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用适当的方法解下列方程:x²-4x-12=0
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1分CCTV﹣5willofferanbroadcasttohelpfootballfanstoseethematchatthesametime. A.living B.alive C.live D.lively
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15分OneSundaymorninginAugustIwenttolocalmusicfestival.IleftitearlybecauseIhadanappointment1latethatday.Myfriendswalkedmetothebusstopandwaitedwithme2thebusarrived.IgotonthebusandfoundaseatnearthebackandthenInoticedaman3sitatthefront.He4pretendthatatigertoywasrealandgivingitavoice.Hemustbe5mentaldisabled. Behindhimwereotherpeopleto6hewastryingtotalkbutaftersomeminutes7walkedawayandsatnearmelookingannoyed Ididn'twanttobelaughedatfortalkingtohimbutIdidn'tlikeleavinghim8hisowneither. AfterawhileIrosefrommyseatandwalkedtothefrontofthebus.Isatnexttothemanandintroducedmyself.Wehad9amazingconversation.HegotoffthebusbeforemeandIfeltveryhappytherestofthewayhome. I'mgladImadeachoice.Itmade10ofusfeelgood. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
8分 AttentionTimHortons StainlessSteelTravelMugOwners LidRecall﹣15ozStainlessSteelTravelMug Afaultatthecuphasbeenrecognized.Thefaultmayresultinsomelidsliftingslightlyfromthebodyofthemugandcouldprobablycauseinjuryfromhotliquidleaking.Thereforewehavegivenanimmediatelidrecallnotice. ThisRecallnoticeisrelatedonlytoTimHortons15ozStainlessSteelTravelMugssoldbetweenOctober2002andJanuary2003.Thebottomofthemugisstampedwithdistributor's经销商nameThermoServ.Thereisnoprintingonthehandleofthemug. AtTimHortonswevalueourcustomers'safetyaboveanythingelse.SowhetheryourlidisleakingornotintheinterestofyoursafetywearerequestingthatyoubringyourmugtoyournearestTimHortonsexcludingEssoTimHortonswheretheywillexchangethelidforanewlidthatfitssafety.ThenewlidswillbeavailableFebruary12003pleasedonotuseyourmuguntilyouexchangethelid. Here'swhatyoudo *Pleasedonotuseyourmuguntilyouhaveexchangedthelidforanewone. *NewlidswillbeavailableFebruary12003. *ReturnyourtravelmugtoaTimHortonsstoreasofFebruary12003. *Yourlidwillheexchangedforanewlid. Ifyouprefertoreturntheentiremugbringitbackatanytimeforafullrepayment. Ifyouhaveanyquestionsregardingthisrecallpleasecontactusat TollFreeNumber1﹣888﹣601﹣1616 830am﹣500pmEasternStandardTime TimHortons 1.Thisadvertisementistryingto. A.introduceanewtypeofmugs B.persuadepeopletobuyanewlid C.informpeopleofexchangingalid D.warnagainstthedangerofusingthemug 2.Theadvertisementismainlyaimedatthosewho. A.oftentravelaround B.have15ozStainlessmugs C.wanttobuy15ozstainlessmugs D.aresellingthemugs 3.AccordingtotheadvertisementwhichofthefollowingstatementsisNOTtrue? A.Peopleshouldstopusingthemugimmediately. B.Peoplecangetthemoneybackiftheyreturnthemug. C.Peoplewithquestionscancallthecompanyfreeofcharge. D.PeoplecanreturnthelidbetweenOctober2002andJanuary2003. 4.FromthepassagewecanlearnthatTimHortons. A.isaclubfortravelers B.wantstomakemoremoney C.caresaboutthecustomers'safety D.isanorganizationhelpingcustomers
已知双曲线C的离心率为实轴长为2. 1求双曲线C的方程 2若直线y=x+m被双曲线C截得的弦长为求m的值.
已知命题p对任意实数x都有ax2+ax+1>0恒成立命题q关于x的方程x2﹣x+a=0有实数根如果p与q中有且仅有一个为真命题求实数a的取值范围.
如图所示如果根a侧的生长素浓度在曲线A点为10﹣10mol•L﹣1下列描述正确的是
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已知抛物线Cy2=4x直线l与C交于AB两点O为坐标原点. 1当直线l过抛物线C的焦点F时求|AB| 2是否存在直线l使得直线OA⊥OB若存在求出直线l的方程若不存在请说明理由.
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某一家族中的肥胖症不仅由第18号染色体上的Rr基因决定而且还与第2号染色体上的Mm基因有关R基因存在时不能形成黑皮素4受体m基因纯合时不能形成阿黑皮素原其机理如图1所示.图2是该家族系谱图其中Ⅰ﹣1是纯合体Ⅰ﹣2的基因型为mmRr下列有关叙述错误的是
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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∧并在其下面写出该加的词. 删除把多余的词用\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.每处错误及其修改仅限一次. 2.只允许修改10处多者从第11处起不计分. IoftenquarrelaboutmymotheroverwhetherIcanwatchTVafterschool.Sheholdsviewthatseniorthreestudentshavetomakefullyuseofeveryminutetoworkhardattheirlessons. ItseemstomethatonceIamallowedtodothatI'llunabletocontrolmyselfandforgetallaboutmystudy.Shealsothinksitisbadformyeye.ButIreallycan'tacceptherideas.InmyopinionwatchTVcansetmymindatrestafteraday'shardworks.Besidesitisimportantforustoknowwhathadhappenedathomeandatabroad.Thusweshouldn'tbeforbiddentowatchTV.
进食可刺激小肠K细胞分泌多肽GIPGIP可作用于胰岛细胞和脂肪细胞其作用机制如图所示1~4代表细胞膜上的结构. 1K细胞合成GIP的原料是. 2图中结构1~4是细胞膜上的其化学成分是.进食后GIP和胰岛素通过结构12作用于脂肪细胞促进从而降低血糖水平.血糖浓度过低时分泌增加与胰岛素相互作用共同维持血糖含量的相对稳定. 3给大鼠口服或静脉注射适量葡萄糖让二者血糖浓度变化相当.与注射相比口服后血浆胰岛素水平更其原因是. 4现有甲乙两个糖尿病患者甲体内检测出能作用于结构2的抗体此抗体还可作用于肝细胞和肌细胞等细胞表面的结构2乙体内检测出能作用于结构3的抗体.患者的抗体是由细胞产生的这两种糖尿病都属于病两个患者中通过注射胰岛素能有效控制血糖浓度的是.
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10分1Beingangrydoesn'treallysolvemuchbutwhatpeopledowhentheyfeelangryisimportant.Thegoalistocalmdownandtrytosolvewhatisbotheringyou.Thisishardforsomekidsandadultstoo.Insteadofcalmingdownsomekidsmightkeepgettingmoreandmoreupsetuntiltheyexplodelikeavolcano!2Theirangermightbesostrongthattheylosecontroloftheirtemper.Theymayactinwaysunacceptableandhurtful.Peoplemaysaythatsomeonehastroublecontrollingtheirtemper.3 Somekidsmightgetsoangrythattheyscreamattheirparentsbreaksomethingorevenworsehittheirbrothersorsisters.4Howeverit'snotOKforakidtodoanyofthosethings.Kidsdon'twanttoactinthiswaybutsometimesangryfeelingscanbehardtomanage.Sowhattodo? Wellthegoodnewsisthatkidsdon'tjusthavetokeepmakingthesamemistakesoverandoveragain.5Imagineyourtemperasapuppy小狗insideyouthatneedssometraining.Thepuppyisnotbad﹣itwillprobablyturnoutagreatdog.Itjustneedstolearnsomerulesbecauserightnowthatpuppyiscausingsomeproblemstoyou. A.Youcantrainyourtemper. B.Youdon'twanttocausetrouble. C.Kidsshouldbeallowedtoexpresstheirfeelingsevenangryones. D.Everybodygetsangrysometimes. E.Infacttheyusuallymeanthatakidbehavesbadlywhenfeelingangry. F.Insteadofthinkingofthepersonyou'reangrywiththinkofsomethingelse. G.Somekidsgetangrymoreoftenormoreeasilythansomeotherkids. 1. 2. 3. 4. 5.
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30分 TheBlindBoy Ablindboysatonthestepsofabuildingwithahatbyhisfeet.Heheldupa1whichsaidIamblindpleasehelp.Therewereonlyafew2inthehat. Amanwaswalkingby.Hetookafewcoinsfromhis3anddroppedthemintothehat.He4tookthesignturneditaroundandwrotesomewords.He5thesign6everyonewhowalkedbywouldseethenewwords. Soonthehatbeganto7.Alotmorepeopleweregivingmoneytotheblindboy. Thatafternoonthemanwhohad8thesigncametosee9thingswere.Theboy10hisfootstepsandaskedWereyoutheonewhochangedmysignthismorning?Whatdidyouwrite? ThemansaidIonlywrotethetruth.Isaidwhatyousaidinadifferentway11.WhathehadwrittenwasTodayisan12dayandIcannotseeit. Doyouthinkthefirstsignandthesecondsignweresayingthesamething? 13bothsignstoldpeopletheboywasblind.Butthefirstsignsimplysaidtheboywasblind.Thesecondsigntoldpeopletheywereso14thattheywerenotblind. Shouldwebesurprisedthatthesecondsignwasmore15? Bethankfulforwhatyouhave.16lifegivesyoua100reasonstocryshowlifethatyouhave1000reasonsto17.Faceyourpastwithoutregret.18yourpresentwithconfidence自信.Prepareforthe19withoutfear.Keepthefaithand20thefear. 1.A.cover B.sign C.board D.note 2.A.cashes B.treasures C.pennies D.coins 3.A.pocket B.can C.backpack D.case 4.A.still B.then C.already D.yet 5.A.puton B.putout C.putoff D.putback 6.A.incase B.nowthat C.sothat D.asthough 7.A.mixup B.showup C.fillup D.makeup 8.A.changed B.prepared C.supported D.reached 9.A.what B.why C.where D.how 10.A.realized B.recognized C.found D.discovered 11.A.though B.but C.yet D.still 12.A.average B.successful C.harmonious D.beautiful 13.A.Afterall B.Inthelongterm C.Ofcourse D.Asamatteroffact 14.A.happy B.disappointed C.lucky D.strange 15.A.effective B.brave C.surprising D.scientific 16.A.Once B.When C.Until D.Because 17.A.smile B.exist C.survive D.prove 18.A.Lookinto B.Searchfor C.Dealwith D.Dependon 19.A.tomorrow B.adventure C.future D.sunrise 20.A.preserve B.charge C.skip D.drop
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8分Themanagerofasmallbuildingcompanywasverysurprisedtogetabillfortwowhitemicewhichoneofhisworkmenhadbought.Hesentfortheworkmanandaskedhimwhyhehadhadthebillsenttothecompany. Wellheworkmananswered.yourememberthehousewewererepairinginNebraskalastweekdon'tyou?Oneofthethingswehadtodotherewastoputinsomenewelectricalwires.Wellinoneplacewehadtopasssomewiresthroughapipethirtyfeetlongandaboutaninchacrosswhichwasbuiltintosolidstoneandhadfourbigbendsinit.NoneofuscouldthinkhowtodothisuntilIhadagoodidea.Iwenttoashopandboughttwowhitemice.Oneofthemwasmaleandtheotherfemale.ThenItiedathreadtothebodyofthemalemouseandputhimintothepipeatoneend.whileBillheldthefemalemouseattheotherendandpressedhergentlytomakehersqueak尖叫.Whenthemalemouseheardthefemalemouse'ssqueaksrushedalongthepipetohelpher.Isupposehewasagentlemaneventhoughhewasonlyamouse.Anywayasheranthroughthepipepulledthethreadbehindhim.Itwasthenquiteeasyforustotieoneendofthethreadtotheelectricalwiresandpullthemthroughthepipe. 1.Whywastheworkmansentfor? A.Becausehemighthavecheatedthemanager. B.Becausehehadbrokentheruleofthecompany. C.Becausethemanagerthoughthehadsenthimawrongbill. D.Becausethemanagerwantedtopraisehisgoodwork. 2.Whatdidtheworkmanbuythetwomicefor? A.Tohelpsolvesomeproblemsintheirwork. B.Toseewhethermicecouldgothroughsomebends. C.Totestthelovebetweenthetwomice. D.Tocheckhowtheirworkwenton. 3.Howdidthetwomicehelptheworkmanout? A.Thetwomicerantoeachotherinthepipe. B.Themalemouseranwiththethreadfromoneendtotheother. C.Theworkmandrovethemalemousetosavethefemalemouse. D.Thetwomiceranthroughthepipewiththewires. 4.Whatmaybethemostpossibleendingofthestory? A.Thetwomicewerekeptaspets. B.Boththeworkmanandthemiceweredrivenaway. C.Manyotherworkmenwilldothesame. D.Thebillwasacceptedbythemanager.
25分假定你是李华你校英文报英语园地栏目拟刊登介绍中国节日风俗的短文.请写一篇短文介绍端午节向该栏目投稿.要点如下 1.端午节的起源和意义. 2.端午节的庆祝活动. 3.你的看法. 注意1.词数100左右.2.可以适当增加细节以使行文连贯. TheDragonBoatFestival
6分ItwasshortlybeforemidnightandDr.Patriciawasgettingreadyforbed.Thephonerang.Ontheotherendofthelinewasawomanabouttobreakapromise. Thewomanwashermother'sneighbor.FloraHarrishadmadetheneighborswear发誓shewouldn'ttellherdaughtershe'dhadaheartattackandwasinthehospitalforfearherdaughterwouldworry.Theneighborwiselydecidedtodisobeyorders. Harrisdesperatelywantedtogettothehospitalimmediatelybutshecouldn't.ShelivesinWashingtonD.C.andhermotherlivesinCalifornia. ForthepastyearandahalfHarrishasgonetoLosAngeleseveryothermonthtotakecareofhermother.FloraHarristakescareofherhusbandJameswho's91andhasAlzheimer'sdisease.Theyliveintheirownhomeandcaregivercomestohelpthemafewhoursaday. HarrisisoneofmanyAmericansfacingtheheartacheofhowtotakecareofagingparentsfromafar.She'softenworriednottomentionextremelybusywithademandingjobtwoteenagedaughtersandthefrequenttripstoCalifornia. InsomewaysHarrisisluckyShehastheresourcestomakethetripstoLosAngeles.PlusHarrisisadoctorwhotreatstheelderly. Butit'sstilltoughshesays.Icanforeseewhatthenextfewyearsaregoingtolooklikeandit'snotaprettypicture.Myfather'sgoingtoneeddiapers尿布.Therewillcomeatimewhenhewon'trecognizemeandhe'seasilyexcited.Iworryhe'sgoingtobeviolentandhurtmymother. Sowhatdoyoudowhenyouliveacontinentawayfromyouragingsickparents?Therearenomagicanswers.Youcanhiresomeonetohelpbutyoucan'toutsourceitcompletely. 1.Whywasthewomanthoughttohavebrokenapromise? A.ShefailedtotakecareofFlora. B.ShewasnotsupposedtocallHarrisatmidnight. C.Shecouldn'tgotohospitalontime. D.ShetoldHarrisabouthermother'sillness. 2.WhatcanwelearnaboutPatriciaHarrisfromthepassage? A.Shethinksithardertolookafterherparentsthenextfewyears. B.Herparentscannottakecareofthemselvesatall. C.Shecannotdoademandingjob. D.ShecannotaffordtogotoCaliforniaoften. 3.What'sthemainideaofthispassage? A.AgingpeopleintheUSareincreasing. B.TherateofheartdiseaseishighinAmerica. C.Itisdifficulttotakecareofagingparentsfromafar. D.Harrisadvisesonlookingafteragingparentsfromafar.
光质不同波长的光会影响叶绿素a叶绿素b对于光的吸收从而影响光合作用的光反应阶段.某生物小组为检测光质对金鱼藻光合作用强度的影响利用提供不同光源的40W的灯泡数个试管数支金鱼藻NaHCO3溶液等实验材料1小时后测定记录数据如下 注O2相对变化量+表示增加﹣表示减少 1叶绿体中色素的功能是.实验中加入NaHCO3溶液的作用是无关变量有.至少写2个 2在绿光条件下金鱼藻叶肉细胞产生ATP的场所有消耗[H]的场所是. 3如图为叶绿素a和叶绿素b的吸收光谱暗带部分表示被吸收的光线已知在漫射光环境中光线以较短波长的光占优势与阳生植物相比推测阴生植物叶绿体中色素含量较高. 4在红光条件下该植物经过2小时光合作用产生氧气总量相对值是. 5根据实验结果推测在大棚种菜时为提高产量需要用的玻璃.
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柑橘果实色香味兼优既可鲜食也可加工成果汁果酒果醋等各种食品.柑橘类的果皮中富含柑橘精油无色透明具有诱人的橘香味是天然香料精油中的一大类在食品以及化妆品行业具有广泛的应用价值.请回答下列相关问题. 1柑橘精油提取 ①为了避免原料发生焦糊有效成分水解等问题橘皮精油的提取一般采用法. ②提取橘皮精油首先要用浸泡原料这是因为石灰水能够破坏细胞结构分解果胶防止橘皮压榨时滑脱提高. ③初步得到橘皮精油后还要分别加入0.25%的小苏打和5%的硫酸钠并调节pH至7~8这样处理的目的是. 2柑橘果酒和果醋制作 ①发酵罐1和发酵罐2中的微生物在结构上的主要区别是前者. ②发酵罐1过程完成后可以用检测发酵产物中是否有酒精产生.若要进一步检测所得果酒中酵母菌的密度可采用法. ③某同学尝试用罐头瓶制作果酒在培养过程中每隔12h左右将瓶盖拧松一次此后再拧紧这样做的主要目的.
8分TheChineseinventedpaperin105A.D.Theymixedthebarkofatreeandrags破布withwaterputascreenintothemixtureandliftedoutathinpieceofwetpaper.Theydriedthepaperinthesun. TheChinesekepttheirsecretofhowtomakepaperuntilawarwithMuslimsintheninthcentury.TheartofpapermakingsoonspreadthroughouttheMuslimworld. TheMayanIndiansinCentralAmericaandPacificIslandersalsodiscoveredhowtomakepaperbuttheirknowledgeneverspreadtotherestoftheworld. Forcenturiesallpaperwasmadebyhand.Ragswerethemainmaterial.ThenaFrenchscientistdiscoveredthatpeoplecouldmakepaperfromwoodtoo.Finallyintheeighteenthcentury.aFrenchmaninventedamachinetomakepaperfromwood. 1.Whodiscoveredhowtomakepaper? A.TheChinese. B.ThePacificIslanders. C.TheMayanIndians. D.Alloftheabove. 2.WhendidtheChineseinventpaperaccordingtothepassage? A.About1800yearsago. B.About1900yearsago. C.About2000yearsago. D.About2100yearsago. 3.HowwaspapermakingintroducedintotherestoftheworldfromChina? A.Throughwars. B.ThroughtheMuslims. C.ThroughtheMayanIndians. D.ThroughthePacificIslanders. 4.Whichofthefollowingisthebesttitleforthispassage? A.TheInventionofPaper. B.TheHistoryofPapermaking. C.DifferentWaysofMakingPaper. D.TheInventionofaPapermakingMachine.
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