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在△ABC中,AC=5,AB=7,BC=4,点D在边AB上,且AD=3,动点P从点A出发,以每秒1个单位长度的速度向终点B运动,以PD为边向上作正方形PDMN,设点P运动的时间为t,正方形PDMN与...
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在△ABC中AB=AC=5BC=6点D.在边AB上DE⊥AB点E.在边BC点F.在边AC上且∠DEF
已知点O.到△ABC的两边ABAC所在直线的距离相等且OB=OC.1如图1若点O.在边BC上求证AB
如图所示在△ABC中AB=AC=5D.是BC上的点DE∥AB交AC于点E.DF∥AC交AB于点F.
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在△ABC中点D.E.分别在边ABAC上CD平分∠ACBDE∥BC.如果AC=10AE=4那么BC=
在△ABC中AB=6BC=5AC=4AD平分∠BAC交BC于点D.在AB上截取AE=AC则△BDE的
如图在△ABC中AB=AC=5D是BC上的点DE∥AB交AC于点E.DF∥AC交AB于点F.那么四边
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如图已知在△ABC中AB=ACM.是边BC的中点D.E.分别是边ABAC上的点且BD=CE求证MD=
在△ABC中点D.E分别在边AB.AC上联结DE那么下列条件中不能判断△ADE和△ABC相似的是
DE∥BC
∠AED=∠B
AE:AD=AB:AC
AE:DE=AC:BC
如图在△ABC和△BDE中点C.在边BD上边AC交边BE于点F.若AC=BDAB=EDBC=BE则∠
∠EDB
∠BED
∠AFB
2∠ABF
如图1点D位于△ABC边AC上已知AB是AD与AC的比例中项.1求证∠ACB=∠ABD2现有点E.F
在△ABC中AB=5AC=4BC=3D是边AB上的一点E是边AC上的一点DE均与端点不重合如果△C
在△ABC中AB=AC点D在边BC所在的直线上过点D作DF∥AC交直线AB于点FDE∥AB交直线AC
如图在△ABC中AB=3AC=4BC=5P.为边BC上一动点PE⊥AB于E.PF⊥AC于F.则EF的
如图△ABC中AB=5AC=6BC=4边AB的垂直平分线交AC于点D.则△BDC的周长是
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在△ABC中AB=6AC=8BC=10P.为边BC上一动点PE⊥AB于E.PF⊥AC于F.M.为EF
在△ABC中AB=AC=5BC=6若点P.在边AB上移动则CP的最小值是.
如图在△ABC中AB=AC=10BC=12AD⊥BC于点D.点E.在边AB上运动过点E.作EF∥BC
在△ABC中AB=AC点D.在边BC所在的直线上过点D.分别作DE∥AC交直线AB于点E.DF∥AB
在△ABC中DE∥BCDE与边AB相交于点D.与边AC相交于点E.如果DE过重心G.点且DE=4那么
)5; (
)6; (
)7; (
)8.
如图在△ABC中AB=AC∠ABC=30°点O.在边BC上⊙O.经过点A.B.且与BC相交于点D.1
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1分Ithinkit'sreallyhardworkformetofinishthejobintwentyminutes. A.a B.an C.the D.不填
下列有关物质的检验鉴别除杂分离所用的试剂或方法正确的是
10分阅读短文从A﹣E五个句子中选择正确选项还原到文中使短文内容完整正确. A.Anditencouragesyoungpeopletobemoreconfident.B.Musictouchesourheartsandshortens缩短thedistanceC.JayChoudoesmostofthesingingpartwhileKobeplaysapartofarapper说唱者.D.AllthemoneyfromthedownloadswillgotoProjectHope.E.That'sasongwrittenbyJayChouwhosefavoritesportisbasketball. 96betweenpeopleofdifferentcountries.ThesuperstarJayChouhascooperatedwiththeAmericanNBAstarKobeBryanttocreateasongnamedTheHeavenandEarthChallenge.97Itexpressestheloveforbasketball.98JayChouhaslearnedmuchfromKobe'ssportsspirit.Inthesong99Peoplecandownloadtheringtone铃声ofthesongfromtheInternet.100whichaimstoimproveeducationalenvironmentinpoorareasinChina. 96. 97. 98. 99. 100.
5分Therearealotofschoolrulesaroundtheworld.ForexampleinAustraliaCanadaJapanandtheUnitedStatesstudentshavetowearuniformsandtheyarenotallowedtowearearrings. SomeschoolsinJapanandothercountrieshaverulesabouthair.Forexamplestudentsarenotallowedtochangethecoloroftheirhair.IntheUnitedStatesboyscannothavetheirhairgrowlong. ForsafetyatsomeUSschoolsstudentsmusthaveapairofindoorshoesatschooleveryday.Thismakessurestudentswon'tfalloveronthewetfloorsandkeepstheschoolsclean. GumchewingisnotallowedinmanyUSschoolbuildingsasitisdifficulttocleanup.Andifstudentschewguminclasstheymaynotpaymuchattentiontotheirstudies. Inmostforeigncountriesschoolstudentsareallowedtoworkpart﹣time.ButdifferentlyJapaneseschoolstudentsarenotallowedtoworkpart﹣timeorchangethecoloroftheirhair. 41.Whichcountriesshouldstudentsnotbeallowedtowearearringsin A.EnglandandJapan. B.AustraliaandJapan. C.CanadaandChina D.TheUSAandFrance. 42.ArestudentsallowedtochangethecoloroftheirhairinJapan A.Yestheyaren't. B.Notheyare. C.Yestheyare. D.Notheyaren't 43.WhymuststudentshaveapairofindoorshoesatschooleverydayatsomeUSschools A.Thismakesstudentsexercisemoreeasily. B.Thismakesstudentswon'tfalloveronthewetfloors. C.Thiskeepstheschoolsclean. D.Thiskeepstheschoolscleanandmakesstudentssafe. 44.Whatmayhappenifstudentschewguminclass A.Itisdifficulttocleanup. B.Studentswillfalloverintheclassroom. C.Studentsmaynotpaymuchattentiontotheirstudies. D.Theteacherswillbeveryangry. 45.Whatshouldn'tthestudentsbeallowedtodoinJapan A.Theyaren'tallowedtochewgum. B.Theyaren'tallowedtowearuniforms. C.Theyarenotallowedtoworkpart﹣timeorchangethecoloroftheirhair. D.Theyarenotallowedtoeatintheclassroom.
下列各组离子在溶液中能大量共存并形成无色透明溶液的是
1分﹣﹣﹣Thanksforaskingmeyourparty. ﹣﹣﹣. A.Nevermind B.Don'tsayso C.Mypleasure D.Yesplease
10分在下面的空白处填入适当的话语话语可以是句子短语或词 ABobwhatareyoudoingB61.Theletterisaboutbadhabits. AWhatdoyoumean BIseesomepeoplethrowlitteraround.Andsomeoftenwastewater.Youknowwaterisveryimportanttous.AYouareright.62 BTotheTVstation.Ihopetheycancallonpeopletoprotectourenvironment AThenwhatshouldwedotoprotectourenvironment BI'dliketogotothePeople'sParkwithmyfriendsthisSaturday.63 AYesI'mfree.64BWe'regoingtocollectrubbishthere. AGoodidea!I'dliketojoinyou.65 BWe'llmeetat8o'clockatthegateofthepark.Seeyouthen!ASeeyou. 61. 62. 63. 64. 65.
15分个人的成长离不开他人的支持.请结合下面的提示词以PeopleWhoHelpMe为题写一篇80词左右的短文.分别谈谈老师家人及朋友曾在哪些方面给予你关心和帮助你将怎样回报他们. 要求1.条理清楚书写工整句式规范标点符号和大小写使用正确. =2.短文中不能出现真实的人名地名.文章开头已给出不计入单词总数. =3.提示词语careforknowledgeencouragesupportdifficultyinthefuturestudyharder提示词不必全部用上.PeopleWhoHelpme DuringtheseyearsIhavegotlotsofhelpfrommyparentsteachersandfriends..
1分Weallourcountrytobestrongerandstronger. A.hope B.wish C.think D.like
2分我喜欢对人友好的人..
2分珍爱自己远离毒品.Becareofourselvesanddrugs.
1分Mr.Kingdidn'tknowyesterdayevening. A.whendoeshissoncomehome B.whendidhissoncomehome C.whenhissoncomeshome D.whenhissoncamehome
1分Themeetingisveryimportant.Webelate. A.needn't B.can't C.maynot D.mustn't
化学为人类社会进步作出了重要的贡献下列对化学的认识中正确的是
为及时发现燃气泄漏常在燃气中加入少量有特殊气味的乙硫醇C2H5SH乙硫醇也可以充分燃烧化学方程式为2C2H5SH+9O2aCO2+2X+6H2OX是氧化物.下列说法不正确的是
1分youhurryupyou'llbelateforschool A.unless B.as C.if D.until
人类的生存与发展离不开化学. 1生活中常把榨好的蔬菜汁放到面粉中做成蔬菜馒头这种馒头提供的主要营养物质是淀粉和. 2铁是应用最广泛的金属.喷漆能防止铁生锈原因是工业炼铁时一氧化碳和磁铁矿 主要成分是四氧化三铁发生的主要反应的化学方程式为. 3生活中硬水软化的常用方法是. 4__是工业上冶炼黄金的重要原料工业上生产__的化学方程式为2Na+2C+2X=2NaCN+ 3H2X的化学式为该气体能使湿润的红色石蕊试纸变. 5配制农药波尔多液的盐是填名称请用化学方程式解释其不能用铁桶盛装的原因 该反应观察到的现象是.
化学是一门以实验为基础的自然学科.下列实验操作中正确的是
6分Mostbeesarebrownhairy多毛的and8to22millimeterslong.Beesarealargefamily.Over25000kindshavebeenfound.73.Amongallofthemhoneybeesarethemostcommon. Honeybeesalwaysliveingroupscalledhives蜂群.Eachhivehasaqueendrones雄蜂andworkers工蜂.Likeahumansocietyeachbeeinahiveknowsitsownjob. 74.Tocollectapoundofhoneyabouthalfakilogrammeabeemayhavetoflyalongway. Sometimesitiseguivalentto相当于twicearoundtheworld.75.Beeshavetovisitmorethan10000flowerstomakeapoundofhoney. 73. 74. 75..
2分我们都坚信钓鱼岛属于中国.WeallbelievethatDiaoyuislandChina.
电视节目荒野求生中的生命吸管如图所示是一种将污水净化为饮用水的吸管装置可以除去99.3%的细菌和病毒但难以除去汞等金属离子.回答下列问题 1汞等金属离子危害人体健康的原因是. 2生命吸管“能”或“不能”使硬水软化.家庭中使硬水软化一般采取方法. 3吸管中活性炭主要用来除去.碘主要起到杀菌消毒作用生活中消毒还可采用84消毒液有效成分是次氯酸钠NaClO杀菌原理是与空气中的二氧化碳和水反应生成碳酸氢钠和次氯酸HClO试写出反应方程式.
1分Theriversmellsterrible.Peopledirtythingsintoit. A.muststoptothrow B.muststopfromthrowing C.mustbestoppedtothrow D.mustbestoppedfromthrowing
5分WhatareyougoingtodoifyouareinaburninghouseHowwillyouescapeDoyouknowhowtosaveyourselfPleasereadthefollowingpassage. Escapingafireisaseriousmatter.Knowingwhattododuringafirecansaveyourself.Itisimportanttoknowthewaysyoucanuseandtoshowthemtoeveryoneinthefamilysuchasstairways楼梯andfireescapesbutnotlifts. Fromthelowerfloorsofthebuildingsescapingthroughwindowsispossiblelearnthebestwayofleavingthroughwindowswiththeleastchanceofseriousinjury伤害. Thesecondfloorwindowisusuallynotveryhighfromtheground.Anaverage普通的personhangingbythefinger﹣tips手指尖willhaveadropofaboutsixfeettotheground.Itisabouttheheightofanaverageman.Ofcourseitissafertojumpashortwaythantostayinaburningbuilding. Windowsarealsousefulwhenyouarewaitingforhelp.Besuretokeepthedoorclosed.Orsmokeandfiremaybedrawn向某方向移动intotheroom.Keepyourheadlowatthewindowtobesureyougetfreshairratherthansmokethatmayhaveleaked泄露intotheroom. Onasecondorthirdfloorthebestwindowsforescapearethosewhichopenontoaroof屋顶.Fromtheroofapersoncandroptothegroundmoresafely.Droppingontocement水泥mightendininjury.Bushesandgrasscanhelptobreakafall. 51.Itisimportantto. A.knowthewaystoescapeafire B.putoutafireinaburninghouse C.jumpoutofaburninghouse D.keepthedoorclosed 52.Itispossibletoescapethroughthewindows.. A.ifyouarestrongenough B.iftherearesomebushesontheground C.ifyouliveonalowerfloor D.ifyouhavealongrope 53.Whichofthefollowingwaysofescapingisnotright. A.Youcanescapethroughstairways B.usealifttocomedownatonce C.Escapethroughthewindowswhichopenontoaroof D.Youcanchoosefineescapes 54.Keepyourheadlowatthewindowsothatifthebuildingisonfire A.youcangetfreshair B.youcancallforhelp C.youcaneasilyjumpoff D.youcanbeseenfirst 55.Thebesttitleforthepassageis. A.Escapingthroughthewindows B.SaveYourselffromABurningHouse C.Knowledgeonfire D.WaitingforHelp.
10分Sometimespeoplecomeintoyourlifeandyouknowthattheyaretheretoteachyoualessonortohelpyouunderstandwhoyouareorwhoyouwanttobecome. Youneverknowthesepeoplewhomaybeaclassmateaneighbourorafriend﹣butwhenyoulockyoureyesonthemyouknowatthatverymomenttheywillinfluenceyourlifeinsomeways. Sometimesthingsthathappentoyoumayseemunpleasantpainfulorfrustratingatfirst.Butinanotherwayyoufindthatwithoutgettingoverthosedifficultiesyouwouldhaveneverrealizedyourabilitystrengthorwillpower意志力. Thepeopleyoumeetandthesuccessyougethelptocreatewhoyouareandwhoyoubecome.Eventhebadexperiencescanbelearnedfrom.Infacttheyaresometimesthemostimportantones. Ifsomeonelovesyougivelovebacktotheminthewayyoucannotonlybecausetheyloveyoubutbecauseinawaytheyareteachingyoutoloveandhowtoopenyourheartandeyestothings. Ifsomeonehurtsyouorbreaksyourheartforgive原谅themfortheyhavehelpedyoulearnabouttrustandtheimportanceofbeingcarefulofpeoplearound. Self﹣confidenceisnecessarytoaperson.Ifyou'renotconfidentitwillbehardforotherstobelieveinyou. Learnalessoninlifeeachdayyoulive! 71.Whocaninfluenceyourlifeinsomeways 72.Areunpleasantthingsgoodforyou 73.Whyarebadexperiencesveryimportanttoyou 74.Whatshouldyoudoifsomebodyhurtsyou 75.Whatdoesthewritertrytotellus.
1分﹣Canyouguessthenewschoolbagyesterday ﹣SorryI'venoidea. A.howmuchdidhepayfor B.howmuchhespent C.howmuchhepaidfor D.howmuchdidhespend
下列做法正确的是
雷雨天气时氮气可逐步转化为硝酸盐.其关键反应为N2+O22NO.该反应属于
1分Whereyou A.havebeento B.havegoneto C.havebeen D.havegone
15分WhenyouwereyoungwhorodeyouaroundonthebackofhisbikeWho21soccerandflewkites22withyouintheparkWhohelpedyouwithyourfirstdifficultmathproblemWhotaughtyouthedifferencesbetween23Yourdad.Nowitisyourturntodosomethingforhim.ThisSundayJune16itisFather'sDay.Sowhynotdo24specialtothankyourdadforallhisencouragementandsupport支持 TheideaofFather'sDaycame25anAmericanladycalledSonoraSmartDoddin1909.Shewantedan26daytohonorherfather.Heraisedsixchildrenbyhimself27hiswifediedduringthebirthoftheirsixthchild.Doddthoughtthereneededtobeadaytohonorhercourageous勇敢的selflessandlovingdad.HerfatherwasbornonJune1928shechosetoholdthefirstFather'sDaycelebrationonhisbirthdayin1910.In1924USPresidentCalvinCoolidgelikedtheideaofanationalFather'sDay.Finallyin1966thethirdSundayinJunewasdeclared宣布Father'sDay. Therearemanywaystoshowyourloveandthanks. Sendhimagreetingcard.Usuallyfathersprefercardsthatarenot29emo﹣ tional使人动感情的.Thereforeperhapschooseonethat30himlaugh. Asmallpresentsuchasaphotoofyourfamily31aspecialwallet32makehimfeellikeaking. Sendhim33andtheredroseisthe34giftintheofficeduringFather'sDay. Ifhehasa35coverhisdesktop桌面withwordslikeIloveyoudad! 21.A.played B.bought C.sold D.gave 22.A.quietly B.sadly C.happily D.loudly 23.A.oldandyoung B.bigandsmall C.rightandwrong D.longandshort 24.A.nothing B.something C.everything D.anything 25.A.in B.out C.over D.from 26.A.easy B.unusual C.strange D.attractive 27.A.when B.until C.after D.before 28.A.so B.because C.until D.if 29.A.much B.also C.many D.too 30.A.willmake B.ismaking C.hasmade D.ismade 31.A.but B.or C.yet D.and 32.A.should B.can C.must D.need 33.A.clothes B.books C.flowers D.computers 34.A.morepopular B.muchpopular C.mostpopular D.popularest 35.A.watch B.computer C.car D.bike.
1分Theoldshouldwell. A.betakecareof B.lookafter C.belookedafter D.betakingcareof
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