彩带的长度比黄彩带短%．计算结果百分号前面保留一位小数

WhenIsawmy10﹣year﹣oldavoidingthedirtyplateinthesinkormy8﹣year﹣oldfeelinguncomfortableaboutthewetsandinherhandsI'mremindedofatimewhenIwasunwillingtogetmyhandsalittledirty. Myparentsowneda500﹣acrefarminMontanatoraiseanimalssuchascowssheephorsesandsoon.Itwasduringthetimeofnewlifeanewbornlamboracalfthatmyfavoritechildhoodmemorytookplace.OneexceptionallycolddayIwascheckingonthesheepwithmymotherwhenshespiedaewe母羊introuble.Thepoorthingwastryingtodeliverherbabylambandneededourhelp.Mymothercalmlyheldtheewe'sheadandinstructedmetograbholdofthetwoprotruding突出legs. Ihesitatedandmusthavehadquitealookofpaniconmyyoungface.TheslimylittlethingsweredefinitelynotsomethingIwantedtotouch.ButIworkedupmycourageandwrappedmyfingersaroundthem.Icanstillrecallthefeelofunexpectedlyweaklegsandtheirsharplittlehoovesasifithappenedyesterday. MyheartpoundedinfearandexcitementasIpulledwithallmystrength.ThelambwasdeliveredsafelyandI'dneverseenanythingsobeautiful. IwasnostrangertoseeingfarmanimalsbeingbornbuttohaveahandinitwassomethingItreasuredthenandwilltreasureforever.IrememberfeelingexcitedwithdelighttoseemylambbeinglickedcleanbyhermotherandI'msureeveryonegotverytiredofhearingmetellandretellmyheroicstory.LookingbackI'msogladthatIdidn'trefusetogetmyhandsdirty.IfIhadthewonderfulmomentandthepreciousmemorywouldhavebeenlost. 24.Whatimpressedthewritermostduringherchildhood? A.Herdirtylittlehands. B.Herparents'largefarm. C.Helpingdeliverababylamb. D.Raisinganimalsonthefarm. 25.Howdidtheauthorfeelwhenshewasaskedtohelpaewedeliverherbaby? A.Somesympathy. B.Ratherfrightened. C.Quiteastonished. D.Highlydelighted. 26.Whatpointdoestheauthortrytomakeinthelastparagraph? A.Itisnotunusualtoseeanewlifecomingintotheworld. B.Itisnoteasytomakeupandtellaheroicstoryindailylife. C.Memoriesformedduringchildhoodareworthvaluingalllifelong. D.Youneedtogetyourhandsdirtytoexperiencesomethingprecious. 27.Whatcouldbethebesttitleforthepassage? A.AValuableLifeLesson B.ATidyandCleanChild C.AEweDeliveringherBaby D.ABeautifulNewbornLamb.

修一条长1千米的水渠已经修好了440米剩下的如果每天修80米还需要多少天修完

左起第22个图形是前83个图形中共有个．

艾滋病是由人类免疫缺陷病毒HIV侵入T细胞引起的疾病死亡率极高．下列关于艾滋病的分析错误的是

下列人体所必需的元素中缺乏后会导致贫血的是

设N0为阿伏加德罗常数的数值．下列叙述正确的是

长方体的表面中不可能有正方形．．判断对错

EnvironmentAwarenessWeek RegalConventionCentreHalls1﹣4 24﹣30March201110:00am﹣9:00pm Freeadmissionforall! SavetheenvironmentSaveourfuture Ourenvironmentneedshelp.Withtheparticipationofmorethan50organizationsEnvironmentAwarenessWeekisthebiggestpubliceducationeventdedicatedtoenvironmentalprotectionandconservation.Don'tmissit!Comeandknowmoreabout: TheThreatstoEarthHall1﹣Whatisglobalwarming?Howseriousispollution?Learnaboutdifferentenvironmentalproblemsfromouruniversitystudents.Protectourenvironment! TheSearchforrenewableEnergyHall2﹣canwegetelectricityfromwindsolarenergywavesriversandundergroundheat?GettheanswersfromSolarAceTefronTouchWindResourcesandotherparticipants. TheQuestforFreshwaterHall3﹣istheshortageoffreshwaterworsening?WhatareSingapore'ssolutionsfortreatingwastewater?HearfromFlowTechnologiesHydroMaxSolutionsandotherparticipants. The3RsandSaveEarthHall4﹣HowcanweREDUCEREUSEandRECYCLEtocutdownhouseholdwastes?FindoutfromtheGlobalGalaNetworkGreenEarthFoundationandotherparticipants. FormoreinformationpleasecallMr.PhilipKohat65531188sendanemailtoMrs.DaisySohatdaisy_soh@ief.orgorvisittheeventswebathttp://www.ief.org/caw 1ThemainaimofEnvironmentAwarenessWeekisto. A.educatethepubliconprotectingtheenvironment B.discussglobalwarmingandotherenvironmentalproblems C.explainwaysforproducingfreshwatertosavetheenvironment D.learnaboutrenewableenergysourcesthatprotecttheenvironment 2Theorganizeroftheeventis. A.GlobalGaiaNetwork B.CleanEnergyAgency C.GreenEarthFoundation D.GlobalEnvironmentFund 3WhichofthefollowingstatementsisNOTtrueoftheevent? A.Itwilllastaweekandthehallswillbeopen11hoursaday. B.YoucansendanemailtoMrs.DaisySohformoreinformation. C.Eachhallchargesthesameamountofmoneyastheother. D.LecturesinHall1willbegivenbyuniversitystudents.

某碳酸钠样品中含有一定量的氯化钠．为测定其纯度取20g样品于烧杯中加入90g水搅拌形成不饱和溶液往溶液中滴加氯化钙溶液100g至恰好反应反应后过滤称得滤液的质量为200g． 1恰好反应产生的沉淀质量为g． 2求样品中碳酸钠的质量分数 3求反应后滤液中溶质的质量分数

细胞的物质运输功能与其膜结构密切相关下列叙述错误的是

近年诞生的CRISPR/Cas9基因编辑技术可进行基因定点编辑．CRISPR/Cas9系统主要包括Cas9核酸内切酶和向导RNA其原理是由向导RNA引导Cas9到一个特定的基因位点进行切割．上述过程如图．下列相关叙述正确的是

如图它是由火柴棒拼成的图案如果在这个图案中用了51根火柴棒可拼成个三角形．

在个体生长发育过程中引起细胞种类增加的是

863700000读作最高位上的数字是表示个7在位上．

下列实验操作现象的预测实验解释或结论都正确的是

下列有关现代生物进化理论的叙述错误的是

玩具厂要生产200只玩具已经生产了60只用了3时．照这样计算完成这批玩具还要多少时

下列关于人体免疫的叙述正确的是

农作物的产量与光合作用的效率紧密相关科研人员尝试通过多种方式提高农作物的光合效率． 1在植物的叶肉细胞中存在着图1所示的代谢过程 在光照条件下CO2被固定成C3之后利用光反应产生的将其还原．研究发现RuBP羧化加氧酶还可催化C5与O2反应产生乙醇酸乙醇酸中75%的碳又重新生成CO2和C3的光呼吸过程．该过程降低了/促进了/不影响光合作用效率同时使细胞内O2/CO2的比值有利于生物适应高氧低碳的环境． 2根据对光呼吸机理的研究科研人员利用基因编辑手段设计了只在叶绿体中完成的光呼吸替代途径AP依然具有降解乙醇酸产生CO2的能力．同时利用RNA干扰技术降低叶绿体膜上乙醇酸转运蛋白的表达量进而降低从而影响光呼吸．检测三种不同类型植株的光合速率实验结果如图2所示．据此回答 ①当胞间CO2浓度较低时野生型植株与替代途径植株的光合速率相比． ②当胞间CO2浓度较高时三种类型植株光合速率的大小关系为．分析其原因是． 3基于上述研究请你提出一个可以进一步深入研究的问题．

1分InSouth﹣EastAsiamanyfarmerscannotaffordfarmequipmentsuchastractorssomostoftheworkisdonewithhumanlabor. A.clumsy B.compulsory  C.concrete D.conventional

2.5分下列物质中属于纯净物的是

从6时到9时时针按顺时针方向旋转了90°．判断对错

长方形有条对称轴正方形有条对称轴等边三角形有条对称轴圆有条对称轴．

施用外源激素调控植物生长发育是农业生产中的一项重要措施多效唑是应用广泛的一种植物生长调节剂．研究小组探究不同浓度的多效唑对小麦植株内源激素和光合作用的影响实验过程及结果如表．下列推断不合理的是

20分YoumayhaveheardofOsceolaMcCartyan88﹣year﹣oldwomaninMississippiwhohadworkedforover75yearsasa1woman. Onedayaftersheretiredshewenttothebankanddiscoveredthathersmallmonthly2hadgrowntoover＄150000.Thentoeveryone'ssurprisesheturnedaroundand3almostallofthemoneytotheUniversityofSouthernMississippiUSMfora4fundforstudentswithfinancialneeds.Immediatelyshemadenational5. WhatyouhavenotheardishowOsceola'sgifthad6mylife.Iam19yearsoldandthefirst7ofanOsceolaMcCartyScholarship. Iwasa8studentandIwasdeterminedtogotoUSM.ButI9beingqualifiedforaregularscholarshipbyonepointontheentranceexamsandascholarshipwasthe10wayIcouldattend. OneSundayIcameacrossthestoryinthepaperaboutOsceolaMcCartyandhergenerous11.ThenextdayIwenttothefinancialaidofficeandtheytoldmetherewasstillnomoney12formebutifanythingcameupthey'dcall. AfewdayslaterIwasgoingoutwithmymother13thephonerang.IwastoldIhadbeenchosentobegiventhefirstOsceolaMcCartyScholarship.Iwas14! McCartyworkedhardherwholelifewashingclothesbyhand.Nowthatsheis15shesitsmostofthedayandreadstheBiblethatiswhensheisnotgettingrewards.EverytimeIgotovisithershehasanew16.She'sevengonetotheWhiteHouse.Sheissohappyandproud.WehavetriedtotalkherintogettingaVCR录像机soshecantapetheprogramsandsee17onTV﹣shejustsmiles. McCartygavememuchmorethanascholarship.Shetaughtmeaboutthegiftof18.NowIknowtherearegoodpeopleintheworldwhodogoodthings.Sheworkedhardandhelpedothersandinturnshehasinspiredmeto19whenIcansomeday.So20Iplantoaddtoherscholarshipfund. 1A.café B.buffet C.laboratory D.laundry 2A.expenses B.profits C.savings D.wages 3A.returned B.donated C.delivered D.removed 4A.welfare B.project C.scholarship D.research 5A.headlines B.customs C.sympathies D.doubts 6A.affected B.formed C.disturbed D.ruined 7A.designer B.receiver C.contributor D.reporter 8A.considerate B.dedicated C.casual D.sensitive 9A.advocated B.regretted C.missed D.avoided 10A.normal B.wrong C.legal D.only 11A.gift B.idea C.decision D.plan 12A.left B.raised C.available D.enough 13A.since B.before C.though D.when 14A.shocked B.excited C.puzzled D.encouraged 15A.retired B.dismissed C.promoted D.transferred 16A.job B.hobby C.life D.award 17A.everybody B.everything C.herself D.us 18A.giving B.understanding C.receiving D.loving 19A.giveup B.giveback C.giveoff D.givein 20A.suddenly B.originally C.gradually D.eventually

溶酶体内含多种水解酶是细胞内消化的主要场所．溶酶体的内部为酸性环境pH≈5与细胞质基质pH≈7.2显著不同．以下有关叙述不正确的是

某北极冻原生态系统的部分食物网如图1所示该生态系统的能量流动情况如图2所示其中箭头表示能量流动方向箭头上方的数字为有关能量数值单位为×106J/cm2•a．请回答 1苔藓和地衣中的碳元素以形式传递到北极熊图1中北极兔驯鹿处于食物链的同一环节它们的总和称为． 2北极地区的动物在不同的季节一般都有换羽毛的习性它们的这种适应性特征是长期的结果．在全球变暖的趋势下北极熊的环境容纳量会增加下降基本不变． 3图中第一个营养级到第二个营养级的能量传递效率为D固定的能量除了图示的去向外还有．

化合物I是合成抗心律失常药普罗帕酮的前驱体其合成路线如图 已知CH3COCH3+CH3CHOCH3COCH＝CHCH3+H2O 回答下列问题 1A的名称．B的分子式为． 2A生成B的反应类型是C生成D的反应类型是． 3F的结构简式为H的结构简式为． 4化合物E中含有的两种官能团名称分别是写出一种同时符合下列条件的E的同分异构体的结构简式． ①能发生银镜反应和水解反应 ②核磁共振氢谱上显示4组峰 5参照上述合成路线以2﹣丙醇和苯甲醛为原料无机试剂任选设计制备的合成路线补出前面两步．

某实验室有两种酵母菌甲和乙在条件相同体积一定的培养液中单独培养种群数量増长都符合S型各自所能达到的环境容纳量为13个单位和5.8个单位．实验表明将甲乙混合培养时个甲所利用的资源相当于0.44个乙所利用的资源而一个乙所利用的资源相当于3.15个甲所利用的资源．请完成下列问题 1酵母菌在生态系统生物成分中属于．若单独培养母菌甲甲种群数量为单位个时种群数量增长速率最快． 2对上述培养液中酵母菌进行计数其实验操作是 ①先将静止放置的培养酵母菌的试管再取出1mL母菌液移人一只干净的试管 ②从1mL酵母菌液中取出少许滴在盖有盖玻片的上 ③将上述装片放在视野填较亮/较暗的显微镜下观察计数． 3若将甲乙混合培养两者的种间关系是．依据题中数据分析在生存斗争中取胜的一方是．

1在微生物作用的条件下NH4+经过两步反应被氧化成NO3﹣．两步反应的能量变化示意图如下 ①第一步反应是反应选填放热或吸热判断依据． ②1molNH4+aq全部氧化成NO3﹣aq的热化学方程式． 2近年来研究人员提出利用含硫物质热化学循环实现太阳能的转化与存储．过程如下 反应Ⅰ2H2SO4l＝2SO2g+2H2Og+O2g△H1＝+551kJ•mol﹣1 反应ⅢSs+O2g＝SO2g△H3＝﹣297kJ•mol﹣1 反应Ⅱ的热化学方程式． 3一定条件下不同量的CO2与不同量的NaOH充分反应放出的热量如下表所示 写出该条件下CO2与NaOH反应生成NaHCO3的热化学方程式．

Onceyouhavean______writtenplanthenexttrickistolearnhowtoworkiteffectively. A.solid B.abstract  C.intermediate D.temporary

甲乙两地相距175千米要画在比例尺是12500000的地图上应画厘米．

碘量法测定废水中的硫化物的实验装置如图．按图连接好装置检查气密性．移取足量的醋酸锌溶液于两支吸收管中取100mL水样于反应瓶中通入氮气一段时间移取10mL盐酸于反应瓶中80℃加热继续通入氮气．关闭氮气后往两个吸收管中各加入0.010mol•L﹣1的碘标准溶液50mL过量再加入盐酸3mL静置．加入淀粉指示液用0.010mol•L﹣1的硫代硫酸钠标准溶液对两支吸收管中的液体进行滴定共消耗80mLNa2S2O3溶液2S2O32﹣+I2═2I﹣+S4O62﹣． 已知废水中的硫化物酸性条件下易转化为剧毒硫化氢且醋酸锌可用于完全吸收硫化氢生成硫化锌沉淀．回答下列问题 1图反应器的名称是．通入氮气的目的是反应前反应后． 2实验室采用块状硫化亚铁与稀硫酸反应制取H2S下列发生装置中可选用的是填序号尾气处理使用硫酸铜溶液比氢氧化钠溶液效果好的原因是． 3反应瓶最佳采用加热填加热方式温度过高可能出现的后果是． 4加入碘标准溶液时吸收管中发生反应的化学方程式为． 5只使用一个吸收管可能导致测定结果偏填高或低． 6硫代硫酸钠标准溶液配制需要煮沸蒸馏水其目的是．0.010mol•L﹣1的硫代硫酸钠标准溶液不直接配制而是经过标定得到可能的原因是． 7废水中硫的含量为mg•L﹣1．

农业科学家将一个地区的品种与其他地区的品种杂交然后通过在两个地区间不断地反复交替穿梭种植选择鉴定最终选育出几种抗病高产的小麦新品种．下列叙述正确的是

2.5分下列做法中正确的是

反馈在神经网络中广泛存在．闰绍细胞是脊髓内的一种抑制性神经元如图表示脊髓前角运动神经元闰绍细胞共同支配肌肉收缩的途径．回答下列有关问题． 1脊髓部分在反射弧中属于．图中的效应器是． 2刺激c处在图中在abd选填处能检测到电位变化在abd选填处不能检测到电位变化．产生后一结果的原因是． 3闰绍细胞兴奋抑制/促进肌肉收缩．

Whileoverallratesofsuddeninfantdeathsyndromes综合征havedecreasedinrecentyearsdeathsfromsleepsuffocation窒息________overthesametimeperiod. A.double B.havebeendoubling  C.havedoubled D.doubled

教室门的打开和关上门的运动是既平移又旋转．判断对错

1分Whatdoyouthinkaboutthatnewlibrarian Sheisofagoodclerkforsheevendoesn'tknowhowtoclassifythebooks. A.somebody B.nothing C.something D.nobody

阅读下面材料在空白处填入适当的内容1个单词或括号内单词的正确形式. ShanxinoodlesAmatterworthbeingproudof AcommonlyusedgreetinginChinaisthequestionHaveyoueaten?Itindicatesthe61importantoffoodinChina.TheChineseare62extremeproudoftheircuisine烹饪.ForexampleShanxitakesfulladvantage.Itisfamousforitsnoodles63makeofwheat.Ithasarecordedhistoryofmorethan2000yearsinmakingwheat﹣flournoodles. EverykindofnoodleimaginablecanbefoundinShanxi.EvenMarcoPolo64inspirebythemakingoftheShanxinoodleswhichledhimtotaketherecipesbacktoItalyandEurope.65mostpopularShanxinoodleisthedaoxiaomian.Thisnoodleisshavedfromagiantblockofdough面团hoistedoverthechef'sshoulder.Thenoodlesareshavedoffdirectlyintoboilingwater.Thereisaphrase66describesthenoodle﹣makingprocessOnenoodleinthe67boilwateroneflyingintheairandonejustbeingcut. Thenoodlesareusuallyservedinasmallbowlmixed68freshvegetables.AsaspecialrefinementyoucanputsomeShanxivinegarontop.Theextraagedvinegarisatypicalproductoftheregionaswell. OnecanfindhandmadenoodlesalloverChinatoday69Shanxiprovinceisspecial.It's70theartofnoodle﹣makingreacheditstop.

两个不同的自然数相乘所得的积一定是合数．．判断对错

OneafternoonI'dbeendrivingdownthefreewaywhenIspottedwhatlookedlikeastalled熄火的car.I41thatothercarshadslowedinordertobrieflylookatthestalledcar.Idecidedto42behindthecarandfindoutwhatwasgoingon.Suddenlyan43womanstepsoutandsheappearstobeinpain.IapproachedthewomanaskingifIcan44.ShesaidPleasecallmyhusband.Iamtryingtogettothe45.Iamabouttogivebirth!46asIwasIsaidWehaveno47forthat.Quick!GetinmycarandIwill48you. Itriedtodrivebothquicklyandsteadily49mypassengerwouldnotmovearoundalot.Ialsotriedofferinga50talkonthewaylikeEverything'sgoingtobeok.andWe'realmostthere.51wemetnoobstacleallthewayandarrivedatthehospitalinnotime.Itseemedabit52toanswerthestaff'squestionsabouthersincewe'djustmetafewminutesbeforeandIknew53aboutheroutsideofhername. 15minuteslaterher54cameoutofbreath.Uponseeingmehethankedmeandhandedmea$100bill.AtthatmomentI'd55theSMILEcardinmyglovebox.Iwalkedoutand56withittotheroomwherethewomanhadbeensettled.ItoldherthatithappenedthatIhadsomething57happentomewhenmysecondchildwasbornandwehadagoodlaughoverthe58. OnthewayoutI'daskeda59togivethecoupleanenvelopewiththeSMILEcard.Its60includedthe$100billwithanotethatreadBaby'scollegefund.Whew!Whataday. 41.A.expected B.noticed C.admitted D.knew 42.A.pullup B.pullin C.speedup D.joinin 43.A.lazy B.single C.injured D.pregnant 44.A.help B.stop C.leave D.pass 45.A.office B.car C.hospital D.store 46.A.Excited B.Puzzled C.Shocked D.Disappointed 47.A.excuse B.time C.need D.money 48.A.treat B.call C.send D.take 49.A.incase B.sothat C.evenif D.asthough 50.A.positive B.direct C.ridiculous D.negative 51.A.Naturally B.Undoubtedly C.Eventually D.Fortunately 52.A.complex B.vital C.difficult D.easy 53.A.nothing B.everything C.something D.anything 54.A.friend B.husband C.mother D.child 55.A.bought B.made C.forgotten D.remembered 56.A.posted B.designed C.returned D.brought 57.A.controversial B.crazy C.strange D.similar 58.A.child B.disaster C.story D.news 59.A.assistant B.nurse C.waitress D.policeman 60.A.objects B.projects C.themes D.contents

中东呼吸综合征__MERS﹣CoV可引起人体严重的呼吸系统症状甚至造成死亡．科研人员为研制针对MERS﹣CoV的特异性治疗药物进行了系列研究． 1MERS﹣CoV主要通过其表面囊膜的S蛋白与宿主细胞膜受体DPP4结合来感染宿主细胞．如图1所示S1与DPP4结合后导致S1和S2分离S2的顶端插入到宿主细胞膜上通过S2蛋白的改变从而将两个膜拉近发生膜融合过程．MERS﹣CoV进入宿主细胞后利用宿主细胞内的等为原料合成大分子物质组装成新的病毒扩散并侵染健康细胞． 2RBD是MERS﹣CoV的S1上与DPP4结合的部分．科研人员用从康复者体内筛选出的三种抗体甲乙丙进行实验研究它们与RBD的特异性结合能力．另用抗体丁作为对照抗体．实验流程如图2所示结果如图3．在实验过程中将作为抗原固定分别将加入反应体系然后加入酶标记的抗体能与待检抗体结合携带的酶可使底物反应显色其后加入底物显色检测相应的吸光值颜色越深吸光值越高．该实验中抗体丁可以作为对照抗体的理由是．实验结果表明． 3研究发现MERS﹣CoV在感染宿主细胞后有一种更快速的病毒传播方式．当被感染细胞表面的MERS﹣CoV囊膜蛋白与健康细胞表面的DPP4结合后膜发生融合实现MERS﹣CoV的转移．为了探究三种抗体能否抑制MERS﹣CoV在被感染细胞和健康细胞之间的传播科研人员展开研究．请在下表中的空白处填写相应处理内容完成实验方案．注鼠DPP4与人DPP4存在结构和序列上的差异 实验结果说明三种抗体中甲可以阻断病毒通过细胞融合的途径进行传播乙和丙效果不明显． 4科研人员进一步利用多种方法深入研究了三种抗体与RBD结合的区域实验结果表明甲与乙结合RBD上不同的区域甲与丙结合RBD的区域部分重叠．综合以上系列研究结果研究人员推测将两种抗体联合使用会具有更强的抗病毒能力．如果希望用联合抗体治疗中东呼吸综合征患者还需要进行哪些方面的研究写出一个方面即可．

某书店运来一批儿童读物第一天卖了这批读物的30%第二天卖了这批读物的36%比第一天多卖了30本．书店运来的这批儿童读物一共有多少本列方程解答

长方体中除了相对的面完全相同也有可能有两个相邻的面完全相同．判断对错

成都到重庆的实际距离大约为340千米在一幅比例尺为12000000的地图上量得的图上距离是厘米．

一种童装原价每套120元现价为96元打了

甲与乙的工作效率比是65两人合做一批零件共计880个乙比甲少做

微生物燃料电池的一种重要应用就是废水处理中实现碳氮联合转化为CO2和N2如图所示12为厌氧微生物电极3为阳离子交换膜4为好氧微生物反应器．下列有关叙述错误的是

已知a比b多25%那么ab的最简比是．

一个立体图形从上面看到从左面看到．搭出这样的立体图形最少需要个正方体最多可以有个正方体．

油菜花是两性花其雄性不育性状不能产生可育的花粉受两对独立遗传的等位基因控制其中m基因控制雄性不育性状r基因会抑制m基因的表达．下列叙述正确的是

1分Thefirstthingyoumustrememberisthatinordertosucceeditisalmostcompulsorythatyouoptimistic. A.be B.are C.mustbe D.havebeen

在退耕还草后的15年里青藏高原的高寒干旱草甸发生从草本阶段到灌木阶段的演替．以下有关叙述正确的是

8分Sleepdeprivation缺失isanimportanthiddenfactorinloweringtheachievementofschoolpupilsaccordingtoresearcherscarryingoutinternationaleducationtests. Itisaparticularprobleminrichercountrieswithsleepexpertslinkingittotheuseofmobilephonesandcomputersinbedroomlateatnight.Sleepdeprivationissuchaseriousproblemthatlessonshavetobedraggeddowntoalowerleveltosuitsleep﹣deprivedlearnersthestudyfound.TheinternationalcomparisoncarriedoutbyBostonCollegefoundtheUnitedStatestohavethehighestnumberofsleep﹣deprivedstudentswith73%of9﹣and10﹣year﹣oldsand80%of13﹣and14﹣year﹣oldsidentifiedbytheirteachersasbeingnegativelyaffected. Inliteracy读写能力teststherewere76%of9﹣and10﹣year﹣oldslackingsleep.Thiswasmuchhigherthantheinternationalaverageof47%ofprimarypupilsneedingmoresleepand57%amongthesecondaryagegroup. Othercountrieswiththemostsleep﹣deprivedyoungsterswereNewZealandSaudiArabiaAustraliaEnglandIrelandandFrance.High﹣performingFinlandisalsoamongthemostlackinginsleep.CountrieswiththebestrecordsforgettingenoughsleepincludeAzerbaijanKazakhstanPortugaltheCzechRepublicJapanandMalta. Theanalysiswaspartofthehugedate﹣gatheringprocessforglobaleducationrankingstheTrendsinInternationalMathematicsandScienceStudyTIMSSandProgressinInternationalReadingLiteracyStudyPIRLS Ithinkweunderestimatetheimpactofsleep.Ourdatashowthatacrosscountriesinternationallyonaveragechildrenwhohavemoresleepachievehigherinmathsscienceandreading.ThatisexactlywhatourdatashowsaysChadMinnichoftheTIMSSandPIRLSInternationalStudyCenter. It'sthesamelinkforchildrenwhoarelackingbasicnutritionsaysMrMinnichbasedattheLynchSchoolofEducationBostonCollege.Ifyouareunabletoconcentratetoattendmentallyyouareunabletoachieveatyourbestlevelbecauseyourmindandbodyareinneedofsomethingmorebasic.Sleepisafundamentalneedforallchildren.Ifteachersreportsuchlargeproportionsofchildrensufferingfromlackofsleepit'shavingasignificantimpact.Butworsethanthatteachersarehavingtoadjusttheirinstructionbasedonthosechildrenwhoaresufferingfromalackofsleep.Thechildrenwhoaresufferingfromalackofsleeparedrivingdowninstruction. Thatmeansthateventhechildrenwhoaregettingenoughsleeparestillsufferingfromthissleep﹣relatedlowering. 1WhatdidtheresearchersofBostonCollegetrytofind A.Whychildrendon'tgetenoughsleep B.Howmanyhourschildrensleepeverynight C.Therelationshipbetweensleepandtestresults D.Therelationshipbetweensleepandhealth 2Manychildrensufferfromsleepdeprivationbecause. A.theysitinfrontoftheTVfortoolong B.theycanhardlysleepsoundlyanddeeply C.theirhomeworkoccupiestoomuchoftheirtime D.moderntechnologicaldevicesconsumealotoftheirtime 3Whichofthefollowingcountrieshasthemostsleep﹣deprivedstudents A.Japan B.Malta C.Finland D.Portugal 4Whyarechildrenwhogetenoughsleepalsovictims A.Becausetheyaredisturbedbysleep﹣deprivedstudents B.Becauseteachingisdrivendownbysleep﹣deprivedstudents C.Becausetheyhavetospendtimehelpingsleep﹣deprivedstudents D.Becausetheteacherswastetimediscipliningsleep﹣deprivedstudents

当呼吸道黏膜受到机械刺激或化学刺激后产生的兴奋传到延髓的相关中枢进而引起呼吸肌快速收缩或舒张产生咳嗽反射．下列有关该过程的叙述正确的是

Smokingissoharmfultopersonalhealththatitkills______peopleeachyearthanautomobileaccidents. A.sevenmoretimes  B.seventimesmore  C.morethanseventimes  D.seventimesasmany

甲和乙为某二倍体动物2N＝8精巢内精细胞形成过程中的两个细胞两个细胞中染色体都在拉向两极且染色体染色单体和核DNA数目如表所示下列叙述正确的是

下面4个关系式中x和y成反比例关系的是

生物兴趣小组自制了泡菜对其中的微生物进行了筛选并对有害物质的含量进行了测定请回答相关问题 l泡菜制作过程中乳酸发酵的过程即为乳酸菌进行的过程．乳酸菌中含有多种蛋白质利用凝胶色谱法分离提取到的部分乳酸菌蛋白质时等样品完全进入凝胶层后加入pH为7.0浓度为20mmol/L的到适当高度进行洗脱结果先洗脱出来的是的蛋白质． 2兴趣小组还用伊红美蓝培养基检测泡菜汁中大肠杆菌的含量．从物理性质看该培养基属于液体/固体培养基伊红美蓝对大肠杆菌起到选择/鉴别作用．在某次计数操作过程中发现培养基上的菌落连成一片为避免此种现象发生正确的操作方法是． 3培养大肠杆菌时在接种前通常需要检测培养基是否被污染检测方法是． 4测定泡菜中NaNO2的含量依据的原理是在条件下亚硝酸盐与对氨基苯磺酸发生重氮化反应后与N﹣1﹣萘基乙二胺盐酸盐结合形成色染料．

一个长方形的面积是56.7平方厘米已知长是10厘米宽是多少厘米

马边矿产资源丰富．已探明的矿藏有磷石膏煤铅锌铜铁等15种矿产．其中查明资源储量的有磷煤石膏石英砂岩石灰岩重晶石粘土铅锌铜铁等102余种．尤以磷矿最为丰富储量24.76亿吨．国家已将马边磷矿列入攀西﹣六盘水国土规划金沙江下游国土综合开发规划川南国土开发规划和马边河流域国土综合开发规划被四川省定为全省第二磷矿基地． 1在下列物质中既是煤的燃烧产物又会与空气中的水蒸汽形成酸雨的是 ①二氧化硫②粉尘③二氧化氮④臭氧⑤一氧化碳 2磷在氧气中燃烧发光放热产生大量的白烟．其白烟主要成分是五氧化二磷请写出五氧化二磷中磷元素的化合价为 3写出用一氧化碳和赤铁矿炼铁的化学方程式 4矿物的储量有限而且不能再生．防止金属的腐蚀是爱护金属资源的一种重要途径．实验室可用盐酸除铁锈其化学方程式为 5将一定量的金属锌放入盛有氯化铜和氯化亚铁的混合溶液烧杯中待反应后过滤得到滤渣和滤液往滤渣中滴加盐酸有气泡产生则滤液中一定不含溶质是

1分﹣I'dlikeJohnsontotakethejob. ﹣Heis.Betternotaddtohisworkload. A.outofplace B.outoforder  C.outofshape D.outofquestion

如图是某海域的大黄鱼种群数量与增长速率的关系曲线图ab点对应的死亡率相差不大下列叙述错误的是

计算 3m+5m＝ 8x﹣2x＝

阿特拉津简称AT是一种广泛使用的除草剂因为溶解性好迁移率高残留期长容易引起土壤污染进而对人体健康造成严重危害．分离和固定化AT降解菌可有效修复AT污染的土壤．请回答下列问题 1应从的土壤中取样可以通过培养增加AT降解菌的浓度以确保从土壤样品中分离到所需要的AT降解菌．为了确定得到的是AT降解菌还需要进行产AT降解酶的实验． 2若固定AT降解菌中的粗提取酶不宜采用包埋法的原因是酶分子． 3若直接固定AT降解菌与固定化酶比较从操作角度考虑的优点是答出两点． 4制备具有吸附和降解功能的固定化AT降解菌制剂的方法步骤是①制备多孔性生物碳材料并制成悬浊液．②培养AT降解菌并制成菌悬液．③悬浊液菌悬液和包埋剂混合再加入到某溶液中得到凝胶珠．④清洗凝胶珠． 若用海藻酸钠做包埋剂溶化时最好采用加热的方法③中的某溶液是指溶液．AT降解菌制剂中具有吸附功能的是．

求未知数x． 2x﹣4.6＝34.6 x＝4 x+x＝

兴农种子公司用350粒种子做发芽实验其中有50粒种子没有发芽．兴农种子公司这批种子的发芽率是

洋葱表皮细胞在0.3g/mL的蔗糖溶液中发生质壁分离时吸水力随质壁分离程度变化的曲线如图．下列叙述错误的是

下面百分率可能大于100%的是

Fordecadesarchaeologistshavewondered:Whoorwhatkilledthemostfamousboykinginhistory?Someexpertsthoughtthat19﹣year﹣oldTutankhamenhaddiedinahuntingaccident.Otherssaidthathewasmurderedbyablowofthehead. TwoyearsofDNAtestingandCTscansmayhavefinallysolvedthemysteryofTut'sdeath.Theteenpharaoh法老scientistsinEgyptnowbelievewasthevictimofmalaria疟疾complicatedbyabonedisorder. EvenathisbestKingTutwasnosymbolofstrength.HewasaweakboywhohadadeformedfootandwhoneededasticktowalkresearcherCarstenPuschtoldNationalGeographic. ShortlybeforeTutdiedinabout1324B.C.hemayhavebrokenhisleginafallthestudy'sauthorssay.Becauseofaweakimmunesystemthepharaoh'slegcouldn'thealandamalarialinfection感染finishedhimoff. Tutwasforgottensoonafterhisdeath.Sowhydoesheattractustoday?In1922anarchaeologistuncoveredagroupofroyaltombsinEgypt'sValleyoftheKings.Thieveshadstolenmostofthegraves. OnlyTut'swasuntouched.Egyptfeverswepttheglobeasworkersunloadedthedazzlingtreasureshiddenformorethan3200yearswhichhadbeenmeanttoaccompanytheyoungpharaohtotheafterlife.In1972Tut'streasuresbeganaseriesoftoursaroundtheworldgivingmillionsofpeopleachancetoviewhisgoldenburialmaskandotherrelicsupclose. ThroughitallTut'sstarwillcontinuetoburnbrightexpertssay.AsauthorJonManchipWhitewroteThePharaohwhoinlifewasoneoftheleastrespectedofEgypt'skingshasbecomeindeaththemostfamous. 1WhatprobablyledtoTutankhamen'sdeathaccordingtotheneweststudy? A.Ahuntingaccident. B.Aterriblemurder. C.Aninfectiousdisease. D.Ablowonhishead. 2Whichwordbestdescribestheboyking'sbody? A.Disabled. B.Over﹣weighted. C.Healthy. D.Strong. 3WhyhasthePharaohbecomesowell﹣knownafterhisdeath? A.Becausehediedattheageof19. B.Becausehisgravehadbeenstolenbythieves. C.Becausehewasoneoftherespectablekingsinlife. D.Becausetreasuresuncoveredinhistombattractedtheworld. 4Whichofthefollowingmayserveasthebesttitleforthetext? A.TheMostFamousPharaohinEgypt. B.TheCauseofTutankhamen'sDeath. C.AnIntroductiontoValleyoftheKings. D.TutankhamenCametoLifeafterDeath.

下列关于科学研究方法和相关实验的叙述中不正确的是

在适宜温度和大气CO2浓度条件下测得某森林中林冠层四种主要乔木的幼苗叶片的生理指标见下表．下列分析正确的是 光补偿点光合速率等于呼吸速率时的光强光饱和点达到最大光合速率所需的最小光强