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某校对甲乙两个文科班的数学成绩进行分析规定大于或等于120分为优秀120分以下为非优秀统计后得到如下的2×2列联表 经过计算得到随机变量k2约为7.510则至少有把握认为“成绩与班级有关系”．
以下是解决数学问题的思维过程的流程图 在此流程图中①②两条流程线与“推理与证明”中的思维方法匹配正确的是
已知回归直线的斜率的估计值为1.23样本点的中心为56则回归直线方程为
下列关于生物进化的叙述正确的是
地球和火星分别是距离太阳第三和第四近的行星可认为这两颗行星都在围绕太阳做同向的匀速圆周运动火星的公转半径r2约是地球公转半径r1的1.52倍．现要发射一颗火星探测器探索火星表面的地理环境和矿产已知地球的公转周期为1年探测器从地球上发射沿椭圆轨道运动半周追上火星时的发射过程最节省燃料则此发射过程探测器运行的时间约是
Iwasonceadropout.Iknowhowpowerfullya1caninfluencethelifeofapersonwhodoesnot2herself.Iquitschoolatsixteentowork.YearslaterIhadan3andcouldn'tworkformonths.Ifeltdepressed.WithanunemployablefatherandamentallyillmothertosupportIcouldn't4togiveup. SearchingtheadsIfoundanoticethatourlocalcommunitycollegeofferedfreework5.Onerequirementwasahigh﹣schooldiplomaorGEDcertificate.YearsagoIgotmyGEDcertificatebutwith6scores.IfeltcertainthatIhadlittleto7otherthanawillingnessto8. AftermyphysicalinjuryhealedIwenttomeetRubyMartintheadvisorwhowould9me. Isat10waitingwhileMrs.Martinlookedovermyscoresheet.Iwas11tohearherblamemeforwastinghervaluabletime.Shelookedatmeforalongmoment12shespoke. Whydidyouapplyforthis13?sheasked.Whyaren'tyouapplyingtocollege? Withmyfaceburningwith14IcouldonlywhisperedBecauseIam15. Didn'tanyoneeverexplainthese16toyou?sheasked.Ijustshookmyhead.ForthenexthoursheexplainedhowtheGEDscoresarebasedonandthatmy17wereveryhighindeed.SheassuredmethatIwasnotonlynotstupidbutthatIwould18anexcellentcandidateforthetrainingprogram. Iregainedmy19LaterIgotabachelor'sdegreeandbecameateacherjustlikeher.Toteachistotouchalife.ItwasRubyMartinwhotouchedmylife20. 1A.motto B.parent C.teacher D.friend 2A.believein B.commenton C.relyon D.digout 3A.disease B.patient C.baby D.accident 4A.wait B.help C.agree D.afford 5A.opportunities B.training C.certificates D.experience 6A.low B.high C.special D.passing 7A.share B.offer C.hope D.choose 8A.forgive B.listen C.follow D.try 9A.employ B.assess C.challenge D.accept 10A.patiently B.curiously C.comfortably D.nervously 11A.desperate B.sorry C.prepared D.disappointed 12A.until B.before C.since D.after 13A.job B.university C.program D.degree 14A.excitement B.shame C.cold D.anger 15A.poor B.tired C.disabled D.stupid 16A.rules B.schools C.scores D.subjects 17A.salaries B.positions C.expectations D.numbers 18A.meet B.make C.employ D.affect 19A.dignity B.fame C.confidence D.balance 20A.forever B.sometimes C.otherwise D.anyhow
下列关于科学方法的叙述错误的是
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下画一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. Fiveyearsagomyfatherwhowasinhisfortylosthisjob.Atfirsthewasinlowspiritsandoftengetsdrunk.OnedayhereadastoryaboutRenZhengfeiwhichwasgreatlyinspiredhim.Heturnedtoafriendwithwhichhelphesetupafactory.Inhisfactorywastematerialsweremadefullusetoproduceenvironmentallyfriendlypackingbags.Withthesebagswellreceivinghisfactorywentsmooth.Nowhehasextramoneybecauseheoftenhelpsthoseinneed.Sofarhehasdonatedasmanyas＄10000.HowagreatfatherIhave!
因为对数函数y＝logax是减函数大前提而y＝log2x是对数函数小前提所以y＝log2x是减函数结论”．上面推理是
复数＝
Whydomanyofusfind1difficultorimpossibletofallasleepinabedotherthanourown?Isitbecausethebedis2comfort?AccordingtoanewstudypublishedinCurrentBiologyasignificantreasonis3thescientistscallfirstnighteffect.Theybelievethatonesideofthebrainactsasanightwatchtowarnusaboutpotentialdangers.Itforcesus4stayawakeonthefirstnightinanewenvironment. Forthestudy35youngvolunteers5asktosleepinasleeplabforseveraldays.Meanwhileresearcherswatchedtheirbrainactivities. Accordingtotheresearchersontheirfirstnighttheleftbrainswere6activethantherightbrainsandpeoplehadahardtimesleeping.Howeverleft﹣brainactivitydecreasedasdayswentby7falleventothepointofcompletecalm.Inthisprocesstheparticipantsgotanincreasinglybettersleepexperience. The8findingsuggestthatthedifferentrhythmsofthesidesofthebrainaffectoursleep.Whenthetwosideswork9differentthebalancebetweenthemisbroken.Thusthebraincan'trelaxandissensitivetoanythingstrangeinthesurroundingsjust10itisinthedaytime.
若矩形ABCD的周长1为定值则该矩形的面积的最大值是
用分析法证明．
Ca2+泵是存在于细胞膜及细胞器膜上的一种酶能催化ATP水解并将Ca2+运出细胞．Ca2+泵失调与人体多种疾病和细胞衰老有着非常密切的联系．下列叙述错误的是
如图所示质量相等的AB两物块用轻弹簧相连静止在同一竖直线上．现用一竖直向上的恒力F作用在物块A上使物块A向上运动当A的速度刚好为零时B对地面的压力恰好为零则在物块A向上运动的过程中下列说法正确的是
已知曲线C的极坐标方程为ρ2﹣2ρcosθ﹣2ρsinθ＝0直线l的极坐标方程为θ＝ρ∈R曲线C与直线l相交于AB两点则|AB|为
在中等质量恒星的核心或是白矮星表面堆积的氦突然发生核聚变叫氦闪．两个氦核He聚变成BeBe的原子核极不稳定若在它衰变之前恰好与另外一个氦核反应融合就能形成C这个过程又称为3α反应．已知C核的质量为1.99272×10﹣26kgα粒子的质量为6.64672×10﹣27kg真空中的光速为c＝3×108m/s则3α反应中所释放的核能约为
SummerHolidayFun2019! Thesummerholidaysareuponusagain.HereisourguidetosummerholidayfuninPeterborough! PeterboroughMuseum TheAgeoftheDinosaursisthemuseum'smainattractionthissummer.Getupclosetoprehistoriccreaturesviasomegreathands﹣onexhibits！Watchoutformonsterslurkingaroundeveryember！Themuseumisopenfrom1000amto500pmMondaytoSaturdayandfrom1200pmto400pmonSundaysinAugust. Call01733864663fordetails. SaxonYouthClub SchoolholidayfunYoungpeopleaged13﹣19willbeabletoproducetheirownmusiccompeteinsportsactivitiesortrytheirhandatcookingatSaxonYouthClubSaxonCommunityCentreNormanRoadPeterborougheveryMondayandWednesdayfrom300pm.PLUSanaeroballtournamentwilltakeplaceonThursday12thAugustbetween330pmand630pm. Call01353720274fordetails. HoughtonMill ThroughtheLookingGlass﹣anewproductionofthefamilyfavoriteonMonday30thAugust.Bringrugsorchairstositonandapicnicifyouwishtoeatduringtheplay.Gatesopen530pmperformance630pm﹣830pm.Tearoomwillbeopenuntiltheendoftheinterval.Adult￡10.Child￡7.Family￡20. Bookingadvisableon08454505157. FarmlandMuseumandDennyAbbey FarmlandGamesFromWellieWangingtoPretendPloughingmatchescomeandjointheFarmlandTeam.Collectyoursportingstickersandcreateacolorfulrosettethatisfitforawinner！Noneedtobookjustturnupbetween1200pmand400pmonThursday19thAugust.Suitableforchildrenagedfourandaboveeachchildshouldbeaccompaniedbyanadultandallactivitiesareincludedinthenormaladmissionprice.TicketsCost￡7perchild. Forfurtherinformationcall01223810080. 1Ifyouareinterestedincookingyoucangoto. A.PeterboroughMuseum B.HoughtonMill C.SaxonYouthClub D.FarmlandMuseum 2Youwanttowatchthenewplaywithyourparentssoitwillcostyou. A.￡7 B.￡17 C.￡27 D.￡20 3Whichofthefollowingactivitiesneedsparents'company? A.Playingfarmlandgames. B.Watchingthenewplay. C.Competinginsportsactivities. D.Visitingthedinosaurexhibition.
若a∈R2﹣ia+2i∈R则a＝
据有关人士预测我国将逐步进入新一轮消费周期其特点是城镇居民消费热点主要为商品住房小轿车电子信息产品新型食品以及服务消费和文化消费农村消费热点是住房家电．试画出我国消费的结构图．
ItwasoncecommontoregardBritainasasocietywithclassdistinction.Eachclasshaduniquecharacteristics. Inrecentyearsmanywritershavebeguntospeakthe'declineofclass'and'classlesssociety'inBritain.Andinmoderndayconsumersocietyeveryoneisconsideredtobemiddleclass. Butpronouncingthedeathofclassistooearly.Arecentwide﹣rangingsocietyofpublicopinionfound90percentofpeoplestillplacingthemselvesinparticularclass73percentagreedthatclasswasstillavitalpartofBritishsocietyand52percentthoughttherewerestillsharpclassdifferences.ThusclassmaynotbeculturallyandpoliticallyobviousyetitremainsanimportantpartofBritishsociety.Britainseemstohavealoveofstratification. OneunchangingaspectofaBritishperson'sclasspositionisaccent.Thewordsapersonspeakstellherorhisclass.AstudyofBritishaccentsduring1970sfoundthatavoicesoundinglikeaBBCnewsreaderwasviewedasthemostattractivevoiceMostpeoplesaidthisaccentsounded'educated'and'soft'.Theaccentsplacedatthebottominthisstudyontheotherhandwereregionalcityaccents.Theseaccentswereseenas'common'and'ugly'.HoweverasimilarstudyofBritishaccentsintheUSturnedtheseresultsupsidedownandplacedsomeregionalaccentsasthemostattractiveandBBCEnglishastheleast.ThissuggeststhatBritishattitudestowardsaccenthavedeeprootsandarebasedonclassprejudice. Inrecentyearshoweveryounguppermiddle﹣classpeopleinLondonhavebeguntoadoptsomeregionalaccentsinordertohidetheirclassorigins.Thisisanindicationofclassbecomingunnoticed.Howeverthe1995popsong'CommonPeople'putsforwardtheviewthatthoughamiddle﹣classpersonmay'wanttolivelikecommonpeople'theycanneverappreciatetherealityofaworking﹣classlife. 1ArecentstudyofpublicopinionshowsthatinmodernBritain. A.peopleregardthemselvessociallydifferent B.mostpeoplebelongtomiddleclass C.itiseasytorecognizeaperson'sclass D.itistimetoendclassdistinction 2ThewordstratificationinParagraph3isclosestinmeaningto. A.variety B.qualification C.authority D.division 3Britishattitudestowardsaccent. A.arebasedonregionalstatus B.havealongtradition C.aresharedbytheAmericans D.havechangedinrecentyears 4Whatisthemainideaofthepassage? A.Themiddleclassisexpanding B.Aperson'saccentreflectshisclass C.ClassisakeypartofBritishsociety D.Eachclasshasuniquecharacteristics.
Lastsummerover12000fanswereatWembleyArenainLondonshoutingandcheering.Thousandsmorewerewatchingonline.1Itwasesportsorcompetitivecomputergaming. MillionsofpeopleintheUKplaycomputergamesforfun.Someofthemhavebecomeprofessionalgamersplayinggamesastheirfull﹣timejob.2Theypracticefortenormorehoursadayfiveorsixdaysaweek.Theydoexercisesliketypingsomethingandtryingtotypeitfasterandfaster.Theyalsostudyvideosofotherplayersandplanwaystobeatthem. 3Areplayersathletes?Somesayno.Esportsplayersdon'tneedtorunjumpthrowordobigphysicalactions.AtthemomenttheUKgovernmentclassifiesesportsaskindsofgamesnotassports. Butotherssayyesesportsaresports.Playersdoneedsomephysicalskillsespeciallyhand﹣eyecoordinationreflexesaccuracyandtiming.Ifdartssnookerandshootingareclassifiedassportsthenperhapsesportsshouldbetoo. 4AndtheywillbeanofficialmedalsportintheAsianGamesstartingfrom2022.NextsteptheOlympics? Formanyesportsfansandplayersthoughthemostimportantthingisthatesportsaregrowinginpopularityandimportance.5 A.Butareesportsreallysports? B.Alllikeplayingcomputergames. C.It'snoteasybeingaprofessionalgamerthough. D.Butthiswasn'tafootballbasketballortennismatch. E.Itiscertainthatesportswillcomeintothe2024Olympics. F.InfactChinaandSouthKoreadoclassifyesportsassports. G.Ifesportsarenotasimportantassportsnowtheydefinitelywillbeinthenearfuture.
如图所示光滑斜面与光滑水平面在B点处平滑连接斜面的倾角为37°．质量为1kg的滑块甲在水平面上以2m/s的速度向左匀速运动当甲运动到水平面上C点时质量为0.2kg的滑块乙从斜面上的A点由静止释放一段时间后甲乙两滑块相碰并粘在一起AB＝BC＝3m不考虑滑块大小重力加速度g＝10m/s2sin37°＝0.6cos37°＝0.8．求 1甲乙两滑块相碰点离B点的距离 2两滑块相碰后运动多长时间到达C点．
湿地生态系统在降低污染改善水质方面有重要作用．回答下列问题 1湿地生态系统从浅水区到岸边分布着不同的植物这体现了群落的结构．湿地生态系统具有一定的自我调节能力能保持自身的相对稳定． 2某课题组探究了狐尾藻和黑藻对重金属污染水体的修复功能结果如表 实验结果说明①②③． 3利用水生植物对水体污染进行修复时需定期打捞植物并做无害化处理否则重金属会通过逐级积累富集于最高营养级．同时植物死亡后在微生物的作用下污染物重新进入水体．
已知x＞y则下列各式中一定成立的是
假定你是李华.最近ChinaDaily就如何看待中国传统文化面向社会征稿.请你用英语给编辑写一封信谈谈你自己的想法.要点如下 1表明自己的立场传统文化应该得到保护和传承 2给出你的理由 3呼吁社会共同参与.参考词汇传承inherit
如图所示PQ为带等量异种电荷的点电荷一根光滑绝缘的直杆与PQ连线垂直且竖直放置杆与PQ连线相交于O点PO大于OQ杆上AB两点关于O点对称．将一个带电小球套在杆上从A点由静止释放小球运动到B点时加速度恰好为零则下列说法正确的是
脊髓灰质炎是一种急性传染病我国利用“小儿麻痹糖丸”已消灭脊髓灰质炎．“小儿麻痹糖丸”是一种减毒活疫苗由低致病力的活病毒制成所以这种疫苗存在一定的安全隐患．回答下列问题 1脊髓灰质炎患者会出现肢体有感觉但不能自主运动的症状病毒可能破坏的是填“感觉”或“运动”神经元． 2脊髓灰质炎疫苗属于抗原抗原是指． 3“小儿麻痹糖丸”中的有效成分进入人体内环境后可引起第二道防线中细胞的反应进一步引起机体产生免疫． 4免疫缺陷症接受免疫抑制剂治疗者禁止服用“小儿麻痹糖丸”原因是．
实验小组用如图甲所示的装置做“探究加速度与质量关系”的实验．按要求调整好装置当地的重力加速度g＝10m/s2打点计时器所接交流电的频率为50Hz． 1实验过程中保持砂和砂桶的总质量不变为了保证在改变小车上砝码的质量时小车受到的拉力几乎不变砂和砂桶的总质量m与小车和车上砝码的总质量M之间应满足的条件是． 2平衡摩擦力后开始实验．图乙为某次实验打出的一条纸带在相邻两个计数点间都有四个打点未画出用刻度尺测得ACDE四个计数点到O点的距离并标在纸带上则小车的加速度a＝m/s2．计算结果保留3位有效数字 3改变小车和砝码的总质量M多次实验记录多组小车的加速度a与对应小车和砝码的总质量M作出a﹣图象如图丙所示．得到了合外力一定时小车的加速度与其质量成反比的结论．若砂桶中砂的质量为0.040kg则砂桶的质量为kg．计算结果保留2位有效数字
苹果切开一段时间后会发生褐变原因是受损细胞中的多酚类物质会在多酚氧化酶PPO催化下迅速氧化．研究人员试图通过RNA干扰技术抑制PPO的合成从而培育不会褐变的苹果．如图表示RNA干扰技术的原理． 回答下列问题 1RNA干扰技术需要先合成能转录出特殊双链RNA的目的基因构建后通常利用法将其导入苹果叶肉细胞并进行表达．图中Dicer酶的作用类似限制酶其专一性体现在能并将其切割成较小的片段切割后一段短小RNA参与形成诱导沉默复合体特异性地引起PPO的转录产物降解．可见RNA干扰技术通过影响遗传信息的过程抑制蛋白质合成． 2利用技术可将成功导入目的基因的苹果叶肉细胞培育成完整植株．这一技术的原理是．要诱导离体的叶肉细胞脱分化形成组织培养基中应含有成分．
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