音乐会上，演员正在演奏二胡，二胡发声是因为琴弦在　 　，演奏过程中，演员不断调整手指在琴弦上的按压位置是为了改变声音的　 　．

30分Onlineshoppingiscomingintofashioninmostcitieswherepeopleareabletomakefulluseofthe1developedInternettechnology.Undoubtedlyshoppingonlineisidentifiedasaconvenienttime﹣savingandmoney﹣savingwayofbuyingthinglocallyandglobally.Apparentlyshoppingonlineisaconvenienttime﹣savingandmoney﹣savingwayofbuyingthings.Thusmoreandmoreshoppersarebuyingthingsonlinethesedaysallowingthemtoavoid2salespeopleandlonglinesatcheckoutcounters.Inspiteofonlineconvenience.3therearesomeitems﹣likeclothes﹣thatcustomerspreferto4beforebuying.Inlightofthistwocompaniesarefindingwaystomodernizestoresand5thegapbetweenonlineandin﹣storeretail零售.AsoftwarecompanythatalsohappenstoselldesignerjeansHointerhascreatedafastandpainlessshopping6foritscustomers.ShopperswalkintoaHointerstoreandselectoneofthemanypairsofjeans7downfrombars.Thentheypointtheirsmartphonesatthetagand8theHointerappafterwhichtheyselectthesizeandpresstryon.Theappthendirectsthemtoa9dressingroom.German﹣maderobotsbringoutthe10jeansanddeliverthemthroughachute斜槽tothedressingroominabout30seconds.Immediatelyafter11pairsofjeansaredroppedthroughanotherchutetheoutboxtheydisappearfromthelistintheapp.PurchasesatHointeraremadewithaswipe刷卡ofacreditcard.And12withasalespersonisoptional!ThisallowsHointertohirefewerpeopleandfocusontheireventualgoal:developing13thatsupportsaretailrevolution.Men'sclothingretailerBonoboshas14amorepersonalizedshoppingexperience.Althoughitis﹣infact﹣anonlineretailerBonoboshasdecidedtoopenahandfulofbrick﹣and﹣mortarstorescalledGuideshops.Shoppersmakean15onlinebeforearrivingataGuideshopwheretheyreceiveone﹣on﹣one16fromafittingguide.Becausetheseshopshavelimitedinventories存货shoppersaren'tabletotakehomethesuitstheyselect.Butguideshelpshoppersmakeonline17beforetheyleaveafterwhichtheitemswillbe18tocustomersinoneortwodays.19HointerfocusesonconvenienceBonobosGuideshopsfocusoncustomerservice.Butbotheffortshaveonething20:givingclothingretailersanewlookforthe21stcentury.1A.fundamentally B.rapidly C.instantly D.precisely2A.respectable B.considerate C.aggressive D.violent3A.however B.therefore C.anyway D.moreover4A.convince B.guarantee C.ensure D.examine5A.break B.bridge C.shallow D.deepen6A.experience B.mall C.direction D.principle7A.hiding B.hanging C.storing D.labeling8A.start B.upload C.save D.download9A.complicated B.available C.sufficient D.specific10A.desired B.well﹣designed C.promoted D.well﹣prepared11A.qualified B.wanted C.chosen D.unwanted12A.interviewing B.interacting C.conveying D.interpreting13A.employment B.efficiency C.technology D.market14A.comeupwith B.lookedforwardto C.lookedup D.broughtup15A.decision B.appointment C.contribution D.impression16A.contact B.instruction C.notice D.attention17A.bargains B.sales C.purchases D.remarks18A.presented B.packaged C.delivered D.transferred19A.If B.While C.Since D.transferred20A.inconclusion B.incommon C.asusual D.ingeneral

一个直角三角形中已知一个锐角与直角的度数比是35那么两个锐角的度数比是

下列关于ATP的叙述正确的是

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．

1分﹣﹣﹣Iwenttoseeyouyesterdayevening.Butyouweren'tin.Wherewereyouthen? ﹣﹣﹣Iawalkbythelakewithmyfather. A.washaving B.amhaving C.havehad

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．

春节小刚给弟弟买了一个如图所示的电动小汽车里面主要的部件是电动机．电动机的工作原理是该电动机的电压由4节干电池提供通过的额定电流为1A电动机线圈电阻为0.5Ω则小汽车正常工作2分钟消耗的电能为J输出的机械能是J．

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．

2分阅读小题根据汉语提示完成句子;每空一词. 请帮我开一下电脑好吗?我要发一封邮件. Wouldyoupleasethecomputer?Ineedtosendanemail.

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

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.

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

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

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

10分读下面有关一个学生的问题的文章在每个题目下做简短的笔记 DearMr.Hunt MyproblemisthatIcan'tgetonwithmyfamily.Relationsbetweenmyparentshavebecomedifficult.TheyfightalotandIreallydon'tlikeit.It'stheonlycommunicationtheyhave.IdontknowifIshouldsayanythingtothemaboutthis.Whentheyargueit'slikeabigblackcloudhangingoverourhome.Alsomyelderbrotherisnotverynicetome.HealwaysrefusestoletmewatchmyfavoriteTVshow.Insteadhewatcheswhateverhewantsuntillateatnight.Idon'tthinkthisisfairAthomeIalwaysfeellonelyandnervous.Isthatnormal?WhatcanIdo? SadandThirteen DearSadandThirteen It'snoteasybeingyourageandit'snorthesefeelings.Whydon'tyoutalkaboutthesefeelingswithyourfamily?Ifyourparentsarehavingproblemsyoushouldoffertohelp.Maybeyoucoulddomorejobsaroundthehousesothattheyhavemoretimeforpropercommunication.Secondlywhydon'tyousitdownandcommunicatewithyourbrother?Youshouldexplainthatyoudon'tmindhimwatchingTVallthetime.HoweverheshouldletyouwatchyourfavoriteshowIhopethingswillbebetterforyousoon. Mr.Hunt 1①Thewriter'smainproblem: ②Thewriter'sproblemabouthis/herparents: 2①Thewriter'sproblemabouthis/herbrother: ②Thewriter'sproblemabouthimself/herself: 3TheadvicethatMr.Huntgivesabouthis/herproblemwithhis/herbrother: 4PleasefindthesentenceinthepassagethathasthesamemeaningasHedoesn'talwaysallowmetowatchtheTVprogramIlikebest.请在本文中找与划线句子意思相同的句子 5Thelanguagegoals语言目标ofthispassage:

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．

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.

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.

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

长方体的表面中不可能有正方形．．判断对错

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

1分Iwillhaveameetingthisafternoon.Please唤醒meupat2:00pm.

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

20分为了让学生吃到更加营养安全的食品政府出台了陪餐制要求从4月1日起学校领导陪同学生用餐.请你根据以下要点给校报英语专栏写一篇短文谈谈自己的看法. 1学生吃得健康安全; 2及时发现就餐问题; 3食堂提供食品多样; 4父母更加放心. 注意:1词数80词左右;开头已给出不计入总词数; 2可适当增加细节以使行文连贯; 3参考词汇:规定regulationn.;食堂cafeterian.;营养的nutritiousadj. AnewfoodsafetyregulationwasputintouseonApril1toimprovenutritionandfoodsafetyinschools.Itaskstheschoolmanagerstoeatwithstudentsintheircafeterias.﹣﹣﹣﹣ ﹣﹣﹣﹣ ﹣﹣﹣﹣ ﹣﹣﹣﹣

在个体生长发育过程中引起细胞种类增加的是

下列有关现代生物进化理论的叙述错误的是

8分Aswegrowoldwerealizethatwehavesolittletimetoreadandtherearesomanygreatbooksthatwe'veyettogetaroundto.Yetre﹣readersareeverywherearoundus.Forcertainfansre﹣readingTheLordoftheRingsisaconventionalpracticeannually.OnefriendtoldmethatJaneAusten'sEmmacanstillsurprisehimdespitehishavingreaditover50times. Newsuddenclearunderstandingscanbegainedfromtheprocessofre﹣reading.JournalistRebaccaMeadalong﹣timeEnglishwomaninNewYorkfirstcameacrossGeorgeEliot'sMiddlemarchat17.Sincethenshehasreaditagaineveryfiveyears.Witheachre﹣readingithasopenedupfurther;ineachchapterofherlifeithasresonated引起共鸣differently.Meadevidencedthelargenumberofwaysinwhichreallygoodbooksnotonlystandthetestofrepeatreadsbutalsoofferfreshgiftseachtimewecracktheirspines.Thesekindsofbooksgrowwithus. Scientistshavealsorecognizedthementalhealthbenefitsofre﹣reading.ResearchconductedwithreadersintheUSfoundthatonourfirstreadingweareconcernedwiththewhatandthewhy.Secondtimeroundwe'reabletobetterappreciatetheemotionsthattheplotcontinuestoexpress.AsresearcherCristelRusselloftheAmericanUniversityexplainedreturningtoabookbringsneworrenewedappreciationofboththegreatbookanditsreaders. It'struethatweoftenfindformerselvesonthepagesofoldbooksifwe'refondofmakingnotesonthepages.Thesetextscancarryusbacktoatimeandplaceandremindusofthekindofpersonthatwewerethen.We'rechangednotonlybylivedexperiencebutalsobyreadexperience﹣bythebooksthatwe'vediscoveredsincelastreadingtheoneinourhand. Moresothanthemoviedirectororthemusicianthewritercallsuponourimaginationsusingwordstoleadustopicturethisdeclarationofloveorthatunfaithfulnessinlife.Abookisajointprojectbetweenwritersandreadersandwemustpoursomuchofourselvesintoreadingthatourownlifestorycanbecomeconnectedwiththestoryinthebook. Perhapswhat'sreallystrangeisthatwedon'tre﹣readmoreoften.Afterallwewatchourfavouritefilmsagainandwewouldn'tthinkoflisteningtoanalbumonlyonce.Wetreasuremessyoldpaintingsasobjectsyetofallartformsliteraturealoneisalargelyone﹣timedelight.AbookofcoursetakesupmoretimebutasMeadconfirmstherewardsmakeitadequatelyworthwhile. 1ThetwobooksarementionedinParagraph1mainlyto. A.attracttheattentionofreaders B.introducethetopicofthepassage C.providesomebackgroundinformation D.showthesimilaritybetweenre﹣readers 2TheunderlinedexpressioncracktheirspinesinParagraph2refersto. A.recitethem B.re﹣readthem C.recallthem D.retellthem 3Itcanbelearnedfromthepassagethat. A.readingbenefitspeoplebothmentallyandphysically B.readersmainlyfocusonfeelingsontheirfirstreading C.weknowourselvesbetterthroughre﹣readingexperience D.writersinspirethesameimaginationsasfilmdirectorsdo 4Thepurposeofthepassageisto. A.callondifferentunderstandingsofoldbooks B.focusonthementalhealthbenefitsofreading C.bringawarenesstothesignificanceofre﹣reading D.introducetheeffectivewaysofre﹣readingoldbooks

小红家的新房装修在厕所里安装了带有排风扇的照明灯灯和排风扇都可以单独工作且排风扇有两个档位可以调整排风的强度下列电路符合要求的是

1分根据下列句子的句意汉语提示或英语解释写出空白处所缺单词的正确形式;每空一词. Theworld'slongestcross﹣seabridge﹣theHongKong﹣Zhuhai﹣MacaoBridgeisconsideredasoneoftheseven奇迹ofthemodernworldbysomepeople.

10分第一节语法填空 阅读下面材料并填空有的答案要填入适当的内容有的答案要用括号内单词的正确形式但每个答案不多于3个单词. Oneoftheworld'smostdangeroussportsismountainclimbingandoneofthe1popularplacesforthisistheHimalayas.TheHimalayas2runalongthesouthwesternpartofChina. OfallthemountainsQomolangmarisesthehighestandisthemostfamous.3is8844.43metershighandsoisvery4dangertoclimb.Itisveryhardtotakeinairasyougetnearthetop. ThefirstChineseteam5reachthetopin1960while6firstwomantosucceedwasJunkoTaibeifromJapanin1975. Whydosomanyclimbersrisktheirlives?Oneofthemain7reasonisthatpeoplewanttochallengethemselves8ofdifficultiesThespiritoftheseclimbersshowsusthatweshouldnevergiveup9trytoachieveourdreams.Italsoshowsthathumans10bestrongerthantheforcesofnatureinsomesituations

2分阅读小题根据汉语提示完成句子;每空一词. Readthebookcarefullyandyouwillnotmakemistakes.改为同义句 readthebookcarefullyyouwillnotmakemistakes.

找规律．下列图中有大小不同的平行四边形第1幅图中有1个第2幅图中有3个第3幅图中有5个则第5幅图中有个第n幅图中有个．

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

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．

8分Thehousewasquietat5amandTim'smotherwasasleep.Onlythesoundofthebigfreezerbrokethequiet.He'ddreamtofthecavelastnight.Thepurring轻微颤动声ofthefreezerhadbeenthesea.Timpulledonasweaterandputsomeapplesintohisschoolbag.Itwastooearlyforbreakfast.He'deatafterhe'dbeenthroughthecavesittingontherocksandstaringatthesea.Hewishedhehadaproperpack.Hisschoolbagwouldhavetodo.WhatelseSandwiches﹣buthismothermightwakeupifhestartedpullingoutbreadforsandwichesshe'dwanttoknowwhyhehadtoleavesoearly.Hesettledforsomebiscuitsandleftanotestucktothetable:GonetoMichael's.BacktonightTim.Theskywashighandsoftandlightoutsidethoughthesunstillwasn'tup.Eventhehighwayupthehillwasquietashemadehiswaydownthestreet.Thewindfromtheseawasfreshandsweet.Thesandhillsstillbreathedheatfromyesterday'ssunthoughthetopofthesandwascool.Herandowntothebeachimpatientlybuttherewasnoonejustdrysanddancingintheearlywindandseabirdsmarchingupanddownwatchingthewaves.Thelightchangedsuddenly.Thefirstraysofsunlightstretchedacrossthesea.Thesunwaspushingitswayovertheedgeoftheworld.OverthefirstrocksalongtothepointTimglancedback.Thebeachwasstillempty.Thesunsailedhigherinthesky.Hecouldseethecavenowevendarkerinthemorninglight.Thesandturnedsilverthendarkgoldasthewaterflowedawayfromit.Hehadtoforcehimselftogocloser.WhywasitsomuchmoremysteriousnowButitwouldbesillytogobacknowaftersomuchtrouble.Heneedn'tgoinalltheway1WhatdidTimdoatthebeginningofthestoryA.Heputasweaterinhisschoolbag.B.Hehadbreakfastathome.C.Heleftanoteonthefreezer.D.Heleftthehousequietly.2WhatmadeitpossibleforTimtoseetheentrytothecaveA.Theheightofthefirstrocks.B.Thechangeinthepositionofthesun.C.Theupsanddownsofthewaves.D.Thevaststretchofthesunlitbeach.3WhichofthefollowingstatementsisTRUEaccordingtothestoryA.Timwastheonlypersononthebeach.B.SeabirdsflewawaywhenTimarrived.C.Thesealookedlikeapieceofgold.D.TheskygotdarkasTimreachedthecave.4InthestoryTim'smoodchangedfrom.A.lonelinesstocrazinessB.anxiousnesstoexcitementC.eagernesstonervousnessD.helplessnesstohappiness

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

8分Conventionalwisdomisamajorbarriertoinnovation创新thatthreatensthesurvivalofcompanieseverywhere.It'sbasedontheassumptionthatoldideaswillalwaysworksotheyshouldn'tbechallenged.Whilethismaybeavalidassumptioninsituationsthatdon'tchangeit'sunlikelytoholdtrueinachangingsituation.Intoday'srapidchangingglobalenvironmentoldmethodsoftendon'tworkandstubbornlyusingthemcanleadtomajorproblems. Mostpeopleseemtoagreewithconventionalwisdombecauseitgivesoneafalsesenseofsecurity.Ifeveryoneelsebelievesitthenitmustbetree.Individualswhouseconventionalwisdomarecertainthattheyarerightandbeingfightisgood.Theywanttocontinueusingoldideasratherthantakeriskswithchangesthatmightnotwork.In1977KenOlsenco﹣founderandCEOofDigitalEquipmentCorporationDECstatedThereisnoreasonforanyindividualtohaveacomputerinhishome.DespitebeingadominantleaderinthecomputerindustryDECnolongerexists. Peopleseemtoforgetthatsinceinnovationisachangetherecanbenoinnovationwithoutchange.Unfortunatelyconventionalwisdompreventsleadersfollowersandcompaniesfromchangingandthereforeinnovating.Ifcompaniesdon'tinnovatebuttheircompetitorsdothefutureislikelytobeproblematic.Breakingfromconventionalwisdomhasledtomanyofthemostinnovativecompaniesandproductsinhistoryacrossmanyindustriessoithasapowerfuleffectonbusinesssuccess. TedTurnerfounderofCNNknewlittleifanythingaboutthenewsbusinessbutheknewitwasinconvenienttowatchnewsonlyatthedinnerhouraswascommonbeforeCNN.Turner'ssolutionwastocreateacable有线的channeldevotedtonews24hoursaday.Thenewsestablishmentreflectedconventionalwisdomatthetimeandpredictedhisideawouldfailbecausenoonewantedtowatchthenewsallday.Howeveritdoesn'ttakearocketscientisttounderstandthatviewersdon'thavetowatchthenewsalldayfortheCNNtowork.Viewersjusthavetowatchwhentheywanttogetinformation.DuetoconventionalthinkingthecriticsfailedtorecognizetheopportunitythatwascleartoTed.Theyassumedthatonlywhatwasfamiliartothemcouldworkinthefuture. Conventionalwisdompreventscreativityflexibilityandrisk﹣takingsounconventionalleadersenthusiasticallybreakfromit.Tosurviveboomandmaintaincompetitiveadvantagecompaniesmustbeflexiblewhenreactingtochange. 1DEChasdisappearedprobablybecause. A.theCEOstucktotheconventionalideas B.theconsumersdidn'tlikeitsproducts C.theleaderslackedthesenseofsecurity D.theemployeestookmanyriskswithchanges 2ThefoundingofCNNisusedasanexampletoprove. A.missingopportunitiescouldleadtofailure B.watchingnewsatthedinnerhourisconvenient C.changingcouldcontributetobusinesssuccess D.conventionalwisdominfluencesbusinesssuccess 3Whatdoestheunderlinedpartprobablymean. A.RocketscientistscanensuretheCNNworksproperly. B.It'seasytoknowpeopleneedn'twatchthenewsallthetime. C.It'snecessarytounderstandwhenpeoplewatchthenews. D.Mostoftheviewersdon'tliketowatchthenewsatwork. 4Thepassageismainlywrittentotellusthat. A.oldmethodsarechangingwithtime B.opportunitiesleadtobusinesssuccess C.successfulcompaniesneedwiseleaders D.conventionalwisdomlimitsinnovation

1分﹣﹣﹣WhatshouldIdodoctor? ﹣﹣﹣healthyyoushouldtakemoreexercise. A.Keep B.Keeping C.Tokeep

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．

8分IwasverydisappointednottobeabletogotothejazzconcertlastFriday.TheadvertisementinthepapersaidthatyoucouldbuyticketsatthetheatreboxinRichlandHillsanydaybetween10:00and4:00.SinceIworkfrom9:00to5:30theonlytimeIcouldgotothetheatrewasduringmy45﹣minutelunchbreak. UnfortunatelythetheatreisontheothersideofthetownandthebusservicebetweenmyofficeandRichlandHillsisnotverygood.Butifyouareluckyyoucanmaketheroundtripin45minutes.LastMonday.Istoodatthebusstopfor15minuteswaitingforthebusBythetimeIsawonecomearoundthecornertherewasnotenoughtimelefttomakethetrip. SoIgaveupandwentbacktotheoffice.ThesamethinghappenedonTuesdayandagainnextday.OnThursdaymyluckchanged.Igotonabusrightawayandarrivedatthetheatreinexactly20minutes.WhenIgottherehoweverIfoundalonglineofpeopleattheboxofficeIheardonemansayhehadbeenwaitinginlineforoveranhour.RealizingIwouldnothaveenoughtimetowaitinline.Icaughtthenextbusandheadedbackacrossthetown. ByFridayIrealizedmyonlyhopewastomakethetripbytaxiitwasexpensivebutIfeltitwouldbeworthittoheartheconcert.Thetripbytaxionlytook10minutesbutfeltlikeanhourtome.WhenIgottothetheatreIwasrelievedtoseethatnobodywaswaitinginline.ThereasonhoweverIquicklydiscoveredwasthattheyhadalreadysoldallthetickets. 1ThemanlearnedthattherewouldbeaconcertlastFriday. A.fromthenewspaper B.fromhisfriends C.fromoneofhiswork﹣mates D.overtheradio 2Hetriedtogotothetheatreeverydaybutmanagedtogetthereonly. A.once B.threetimes C.twice D.fourtimes 3Onedaythemantooktogettothetheatrebybus. A.forty﹣fiveminutes B.fifteenminutes C.overanhour D.justtwentyminutes 4Theunderlinedwordrelievedmaybestbereplacedby. A.surprised B.puzzled C.pleased D.sorry

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．

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．

如图所示练功房一侧的墙壁是用平面镜MN装饰的若光源A发出一束光经过平面镜反射后正好射到房顶的B点请画出这束光线的光路图．

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.

1分Ihaven't收到来信fromSallybefore.

25分假定你校正在开展根除陋习创建文明校园活动.请你以此为主题用英语写一篇发言稿向全校学生倡议: 1.根除:乱扔垃圾浪费食物吸烟2.提倡:讲礼貌互助 Dearfriends Asisknowntoallourschoolhaslaunchedacampaignagainstbadhabitsinordertobuildacivilizedcampus. That'sall.Thankyou.

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

10分当前许多学生在课外沉溺于智能手机smartphones.针对这一现象学校将组织开展一次拒绝手机__健康学习生活的演讲活动.请你根据下面的提示用英语写一篇演讲稿. 要求:1.字迹工整书写规范包含全部要点适当发挥; 2.文中不得出现真实的学校班级名称; 3.80词左右开头和结尾已给出不计入总词数; 4.请将书面表达内容写在答题卡上相应的位置. 参考词汇:eyesight视力disadvantage不利条件keepawayfrom远离 takeanactivepartin积极参加 Girlsandboys WiththedevelopoftheInternetmanystudentshavesmartphones. __________ That'sallThankyou!

1分﹣﹣﹣You'dbettertakeanumbrella.Theweatherreportsaysitintheafternoon. ﹣﹣﹣Thankyou.Iwillputoneinmybag. A.willrain B.rains C.israining

1分﹣﹣﹣WhereisMonica?Ican'tfindheranywhere. ﹣﹣﹣Shebeinthelibrary.Shelovesreadingbookswhensheisfree. A.must B.need C.can't

10分Myteachersaidtoastudent:Givemeyourphone. Wealllookedinsurprise.KyleastudentwhoIneversawtextinclassgavetheteacherhisphone. WhentheteacherlefttwostudentswhoIoftensawtextinclassstartedboastingabouthowtheysenttextmessagesandnevergotcaught. Kyleyoustupid!IputmyphoneundermydesksoitlookslikeI'mlookingatmytextbooksoneofthemsaid. Isn'titfunnythatwealwaystextandnevergetcaught?theotheronelaughed. TheymusthavethoughttheyweresmartbecausetheynevergotcaughtandKyledid.Butwhichsituationisworse:gettingcaughtorgettingawaywithit?Rulesarethereforareason. Thesetwostudentsmightnotgetcaughtbutneitherofthemhadgoodgrades.Theydidn'tpayanyattentiontotheclassandIthinktheywillkeepdoingthis. Peopledon'tjustbreakbigrulesandgetthrownintojail监狱overnight.Theytakeitonestepatatime.Kylemighthavegottencaughtbutatleasthelearnedagoodlesson.Hewillnotbreaktherulesinthefuturesohewilllearnmoreinclassandstayoutoftrouble.It'ssmarternottobreaksmallrules. 1WhydidtheteacheraskKyletogiveuphisphone? A.BecauseshewantedtofindoutwhatKylejusttexted. B.BecauseKylewasplayingwithhisphoneinclass. C.BecausethestudentswantedtoseeKyle'snewphone. 2WhatdoestheunderlinedwordboastinginParagraph3probablymean? A.吹嘘 B.讨论 C.报告 3Thetwostudentsinthewriter'sclassfeltquitebecausetheywerenevercaughtbytheteacher. A.surprised B.calm C.proud 4Inthefuturethetwostudentsmight. A.paymoreattentioninclass B.keeptextingduringclass C.notbreakanyrulesagain 5Fromthestoryweknowthatthewriter. A.doesn'tthinkKyleisagoodstudent B.thinksgettingcaughtinclassisworse C.thinksthetwostudentsmightbreakbiggerrules

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

已知a比b多25%那么ab的最简比是．

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

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

1分isquiteeasyforpeopletofindanyplaceintheworldwiththehelpofonlinemaps. A.That B.It C.One

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

8分TheRoyalMinthaschosenBeatrixPotter'sthievingPeterRabbitasthefirstcharacterfromchildren'sliteratureevertoappearonaUKcoin.PeterpicturedinthebluejacketthatheisforcedtoabandoninthegardenofMrMcGregorwhenheiscaughtstealingvegetablesiscapturedonaspecialcolourededitionofa50pcoinavailablefromnow.TheRoyalMintwhichdescribedPeterasthemostrecognizableofPotter'screationsandoneofthemostcherishedfromchildren'sliteraturewillreleaseuncolouredversionsofthecoininchangelaterthisyear.ThreemoreofPotter'scharacterswillalsobecommittedtocurrencylaterthisyearaspartofcelebrationsmarking150yearssincethechildren'sauthor'sbirth.TheimageshavebeencreatedbycoindesignerEmmaNoblewhosaiditwasamazingtobegiventheopportunitytoworkwithsuchfamousandtreasuredliterarycharacters.Potter'sTheTaleofPeterRabbitfeaturingPeterandhisbetter﹣behavedsiblings兄弟姐妹FlopsyMopsyandCottontailwasthefirstofherstoriestobepublishedreleasedin1902byFrederickWarne&Co.Potterwouldgoontofollowitwithaseriesofmuch﹣lovedstorieswhichremainpopulartodayfromTheTaleofSquirrelNutkintoTheTaleofJemimaPuddle﹣Duck.1Whichcharacterfromchildren'sliteraturecanbefoundontheUKcoinA.JemimaPuddle﹣DuckB.SquirrelNutkinC.FlopsyMopsyandCottontailD.PeterRabbit2AccordingtothepassagethecoinswillbereleasedbytheRoyalMintto.A.celebratethe150thanniversaryofthebirthofBeatrixPotterB.celebratethe150thanniversaryofthebirthofPeterRabbitC.celebratethefirstpublicationofTheTaleofPeterRabbitD.promotethesalesofBeatrixPotter'sworks3WhichofthefollowingstatementistrueA.PeterRabbitisoneofthemostrecognizedliterarycharactersinUK.B.TheTaleofPeterRabbitmainlyfeatureshisbetter﹣behavedsiblings.C.ItwasEmmaNoblewhocreatedPeterRabbitthefamousliterarycharacter.D.UncolouredversionsofthePeterRabbitcoinareavailablenow.4WhereisthispassageprobablytakenfromA.AnautobiographyB.Achildren'sbookC.AtravelguideD.Anewsreport

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

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．

小红用斜面小车装置来探究力对物体运动的影响她让同一小车从同一斜面的同一高度滑下在表面材料不同的水平面上运动分别停在如图甲所示的不同地方． 1小车从斜面下滑时速度越来越快这是因为小车的重力势能转化为缘故．由实验现象我们可以推断假如表面绝对光滑水平面上运动的物体在水平方向上不受力它将． 2小红又用斜面和铁球研究物体动能的大小与哪些因素有关．小红先让铁球A从斜面上高h的位置由静止释放撞击木块B如图乙所示记录下推动木块运动的距离S． 若要研究动能大小与速度的关系小红接下来的操作要领是选择选填相同的小球或不同的小球让小球从选填同一高度或不同高度滑下． 3在图乙中物体动能的大小是通过来反映的下面的实验中也用到了这种方法的是． A．用吸引大头针的数量来描述磁性强弱 B．用水流对比电流 C．研究压强与压力关系时探究受力面积不变 D．牛顿第一定律的得出

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

2019年春晚精彩纷呈如图所示是武术少林魂的画面演员甲站在一个由多位演员乙托起的大鼓上下面说法正确的是

10分Whatsubjectdoyouworryaboutthemostatschool?Manystudentsworryaboutmath.Somestudentscan'tsleepwellthedaybeforeamathexam.Othersmayfeelverynervousduringtheexamitself.Buttheremightbeawaytomakethesubjectlessstressful压力大的. Forpeoplewhoareworriedaboutmathposture姿势makesabigdifferenceErikPeperfromSanFranciscoStateUniversitytoldtheDailyMail.That'sright﹣sittingupstraightcanhelpyoudobetteronmathexams. Scientiststested125collegestudents.Theyaskedthemtodoasimplemathexamwhilesittinginaslumped﹣over趴倒的postureorsittingupstraight.Afterthetest56percentofstudentssaidtheexamwaseasiertodoiftheyweresittingupstraight. Slumpingoverisadefensive戒备的posture.Itcanbringaboutbadmemoriesinthebodyandbrain.ThiscanstopyoufromthinkingclearlyPepersaid. Studentswhowerenotnervousabouttakingthemathexamdidnotnecessarilybenefit受益frombetterposture.ButtheydidfindthatdoingmathwhileslumpedoverwasmoredifficultScienceDailyreported. Goodpostureisn'tjusthelpfulfortakingmathexams.Sportspeoplemusiciansandpublicspeakerscanallbenefitfrombetterposture.Whenyoufeelstressedoutyoucanalsotrytositupstraightorstandtall.Itcanhelpyoufeelmorecertainandfocusbetter. 1Whatposturecanmakepeoplefeellessstressedduringmathexams? A.Sittingupstraight. B.Hangingyourhead. C.Lyingonyourback. D.Raisingonehand. 2Whatdidthescientistsaskthecollegestudentstododuringthetest? A.Todosit﹣ups. B.Tocountnumbers. C.Tothinkcarefully. D.Tositindifferentpostures. 3Howmanystudentsinthetestbenefitedfromthebetterposture? A.Allthe125students. B.Lessthanhalfofthem. C.56percentofthem. D.Noneofthestudents. 4Thefourthparagraphiswrittentoexplain. A.whyslumpingovermakesexamshardertodo B.whyslumpingoverisbadforone'shealth C.whysomepeopleslumpoverduringexams D.whypeoplearenervousduringmathexams 5Whichofthefollowingisthebesttitleforthepassage? A.SlumpovertoTakeExams B.SituptoDoMath C.BetterPostureforNervousStudents D.GoodAdviceforBetterExams

所有的质数都是奇数所有的合数都是偶数．判断对错

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＝

下面分别是树叶的平面图每个小方格表示1平方厘米．先把整格和不满整格的分别涂上不同颜色数一数各有多少个再算出这片树叶的面积大约各是多少平方厘米．不满整格的都按半格计算 整格个不满整格个面积大约平方厘米．

东北师大附小的长是120米宽是50米．在平面图上用10厘米的线段表示校园的宽该图的比例尺是平面图上的长应画厘米．

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

小美的奶奶在冬天遇寒会肩痛于是她就购买如图所示的暖宝宝让奶奶贴用暖宝宝主要是由铁粉活性炭蛭石无机盐和水等合成的聚合物撕开明胶层可立即与空气中的氧气作用从而放出热量．所以它的工作原理是将化学能转化成能再通过的方式让肩膀升温

下面百分率可能大于100%的是

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