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如图2，已知等腰三角形ADC，AD＝AC，B是线段DC上的一点，连结AB，且有AB＝DB． （1）若∠BAC＝90°，AC＝，求CD的长； （2）若＝，求证：∠BAC＝90°．
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已知如图在△ABC中D.为AB边上一点∠A.=36ºAC=BCAC²＝AB・AD.1试说明△ADC和
已知顶角为36°90°108°°四个等腰三角形都可以用一条直线把这四个等腰三角形每个都分割成两个小的
）1个 （
）2个 （
）3个 （
）4个
1如图①若AD平分∠BACCE∥DA则△是等腰三角形2如图②若AD平分∠BACDE∥BA则△是等腰三
线段AB和直线l在同一平面上.则下列判断可能成立的有个直线l上恰好只有个1点P.使△ABP为等腰三角
已知满足则的形状是
等腰三角形
直角三角形
等边三角形
等腰三角形或直角三角形
从三角形不是等腰三角形一个顶点引出一条射线与对边相交顶点与交点之间的线段把这个三角形分割成两个小三角
如图△ABC中AB=AC∠A.=36°称满足此条件的三角形为黄金等腰三角形.请完成以下操作画图不要求
线段AB和直线l在同一平面上.则下列6个判断中可能成立的有______个1直线l上恰好只有个1点P.
等腰三角形一腰上的中线把这个三角形的周长分成1︰2两部分已知这个等腰三角形周长为36cm则这个等腰三
4
10
20
4或20
探究一如图正△ABC中E.为AB边上任一点△CDE为正三角形连接AD猜想AD与BC的位置关系并说明理
已知如图在△ABC中D.为AB边上一点∠A.=36ºAC=BCAC＝AB・AD.1试说明△ADC和△
如图△ABC中AB=AC∠A=36°称满足此条件的三角形为黄金等腰三角形.请完成以下操作画图不要求使
从三角形一个顶点引出一条射线于对边相交顶点与交点之间的线段把这个三角形分割成两个小三角形如果分得的两
课本的作业题中有这样一道题把一张顶角为36°的等腰三角形纸片剪两刀分成3张小纸片使每张小纸片都是等腰
下列说法中错误的有个.①等腰三角形的底角是锐角②等腰三角形的角平分线中线和高是同一条线段③等腰三角形
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已知abc是△ABC的三边长且满足a3+ab2+bc2=b3+a2b+ac2则△ABC的形状是
等腰三角形
直角三角形
等腰三角形或直角三角形
等腰直角三角形
下面关于等腰三角形的定义说法最为恰当
两腰相等的三角形叫做等腰三角形
有两边相等的三角形是等腰三角形
有两边相等的三角形叫做等腰三角形
在中已知则的形状是
等腰三角形
直角三角形
等腰直角三角形
等腰三角形或直角三角形
已知如图在△ABC中D.为A.月边上一点∠A.=36°AC=BCAC2=AB・AD.1试说明△ADC
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8分BluePlanetⅡ'slatestepisodefocusesonhowplasticishavingadevastatingeffectontheoceanandslowlypoisoningourseacreatures.ResearchersrecentlyalsofoundthatseacreatureslivinginthedeepestplaceonEarththeMarianaTrenchhaveplasticintheirstomachs.Indeedtheoceansaredrowninginplastic. Thoughitseemsnowthattheworldcouldn'tpossiblyfunctionwithoutplasticsplasticsarearemarkablyrecentinvention.Thefirstplasticbagswereintroducedinthe1950sthesamedecadethatplasticpackagingbegangaininginpopularityintheUnitedStates.Thisgrowthhashappenedsofastthatscienceisstillcatchingupwiththechange.Plasticspollutionresearchforinstanceisstillaveryearlyscience. Weputalltheseplasticsintotheenvironmentandwestilldon'treallyknowwhattheoutcomesaregoingtobe.Whatwedoknowthoughisdisturbing.Oceanplasticisestimatedtokillmillionsofmarineanimalseveryyear.Nearly700speciesincludingendangeredonesareknowntohavebeenaffectedbyit.Oneinthreeleatherbackturtleswhichoftenmistakeplasticbagsforjellyfishhavebeenfoundwithplasticintheirbellies.Ninetypercentofseabirdsarenoweatingplasticsonaregularbasis.By2050thatfigureisexpectedtoriseto100percent. Andit'snotjustwildlifethatisthreatenedbytheplasticsinourseas.Humansareconsumingplasticsthroughtheseafoodweeat.Icouldunderstandwhysomepeopleseeoceanplasticasadisasterworthmentioninginthesamebreathasclimatechange.Butoceanplasticisnotascomplicatedasclimatechange.Therearenooceantrashdeniers否认者atleastsofar.Todosomethingaboutitwedon'thavetoremakeourplanetenergysystem. Thisisnotaproblemwherewedon'tknowwhatthesolutionis.Weknowhowtopickupgarbage.Anyonecandoit.Weknowhowtodispose处理ofit.Weknowhowtorecycle.Wecanallstartbythinkingtwicebeforeweusesingle﹣useplasticproducts.Thingsthatmayseemordinarylikeusingareusablebottleorareusablebag﹣﹣whentakencollectivelythesechoicesreallydomakeadifference. 1Whyisplasticspollutionresearchstillaveryearlyscience? A.Theplasticspollutionresearchistoodifficult. B.Plasticshaveproducedlesspollutionthancoal. C.Theworldcouldn'tpossiblyfunctionwithoutplastics. D.Plasticshavegainedinpopularitytoofastforsciencetocatchup. 2HowdidtheauthorsupporthisopinioninParagraph3? A.Hepresenteddata. B.Hementionedremarksfromexperts. C.Heusedexamplesfromhisownexperience. D.Heusedthestrategyofcomparisonandcontrast. 3Whatcanweinferaboutclimatechange? A.Climatechangeiscausedbyhumanactivities. B.Somepeoplecastsomedoubtsonclimatechange. C.Climatechangeislessimportantthanoceanpollution. D.Oceanplasticismorecomplicatedthanclimatechange. 4Whatisthemainideaofthispassage? A.Oceanplasticisaglobalissue. B.Theoceansbecomechokedwithplastic. C.BluePlanetⅡhasleftviewersheartbroken. D.Plasticsgaininpopularityallovertheworld.
8分Thinkaboutthedifferentwaysthatpeopleusethewind.Youcanuseittoflyakiteortosailaboat.Windisoneofourcleanestandrichestpowersources来源aswellasoneoftheoldest.Evidenceshowsthatwindmills风车begantobeusedinancientIranbackintheseventhcenturyBC.TheywerefirstintroducedtoEuropeduringthe1100swhenarmiesreturnedfromtheMiddleEastwithknowledgeofusingwindpower. Formanycenturiespeopleusedwindmillstogrind磨碎wheatintoflourorpumpwaterfromdeepunderground.Whenelectricitywasdiscoveredinthelate1800speoplelivinginremoteareasbegantousethemtoproduceelectricity.Thisallowedthemtohaveelectriclightsandradio.Howeverbythe1940swhenelectricitywasavailabletopeopleinalmostallareasoftheUnitedStateswindmillswererarelyused. Duringthe1970speoplestartedbecomingconcernedaboutthepollutionthatiscreatedwhencoalandgasareburnedtoproduceelectricity.Peoplealsorealizedthatthesupplyofcoalandgaswouldnotlastforever.Thenwindwasrediscoveredthoughitmeanshighercosts.Todaythereisaglobalmovementtosupplymoreandmoreofourelectricitythroughtheuseofwind. 1Fromthetextweknowthatwindmills. A.wereinventedbyEuropeanarmies B.haveahistoryofmorethan3000years C.usedtosupplypowertoradioinremoteareas D.haverarelybeenusedsinceelectricitywasdiscovered 2Whatwasanewuseforwindpowerinthelatel9thcentury? A.Sailingaboat. B.Producingelectricity. C.Grindingwheatintoflour. D.Pumpingwaterfromunderground. 3Oneofthereasonswindwasrediscoveredinthe1970sisthat. A.windpoweriscleaner B.itisoneoftheoldestpowersources C.itwascheapertocreateenergyfromwind D.thesupplyofcoalandgasfailedtomeetneeds 4Whatwouldtheauthorprobablydiscussintheparagraphthatfollows? A.Theadvantageofwindpower. B.Thedesignofwindpowerplants. C.Theworldwidemovementtosaveenergy. D.Theglobalmovementtowardsproducingpowerfromwind.
10分 HowtoBeGrateful感恩的 Hasyourmotherorbestfriendtoldyouthatyou'reanungratefulperson?1Doyoukeepthinkingaboutthethingsyoudon'thaveinsteadofbeingthankfulforwhatyoudohave?Ifsothenyouneedtoworkonbeingamoregratefulperson. ●2Thisisn'tareligiouszōng jiāo 的thing.Youdon'thavetoholdoffonnotingeverythingyou'rethankfulforuntilThanksgiving.EverySundaygetanotebookandsitoutsideforfifteenminuteswhilemakingalistofallofthethingsyou'rethankfulfor. ●Begratefulforyourfriendships.3Youmaycometothinkthatyourfriendsarekindandthey'rejusttherelikethecouchinyourlivingroom.Ifyoutakeyourfriendsforgrantedfortoolongthentheywillslowlymaketheirwayoutofyourlife. ●Begratefultoyourfamily.Yourfamilyisanotherthingyoushouldbegratefulto.Yourparentsmighthaveevenbeenthepeoplewhotellyouthatyoushouldbemoregrateful.4.Don'tletadaygobywithouttellingyourfamilyhowmuchyoulovethem. ●5Throughouthistoryimaginehowmanypeoplehavecontributedtowhereyouarenow.Realizingthatyoucouldn'tbewhatyouarenowifitweren'tforallofthesepeopleisanimportantstepinbeingagratefulperson. A.Makeagratitude感激listeverySunday. B.Friendshipsandhealthareveryimportantinourlife. C.Begratefulforallofthegooddeedsdoneforyourbenefit. D.Manypeopleareguiltyoftakingtheirfriendsforgranted. E.Youshouldkeepeverythingthatyouaregratefulforinmindeveryday. F.Sotakethetimetotellyourfamilyhowmuchtheymeantoyou. G.Doyoufeelunabletoappreciatethebeautynatureandlovethatareallaroundyou?
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下列曲线能正确表达对应的反应或过程的是
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30分IdovoluntaryworkforanorganizationthathelpsthepeopleinneedinHaiti.RecentlyItookmysonBarrettthereforaweekhopingto1him. BeforesettingoutItoldBarrettthistripwouldbetiringand2.Forthefirsttwodayshesaidalmostnothing.Iworriedthetripwastoo3fora17﹣year﹣old.Thenondaythreeaswewere4overhighrockymountainsheturnedtomeandgrinned咧嘴笑Prettyhard. Afterthattherewasnoturningback.Afive﹣year﹣oldgirlwearingadressseveralsizes5largeandbrokenshoesfollowedBarrettaroundmesmerized着迷.Hecouldn'tstop6.Laterhesaid7.IwishIcouldspeakFrench.Iwas8﹣thisfromaboywhohatedand9Frenchclassesthroughoutschool. Usuallysilenthe10Gabyourhostandkeptaskingquestionsaboutthecountryanditspeople.Heblossomed活泼起来. 11themomentthatreallytook12breathawayoccurredinavillagedeepinthemountains.Iwas13awomanvillagerforanarticle.135centimeterstallshewassmallinfigurebutstrongin14.Throughdeterminationshehadlearnedtoreadandwriteand15tobecomepartoftheleadershipofthe16. LearningherstoryBarrettwasas17asIbythistinywoman'sachievements.Hiseyeswerewetandtherewasa18ofloveandrespectonhisface.Hehadfinallyunderstoodtheimportanceofmywork. WhenleavingforhomeBarrettevenofferedtostay19asavolunteer.Myinsidessuddenlyfeltstruck.This20achievedallI'dexpected.Soonhewillcelebratehis18thbirthday.He'llbeaman. 1A.educate B.attract C.please D.comfort 2A.troublesome B.dangerous C.rough D.violent 3A.little B.slow C.fast D.much 4A.running B.moving C.looking D.climbing 5A.so B.very C.even D.too 6A.crying B.joking C.shouting D.smiling 7A.patiently B.regretfully C.cheerfully D.lightly 8A.disappointed B.ashamed C.determined D.surprised 9A.calledoff B.foughtagainst C.wentinfor D.tookup 10A.recognized B.disregarded C.avoided D.befriended 11A.Even B.Thus C.However D.Meanwhile 12A.our B.his C.my D.her 13A.interviewing B.asking C.describing D.arranging 14A.wish B.brain C.health D.will 15A.struggled B.appeared C.failed D.hesitated 16A.city B.village C.organization D.state 17A.bored B.pleased C.touched D.puzzled 18A.combination B.connection C.composition D.satisfaction 19A.behind B.in C.out D.away 20A.article B.trip C.interview D.flight
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8分Happybirthday！Dobirthdaysreallymakepeoplehappy?Ofcoursetheydo.Wecelebratethedaywewereborn.Besidesthatextracandleonthecakesuggestsanotheryearofgrowthandmaturity﹣orsowehope.Weallliketoimaginethatwe'regettingwiserandnotjustolder.Mostofusenjoyseeingthemiracleofgrowthinothersaswell.Forinstanceseeingourchildrendevelopandlearnnewthingsmakesusfeelproud.ForAmericanslikepeopleinmostculturesgrowingupisawonderfulprocess.Butgrowingold?That'sadifferentstory. Growingoldisnotexactlypleasantforpeopleinyouth﹣oriented以年轻人为中心的Americanculture.MostAmericansliketolookyoungactyoungandfeelyoung.AstheoldsayinggoesYou'reasyoungasyoufeel.Olderpeoplejokeabouthowmanyyearsyoungtheyareratherthanhowmanyyearsold.Peopleinsomecountriesvaluetheagedasasourceofexperienceandwisdom.ButAmericansseemtofavorthosethatareyoungoratleastyoungatheart. ManyolderAmericansfindthegoldenyearstobeanythingbutgolden.Economicallyseniorcitizensoftenstrugglejusttogetby.Retirementatage65bringsasharpdecreaseinpersonalincome.Socialsecuritybenefitsusuallycannotmakeupthedifference.Olderpeoplemaysufferfrompoornutritionmedicalcareandhousing.Someevenexperienceagediscrimination歧视. UnfortunatelytheelderlypopulationinAmericaisincreasingfast.Why?Peoplearelivinglonger.Fewerbabiesarebeingbornandmiddleagedbabyboomersarerapidlyenteringthegroupsoftheelderly.Americamaysoonbeaplacewherewrinkles皱纹arein.Marketingexpertsarealreadynoticingthisgrowinggroupofconsumers. 1Peoplefeelhappywhentheycelebratetheirbirthdaysbecause. A.theycaneatcakes B.theycanbecomemorematureandwiser C.theycanreceivemanypresents D.theywillfeelyoungeratheart 2WhygrowingoldisnotexactlypleasantforpeopleinAmerica?Because. A.youngpeoplelackexperienceandwisdom B.Americanolderpeopleoftenjokeabouttheiroldage C.Americancultureisveryyoung D.differentcountrieshavedifferentopinionsontheoldage 3TheunderlinedsentenceinParagraph3means. A.thegoldenyearscanmaketheoldearnlotsofmoneyandreceivegoodmedicalcare B.theoldpeopleinAmericaleadahardlifewithoutgoodnutritionmedicalcareorhousingaftertheyretire C.theoldinAmericahavetoretireattheageof65 D.theoldcangetwhatevertheylikeexceptgold 4Theunderlinedpartinthelastsentenceofthispassagerefersto. A.theold B.theyoung C.middleagedpeople D.children
8分Thesehotelsdon'thaveallthenecessaryfacilitiesbuteachofthemofferssomethingdifferent.Don'tmissthemifyoutraveltoCanada. SleeponatrainattheTrainStationInn.ThishotelisinanoldtrainstationinNovaScotia.TheownersJamesandShelleyLeFresneusethestationandthetrainasrooms.TherearesevenoldcarsandthereisalsoarestaurantinthediningcarPricesarefrom＄89to＄169perroomortraincar. SleepinajailintheCanadiancapitalOttawa.HereyoucansleepintheolddowntownOttawaJailHostel.Therearegrouporprivatebedrooms.Therearestillbarsonthedoors!Pricesarefrom＄25to＄65.Don'tworrytherearen'tanycriminalsthere! SleepinatepeeatentoftheAmericanIndiansataUNESCOWorldHeritagesiteinAlberta.Atthishotelthereareguidedtoursandlessonsinlocalculture.Thebestpartsleepinginarealtepeeoutside.Thepriceisaround＄300or＄620forafullpackage. SleepinalighthouseattheQuirponLighthouseInn.ThishotelisonNewfoundland'sQuirponIsland.Therearegreatviewsoftheoceanfromthewindows.Thereare11privateroomsintotal.Pricesarefrom＄225forasingleto＄350forasuite.Mealsareincludedintherestaurant.ThehotelhasthetraditionallookandfeelofthelighthousesothereisnoInternetTVortelephonesintherooms.Therearetoursavailableandboattourstotheislandareincluded. 1WhatcanyoudoifyouchoosetheTrainStationInn? A.Shopintheoldtraincars. B.Learnhowtodrivethetrain. C.Havemealsinthediningcar. D.EnjoyarailtourofNovaScotia. 2InwhatwayisstayinginatepeeinAlbertaspecial? A.Itserveslocalfoodtodiners. B.Youcansleepintheopenair. C.YoucantourAlbertaforfree. D.Itofferslessonsonmakingtepees. 3WhichisunavailableattheQuirponLighthouseInn? A.Privaterooms. B.Guidedtours. C.Dailymeals. D.TheInternet. 4You'llpaytheleastifyouchoosetosleep A.intheOttawaJailHostel B.attheTrainStationInn C.inatepeeinAlberta D.attheQuirponLighthouseInn
8分Scientistshavebeenstudyinghowpeopleusemoneyforlong.Nowthey'refindingsometheoriesmayapplytoonegroupofmonkeys. Researchersrecentlytaughtsixmonkeyshostousemoney.Theygavethemonkeyssmallmetaldisks圆片thatcouldbeusedlikecashandshowedthemsomeyummyapplepieces.Themonkeyssoonfiguredoutthatiftyeygaveoneofthediskstoascientistthey'dreceiveapieceofappleinreturn. Ifyouthinkthatisallthemonkeyscanfigureoutyouarewrong.TworesearchersJakeandAllisonactedasapplesellersintheexperiments.Themonkeysweretestedoneatatimeandhad＝12diskstospendineachexperiment.JakealwaysshowedthemonkeysonapplepiecewhileAllisonalwaysshowedtwopieces.Butthat'snotnecessarilywhattheygavethemonkeys.Thenumberofapplepiecesgivenforadiskwasdeterminedatrandom. ExperimentOneAllisonshowedtwopiecesofapplesbutgavebothpieceonlyhalfthetime.Theotherhalfshetookonepieceawayandgavethemonkeyjusttheremainingpiece.Jakeontheotherhandalwaysgaveexactlywhatheshowedonepieceforeachdisk.ThemonkeyschosetotrademorewithAllison. ExperimentTwoAllisoncontinuedtosometimesgavetwopiecesandsometimesonepiece.ButnowhalfthetimeJakegavetheoneapplepiecehewasshowingandhalfthetimeheaddedabonus.Guesswhat?ThemonkeyschosetotrademorewithJake. InthefirstexperimentthemonkeyscorrectlyfiguredoutthatiftheytradedwithAllisonthey'dendupwithmoretreats.InthesecondonewhenamonkeyreceivedtwopiecesfromJakeitseemedlikeagain.WhenAllisongavethemonkeyonlyonepieceinsteadofthetwosheshoweditseemedlikealoss.ThemonkeyspreferredtradingwithJakebecausethey'drathertakeachanceofseemingtowinthanseemingtolose. Wealsosometimesmakesillybusinessdecisionsjusttoavoidthefeelingthatwe'regettinglessevenwhenwe'renot.Wouldyouhavemadethesamechoices? 1Whatconclusionmightexpertsdrawfromthefirstexperiment? A.Peoplearesmarterintermsoffinance. B.It'seasytoteachmonkeyshowtotrade. C.Businesstheoriescanapplytoallmonkeys. D.Themonkeysshowcertainbusinesssense. 2Whatdoesabonusinparagraph5referto? A.Acoin. B.Achance. C.Ametaldisk. D.Anapplepiece. 3WhydidthemonkeyschoosetotrademorewithJakeinthesecondexperiment? A.Becausetheydidn'tlikethefeelingoflosing. B.BecausetheygetmoreapplepiecesfromJake. C.BecauseJakealwaysgavethemtwoapplepieces. D.BecausetheapplepiecesfromJakewereyummy. 4Whatcouldbethebesttitleforthepassage? A.DiskforAppleWhotoTradewith? B.ShoppingforBargainSameofdifferent? C.Moneky'sBusinessSenseSmartorSilly? D.People'sBusinessDecisionLoseorGain?
15分BornonJune121929AnneFrankwasaGerman﹣Jewishteenager1wasforcedtogointohidingduringtheHolocaust大屠杀.Sheandherfamilyalongwithfourothers2spendovertwoyearsduringWorldWarⅡ3hideinanotherpartofroomsaboveherfather'sofficeinAmsterdam. Sinceitwasfirstpublishedin1947AnneFrank'sdiaryhasbecomeoneofthe4powerfulmemoirs回忆录oftheHolocaust.5itmessageofcourageandhopeinthefaceofdifficultyhasreachedmillions.Thediaryhasbeentranslatedintomorethan60languageswithover30millioncopies6sell.AnneFrank'sstoryisespecially7meaningtoyoungpeopletoday.Formanysheistheirfirstexposure接触tothehistoryoftheHolocaust. AfterbeingreportedtotheNazisAnneherfamilyand8otherslivingwiththemwerearrested逮捕andsenttoNaziconcentrationcamps.InMarchof1945several9monthaftershewasarrestedAnneFrankdied.Shewasfifteenyearsold. Hercourageandlegacyliveonandsheisfrequentlyregarded10arolemodelfortod
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. ManystudentsgotoInternetbarsplayvideogamesthattakesmuchoftheirprecioustime.SomestudentsevenstayedinInternetbarsdayandnightforgottheirstudies.Nodoubtthesestudentswillfinallyendupwiththeirbrightfuturedestroy.Furthermoresomestudentsvisitunhealthilywebsitesbyaccidents.Andtheyarefinallyabsorbedtotheexcitementofreadingunhealthystoriesorwatchingdirtyvideos.AlltheseareharmfultotheteenagersandifonlythisisnotcontrolledortheuseoftheInternetisnotproperlyguidedsomeofuswillgothewrongway.
几种物质的溶解度曲线如图．则下列说法正确的是
6分STOCKHOLMMarch11Xinhua﹣﹣AlthoughstillcoldintheNordicinearlyspringSwedishkidscouldn'twaittogoforoutdooractivitiesintheearlyspring. OnSaturdayoutdoorclubsandexhibitorsbroughttheirnewproductstotheSwedishOutdoorShow2017inStockholmandencouragedkidstoplayandjointheiractivities. ThisisgoldpanningthatwedointhemiddlepartofSwedenasmalltowncalledKopparberg.ItisaniceactivityforchildrenforadultsjusttobeoutinthenatureandseethelovelynaturethatwehaveinSwedenandmaybefindsomegoldexhibitorUllaKalander﹣KarlssontoldXinhua.TheyhaveseentheprogramontelevisioncalledGoldRushthatcomesfromCanada.Somanypeopleareinterestedingoldpanningtheywanttoberich.Butyoudonotberichyoujustberichofseeingthenaturesheadded. ApartfromtraditionalactivitieslikekayakingandclimbingdivingisanotherfavoriteoutdoorsportsfortheSwedes. Stockholmissurroundedbylakesandeveryoneisreallygoingintolakesanddivingswimmingetc.KidsaretaughttoswimalreadyinschoolsoeverySwedishkidcanswimandgoingfromthereintodivingiseasyofcourseexhibitorAndersHolmbergtoldXinhua. Thethree﹣daySwedishOutdoorShowlastsuntilSundayandisexpectedtobringabout30000activeoutdoorpeoplewithdifferentinterestsandlevelsofexperience. 1HoldingSwedishOutdoorShowisto. A.makesomepeoplebecomerich B.makeaprofitfortheorganization. C.getmorepeopletogetclosetonature D.makepeoplemuchstrongerinhealth 2Theunderlinedpartinthefirstparagraphprobablymeans. A.werenotwillingtogo B.hadastrongdesiretogo C.couldhavenoalternativebuttogo D.coulddecidewhethertogoornot 3TheAuthor'spurposeofwritingthepassageisto. Ainform B.entertain C.persuade D.describe
下列图示实验能达到目的是
25分假如你是李华你的英国笔友Peter即将完成学业不久前来信就是否到中国工作询问你的意见.请根据以下提示回一封电子邮件 1建议他来中国 2阐述你的理由就业机会多所学专业受欢迎不同的文化体验等 3承诺可提供帮助. 参考词汇专业major 注意 1词数100～120 2文章开头和结尾已给出不计入总词数 3可适当增加细节以使行文连贯. DearPete I'mverygladtohavereceivedtheletteryousentmelastweek. Bestwishes. Yours LiHua.
某饼干包装上的说明部分如图所示下列说法正确的是
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. Onasnowywinternightabuswith45passengerhadanaccidentbecauseofthewetroad.Andallofthemweretrappinginthebusandwhatwasworsethebusranoutgasanditwasverycoldinit.Theycoulddonothingbuttowait.Amanlivednearbysawwhathadhappened.Heandsomevillagersmanagedtoopenthedoorandhelpedallofthemoutofabus.Thenhetookustohishomebutofferedfoodandwaterandevensomewarmclothestothechildren.Theyspenttwodaysinhishomeandhelpcamefinal.Allofthemarethankfultohimforwhathedid.
8分TodayismyfirstdayatMerchistonCastleSchoolandIwasreallynervousaboutitbecauseIhavenevervisitedtheschoolbeforeanddidn'ttakeanysummercourse.DespitemyanxietyIsoonrelaxedonceIarrivedthestaffweresonicethatIfeltmyspokenEnglishwasbetterthanitactuallywas!AssoonasIwalkedintothedayroomofmyboardinghouseIwasabsolutely完全地amazedbythefriendlyatmosphereeveryonewassofriendlythataboyasshyasIhadnodifficultyinsettinginandImademanynewfriendsonmyveryfirstdayalthoughIwasstrugglingtorememberallthenames. AlsoIrealizedtherewereotherinternationalstudentsinthehousefromallovertheworldsuchasSouthKoreaJapanandRussia.AlthoughtheirEnglishwasnotsofluentitdidn'ttakelongforustounderstandeachotheratall.InsomewaysitwasevenbettertopracticeEnglishbyspeakingtotheinternationalstudentsbecausewewerebothlearning. AsaboarderthequalityoffoodissomethingIconsiderveryimportantandMerchistonhasnotletmedown.Theschoolkitchensarerunbyaprofessionalcateringcompanyandthequalityoffoodisexcellent.Alsotheytaketheissueofahealthydietreallyseriously.IrememberonceIwasaskedtotakemoresaladformymealbyamemberofthekitchenstaffforIdidnothaveenoughvegetables.Thisbringstoanotherpointofbeingaboarderyouneedtolearnhowtolookafteryourselfandberesponsibleforyourself.Oneofthehugeadvantagesofbeingaboarderisthatwecanhavebreakfastintheschoolwhichmeanswedon'thavetopullourselvesoutofthebedasearlyasthedaypupils! 1WhywasthewriternervouswhenhewasatMerchistonCastleSchoolonthefirstday? A.Becausehehadnofriendsandrelativesthere. B.Becausehedidn'tknowtheschoolwell. C.BecausehewasnotgoodatEnglish. D.Becausehewasshy. 2Onthefirstday. A.thoughthewriterwasanxioushesoonrelaxed B.hefoundthedayroomofhisboardinghouseterrible C.hemademanynewfriendsbuthedidn'trememberanyoftheirnames D.hethoughthespokeEnglishbetterthanthestaffintheschool 3WhichofthefollowingisWRONGaccordingtothepassage? A.IntheboardinghousethereareonlystudentsfromSouthKoreaJapanandRussia. B.Theinternationalstudentsintheboardinghousedon'tspeakEnglishveryfluently. C.ThefoodinMerchistondoesn'tmakethewriterdisappointed. D.Theprofessionalcateringcompanythinkstheissueofahealthydietveryimportant. 4Theunderlinedwordboarderinthelastparagraphmeans. A.astudentwhoisfromabroad B.astudentwholivesatschool C.astudentwhoisgoodatEnglish D.astudentwhousedtobeshy
10分1Therewerefewpeopleontheearthandnaturalresourcesseemedtobeunlimited.Todaythingsaredifferent.Theworldhasbecometoocrowded.Weareusingupourresourcestooquicklyandatthesametimewearepollutingourenvironmentwithdangerouschemicals2. Everyonerealizestodayiftoomanyfisharetakenfromtheseatherewillsoonbenoneleft.Yetwithmodernfishingmethodsmoreandmorefisharecaught.Weknowthatiftoomanytreesarecutdownforestswilldisappearandnothingwillgrowintheland.Yetwecontinuetousebiggerandmorepowerfulmachinestocutdownmoreandmoretrees.3Howeverinmostcountrieswasteproductsarestillputintoriversorintotheseaandtherearefewlawstostopthis.Weknowtoothatifthepopulationoftheworldcontinuestoriseinafewyearstherewillnotbeenoughfood. 4Ifweeatmorevegetablesandlessmeattherewillbemorefoodavailableforeveryone.Landthatisusedtogrowcropsfeedsfivetimesmorepeoplethanlandwhereanimalsarekept.5theworldpopulationwillnotrisesoquicklyifpeopleusemodernmethodsofbirthcontrol.Finallyifweeducatepeopletothinkaboutthproblemsweshallhaveabetterandcleanerplanetinthefuture. A.Whatcanwedotosolvetheseproblems? B.Soweshouldtryourbesttoprotecttheenvironment. C.Inthepastmandidn'thavetothinkabouttheprotectionofhisenvironment. D.Werealizethatiftheriversarepollutedwithwasteproductsfromfactorieswewilldie. E.Whydosomepeopledosofoolishthings? F.Ifwecontinuetodothishumanlifewon'tsurviveinthefuture. G.Outnaturalresourceswilllastlongerifwelearntorecyclethem.
危险化学品要在包装标签上印警示性标志．氢氧化钠应选用的标志是
8分IdecidedtoskitotheNorthPole.ItwasafterIsawanadvertisementinanewspaperlookingforpeopletojoinateamtoski350milestotheNorthPole.Backin1996therehadneverbeenawomanfromtheU.K.whohadaccomplishedthischallenge.IwonderedwhatitwouldbeliketosurviveintemperaturescoldenoughtofreezeyourfleshinsecondssoIsentofffortheapplicationform. Theapplicationformfullofpicturesofmaleexplorersarrived.ThewordsAreyoumanenoughfortheultimate极端的challenge?mademeangryandevenmoredeterminedtogetontheteam. Over500individualsappliedforaplaceintheteamandtheselectionprocessincludedphysicalandpsychologicaltestsdesignedtopickthebestgroup.InonetesttherewasahugeropeladderwehadtoclimbandIfrozeatthetopbecauseIhaveafearofheights.Ithoughtmyhopeswerefadingasmostotherapplicantssailedpastleavingmebehind.ButtwoothershelpedmeoverandlaterIfoundoutthattheorganizerswerenotlookingforamazingindividualsbutgreatteamplayersandthismomenthadshownthemwhowouldtakecareofothersintheteam. Ihadrevealed展示myweaknessandinaplaceliketheArcticyouhavetobeyourselfasthereisnowheretohide.Thesepersonalitiesofaskingforhelpandshowingweaknessarenecessaryforwomentomaster. IrealizedthatbybeingmyselfIcouldsucceed.Iwasselectedfortheteam.IrealizedthatIcouldachievemorethanIeverimagined﹣﹣﹣moreimportantlybysharingmystorywithothersIcouldinspirethemtotakeastepintothenewworldandrevealmoreoftheirabilities. 1Howdidtheauthorreactonseeingtheadvertisement? A.Shegotcross. B.Shewasdetermined. C.Shegotfrightened. D.Shewashesitating. 2Whatdidtheorganizersviewasthemostimportantintheselection? A.Personalquality. B.Individualability. C.Spiritofteamwork. D.Couragetochallenge. 3Whatdoestheauthorthinkofwomen'sshowingweakness? A.Beneficial. B.Shameful. C.Merciful. D.Disturbing. 4What'stheintentionoftheauthorinwritingthispassage? A.Toinspireustoprepareforourfuturegoal. B.Toadvisewomenhowtoturntoothers. C.Tomakesuggestionstoherteammembers. D.Toencouragepeopletoexploretheunknown.
鉴别下列物质所用的方法错误的是
30分OnewinterwhenIwaseightmyfatherandItookaridetoAuntSally'shouse.Halfwaybackhomethecar1toshakeandslowdown.Dad2thatthecarhadaflattire.Tomake3worsewewerestuckinthemiddleofasnowstorm.Icouldhearthe4inmydad'svoiceashesaidwecouldonlyuseaChristmasmiraclerightnow.IrememberhowmuchI5thatoldredcarmainlybecausetheradiodidn'twork.Actually6reallyworkedinthatcarbut7Dadgothismiracle﹣theheaterbegantooperateandwewerevery8thatwewouldn'tfreezetodeath.We9thereforsomeonetocomealongandhelpusout. Thecoldwindstartedblowingin10thelittlespaceinthedoorandthewindow.Itwhistledandmoanedand11meverymuch.FromthewindIcould12thepinetreeintheairtiedtotheroofofthecar.DadandIbothbegansearchingforsome13toclog堵塞thatthinspaceto14thecoldout.AsI15myjacketpocketIrealizedtherewasapieceoffoldedpaperinit.Ipulleditout16torealizethatitwasthewordsofthecarol颂歌Hallelujah.Ihadasudden17tosingsoIbegantosingit.Dadalso18menowandthen.BythetimeIsangHallelujahafterthesecondversethewindshad19.Aswesang…andeverybreathwedrewwasHallelujahwehearda20honk喇叭声comingfrombehindus.ItwasmyuncleMitchcomingourwaywithhelp. 1A.continued B.tended C.refused D.began 2A.wished B.realized C.doubted D.imagined 3A.conditions B.images C.things D.roads 4A.helplessness B.excitement C.sadness D.disappointment 5A.wanted B.hated C.repaired D.missed 6A.something B.anything C.nothing D.everything 7A.luckily B.expectedly C.generally D.regularly 8A.afraid B.thankful C.sure D..hopeful 9A.called B.asked C.waited D.looked 10A.through B.by C.across D.between 11A.encouraged B.loved C.surprised D.scared 12A.see B.admire C.smell D.grow 13A.way B.time C.person D.energy 14A.give B.take C.let D.keep 15A.fellinto B.reachedinto C.lookedinto D.putinto 16A.just B.even C.only D.still 17A.desire B.chance C.change D.act 18A.supported B.praised C.joined D.comforted 19A.grew B.calmed C.started D.stopped 20A.strange B.familiar C.frightening D.boring
15分TheTowerBridgeisoneofthetwenty﹣sevenbridgesovertheRiverThames.ItisclosetotheTowerofLondonfrom1theTowerBridgegotitsname.ItisasymbolofLondon. ItisrecordedthattheTowerBridge2buildin1894andnowitisoneofthe3famousbridgesintheworld.It'sinterestingthatitsmiddlepartcanberaised4letbigshipspass.Itusedtoberaisedabout50timesadaybutnowitisraisedonly4to5timesaweek.Ifyouareluckyenoughtoseethebridgewithitstwoarmsopenhighintheairyou'llneverforgetit. PeopleoftenthinktheTowerofLondonandtheTowerBridgeare5thesameage.6infacttheTowerofLondonwasbuilt1000yearsagowhilethelatteronly7haveahistoryofover100years. TheTowerBridgewasfirstpaintedchocolatebrown.Lateritwaspaintedredwhiteandblue.ItspicturealsoappearedintheopeningoftheSummerOlympicGames8holdinLondonin2012.Socometovisitthefamousbridge.You'll9surehaveawonderfulexperienceandit'llleaveyoualasting10impress.
某兴趣小组用10g镁条与一定溶质质量分数的稀硫酸反应．测得产生氢气的质量与稀硫酸的质量关系如图所示假设镁条中除表面含有氧化镁外．没有其他杂质 1当所用稀硫酸的质量为70g产生的氢气的质量为 2用化学方程式说明当稀硫酸的质量为10g时为什么不产生氢气 3计算稀硫酸中溶质的质量分数
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