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在阳台上用营养液进行无土栽培蔬菜，已成为城镇居民“亲近自然，享受绿色生活”的家庭时尚，营养液配方中属于复合肥料的是（ ）
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有机生态型无土栽培是指用基质代替天然土壤用有机固态肥料直接清水灌溉代替 灌溉的一种无土栽培技术
营养液
水
基质
土壤
无土栽培的营养液偏酸时可加NaOH液调整
阳台无土栽培蔬菜已成为城镇居民亲近自然享受绿色生活的家庭时尚既可缓解工作学习的疲劳还可收获安全新鲜的
无土栽培的某种营养液中含碳铵的质量分数为7.1%某蔬菜生产基地欲配制该营养液200kg需要碳铵的质量
7.1kg
14.2kg
71kg
142kg
以下是某同学证明镁是植物必需元素的设想你认为最合理的一个是
分别用完全营养液和除去镁元素的完全营养液浇灌用沙土培养的植物
分别用蒸馏水和用蒸馏水配制的镁盐溶液无土栽培植物
分别用蒸馏水和用蒸馏水配制的镁盐溶液浇灌用沙土培养的植物
分别用完全营养液和除去镁元素的完全营养液无土栽培植物
在控制温度和大气成分的温室中可以用人工配制的营养液进行蔬菜的无土栽培下表为营养液成分表右下图为
无土栽培营养液经过一段时间使用后应添加原来的营养液
无土栽培的主要设备包括栽培床营养液循环和灌溉系统基质只和测试仪表 等
在控制温度和大气成分的温室中可以用人工配制的营养液进行蔬菜的无土栽培下表为营养液成分表右下图为
无土栽培所用营养液配制时第一步先进行
无土栽培改变了传统农业离不开土壤的限制实施无土栽培要适时更换营养液主要目的是为植物生长提供所需的
脂肪
蛋白质
无机盐
维生素
无土栽培中通常对作物浇施营养液营养液的配方总要求包括哪些
无土栽培营养液是多种化合物的水溶液这些化合物含有作物生长所需的营养元素在配制无土栽培番茄的营养液时需
复合肥
磷肥
钾肥
氮肥
在控制温度和大气成分的温室中可以用人工配制的营养液进行蔬菜的无土栽培下表为营养液成分表右下图为
在控制温度和大气成分的温室中可以用人工配制的营养液进行蔬菜的无土栽培下表为营养液成分表右下图为
无土栽培营养液偏碱时可加H3PD4调整
无土栽培的某种营养液中含硝酸钾的质量分数为7.1%某蔬菜生产基地欲配制该营养液200kg需要硝酸钾的
7.1kg
14.2kg
71kg
142kg
营养液的配制是无土栽培的重要技术环节要求有适合的浓度酸碱度和盐度等
阳台无土栽培蔬菜已成为城镇居民亲近自然享受绿色生活的家庭时尚既可缓解工作学习的疲劳还可收获安全新鲜的
无土栽培是设施农业中的主要技术无土栽培也即水培就是不用土壤而用营养液来栽培植物大多数水培中为固定植物
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不等式组有4个整数解则m的取值范围是．
如图将边长为2的正六边形ABCDEF绕顶点A顺时针旋转60°则旋转后所得图形与正六边形ABCDEF重叠部分的面积为．
10分Weallknowtheimportanceofcuriosityandherearesometipsonhowtodevelopit. Keepanopenmind.Thisisessentialifyouaretohaveacuriousmind.Beopentolearningunlearningandrelearningthings.1Thereforeyoushouldbepreparedtoacceptthispossibilityandchangeyourmind. 2Mostpeoplejustaccepttheworldasitis.Thiswaytheywillcertainlylosetheholycuriosity.Trytodigdeeperbeneaththesurfaceofwhatisaroundyou.Asurewaytodigdeeperbeneaththesurfaceisaskingquestions.Whatwhywhenwhowhereandhowarethequestionscuriouspeoplealwaysask. Don'tlabel标注anythingasboring.Wheneveryoulabelsomethingasboringyoucloseonemoredoorofpossibilities.Curiouspeopleareunlikelytoconsiderthingsboring.3 Eveniftheydon'tyethavetimetoexplorethemtheywillleavethedooropentobevisitedanothertime. Takelearningassomethingfun.Ifyouseelearningasaburdenthere'snowayyouwillwanttodigdeeperintoanything.Thatwilljustmaketheburdenheavier.Howeverifyouthinkoflearningassomethingfunyouwillnaturallywanttodigdeeper.4 Readdiversematerials.Itwillintroduceyoutothepossibilitiesandexcitementofotherworldswhichmayattractyourinterestinexploringfurther.Oneeasywaytodothisisthroughreadingdiversematerials.5It'llfeedyourmindwiththeexcitementofanewworld. A.Nevertakethingsasgranted. B.Don'tspendtoomuchtimeonjustoneworld. C.Trytopickabookormagazineonanewsubject. D.Somethingsyouknowandbelievemightbewrong. E.Itdoesn'tmatterthatyoudon'tagreetoothers'opinions. F.Insteadtheyalwaysseethesethingsasadoortoanexcitingnewworld.G.Solookatlifethroughtheglassesoffunandenjoythelearningprocess.
15分Therewasonceasmallboywhowouldnevergetdressedwhenhisparentstoldhimto1wouldhewearwhattheywantedhimto.Hepreferredunusualclothesbutaboveallhelikedtakinghistime.Hisparentswerealwaysinarushandwantedhimtobemuch2quickbuttheboydidn'tlikethis3hewouldslowdownevenmore. Onedayhisparentsgotsoangrywhenherefusedtodressthattheytoldhimtogooutwithoutanyclothesatall.4amusetheboyfollowedhisparentsoutofthedoor.Heheldabelief5nobodycoulddoanythingtohim. Astheboystoodoutsidehishousewithnothingonwaitingforhisparents'caralongcamethelocalpigfarmer.Thefarmer6wasalmostdeafhadverypooreyesight.Notonlythatbutalsohe7forgethisglassesthatday.Whenhesawtheboy'spinkskinhethoughtitwasoneofhispigs.Shoutingandpushingthefarmerforced8intoapigcage. Theboybeggedhimtostopbutthedeaffarmercouldn'thear. Whenfoundbyhisparentstheterrifiedboyneveragainwantedtobemistaken9anythingotherthanahumanbeing.Nowhe'sthefirst10getdressedandalwayslooksneat.
计算﹣20﹣|﹣4|＝．
点my1m+1y2都在函数y＝kx+b的图象上若y1﹣y2＝3则k＝．
解不等式组并把不等式组的解集在数轴上表示出来．
下列计算中正确的是
某种计时“香篆”在000时刻点燃若“香篆”剩余的长度hcm与燃烧的时间xh之间是一次函数关系h与x的一组对应数值如表所示 1写出“香篆”在000时刻点然后其剩余的长度hcm与燃烧时间xh的函数关系式并解释函数表达式中x的系数及常数项的实际意义 2通过计算说明当“香篆”剩余的长度为125cm时的时刻．
如图抛物线y＝ax2+bx+过点A10B50与y轴相交于点C． 1求抛物线的解析式 2定义平面上的任一点到二次函数图象上与它横坐标相同的点的距离称为点到二次函数图象的垂直距离．如点O到二次函数图象的垂直距离是线段OC的长．已知点E为抛物线对称轴上的一点且在x轴上方点F为平面内一点当以ABEF为顶点的四边形是边长为4的菱形时请求出点F到二次函数图象的垂直距离． 3在2中当点F到二次函数图象的垂直距离最小时在以ABEF为顶点的菱形内部是否存在点Q使得AQBQFQ之和最小若存在请求出最小值若不存在请说明理由．
如图四边形ABCD是平行四边形用直尺和圆规作∠BAD的平分线AG交BC于点E若BF＝6AB＝5则∠AEB的正切值为
已知反比例函数y＝的图象经过点13若x＜﹣1则y的取值范围为
如图△ABD内接于⊙O弦AB不经过圆心O弦DC∥AB延长AB至E使BE＝AB连接ECF是EC的中点连接BF． 1求证＝ 2求证BF＝BD 3若AB＝AD四边形DCEB为平行四边形时求∠DBF的度数．
10分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Λ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:在错的词下划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. Thefirstdaywegotohighschoolourheadteachertoldusthenewswhichweneededtotakethemilitarytraining.Wewereallshockingatthenewsbecauseofitwassohotoutside.Howterriblyitwas!Thenextdaywemetourtraininginstructorwhowereyoungandhandsome.Hewasstrictbuthumoroustellinghimjokeswhenwerested.Atnightheaskedussingmilitarysongs.Weevencompetedwithotherteams.Thedaysofthemilitarytrainingswerebeautifulandwefoundthetrainingwasnotthathard.Webecamestrongerandmadefriendstoourmilitaryinstructor.
8分Abargainissomethingofferedatalowandadvantageousprice.Amorerecentdefinitionis:abargainisadirtytricktoforcemoneyoutofthepocketsofsillyandinnocentpeople. Thecostofproducinganew﹣forexample﹣toothpastewouldmake80ptheproperpriceforitsowewillmarketitat1.20.Itisnotabadtoothpasteandaspeopleliketotrynewthingsitwillsellwelltostartwith;buttheattractionofnoveltysoonfadessosaleswillfall.Whenthathappenswewillreducethepriceto1.15.Andwewillturnitintoabargainbyprinting5pOFFalloverit. Sometimesitisnot5pOFFbut1pOFF.Whatbreathtakingrudenesstoadvertise1pOFFyoursoaporwashingpowderorwhatever!Eventhepoorestold﹣agepensioneroughttoregardthisasaninsult侮辱buthedoesn't.Abargainmustnotbemissed.Peoplesayonehastohavewashingpowderorwhateverandonemightaswellbuyitapennycheaper. Therealdangerstartswhenunnecessarythingsbecome‘bargains'.Manypeoplejustcannotresistbargains.Providedtheythinktheyaregettingabargaintheywillbuyclothestheywillneverwearorfurnituretheyhavenospacefor.OnceIheardofamanwhoboughtanelectricsaw电锯asabargainandcutofftwoofhisfingersthenextday.Buthehadnoregrets:thesawhadbeentrulycheap. Quiteafewpeopleactuallybelievethattheymakemoneyonsuchbargains.Aladyoncetoldme:I'vehadaluckydaytoday.Iboughtadressfor120reducedfrom400;andIboughtabeautifulPersiancarpetfor600reducedfrom900.Itwillneveroccurtoherthatshehasactuallywasted720.Shefeelsasthoughshehadmade580.ShealsofeelsIamsurethatifshehadmoretimeforshoppingshecouldmakealivingoutofit. Somepeoplebuyinlargequantitiesbecauseitischeaper.Onceacoupleboughtenoughsugarfortheirlifetimeandthelifetimeoftheirchildrenandgrandchildren.Theythoughtitabargainnottobemissed.Whenthesugararrivedtheydidn'tknowwheretostoreit﹣untiltheyrealizedthattheirtoiletwasaveryspaciousone.Sothatwaswheretheypileduptheirsugar.Notonlydidtheirguestsfeelratherstrangewhenevertheywereofferedsugartoputintotheircoffeebutthetoiletbecameextremelysticky. Toofferbargainsisacommercialtricktomakethepoorpoorer.Whengreedyfoolsfallforthistrickitservesthemright. 1Whichwordbestdescribesthelanguagestyleofthepassage? A.Polite. B.Foolish. C.Humorous. D.Serious. 2WhatdoestheunderlinedwordnoveltyinParagraph2probablymean? A.Goodquality. B.Lowprice. C.Newness. D.Curiosity. 3Howdoestheauthorfeelabout1pOFFaproduct? A.It'sagiftforpoorpeople. B.It'sanoffensetoshoppers. C.It'sabargainworthtrying. D.It'sarealreductioninprice. 4Whichstatementwilltheauthorprobablyagreewith? A.Bargainsarethingspeopledon'treallyneed. B.Bargainsareoftenrealcheapproducts. C.Bargainshelppeoplemakealiving. D.Bargainsplaytricksonpeople.
30分MostpeopleneedtohearIloveyou.Onceinawhiletheyhearthemjust1.ImetConniethedayshewas2tothehospiceward病房whereIworkedasa3.HerhusbandBillstoodnervousnearbyasshewas4tothehospitalbed.WhileConniewasinthefinal45ofherfightagainstcancershewas6.Conniewasa7.Aswebecameacquaintedsheconfided吐露how8itwastobemarried32yearstoamanwhooftencalledherasillywoman.IknowBilllovesme.shesaid.Buthehasneverbeenonetosayhelovesmeorsendcardstome.I'dgiveanythingifhe'dsay‘Iloveyou'butit'sjustnotinhis9.SoonwhenConniehadfewer10momentsIbeganspendingmoreofmyvolunteertimewithBill.OnedayIgothimonthe11ofwomenhowweneedromanceinourlivesandhowwelovetogotsentimentalcards.Idon'thavetohesaid.SheknowsIdo!I'msuresheknowsIsaidbutsheneedstohearwhatshehas12toyoualltheseyears.Pleasethinkaboutit.TwodayslaterIwalkeddownthehospicewardatnoon.TherestoodBillleaning13thewallinthehallwayandstaringatthefloor.IalreadyknewConniehad14at11a.m.WhenIsawBill.hisfacewaswetwith15andhewas16.HesaidIhavetosayhowgoodIfeelabouttellingher.Hestoppedto57hisnose.ThismorningItoldherhowmuchIlovedherandlovedbeingmarriedtoher.You58haveseenhersmile!IwentintotheroomtosaygoodbyetoConnie.ThereonthebedsidetablewasalargeValentine19fromBill20:TomywonderfulwifeIloveyou.1A.ontime B.attimes C.intime D.behindtime2A.allowed B.admitted C.committed D.acknowledged3A.nurse B.cleaner C.doctor D.volunteer4A.translated B.transferred C.transformed D.transported5A.step B.stage C.state D.stair6A.anxious B.worried C.frightened D.cheerful7A.reminder B.performer C.romantic D.hostess8A.disturbing B.shocking C.annoying D.frustrating9A.nature B.mind C.1ife D.style10A.sleeping B.yawning C.waking D.crying11A.lesson B.subject C.point D.focus12A.shown B.explained C.expressed D.meant13A.on B.by C.against D.over14A.passedby B.passedon C.passeddown D.passedaway15A.sweat B.rain C.tears D.water16A.struggling B.trembling C.sighing D.sinking17A.blow B.touch C.scratch D.rub18A.would B.could C.might D.should19A.card B.gift C.paper D.package20A.telling B.reading C.writing D.announcing
关于x的一元二次方程x2﹣2m﹣1x﹣m2﹣m＝0的根的情况是
25分随着母亲节的临近班级要召开以'感恩母亲'为主题的班会要求大家介绍一下对自己母亲的感激之情.主要内容包括母亲为我们做了什么以及你如何回报她的付出.请结合如上内容以'ThankyoumyMother'为题写一篇发言稿.要求:1.句子通顺语意连贯;2.包括所有提示内容;3字数100字左右ThankyoumyMother!WithMothers'dayaroundthecorner
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8分Myfifteen﹣year﹣oldsonhasjustreturnedfromabroadwithrollsofexposedfilmandahundreddollarsinuncashedtraveler'schecksandisasleepatthemoment.Hisblueduffel粗呢bagliesonthefloorwherehedroppedit.Obviouslyhepostponedasmuchsleepashecould:whenhewalkedinandwehuggedhiselectricalsystemsuddenlyswitchedoffandheheadeddirectlyforthebedwhereIimaginehebeathisoldrecordofsixteenhours.ItwashisfirsttripoverseassoweeksbeforeitIpressedtravelbooksonhimandatapecassetteofusefulFrenchphrases;drewupalistofpeopletovisit;advisedhimonclothingandotherthings.Attheluggagestorewherewewenttobuyhimasuitcaseheheadedfortheduffelssayingthatsuitcasesweremoreforoldpeople.Duringthetriphecalledhomethreetimes:fromLondonParisandavillagenamedUllapool.NearUllapoolheclimbedamountaininarainstormthatalmostblewhimoff.InthevillageamanspoketohiminGaelicandtoopolitetointerruptmysonlistenedtohimfortenorfifteenminutestryingtonodintherightplaces.TheFrenchhelearnedfromthecassettedidn'tholdwaterinParis.TheFrenchhetalkedtoshruggedandwalkedon.WhenmysoncalledIsatdownatthekitchentableandleanedforwardandhungoneveryword.Hisvoicecamethroughclearlythoughtwoofthecallswerelikeship﹣to﹣shorecommunication.WhenIinterruptedhimwithaGreat!oraReally?Iknockedalittleholeinhiscommunication.SoIjustsatandlistened.Ihaveneverlistenedtoatelephonesoattentivelyandwithsomuchpleasure.Itwaswonderfultohearnewsfromhimthatwassonewtome.InmybookhewasthefirstmantolandonthemoonandIknewthatIhadnoadvicetogivehimandthatwhatIhadalreadygivenwasprobablynotmuchhelp.Theunusedchecksarecertainlyevidenceofthat.Youthtravelslight.Nosuitcasenotmuchluggageandaslimexpenseaccountandyethewenttothesceneandcamebacksafely.Isithereamazed.Thenightwhenyourchildreturnswithdustonhisshoesfromacountryyou'veneverseenisanightyouwouldgladlyturnintoaweek.1Duringthetriptheauthor'sson.A.ranoutofmoneyB.hadinadequatesleepC.forgottocallhismotherD.failedtotakegoodpictures2Accordingtothepassagewhichofthefollowingcouldbestdescribetheauthor'sson?A.Politeandcareless.B.Creativeandstubborn.C.Considerateandindependent.D.Self﹣centeredandadventurous.3Whatdoestheunderlinedwordthatinthelastparagraphreferto?A.Itisimportanttolistentoyourchild'sstory.B.It'seasytointerruptthechatwithyourchild.C.Theauthorisproudofhersonlandingonthemoon.D.Thesonnolongerneedsmuchhelpfromhismother.4Whatcanweinferfromthepassage?A.Goodparentsshouldprotecttheirchildrenfrompotentialdangers.B.Theworldisabookandthosewhodonottravelreadonlyonepage.C.It'sanicechoicetogiveachildspacetoexperienceandexplore.D.Communicationbetweenparentsandchildrenisextremelyimportant.
2018年江苏省实现GDP约92500亿元．用科学记数法表示92500是．
8分Perhapsyouthinkyoucouldeasilyaddtoyourhappinesswithmoremoney.Strangeasitmayseemifyou'reunsatisfiedtheissueisnotalackofmeanstomeetyourdesiresbutalackofdesires﹣notthatyoucannotsatisfyyourtastesbutthatyoudon'thaveenoughtastes. Realrichesconsistofwelldevelopedandheartycapacities能力toenjoylife.Mostpeoplearealreadyswamped淹没withthings.Theyeatweargoandtalktoomuch.Theyliveintoobigahousewithtoomanyroomsyettheirhouseoflifeisahut. Yourhouseoflifeoughttobeamansion豪宅aroyalpalace.Everynewtasteeveryadditionalinteresteveryfreshenthusiasmaddsaroom.Hereareseveralroomsyourhouseoflifeshouldhave. Artshouldbeadesireforyoutodevelopsimplybecausetheworldisfullofbeautifulthings.Ifyouonlyunderstoodhowtoenjoythemandfeedyourspiritonthemtheywouldmakeyouashappyastofindplentyofhamandeggswhenyou'rehungry. Literatureclassicliteratureisabeautifulrichlyfurnishedroomwhereyoumightfindmanyanhourofrestandrefreshment.Togainthatlovewouldgotowardmakingyouarichpersonforarichpersonisnotsomeonewhohasalibrarybutwholikesalibrary. MusiclikeMozart'sandBach'sshouldn'tbeabsent.Realrichesareofthespirit.Andwhenyou'vebroughtthatspirituptowhereclassicalmusicfeedsitandmakesyoualittledrunkyouhaveincreasedyourthrillsandbetteredthem.Andlifeisamatterofthrills. Sportswithoutwhichyouremainpoormeanalotinlife.Nomatterwhoyouareyouwouldbemorehumanandyourhouseoflifewouldbebettersupportedagainstthebaddaysifyoucouldanddidplayabit. Whateverroomsyoumightaddtoyourhouseoflifethesecretofenjoyinglifeistokeepadding. 1Theauthorintendstotellusthat. A.truehappinessliesinachievingwealthbyfairmeans B.bighousesarepeople'smostvaluedpossessions C.bighousescaninasensebringrichnessoflife D.truehappinesscomesfromspiritualriches 2Itcanbelearnedfromthepassagethat. A.moremoneybringsmorehappiness B.artisneededtomakeyourhousebeautiful C.literaturecanenrichyourspirituallife D.sportscontributemainlytoyourphysicalfitness 3Whatwouldbethebesttitleforthepassage? A.HouseofLife B.SecretofWealth C.RestandRefreshment D.InterestandEnthusiasm 4Theunderlinedsentenceinthesecondparagraphprobablyimpliesthat. A.howevermateriallyrichtheyneverseemtohesatisfied B.howevermateriallyrichtheyremainspirituallypoor C.thoughtheirhouseisbigtheypreferasimplelife D.thoughtheirhouseisbigitseemstobeacage
全球已经进入大数据时代大数据bigdata是指数据规模巨大类型多样且信息传播速度快的数据库体系．大数据在推动经济发展改善公共服务等方面日益显示出巨大的价值．为创建大数据应用示范城市我市某机构针对市民最关心的四类生活信息进行了民意调查被调查者每人限选一项下面是部分四类生活信息关注度统计图表请根据图中提供的信息解答下列问题 1本次参与调查的人数是多少 2关注城市医疗信息的有多少人并补全条形统计图 3扇形统计图中D部分的圆心角的度数是多少 4写出两条你从统计图中获取的信息．
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某幢楼10户家庭每月的用电量如表所示 那么这10户家庭该月用电量的众数和中位数分别是
如图在边长为4的正方形ABCD中点EF分别是BCCD上的动点且EF＝4G是EF的中点下列结论正确的是
8分Inthemid1950sIwasasomewhatboredearlyadolescentmalestudentwhobelievedthatdoinganymorethannecessarywaswastedeffort.Onedaythisapproachthrewmeintoembarrassment.InMrs.Totten'seighthgrademathclassatCentralAvenueSchoolinAndersonIndianawewerelearningtoaddandsubtractdecimals小数.Ourteachertypicallyassigneddailyhomeworkwhichwouldberecitedinclassthefollowingday.Onmostdaysourgradeswerebasedonouroralanswerstohomeworkquestions.Mrs.Tottenusuallywalkedupanddowntherowsofdesksrequestinganswersfromstudentafterstudentintheorderthequestionshadappearedonourhomeworksheets.Shewouldstarteitheratthefrontorthebackoftheclassroomandworktowardtheotherend.SinceIwasseatednearthemiddleofabout35studentsitwaseasytofigureoutwhichquestionsImighthavetoanswer.ThisparticulartimeIhadcompletedmyusualtwoorthreeproblemsaccordingtomycalculations.WhatIfailedtoexpectwasthatseveralstudentswereabsentwhichthrewoffmyestimate.AsMrs.TottenmadeherwayfromthebeginningoftheclassIdesperatelytriedtodeterminewhichmathproblemIwouldget.ItriedtoworkitoutbeforeshegottomebutIhadbrainfreezeandcouldn'tfunction.WhenMrs.TottenreachedmydesksheaskedwhatanswerI'dgotforproblemNo.14.IIdidn'tgetanythingIansweredandmyfacefeltwarm.Correctshesaid.Itturnedoutthatthecorrectanswerwaszero.WhatdidIlearnthatday?Firstalwaysdoallyourhomework.Secondinreallifeitisn'talwayswhatyousaybuthowyousayitthatmatters.ThirdIwouldnevermakeitasamathematician.IfIcouldchooseoneschooldaythattaughtmethemostitwouldbethatone.1WhatdoestheunderlinedpartinParagraph1indicate?A.Itiswisetovalueone'stime.B.Itisimportanttomakeaneffort.C.Itisrighttosticktoone'sbelief.D.Itisenoughtodothenecessary.2Theauthorcouldworkoutwhichquestionstoanswersincetheteacheralways.A.askedquestionsinaregularwayB.walkedupanddownwhenaskingquestionsC.chosetwoorthreequestionsforthestudentsD.requestedherstudentstofinishtheirusualquestions3Theauthorfailedtogetthequestionshehadexpectedbecause.A.theclassdidn'tbeginasusualB.severalstudentsdidn'tcometoschoolC.hedidn'ttryhardtomakehisestimateD.Mrs.Tottendidn'tstartfromthebackoftheclass4Whichofthefollowingcanbethebesttitleforthepassage?A.AnUnforgettableTeacherB.AFutureMathematicianC.AnEffectiveApproachD.AValuableLesson
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