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按要求解下列方程：4（x+1）2=（用直接开平方法）
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用直接开平方法解下列方程3x-22=147．
用直接开平方法解下列一元二次方程其中无解的方程为
x
2
﹣1=0
x
2
=0
x
2
+4=0
﹣x
2
+3=0
用直接开平方法解下列方程x2=63．
用直接开平方法解下列方程3x-23x+2=8
用直接开平方法解下列方程 4x-32-25=0
用直接开平方法解下列方程81x－22＝16
解下列方程①2x2－18＝0②9x2－12x－1＝0③3x2＋10x＋2＝0④25x－12＝25x－
①直接开平方法，②配方法，③公式法，④因式分解法
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①直接开平方法，②、③公式法，④因式分解法
用直接开平方法解下列方程x2+6x+9=7
用直接开平方法解下列方程 2x-12=2
解下列方程2x-12=7用直接开平方法
按要求解下列方程83-x2-72=0直接开平方法
用直接开平方法解下列方程1x2－
用直接开平方法解下列方程
用直接开平方法解下列方程
用直接开平方法解下列方程.
用直接开平方法解下列方程27=4x2
用直接开平方法解下列方程5-2x²=9x+3²
用直接开平方法解下列方程 -4x2=-9
用直接开平方法解下列方程x2=36．
用直接开平方法解下列方程92x-12-8=0．
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曾经有一种固氮的方法1100°C通N2和CaC2反应得到CaCN2．已知CaCN2+3H2O＝2NH3↑+CaCO3↓ 1某同学采用图1装置加热和夹持仪器已略去制取少量的CaCN2 ①U形管中盛放的物质是填一种其作用是 ②填“能”或“不能”用普通玻璃管代替图中石英管 2检验反应后的固体用W表示中含有氮元素该同学将适量W溶于水有气泡产生说明固体中含有氮元素该结论不正确．若要得出正确结论还需进行的实验是． 3测定W中CaCN2的质量分数 步骤Ⅰ按图2所示装置夹持仪器已略去进行实验关闭弹簧夹将漏斗中溶液逐滴加入到三颈瓶中当W反应完全后打开弹簧夹通入氮气直至氨气被200mL0.1mol•L﹣1硫酸完全吸收． 步骤Ⅱ准确量取烧杯中溶液20.00mL置于锥形瓶中滴入几滴指示剂用cmol•L﹣1NaOH溶液滴定过量的硫酸实验测得消耗标准溶液的平均体积为vmL． 已知三种常用指示剂变色pH范围如下 ①上述滴定过程中不宜选用的指示剂是填字母序号 ②三颈瓶中除了发生生成氨气的反应还有用化学方程式表示烧杯中最终吸收氨气的物质的量为mol经进一步计算可求得W中CaCN2质量分数． ③上述实验所得结果明显偏小若不考虑装置的气密性和操作误差则导致结果偏小的可能原因是写1种．
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Astudentdoesnotknowanyoftheanswersonatest.Allthequestionsontheanswerpageareunfamiliartohimandwhentheresultscomebackthestudentrealizesthathehasfailed.1.Bycopyingtheworkofothershecanruinhisgradeaswellashisfuture. Mostpeoplehavecheatedatleastonceintheirliveswhetheritwasformissedorincompleteworkorevenjustforcredit分数thattheydidn'tdeserve.2.Itshowslessresponsibilityaswellaslessknowledge.Forexampleifastudentcheatsusingaclassmate'sexampaperheistakingcreditforanother'swork.Iftheteachercatcheshimtheconsequence后果isusuallyfailure. Cheatingbyusingtheworkofothersisthesameasruiningyourlifewithdrugs.Ifastudentcontinuescheatingthenitmaybecomeahabitinthefuture.3.Weallhavebrainsthatwecanuseandalsoourteachersandparentscanhelpus. 4.Inthebeginningwhenthestudentisinprimaryschoolcheatingmayonlyleadtolosingcredit.Inmiddleschooltherewillbeparent﹣teacherconferences.Butinhighschoolcollegeandtherestofaperson'slifecheatingwillnotbeignored. Ofallthingstakingcreditforotherpeople'sworkisnotonlyunnecessarybutquiteunreasonableaswell.Ifwealljustdoourworkthenthereisnoneedtocheat.5. A.Buttakingtheworkofothersandusingitasyourownisnottherightthingtodo. B.Theycanjusttelltheirparentsthetruth. C.Thisisthesituationforthosewhocopytheirhomeworkfromothers. D.Thereisnoneedtoruinbothyourhealthandyourmind. E.Besidesnooneneedstocheat. F.Peoplewhocheatusuallyhavetofacetheconsequences. G.Weshouldmakeaneffortduringoureducationinsteadoftakingtheeasywayout. 1. 2. 3. 4. 5.
某一部件由四个电子元件按如图方式连接而成元件1或元件2正常工作且元件3或元件4正常工作则部件正常工作．设四个电子元件的使用寿命单位小时均服从正态分布N1000502且各个元件能否正常工作相互独立那么该部件的使用寿命超过1000小时的概率为．
8分Myfirstchildwasbornin1986andtwoandahalfyearslaterIhadmydaughter.AllIeverdidfromthenonwastakingcareofkidsandourhome.ThroughoutthoseearlyyearswheneverIwentsomewhereandwasaroundotheradultsIwouldbeaskedwhatIdid.FartoomanypeoplehadthesamereactionwhenItoldthemIwasastayathomemom.ItmademeveryangryatsuchtypeofresponseasOhyoureallydon'tdoanything.IworkedhardasamomandItookmyjobveryseriously!Raisingchildrenisdoingsomethingandisextremelyimportant. Sothat'swhenIdecidedtofindawaytodealwiththeseignorantpeopleandtoboostmyselfesteem自尊atthesametime.Onmanyofthesocialoccasionssomeoftheprofessionalwomenwouldgivemetheirbusinesscardasiftoshowmethattheyactuallydidsomethingandhadsomeimportanttitle.Idecidedtogivemyselfaveryimpressiveimportantsoundingtitleandthenmakeupabusinesscardtohandout. IthoughtaboutwhatIactuallydidasamomoverthenextfewdays.ItookspecialcaretomakesureIwasgivingmychildrenthebestcareinstructionandinformationIpossiblycould.Itwasmyjobtoteachmykidshowtospeakhowtoeathowtodresshowtogetalongwithothersandsoon.Ispecializedintheacademic学业的socialandemotionaldevelopmentofhumanbeings﹣mykids!AfterreadingmybriefoverviewofmyownjobIcameupwithmynewimpressivetitleHumanDevelopmentSpecialist. AteveryopportunityIhandedoutmycard.99.99%ofthetimepeoplewereobviouslyimpressed!Itreallymademefeelbetter.MostpeoplemadeaguessatwhataHumanDevelopmentSpecialistisordoesandIjustletthemthinkwhatevertheywantedto. 1.Wecanlearnfromthefirstparagraphthatthewriter. A.hadagoodjobbeforeshehadchildren B.inheropinionlookingafterchildrenathomeisofgreatimportance. C.couldn'tfindasatisfyingjob D.didn'tknowhowtogetonwithotherwomen 2.Whatdidthewriterdotoimproveherselfesteem? A.Shemadeherselfabusinesscard. B.Shepretendedtohaveagoodjob. C.Shestartedabusinessathome. D.Shetoldothershowshewasignored. 3.Whatwasotherpeople'sreactiontothewriter'stitle? A.Mostofthemfeltproud. B.Mostofthemwereexcited. C.Mostofthemweredisappointed. D.Mostofthemwereimpressedandpuzzled. 4.Whatwouldbethebesttitleforthepassage? A.FamilyIsMoreImportantThanWork B.BeingaMomMeansGivingupManyThings C.BeingaFulltimeMomIsImportant D.PeopleHaveEqualRights
LastyearmybrotherandIwenttoMiamiforavacation.Someofmyfriendswhohadbeentherebeforesaid1wasawonderfulholidaydestination.Beforewewentwehadplannedformonths.Whenthedaycamewewereready. Afterourplanelandedwewenttothehotel.Wehadmadeourreservation预定sixmonths2earlybutthemanatthefrontdesksaidtherehadbeenamistake.We3tellthatourroomshadn'tbeenreservedforthatweek4fortheweekafter.Ididn'tunderstand5thiswouldhappenandmycreditcardhadalreadybeencharged6thereservation.What'sworsethehotelhadbeenfullybooked.Whenwewerewonderingwhattodooutcamethemanager7wassurprisinglyhelpful.SheapologizedforthemistakeandgaveusaspareVIProomon8topfloor.Wehadneverstayedinsuchan9amazeroomandweweren'tchargedextra. ThenextdaymybrotherandIwenttothebeach10wewatchedsomepeopleplayvolleyball.Wegotalittlesunburntbutthedayhadbeensorelaxingthatwedidn'tmind. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
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In1978Iwas18andwasworkingasanurseinasmalltownabout270kmsawayfromSydneyAustralia.Iwaslookingforwardtohavingfivedaysofffromduty.UnfortunatelytheonlyonetrainadaybacktomyhomeinSydneyhadalreadyleft.SoIthoughtI'dhitcharide. Iwaitedbythesideofthehighwayforthreehoursbutnoonestoppedforme.FinallyamanwalkedoverandintroducedhimselfasGordon.Hesaidthatalthoughhecouldn'tgivemealiftIshouldcomebacktohishouseforlunch.HenoticedmestandingforhoursintheNovemberheatandthoughtImustbehungry.Iwasdoubtfulasayounggirlbutheassured使…放心meIwassafeandhealsoofferedtohelpmefindalifthomeafterwards.Whenwearrivedathishousehemadeussandwiches.Afterlunchhehelpedmefindalifthome. Twenty﹣fiveyearslaterin2003whileIwasdrivingtoanearbytownonedayIsawanelderlymanstandingintheglaringheattryingtohitcharide.IthoughtitwasanotherchancetorepaysomeoneforthefavourI'dbeengivendecadesearlier.Ipulledoverandpickedhimup.Imadehimcomfortableonthebackseatandofferedhimsomewater. AfterafewmomentsofsmalltalkthemansaidtomeYouhaven'tchangedabitevenyourredhairisstillthesame.Icouldn'trememberwhereI'dmethim.Hethentoldmehewasthemanwhohadgivenmelunchandhelpedmefindaliftallthoseyearsago.ItwasGordon. 1.Theauthorhadtohitcharideonedayin1978because. A.shemissedtheonlytrainbackhome B.thetownwasfarawayfromSydney C.shewasgoinghomeforherholidays D.herworkdelayedhertriptoSydney 2.WhichofthefollowingdidGordondoaccordingtoParagraph2? A.Hegavethegirlaridebackhome. B.Hehelpedthegirlfindaride. C.Hewatchedthegirlforthreehours. D.Heboughtsandwichesforthegirl. 3.Thereasonwhytheauthorofferedalifttotheelderlymanwasthat. A.sherealizedhewasGordon B.shehadknownhimfordecades C.shewantedtorepaythefavoursheoncegot D.shewasgoingtothenearbytown 4.Whatdoestheauthorwanttotellthereadersthroughthestory? A.Thosewhogiverideswillberepaid. B.Givingsometimesproducesniceresults. C.Goodmannersbringabouthappiness. D.Peopleshouldofferfreeridestoothers.
I'vereadlotsofstoriesaboutfamilymemories.InthosestoriesI'vefound1ofsadnessandlonging.It'struethatsomuchinourdailylivesmakesus2allthetime.Wefindourselveswithlessandlesstimetosparewithour3andfriends.I'vehadthesame4myself. Iusedtohave5timeswithmygrandfatherwhenwelivedtogether.WhenIwasveryyoungIoftenenjoyedspendingtimeinhis6watchingtheflowersandwateringthefruittrees.ButasIgrewupI7becameselfish. OncewhenIwas16wewentshoppingtogether.Aswetookthewrongbusandendedupgetting8unabletofindourwaybackIcouldn'tstay9andshoutedrudelyinhisface.Iwasso10thatIwouldn'tsaysorryafterreturninghomethinkingIhaddonenothingwrong. NowI11howridiculous荒唐的Iwasatthetime!AndIalsorealizehow12itwaswhenIfinally13Iwaswrong!WhenItrulywantedtoexpressmy14mygrandfatherhadleftusforeverleavingmewithnomore15to16mymistake.Icouldn't17saytohimthethreewords﹣﹣Iamsorry. Wearebecomingbusierandbusieroutsidewithlessandlesstimeto18withourfamiliesathome.So19thebestuseofeverysecondyouhavewithyourlovedonesbecausetime20goingwaitingfornoone. 1.A.promise B.response C.feelings D.signal 2.A.crazy B.easy C.angry D.busy 3.A.classmates B.families C.colleagues D.employers 4.A.adventure B.experience C.exploration D.research 5.A.good B.hard C.sad D.bitter 6.A.kitchen B.garage C.garden D.house 7.A.frequently B.rarely C.finally D.gradually 8.A.confused B.lost C.hurt D.puzzled 9.A.awake B.calm C.firm D.happy 10.A.stubborn B.intelligent C.fierce D.doubted 11.A.judge B.imagine C.realize D.agree 12.A.early B.late C.nice D.guilty 13.A.admitted B.appreciated C.doubted D.inspected 14.A.concern B.worry C.opinion D.regret 15.A.confidence B.chance C.evidence D.attention 16.A.careabout B.apologizefor C.thinkof D.putaway 17.A.again B.often C.even D.still 18.A.spend B.save C.take D.kill 19.A.follow B.receive C.divide D.make
Doyourememberthosetimeswhenyourmothertoldyoutoavoidtalkingtostrangers?Butnowyou'renotachildanymore.Infacttherearemanyadvantagesoftalkingtostrangers. ●Youcanmeetareallygreatperson Talkingtoastrangerisagoodhabitbecauseyouneverknowwhomyoumaymeet.1Youcanalsomeetsomeonewhowillgiveyouachancetogetyourdreamjob. ●2 Youhavesomeopinionaboutdifferentsubjectsandyouknowyourfriends'andrelatives'pointsofviewaboutthemtoo.Buttherearemillionsofotherpeoplewhothinkdifferentlyandcangiveyouunpredictableyetsmartideasthatwillbroadenyourhorizons. ●Youimproveyoursocialskills 3.Askingappropriatequestionsandattentivelisteningaretwoskillsthatmanyofusdon't have.Youcanbettertheseskillswhentalkingtoastranger. ●Youcanoffersomeonecomfort. Thethingyou'lldefinitelylikeabouttalkingtostrangersisthatyoucanmakesomeone'sdaybetter. 4.Praisepeopleandtheywillthinksomethingpleasantaboutyou.Havingasweetshortdialogueisoneofthoseperfectchancestomakepeoplecheerful. ●Youcanfindthesolutionsyoudidn'tknowabout. Talkingtosomeoneyoudon'tknowisallaboutfindingoutsomethingyoudidn'tknow.Youmayhavesomeproblemsthatyoucan'tsolveforalongtime.Howeversomeoneyousuddenlymeetcanfigureouttherightsolutionyoudidn'teventhinkaboutbefore.5 A.Smileandpeoplewillsmileinreturn. B.youcanexpandyourworldview. C.Whynotspeaktosomeoneuntilyourturncomes? D.Youshouldn'tmisstheseunexpectedchancesofmeetingpeople. E.Youcanmeetapersonwhowillbecomeyourbestfriendinthefuture. F.Itmaybeahelpyouneededtogetalongtimeago. G.Whateversocialskillsyouhaveyoucanmakethembetterwhentalkingtostrangers. 1. 2. 3. 4. 5.
已知数列{an}满足Sn＝2n﹣ann∈N+． 1计算a1a2a3a4猜想出an的表达式 2用数学归纳法证明1的猜想．
如图所示的五个区域中中心区域是一幅图画现要求在其余四个区域中涂色有四种颜色可供选择．要求每个区域只涂一种颜色相邻区域所涂颜色不同则不同的涂色方法种数为
largenumberofreportersgatheredinthehallwaitingtointerviewthestar.
下列表示正确的是
Bythetimehearrivethetrainhadalreadyleft.
将7个座位连成一排安排4个人就座恰有两个空位相邻的不同坐法有
设X为随机变量X～Bn若随机变量X的数学期望EX＝2则PX＝2等于
BestcomicbookshopsforNYCkids BLAM!POW!FestivaliscomingtotownJan.9and10atthe69thRegimentArmorywithsigningspanelsandmilesandmilesofcomicbooks.Ifyou'reafull﹣blowncomicsnerd书呆子yourselfatriptothecity'scoolestcomicbookstoreswillbeagoodchoiceasyoucountdowntothebigday. BulletproofComicsandGames Fanswillfindeverythingfromthekid﹣friendlyTinyTitansseriestothelatestissueofX﹣Men.Onweekendsfamiliescanevenjoinavideogametournamentallageswelcome. *2178NostrandAveBrooklyn ForbiddenPlanet Thisstorepacksplentyofinterstellar星际的actionStarWarsandStarTrekactionfiguresvehiclesandvariousothercollectibles收藏品competeforshelfspacewithcomicbooksandinsiderytradepaperbacks.Upstairsyoungreaderscanbrowsethroughthestore'sextensivemanga漫画andanime动漫selection. *840Broadwayat13thSt JimHanley'sUniverse Besidesthegalacticarray银河阵列ofcomicbookssuchcollectiblesasCaptainAmerica'sshieldandIronMan'shelmetattractbudding初露头角的superheroesandtheirparentstoo. *4W33rdStbetweenFifthandSixthAves SilverAgeComics NestledinacorneroftheDitmarsBoulevardsubwaystationthisstore'suniquecoollocationisextra﹣convenientforfamiliesonthemove.Plusitsentirecollectioniscataloguedonlinesoyou'llknowifthatrareissueofDoomPatrolisinstockbeforeyouheadout. *22﹣5531stStbetweenDitmarsBlvdand23rdAveAstoriaQueens MidtownComics WanttofindthebestSpider﹣Manbooktogetyourchilduptospeed?JustaskoneoftheknowledgeableblueT﹣shirtcladstaffers包层员工.Limited﹣timediscountsareavailableamongthemanEasterSundayspecial20percentoffeverything. 200W40thStbetweenSeventhandEighthAvesSeewebsitesforotherlocations. 1.Inwhichcomicbookshopcanyousavemoney? A.MidtownComics B.ForbiddenPlanet C.BulletproofComicsandGames D.JimHanley'sUniverse 2.Ifyou'reinterestedincollectiblesrelatedtoCaptainAmericayoumaygoto. A.840Broadwayat13thSt B.200W40thStbetweenSeventhandEighthAves C.2178NostrandAveBrooklyn D.4W33rdStbetweenFifthandSixthAves 3.WhatisthedifferencebetweenSilverAgeComicsandtheothercomicbookshops? A.Itissofamousforitscoollocationthatmanyfamiliesgotherebysubway. B.Itholdsactivitiesforfamiliestojoinavideogametournamentonweekends. C.Youcangetinformationaboutthebookyouwantonlinebeforegoingthere. D.YoucanfindotherlocationsofitontheInternetwithoutanydifficulty.
Imagineyourselfonaboatlookingoutatthehorizonandallyoucanseeisthewatermeetingtheskywithnolandinsightandyouaresailingstraightaheadtomeettheworld.JesseMartindoesnothavetoimagineheislivinginit. OnDec.71998at17yearsoldJessesetsailfromMelbourneAustraliaonhisboatattemptingtobecometheyoungestpersontosailaloneandnonstoparoundtheworld.HesailedsouthofNewZealandthroughtheSouthPacificaroundSouthAmericanorthontheAtlanticbacksouthpastAfricathroughtheIndianOceanandbacktoMelbourne.EvenasayoungchildJessehadbeenanadventurerwhotraveledalloverEuropeandAsiawithhisparents.BorninMunichGermanyin1981hemovedtoAustraliawithhisfamilywhenhewasonlytwoyearsold.TheymovedclosetoarainforestinCowBayabout3500kmsnorthofMelbournewheretheybuiltasmallhousewithnoelectricityorrunningwater.Jessegrewupatthebeachenjoyingtheoutdoorstoitsfullest.At14hesailedforthefirsttimewithhisfatherandbrotherBeau.Itwasafterthistripthathebegantodreamaboutsailingaroundtheworld. Jesse'sfamilyplayedanimportantrole.IwasmadetobelieveIcoulddoanythingalthoughtherewereothersthatwerenotsoencouragingorsupportivehesays.PeoplethatIlookeduptorespectedandtrustedtoldmeIcouldn't.ThankfullyItrustedmyself.Therewerepeoplethatsaidthattheboatcouldn'tbereadybythetimeIhadtoleave.Howeverthroughperseveranceandbeliefinhimselfhewasabletodowhatmanytoldhimwasimpossible. OnOct.311999morethan10monthsafterhesetsailJesseMartinwentdowninhistoryastheyoungestpersontosailaroundtheworldalonenonstopandunassisted. 1.Byencouragingreaderstoimagineasailingexperiencetheauthorwantsto. A.showhowdifficultitistobeasailor B.describewhatJesse'ssailingislike C.showhowwonderfulJesse'slifeis D.describewhatasailor'slifeislike 2.Whatcanyouknowfromparagraph2? A.Jessewasthefirstpersonwhohadsailedalonearoundtheworld. B.JessetraveledalloverEuropeandAsiawithhisparentswhenhewas17. C.JessewasborninMelbourneandgrewupatthebeach. D.Jessegrewupinasmallhousewithnoelectricityorrunningwater. 3.WhatmadeJessedecidetosailalonearoundtheworldaccordingtothepassage? A.Hischildhoodadventureexperiences. B.HisjourneystoEurope. C.Hisloveforoutdooractivities. D.Hisfirstsailingtripwithhisfamily. 4.WhatcanwelearnfromJesseMartin'sstory? A.Lifeisanunusualadventureweshouldenjoy. B.Failureisthemotherofsuccess. C.Astrongbeliefwillmakeapersonstronger. D.Greatinterestcontributestosuccess.
Idon'tencouragepeopletotakephotographslikethiswithoutpermit.
Ifyouarehungrywhatdoyoudo?Haveyourfavoritemealandstayquietafterthat?Justlikeyourstomachyourmindisalsohungry.Butitneverletsyouknowbecauseyoukeepitbusythinkingaboutyourfriendsorfavoritestars.Soitsilentlyservesyourneedsandneverletsitselfgrow.Whenmindlosesitsfreedomtogrowcreativity创造性setsafullstop.ThismightbethereasonwhyweallsometimesthinkWhathappensnext?Whycan'tIthink? Hungerofthemindcanbeactuallysolvedthroughwidereading.WhyreadingbutnotwatchingTV?Itisbecausereadinghasbeenthemosteducativetoolusedbyusrightfromchildhood.Sinceitdevelopsotherwaysofourlifewehavetotakehelpfromreading. Onceyoureadabookyourunyoureyesthroughthelinesandyourmindtriestoexplainsomethingtoyou.Theinterestingpartofthebookisstoredinyourmindasaseed种子.Nowthisseedisunknowinglyusedbyyoutodevelopnewideas.Ifitisusedmanytimesthesameseedcangiveyougreathelptorelatealotofthingswhichyouwouldhaveneverthoughtofinyourwildestdreams! Thisisnothingbutcreativity.Alsothismakesahugecontributiontoyourvocabulary.WithinnotimeyoucanstarttalkingwithyourfriendsinEnglishoranyotherlanguageandneverrunoutoftherightwords. Soguysdogivefoodforyourthoughtsbyreadingreadingandmorereading.Nowwhatareyouwaitingfor?Goandgetabook! 1.Whenyourmindishungrythebestwayis. A.thinking B.eating C.reading D.watchingTV 2.WhichofthefollowingisRIGHTaccordingtothepassage? A.Whenyoureadabookyourmindlosesitsfreedomtogrow. B.Inyourwildestdreamaseedcangrowalotofdifferentthings. C.Theinterestingpartofthebookyoureadcanhelpyoudevelopnewideas. D.WatchingTVisthemosteducativewayforustodevelopcreativityinourlife. 3.ThefollowingareadvantagesofreadingEXCEPTthat. A.readingfeedsyourhungrymind. B.readingmakescreativitysetafullstop. C.readingcanhelpyourelatealotofthings. D.readingwillcontributetoyourvocabulary. 4.What'sthepurposeofthepassage? A.Tointroduceabook. B.Topersuadeustoread. C.Toexplainhungerofmind. D.Totellushowtocreatethings.
AllI'veeverwantedisforJulieBakertoleavemealone.Forhertobackoff﹣youknowjustgivemesomespace. Itallstartedthesummerbeforesecondgradewhenourmovingvan家具搬运车pulledintoherneighborhood.Didweinvitehertogetintoourmovingvanandstartclimbingalloverboxes?No!Butthat'sexactlywhatshedidtakingoverandshowingofflikeonlyJulieBakercan. Mydadtriedtostopher.Hey!hesaidasshewasjumpingonboard.Whatareyoudoing?You'regettingdirteverywhere! Shedidn'tleavethough.Insteadsheplantedherselfonthefloorandstartedpushingabigboxwithherfeet.Don'tyouwantsomehelp?Shelookedmyway.Itsurelookslikeyouneedit. Hey!Don'tdothatmydadwarnedher.Therearesomereallyvaluablethingsinthatbox. Oh.Wellhowaboutthisone?Shemovedswiftlyovertoanotherboxandlookedmywayagain.Weshouldpushittogether! Nonono!mydadsaidthenpulledherupbythearm.Whydon'tyourunalonghome?Yourmother'sprobablywonderingwhereyouare. OhmymomknowswhereIam.Shesaiditwasfine.ThenshepointedacrossthestreetandsaidWejustliverightoverthere. Myfatherlookedtowhereshewaspointingandsighed叹息Ohboy.Thenhelookedatmeandwinked眨眼ashesaidBryceisn'tittimeforyoutogoinsideandhelpyourmother? Iknewrightoffwhatthatmeantandmanhedidn'thavetowinktwice.IsmiledandsaidSurething!thenjumpedofftheliftgateandheadedformynewfrontdoor. IheardhercomingaftermebutIcouldn'tbelieveit.Maybeitjustsoundedlikeshewasrunningaftermemaybeshewasreallygoingotherway.ButbeforeItookupthecouragetolooksheranrightpastmegrabbedmyarmandfiercelypulledmealong. Thiswastoomuch.Istoppedrunningandwasabouttotellhertogetlostwhentheweirdest诡异的thinghappened.Iwasmakingthisbigcirclemovetobreakawayfromherbutsomehowmyhandendeduptangling缠结intohers.Icouldn'tbelieveit.ThereIwasholdingthedirtymonkey'shand! ItriedtoshakeheroffbutshejustheldontightandpulledmealongsayingComeon! 1.WhendidBryceandJulieBakerfirstmeet? A.Inthesummervacationaftersecondgrade. B.Inthesummerbeforethemovingvancame. C.WhenBryce'sfamilymovedtoJulie'sneighborhood. D.WhenJulie'sfamilywasreadytomoveoutoftheneighborhood. 2.WhatdidBryceandhisdadthinkofJulieBaker? A.JulieBakerwasadirtytrouble﹣maker. B.JulieBakerwasalovelyandactivegirl. C.JulieBakerwasaveryfriendlyneighbor. D.JulieBakerwasawarm﹣heartedandhelpfulgirl. 3.WhydidBryce'sdadwinkathimashetalked? A.HewantedtoplayajokeonBryce. B.HetriedtopersuadeBrycetohelphismother. C.HeplannedwithBrycetofoolJulietoleavethem. D.HemeanttocheatBryceandJulietogobackhome. 4.Whatwouldprobablyhappennext? A.BryceandJuliewouldhaveafight. B.Juliewouldgobacktoherownhome. C.BryceandJuliewouldplaytogetherlikefriends. D.JuliewouldfollowBrycetohishometohelphismother.
VWXYZ是原子序数依次递减的五种常见元素．X元素是地壳中含量最多的元素YZ组成的气态化合物M的水溶液呈碱性W的单质在X2中燃烧产物可使品红溶液褪色V是一种历史悠久应用最广泛的金属元素．请回答 1Y元素在周期表中的位置是写出XZ两种元素组成的化合物Z2X2的一种用途． 2由以上五种元素两两组合所形成的化合物中有一种物质能与水反应生成气体且反应属于氧化还原反应请写出该反应的化学方程式． 3XYZ三种元素可组成一种强酸UM在适当条件下被U吸收生成一种盐．该盐的水溶液的pH7填“大于”“小于”或“等于”．原因是用离子方程式表示 4若将V金属投入到盐酸溶液中生成了浅绿色溶液N．N的酸性溶液与双氧水反应的离子方程式． 5有人设想寻求合适的催化剂和电极材料以Y2Z2为电极反应物以HCl﹣NH4Cl溶液为电解质溶液制造新型燃料电池试写出该电池的正极电极反应式．放电时溶液中H+向填“正”或“负”极．
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