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计算6÷-+
在宏观微观与符号之间建立联系是化学学科的特点．按上图所示回答下列问题．1图1中两种微粒属于不同种元素是因为不同．2图2中反应的化学方程式为其基本反应类型是
76.ThemostunusualmuseuminLondonistheScienceMuseumInmostmuseumsthere'snoshoutingandnorunningandpeoplearen'tallowedtotouchtheexhibits陈设品.ButtheScienceMuseumisdifferent.It'snoisy!Peoplecantalkaboutwhattheywillseeanddothereandsomeofthemachinesarenoisyaswell.77.WhenIvisittheScienceMuseumIgototheLaunchpad发射台.Thisisthemostpopularroombecausetherearelotsofphysicstests.Wecanalsolearnhowastronautstravelintospaceandbackagainhere.I'mreallyinterestedinthosekindsofthingssoitismyfavoriteroom.78.OnthesecondfloorthereisHumanandNatureroom.Wecancompareourspeedwithanimalsthere.Ifwearen'tquickenoughthelionwillcatchus!Therearealsoroomsontransporttheenvironmentandspacetechnologyaswellasmathphysicsandchemistry.79.Wecandoalotofthingsinthismuseumbutwehavetoobeysomerulesaswell.Forexamplewemustn'ttakephotosoftheexhibitsinthemuseum.Butwecanbuypostcardsoftheminthemuseumshops.80.MostimportantofalltheScienceMuseumisfree.Thatmeanswecandropbyforafewminutesorwecanstayaslongaswelike—it'sopenfrom10:00a.m.to6:00p.m.everydayexceptMonday.SoifyougotoLondonmakesureyouvisittheScienceMuseum.It'smyfavoritemuseuminthewholeworld.a根据短文内容从方框中选出每段的主旨大意.b根据短文内容完成博物馆游客须知.每空不超过两个词76.77. 78.79.80.81. 82. 83. 84. 85.
Theenvironmentinmyhometownisimprovingbecausemanytreeseveryyear. A.plant B.planted C.areplanted
—Don'ttoturnoffthelightswhenyouleavetheclassroomTom. —AllrightMs.Lee.
Ihaveanpen.HeoftentellsmehowtoimprovemyspokenEnglish.America
Ioftentalkwithmymomaboutmyschoollifethelivingroom.
Iwanttojoinherherbirthdayparty.WhatgiftcanIbuy? A.at B.in C.for D.with
Isheonthesofa?Noheiscookinginthekitchen.drink
已知∠1与∠2为对顶角且∠1的补角的度数为79°32′则∠2的度数为
下列各运算中计算正确的是
Mytwocousinslookquitedifferent.Oneistallbuttheotheris.
某同学在做中和反应实验时用pH传感器测得溶液的pH变化如右图所示回答下列问题．1向A点溶液中滴加紫色石蕊溶液的现象是2曲线上点表示酸和碱恰好完全反应3C点溶液中含有种溶质
—Whattimeisit?— A.Itis8:00a.m. B.Itisfun C.ItisfromChina D.Itisrunning
教育部从2018年开始要求在学校普及垃圾分类回收处理的相关知识．某化学活动小组结合所学的知识对此进行一系列实践活动．Ⅰ．活动探究1学会识图分拣垃圾下列垃圾应投入带有右图图标的垃圾箱内的是填字母序号．A．塑料瓶 B．果皮 C．碎瓷片2学会检验有害气体含氯塑料焚烧时会产生氯化氢等气体．若要检验焚烧后的气体中有氯化氢可将其通入溶液中有白色沉淀生成即可．Ⅱ．实验探究【提出问题】如何回收处理废旧电池中的镉【查阅资料】1废旧电池中含有镉汞等元素这些元素会危害人类健康．2镉Cd从溶液中析出时呈海绵状固体在化合物中通常表现为+2价．3碳酸镉CdCO3氢氧化镉[CdOH2]都是白色固体难溶于水．【设计实验】先将废旧电池进行处理以制得硫酸镉CdSO4溶液用于以下实验．【回收处理】实验结束后将反应后的混合物通过过滤洗涤加热进而再制得镉．【交流反思】请同学们基于化学视角说明垃圾分类回收处理的重要意义答一点即可．
Heeatsalotbecausethefoodis.
Thecoldestseasonoftheyearis.
如图∠3的同位角是
—doyoueatoutMolly? —Onceamonth. A.Howoften B.Howfar C.Howlong
如图点C分线段AB为34AC＜BC点D分线段为AB上一点且11BD=3AD若CD=10cm求AB的长．
WealwaysourclassroomeveryFridayafternoon. A.cleanup B.putup C.useup
—Excuseme.Whereisthenearestbookstore? —GoCenterStreetandyou'llfindit. A.for B.along C.with
MichaelvisitsmanywebsitesaboutChineseculture. A.learn B.learned C.tolearn
化简再求值2x²y-xy²-1-3x²y-3xy²-3其中x=1y=-2．
Maria想举办一个毕业庆祝午餐会向朋友们发出邀请.下面是她的邀请函及收到的部分回复请补全它们. 91. 92. 93. 94.
若3a+b=3则6a-3+2b的值是
PeoplesendbirthdaygreetingsbyusingcardsinbotheasternandwesterncountriesItisnotknownwhenandwhereexactlythetraditionofsendingbirthdaycardsbegan.ItisbelievedthatitbeganinEnglandintheearlynineteenthcentury.Inthosedayspeoplesentbirthdaycardswhentheycouldn'twishsomebodyahappybirthdayinperson.In1840thefirststampwasusedinBritainandsendingbirthdaycardsbecameeasiercheaperandmorepopular.Thedevelopmentofcolorprintingprocesses工艺流程inthe1930salsohelpedtoincreasesalesofbirthdaycards.Todaycardsareoftengivenwithapresentevenwhenpeoplecanexpresstheirwishesfacetoface.Inrecenttimese-cardshavealsobecomepopular.Manypeoplearestartingtousee-cardsinsteadoftraditionalcardsbecausetheyarefreeenvironmentallyfriendlyandeasytoarrive.Sowille-cardstakeplaceofpapercardscompletelyintenortwentyyears?Probablynot.Forexampleforkidsandoldpeopletheydon'tusee-cardsveryoften.Ifyourbirthdayiscomingsoondoyouwishthatatleastonepersoncouldcongratulateyouwithabeautifulcardthen?根据短文内容判断下列各句正T误F.66.Peoplesendbirthdaycardsindifferentcountries. 67.ThetraditionofsendingbirthdaycardsbeganinFranceintheearly18th century.68.Sendingbirthdaycardsbecamemorepopularafterthestampswereused. 69.Wearesurethate-cardswilllakepapercards'placecompletelyintwentyyears.70.Kidsandoldpeopleoftenusee-cards.
阅读上面的信息选择正确答案. 56.ThereissomethingwrongwithGrace'sinText①.A.office B.mobilephone C.printer D.cake57.WemayreadText②ina. A.cookbook B.musicmagazineC.weatherreport D.storybook 58.Text③shouldbea. A.thank-younote B.letter C.postcard D.notice 59.AccordingtoText④LukeSangershouldbeat3:00p.m.onJune29. A.athome B.intheoffice C.ontheplane D.attherestaurant 60.InText⑤therunningclubmembersmeet. A.onceaweek B.twiceaweek C.onceamonth D.twiceamonth
Peopleseldomreadsanowtheyreadnewsonthephone.
AliceandJackaretalkingonthephone. Alice:Hello!Alicespeaking.Who'sthat? Jack:HiAlice.41. Aline:HiJack.Whereareyou? Jack:I'monthebusI'mgoinghomefromwork.42thisweekend? Alice:IamdoingsomeshoppingthisSaturday.Theshoppingcenternearmyhomeishavingasale.What'syourplan? Jack:IjustwanttobuyagiftforMrs.Blackmyscienceteacher.Anyadvice? Alice:Whynot43withmeonSaturday?Youmightgetwhatyouwant. Jack:Goodidea!CouldImeetyouat10:00atyourhome? Alice:Sure.ButbeforethatIcansearchonlineandseeifIcanfind44foryou. Jack:Wonderful!Thankyouverymuch! Alice:45.Keepintouch! 41. 42. 43. 44. 45.
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