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已知椭圆的离心率为，以该椭圆上的点和椭圆的左、右焦点F1，F2为顶点的三角形的周长为．（1）求椭圆C的标准方程；（2）设该椭圆C与y轴的交点为M，N（点M位于点N的上方），直线y＝kx+4与椭圆C相...
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高三上学期数学《》真题及答案
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已知椭圆+=1a>b>0点A.B1B2F.依次为其左顶点下顶点上顶点和右焦点若直线AB2与直线B1F
已知点F1F2是椭圆＋＝1a>b>0的左右焦点在此椭圆上存在点P.使∠F1PF2＝60°且|PF1|
已知椭圆的左焦点O.为坐标原点点P.在椭圆上点Q.在椭圆的右准线上若则椭圆的离心率为.
设椭圆的左右焦点分别为F1F2右顶点为A上定点为B已知 求椭圆的离心率
已知椭圆中心在原点焦点在x轴上离心率点F1F2分别为椭圆的左右焦点过右焦点F2且垂直于长轴的弦长为1
已知椭圆C.=1a＞b＞0的离心率为且经过点1F1F2是椭圆的左右焦点.1求椭圆C.的方程2点P.在
已知A.－20B.20为椭圆C.的左右顶点F.为其右焦点P.是椭圆C.上异于A.B.的动点且△APB
已知椭圆的左右焦点分别为F.1F.2点P.为椭圆上一点且∠PF1F.2=30°∠PF2F.1=60°
以椭圆的右焦点F.2为圆心的圆恰好过椭圆的中心交椭圆于点M.N.椭圆的左焦点为F.1且直线MF1与此
如图已知椭圆＝1a>b>0F1F2分别为椭圆的左右焦点A.为椭圆的上顶点直线AF2交椭圆于另一点B.
如图已知F1为椭圆的左焦点A.B.分别为椭圆的右顶点和上顶点P.为椭圆上的点.若PF1⊥F1APO∥
已知F1F2是椭圆＋＝1a>b>0的左右焦点A.是椭圆上位于第一象限内的一点若＝0椭圆的离心率等于△
已知F1F2是椭圆C.的左右焦点点P.在椭圆上且满足PF1＝2PF2∠PF1F2＝30°则椭圆的离心
已知椭圆+=1a>b>0的左右焦点分别为F1-c0F2c0.若椭圆上存在点P.使得=则该椭圆的离心率
已知F1F2分别是椭圆C.的左右焦点点P.在椭圆上且满足PF1=2PF2∠PF1F2=30°则椭圆的
设椭圆的左右焦点分别为F1F2右顶点为A上定点为B已知 设P为椭圆上异于其顶点的一点以线段
已知椭圆的右焦点为F.右准线与x轴的交点为D.在椭圆上一点P.使得则该椭圆的离心率为.
如图已知椭圆＝1a>b>0的左焦点为F.右顶点为A.点B.在椭圆上且BF⊥x轴直线AB交y轴于点P.
已知有公共焦点的椭圆与双曲线的中心为原点焦点在x轴上左右焦点分别为F.1F.2且它们在第一象限的交点
已知F.1F2是椭圆a>b>0的左右两个焦点A.是椭圆上一点△AF1F2的周长为10椭圆的离心率为1
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碳氮硫是中学化学重要的非金属元素在工农业生产中有广泛的应用． 1用于发射“天宫一号”的长征二号火箭的燃料是液态偏二甲肼CH32N﹣NH2氧化剂是液态四氧化二氮．二者在反应过程中放出大量能量同时生成无毒无污染的气体．已知室温下1g燃料完全燃烧释放出的能量为42.5kJ请写出该反应的热化学方程式． 2298K时在2L的密闭容器中发生可逆反应2NO2g⇌N2O4g△H＝﹣akJ•mol﹣1a＞0．N2O4的物质的量浓度随时间变化如图1．达平衡时N2O4的浓度为NO2的2倍回答下列问题． ①298k时该反应的平衡常数为． ②在温度为T1T2时平衡体系中NO2的体积分数随压强变化曲线如图2所示．下列说法正确的是 a．AC两点的反应速率A＞C b．BC两点的气体的平均相对分子质量B＜C c．AC两点气体的颜色A深C浅 d．由状态B到状态A可以用加热的方法 ③若反应在398K进行某时刻测得nNO2＝0.6molnN2O4＝1.2mol则此时V正V逆填“＞”“＜”或“＝”． 3NH4HSO4在分析试剂医药电子工业中用途广泛．现向100mL0.1mol•L﹣1NH4HSO4溶液中滴加0.1mol•L﹣1NaOH溶液得到的溶液pH与NaOH溶液体积的关系曲线如图3所示．试分析图中abcde五个点 ①水的电离程度最大的是 ②其溶液中cOH﹣的数值最接近NH3•H2O的电离常数K数值的是 ③在c点溶液中各离子浓度由大到小的排列顺序是．
下列离子方程式正确的是
锌是一种应用广泛的金属目前工业上主要采用湿法工艺冶炼锌某含锌矿的主要成分为ZnS还含少量FeS等其他成分以其为原料冶炼锌的工艺流程如图所示回答下列问题1硫化锌精矿的焙烧在氧气气氛的沸腾炉中进行所产生焙砂的主要成分的化学式为．2焙烧过程中产生的含尘烟气可净化制酸该酸可用于后续的操作．3浸出液净化过程中加入的主要物质为其作用是．4电解沉积过程中的阴极采用铝板阳极采用Pb﹣Ag合金惰性电极阳极逸出的气是．5改进的锌冶炼工艺采用了氧压酸浸的全湿法流程既省略了易导致空气污染的焙烧过程又可获得一种有工业价值的非金属单质．氧压酸浸中发生主要反应的离子方程式为．6我国古代曾采用火法工艺冶炼锌明代宋应星著的天工开物中有关于升炼倭铅的记载炉甘石十斤装载入一泥罐内然后逐层用煤炭饼垫盛其底铺薪发火煅红冷淀毁罐取出即倭铅也．该炼锌工艺过程主要反应的化学方程式为．注炉甘石的主要成分为碳酸锌倭铅是指金属锌
Hundredsofpeoplehaveformedimpressionsofyouthroughthatlittledevice装置onyourdesk.Andthey'veneveractually41you.Everythingtheyknowaboutyou42throughthisdevicesometimesfromhundredsofmilesaway.43heyfeeltheycanknowyou44fromthesoundofyourvoice.That'showpowerfulthe45is.Powerfulyesbutnotalways46.ForyearsIdealtwithmytravelagentonlybyphone.RanimyfacelessagentwhomI'dnevermet47gotmerock﹣bottompricesonairfarescarsandhotels.Buthercoldvoicereally48me.Isometimeswishedto49anotheragent.OnemorningIhadto50animmediateflighthomeforafamilyemergency.IranintoRani'soffice51.Thewomansittingatthedesk52mymadnesssympatheticallyjumpedup.Shegavemea53smilenoddedwhilelisteningpatientlyandthenprintedoutthe54immediately.'Whatawonderfullady!'Ithought.Rushingout55Icalledoutovermyshoulder'Bythewaywhat'syourname?''I'mRani'shesaid.Iturnedaroundandsawa56womanwithabigsmileonherfacewavingtowishmeasafetrip.Iwas57!WhyhadIthoughtshewascold?Raniwaswellso58.SittingbackinthecaronthewaytotheairportIfigureditallout.Rani's59﹣﹣﹣herwarmsmilehernodsher‘I'mhereforyou'60﹣﹣﹣wereallsilentsignalsthatdidn'ttravelthroughwires.41.A.accepted B.noticed C.heard D.met42.A.came B.moved C.ran D.developed43.A.Thus B.Yet C.Then D.Indeed44.A.rather B.also C.just D.already45.A.Telephone B.voice C.connection D.impression46.A.direct B.useful C.easy D.accurate47.A.inperson B.bymyself C.inpublic D.onpurpose48.A.annoyed B.interested C.discouraged D.confused49.A.promote B.train C.find D.know50.A.arrange B.postpone C.confirm D.book51.A.forthefirsttime B.atanytime C.fromtimetotime D.ingoodtime52.A.expecting B.seeing C.testing D.avoiding53.A.shy B.comforting C.familiar D.forced54.A.bill B.form C.ticket D.list55.A.hopefully B.disappointedly C.gratefully D.regretfully56.A.careful B.serious C.nervous D.pleasant57.A.amused B.worried C.helpless D.speechless58.A.calm B.nice C.proud D.clever59.A.forgiveness B.eagerness C.friendliness D.skillfulness60.A.explanation B.attitude C.concept D.Behavior
下列叙述错误的是
可持续发展需要注意“环境保护”和“节约能源”． ①近年来一些国家为治理“白色污染”提出3R运动即要求做到废弃塑料的减量化再利用和． ②某污水处理厂处理含酸性物质泥沙等的污水时常先加入混凝剂经曝气沉砂后再加入熟石灰处理加入熟石灰的目的是． ③汽车尾气的大量排放会引起环境污染写出NO和CO在催化剂作用下转化为无污染的两种气体的化学方程式．
邻羟基苯甲酸的结构简式为俗名水杨酸．水杨酸属于
在透明酸性溶液中能大量共存的离子组是
AnewcollectionofphotosbringsanunsuccessfulAntarcticvoyagebacktolife.FrankHurley'spictureswouldbeoutstanding﹣﹣﹣﹣undoubtedlyfirst﹣ratephoto﹣journalism﹣﹣﹣iftheyhadbeenmadelastweek.Infacttheywereshotfrom1914through1916mostofthemafteradisastrousshipwreck海难byacameramanwhohadnoreasonableexpectationofsurvival.Manyoftheimageswerestoredinanicechestunderfreezingwaterinthedamagedwoodenship.TheshipwastheEnduranceasmalltightNorwegian﹣builtthree﹣masterthatwasintendedtotakeSirErnestShackletonandasmallcrewofseamenandscientists27meninalltothesouthernmostshoreofAntarctica'sWeddellSea.FromthatpointShackletonwantedtoforceapassagebydogsled雪橇acrossthecontinent.ThejourneywasintendedtoachievemorethanwhatCaptainRobertFalconScotthaddone.CaptainScotthadreachedtheSouthPoleearlyin1912buthaddiedwithhisfourcompanionsonthemarchback.AswriterCarolineAlexandermakesclearinherforcefulandwell﹣researchedstoryTheEnduranceadventuringwaseventhenathoroughlycommercialeffort.Scott'slastjourneycompletedasbelayinatentdyingofcoldandhungercaughttheworld'simaginationandafilmmadeinhishonordrewcrowds.ShackletonaonetimeBritishmerchant﹣navyofficerwhohadgottowithin100milesoftheSouthPolein1908startedabusinessbeforehis1914voyagetomakemoneyfrommovieandstillphotography.FrankHurleyaconfidentandgiftedAustralianphotographerwhoknewtheAntarcticwashiredtomaketheimagesmostofwhichhaveneverbeforebeenpublished.33.WhatdoweknowaboutthephotostakenbyHurley?A.TheyweremadelastweekB.TheyshowedunderseasceneriesC.TheywerefoundbyacameramanD.Theyrecordedadisastrousadventure34.WhoreachedtheSouthPolefirstaccordingtothetext?A.FrankHurleyB.ErnestShackletonC.RobertFalconScottD.CarolineAlexander35.WhatdoesAlexanderthinkwasthepurposeofthe1914voyage?A.ArtisticcreationB.ScientificresearchC.MoneymakingD.Treasurehunting.
What'sOn?ElectricUnderground7.30pm﹣1.00amFreeattheCyclopsTheatreDoyouknowwho'splayinginyourarea?We'rebringingyouaneveningofliverockandpopmusicfromthebestlocalbands.Areyouinterestedinbecomingamusicianandgettingarecordingcontract合同?Ifsocomeearlytothetalkat7.30pmbyJulesSkyeasuccessfulrecordproducer.He'sgoingtotalkabouthowyoucanfindtherightpersontoproduceyoumusic.GeeWhizz8.30pm﹣10.30pmComedyatKaleidoscopeComeandseeGeeWhizzperform.He'sthefunnieststand﹣upcomedianonthecomedyscene.Thisjoyfulshowwillpleaseeveryonefromtheyoungesttotheoldest.GeeWhizzreallyknowshowtomakeyoulaugh!Ourbarisopenfrom7.00pmfordrinksandsnacks快餐.Simon'sWorkshop5.00pm﹣7.30pmWednesdaysatVictoriaStageThisisagoodchanceforanyonewhowantstolearnhowtodocomedy.Theworkshoplooksateverykindofcomedyandpracticesmanydifferentwaysofmakingpeoplelaugh.Simonisacomedianandactorwhohas10years'experienceofteachingcomedy.Hisworkshopsareexcitingandfun.AneveningwithSimonwillgiveyoutheconfidencetobefunny.CharlotteStone8.00pm﹣11.00pmPizzaWorldFinefoodwithbeautifuljazzmusicthisisagreateveningout.CharlotteStonewillperformsongsfromhernewbest﹣sellingCDwithJamesPickeringonthepiano.ThemenuisItalianwithexcellentmeatandfreshfishpizzasandpasta面食.Bookearlytogetatable.Ourbarisopenalldayandservescocktailscoffeebeerandwhitewine.21.Whocanhelpyouifyouwanttohaveyourmusicproduced?A.JulesSkye.B.GeeWhizz.C.CharlotteStone.D.JamesPickering.22.Atwhichplacecanpeopleofdifferentagesenjoyagoodlaugh?A.TheCyclopsTheatreB.KaleidoscopeC.VictoriaStageD.PizzaWorld23.WhatdoweknowaboutSimon'sWorkshop?A.Itrequiresmembershipstatus.B.Itlaststhreehourseachtime.C.Itisrunbyacomedyclub.D.ItisheldeveryWednesday.24.WhenwillCharlotteStoneperformhersongs?A.5.00pm﹣7.30pm.B.7.30pm﹣1.00am.C.8.00pm﹣11.00pm.D.8.30pm﹣10.30pm.
假定你是李华你校摄影俱乐部photographyclub将举办国际中学摄影展.请给你的英国朋友Peter写封信.请他提供作品.信的内容包括 1.主题环境保护 2.展览时间 3.投稿邮箱intlphotoshow@gmschool.com. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
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. 删除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. Thesummerholidayiscoming.MyclassmatesandIaretalkingabouthowtododuringtheholiday.Wecanchosebetweenstayingathomeandtakeatrip.Ifwestayathomeitiscomfortablebutthereisnoneedtospendmoney.Butinthatcasewewilllearnlittleaboutworld.Ifwegoonatripabroadwecanbroadenyouviewandgainknowledgeswecannotgetfrombooks.Someclassmatessuggestwecangotoplacesofinterestnearby.Ithoughtthatitisagoodidea.Itdoesnotcostmanyyetwecanstilllearnalot.
Ifyoufeelstressedbyresponsibilitiesatworkyoushouldtakeastepbackandidentify识别thoseof61greatandlessimportance.Thenhandlethemostimportanttasksfirstsoyou'llfeelarealsenseof62achieve.Leavingthelessimportantthingsuntiltomorrow63beoftenacceptable.Mostofusaremorefocused64ourtasksinthemorningthanwearelaterintheday.Sogetanearlystartandtrytobeasproductive65possiblebeforelunch.Thiswillgiveyoutheconfidenceyouneedtogetyouthroughtheafternoonandgohomefeelingaccomplished.Recent66studyshowthatwearefarmoreproductiveatworkifwetakeshortbreaks67regular.Giveyourbodyandbrainarestbysteppingoutsidefor68whileexercisingordoingsomethingyouenjoy.Ifyoufindsomethingyoulovedoingoutsideoftheofficeyou'llbelesslikely69bringyourworkhome.Itcouldbeanything﹣gardeningcookingmusicsports﹣butwhateveritis70makesureit'sarelieffromdailystressratherthananotherthingtoworryabout.
下列实验方法能达到实验目的是
InaclassthispastDecemberafterIwrotesomedirectionsontheboardforstudentsabouttheirfinalexaminationoneyoungwomanquicklytookapictureoftheboardusinghersmartphone.WhenIlookedinherdirectionsheapologized'Sorry.Wasitwrongtotakeapicture?''Ican'treadmyownhandwriting'theyoungwomanexplained.'It'sbestifItakeapictureofyourwritingsoIcanunderstandthenotes.'Thatremarkstartedaclass﹣wideconversationabouttakingapictureinsteadoftakingnotes.Forthoseinthephoto﹣takingcampmotivationsextendedbeyondtheirinabilitytocomprehendtheirownhandwriting.Sometookpicturesofnotesbecausetheyknewtheirphonewasasafeplacetostorematerial.Theymightlosepapertheyreasonedbuttheywouldn'tlosetheirphones.SometookphotosbecausetheywantedtorecordexactlythemannerinwhichIhadnotedinformationontheboard.Otherstoldmethatduringclasstheylikedtobeabletolistentothediscussionattentively.Yettheuseofcamerasasnotetakersthoughitmaybeconvenientdoesraisesignificantquestionsfortheclassroom.Isapictureaneffectivereplacementfortheprocessofnote﹣taking?Instructorsencouragestudentstotakenotesbecausetheactofdoingsoismorethanmerelyrecordingnecessaryinformation﹣ithelpspreparethewayforunderstanding.Encouragingstudentstotakenotesmaybeanold﹣fashionedinstructionalmethodbutjustbecauseamethodhasalonghistorydoesn'tmeanit'soutofdate.Writingthingsdownengagesastudent'sbraininlisteningvisualandkinesthetic触觉的learning﹣aviewsupportedbyalongstandingresearch.Theactofwritingdowninformationenablesapersontobegincommittingittomemoryandtoprocessandcombineitestablishingthebuildingblocksoflearningnewconcepts.Takingapicturedoesindeedrecordtheinformationbutitdeletessomeofthenecessarymentalengagementthattakingnotesemploys.Socanthetwobeequallyeffective?1Thewomanapologizedintheclassbecauseshe.A.hadthebadhandwritingB.missedtheteachers'directionsC.tookapictureoftheboardD.disturbedotherstudents'learning2Accordingtothepassagetakingnotesbyhand.A.requiresstudentstothinkindependentlyB.helpsstudentsactivelyparticipateinlearningC.provestobeanoldanduselesslearningmethodD.seemsunsuitableforstudentstolearnnewideas3Whatisthemainideaofthispassage?A.Thetraditionalwayofnote﹣takingshouldbereplaced.B.Amodernwayofnote﹣takingiscatchingon.C.Note﹣takingbyhandisnotoutofdate.D.Apictureisworthathousandwords.
随着生活水平的提高人们越来越关注自身的健康． ①平时我们到药店能买到的药如阿司匹林属于选填“R”或“OTC”类人体铁元素摄入量不足可能会导致室内放射性污染物被称为“隐形杀手”的物质是填名称． ②人体摄入过多的食物时会引起胃酸分泌过多使人体感到不适此时应服用消酸剂．双羟基铝酸钠NaAlOH2CO3就是一种常用的消酸剂它和胃酸反应的化学反应方程式为．
XYZW为四种短周期主族元素且原子序数依次增大．已知X的最外层电子数是其电子层数的2倍Y是地壳中含量最高的元素Y原子的最外层电子数是W原子最外层电子数的2倍Z原子最外层只有一个电子．下列说法正确的是
下列关于乙醇乙酸的说法正确的是
某研究小组用新颖的NaBH4/H2O2燃料电池模拟电化学降解NO3﹣下列说法不正确的是
“矿石熊猫”由我国地质学家首次发现它由前20号元素中的6种组成其化学式为X3Y2ZWR43T2其中XYZ为金属元素Z的最外层电子数与次外层相等XZ位于同族YZRT位于同周期R最外层电子数是次外层的3倍T无正价X与R原子序数之和是W的2倍．下列说法错误的是
菠菜营养丰富素有“蔬菜之王”的美称．民间流传菠菜豆腐同食易得结石．某化学兴趣小组对“菠菜豆腐是否不能同食”等问题进行探究． 已知菠菜含有丰富的铁草酸盐碳酸盐等豆腐中含有丰富的蛋白质及钙盐等．人体结石的主要成分草酸钙CaC2O4．醋酸不与草酸钙反应但能与碳酸钙反应生成可溶性盐等． [探究一]菠菜中部分成分分析 1步骤②中的实验室操作中需要的玻璃仪器有． 2白色沉淀B的化学式可能为． [探究二]某草酸钙晶体CaC2O4•xH2O热分解研究 按如图装置将某草酸钙晶体样品高温加热使其完全分解对所得气体产物进行探究假设装置中各试剂均足量． 3某研究所利用SDTQ600热分析仪对草酸钙晶体CaC2O4•xH2O进行热分解得相关数据绘制成固体质量﹣分解温度的关系如图． ①800℃以上时固体成分的化学式为． ②写出固体质量由12.8g变为10.0g时的反应方程式． ③计算草酸钙晶体的x写出计算过程．根据图象可知0～200℃是晶体失去结晶水的过程14.6克CaC2O4•xH2O失去水后生成12.8克CaC2O4则 CaC2O4•xH2O～CaC2O4 128+18x128 14.612.8 ＝ 解得x＝1．
以下物质间的转化能通过一步反应实现的是
利用如图所示实验装置可以测定常温常压下气体的摩尔体积．甲同学利用如图1装置根据下列步骤完成实验 ①装配好装置作气密性检查． ②用砂纸擦去镁带表面的氧化物然后取0.108g的镁带． ③取下A瓶加料口的橡皮塞用小烧杯加入20mL水再把已称量的镁带加到A瓶的底部用橡皮塞塞紧加料口． ④用注射器从A瓶加料口处抽气使B瓶导管内外液面持平． ⑤用注射器吸取10mL3mol•L﹣1硫酸溶液用针头扎进A瓶加料口橡皮塞将硫酸注入A瓶注入后迅速拔出针头． ⑥当镁带完全反应后读取C瓶中液体的体积记录数据． ⑦用注射器从A瓶加料口处抽出8.0mL气体使B瓶中导管内外液面持平． ⑧读出C瓶中液体体积是115.0mL．完成下列填空 1常温常压下的压强为温度为． 2在常温常压下气体摩尔体积理论值约为24.5L/mol甲同学测出此条件下lmol气体的体积为计算此次实验的相对误差为%＜保留2位有效数字．相对误差指的是测量所造成的绝对误差与被测量〔约定〕真值之比．乘100%所得的数值以百分数表示．引起该误差的可能原因． a．镁带中含铝b．没有除去镁带表面的氧化物c．反应放热d．所用硫酸的量不足 3丙同学提出可用如图2装置完成该实验．该装置气密性的检查方法是． 4与原方案装置相比丙同学使用的装置实验精度更高．请说明理由回答两条．
FiveyearsagowhenItaughtartataschoolinSeattleIusedTinkertoysasatestatthebeginningofatermtofindoutsomethingaboutmystudents.IputasmallsetofTinkertoysinfrontofeachstudentandsaid'MakesomethingoutoftheTinkertoys.Youhave45minutestoday﹣and45minuteseachdayfortherestoftheweek.'Afewstudentshesitatedtostart.Theywaitedtoseetherestoftheclasswoulddo.Severalotherscheckedtheinstructionsandmadesomethingaccordingtooneofthemodelplansprovided.Anothergroupbuiltsomethingoutoftheirownimaginations.OnceIhadaboywhoworkedexperimentallywithTinkertoysinhisfreetime.Hisconstructionsfilledashelfintheartclassroomandagoodpartofhisbedroomathome.Iwasdelightedatthepresenceofsuchastudent.Herewasanexceptionallycreativemindatwork.HispresencemeantthatIhadanunexpectedteachingassistantinclasswhosecreativitywouldinfect感染otherstudents.Encouragingthiskindofthinkinghasadownside.Irantheriskoflosingthosestudentswhohadadifferentstyleofthinking.Withoutfailonewoulddeclare'ButI'mjustnotcreative.''Doyoudreamatnightwhenyou'reasleep?''Ohsure.''Sotellmeoneofyourmostinterestingdreams.'Thestudentwouldtellsomethingwildlyimaginative.Flyingintheskyorinatimemachineorgrowingthreeheads.'That'sprettycreative.Whodoesthatforyou?''Nobody.Idoit.''Really﹣atnightwhenyou'reasleep?''Sure.''Trydoingitinthedaytimeinclassokay?'25.TheteacherusedTinkertoysinclassinorderto?A.knowmoreaboutthestudentsB.makethelessonsmoreexcitingC.raisethestudents'interestinartD.teachthestudentsabouttoydesign26.WhatdoweknowabouttheboymentionedinParagraph3?A.Helikedtohelphisteacher.B.Hepreferredtostudyalone.C.Hewasactiveinclass.D.Hewasimaginative.27.Whatdoestheunderlinedword'downside'inParagraph4probablymean?A.Mistake.B.Drawback.C.Difficulty.D.Burden.28.Whydidtheteacheraskthestudentstotalkabouttheirdreams?A.Tohelpthemtoseetheircreativity.B.Tofindoutabouttheirsleepinghabits.C.Tohelpthemtoimprovetheirmemory.D.Tofindoutabouttheirwaysofthinking.
某溶液除水电离出的HO﹣H+之外仅含Fe2+Na+Al3+Ba2+SO42﹣NO3﹣Cl﹣中的4种这4种离子的物质的量均为0.1mol．若向该溶液中加入少量稀硫酸无沉淀生成但有气泡产生．下列说法错误的是
用NA表示阿伏加德罗常数的值下列说法正确的是
下列物质中只含有共价键的是
放射性同位素Ho的原子核内中子数与电子数之差是
Readingcanbeasocialactivity.Thinkofthepeoplewhobelongtobookgroups.Theychoosebookstoreadandthenmeettodiscussthem.NowthewebsiteBookCrossing.comBookCrossing.comturnsthepageonthetraditionalideaofabookgroup.Membersgoonthesiteandregisterthebookstheyownandwouldliketoshare.BookCrossingprovidesanidentificationnumbertostickinsidethebook.Thenthepersonleavesitinapublicplacehopingthatthebookwillhaveanadventuretravelingfarandwidewitheachnewreaderwhofindsit.BrucePedersonthemanagingdirectorofBookCrossingsays'Thetwothingsthatchangeyourlifearethepeopleyoumeetandbooksyouread.BookCrossingcombinesboth.'Membersleavebooksonparkbenchesandbusesintrainstationsandcoffeeshops.Whoeverfindstheirbookwillgotothesiteandrecordwheretheyfoundit.Peoplewhofindabookcanalsoleaveajournalentrydescribingwhattheythoughtofit.E﹣mailsarethensenttotheBookCrossingtokeepthemupdatedaboutwheretheirbookshavebeenfound.Brucepetersonsaystheideaisforpeoplenottobeselfishbykeepingabooktogatherdustonashelfathome.BookCrossingispartofatrendamongpeoplewhowanttogetbacktothe'real'andnotthevirtual虚拟.Thesitenowhasmorethanonemillionmembersinmorethanonehundredthirty﹣fivecountries.29.Whydoestheauthormentionbookgroupsinthefirstparagraph?A.Toexplainwhattheyare.B.TointroduceBookCrossing.C.Tostresstheimportanceofreading.D.Toencouragereaderstosharetheirideas.30.Whatdoestheunderlinedword'it'inParagraph2referto?A.Thebook.B.Anadventure.C.Apublicplace.D.Theidentificationnumber.31.WhatwillaBookCrosserdowithabookafterreadingit?A.Meetotherreaderstodiscussit.B.Keepitsafeinhisbookcase.C.Passitontoanotherreader.D.Mailitbacktoitsowner.32.Whatisthebesttitleforthetext?A.OnlineReadingAVirtualTourB.ElectronicBooksAnewTrendC.ABookGroupBringsTraditionBackD.AWebsiteLinksPeoplethroughBooks.
Agardenthat'sjustrightforyouHaveyouevervisitedagardenthatseemedjustrightforyouwheretheatmosphereofthegardenappearedtototalmorethanthesum总和ofitsparts?36.Butitdoesn'thappenbyaccident.Itstartswithlookinginsideyourselfandunderstandingwhoyouarewithrespecttothenaturalworldandhowyouapproachthegardeningprocess.●37Somepeoplemaythinkthatagardenisnomorethanplantsflowerspatternsandmassesofcolor.Othersareconcernedaboutusinggardeningmethodsthatrequirelesswaterandfewerfertilizers肥料.38.Howeverthereareanumberofotherreasonsthatmightexplainwhyyouwanttogarden.Oneofthemcomesfromourearliestyears.●Recall回忆yourchildhoodmemoriesOurmodelofwhatagardenshouldbeoftengoesbacktochildhood.Grandma'srosegardenandDad'svegetablegardenmightbegoodorbadbutthat'snotwhat'simportant.39﹣﹣howbeinginthosegardensmadeusfeel.Ifyou'dliketobuildapowerfulbondwithyourgardenstartbytakingsometimetorecallthegardensofyouryouth.40thengooutsideandworkoutaplantotranslateyourchildhoodmemoriesintoyourgrown﹣upgarden.Havefun.A.KnowwhyyougardenB.FindagoodplaceforyourowngardenC.It'sourexperienceofthegardenthatmattersD.It'sdelightfultoseesomanybeautifulflowersE.StillothersmaysimplyenjoybeingoutdoorsandclosetoplantsF.YoucanproducethatkindofmagicalqualityinyourowngardentooG.Foreachofthosegardenswriterdownthestrongestmemoryyouhave.
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