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﹣7的相反数是（ ）
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关于相反数的叙述错误的是
两数之和为0，则这两个数为相反数
如果两数所对应的点到原点的距离相等，这两个数互为相反数
符号相反的两个数，一定互为相反数
零的相反数为零
下面说法正确的有①的相反数是－3.14②符号相反的数互为相反数③－－3.8的相反数是3.8④一个数和
０个
１个
２个
３个
-6的相反数的相反数是_______;
下面说法正确的有①π的相反数是﹣3.14②符号相反的数互为相反数③﹣﹣3.8的相反数是3.8④一个数
0个
1个
2个
3个
阅读下面的文字并回答问题1的相反数是﹣1则1+﹣1=00的相反数是0则0+0=02的相反数是﹣2则2
已知ab互为相反数cd互为倒数m的相反数是的倒数则的值为_________.
下面说法正确的有①的相反数是－3.14②符号相反的数互为相反数③－－3.8的相反数是3.8④一个数和
０个
１个
２个
３个
下列语句①﹣5是相反数②﹣5与+3互为相反数③﹣5是5的相反数④﹣3和+3互为相反数⑤0的相反数是0
①②
②③⑤
①④⑤
③④⑤
关于相反数的叙述错误的是
两数之和为0，则这两个数为相反数
如果数轴上两数所对应的点到原点的距离相等，则这两个数互为相反数
符号相反的两个数，一定互为相反数
零的相反数为零
下列叙述正确的是
符号不同的两个数是互为相反数
一个有理数的相反数一定是负有理数
2
与2.75都是﹣
的相反数
0没有相反数
7×﹣2的相反数是
下列说法①若ab互为相反数则a+b=0②若a+b=0则ab互为相反数③若ab互为相反数则=﹣1④若=
1个
2个
3个
4个
式子-的意义是.
3与2商的相反数的平方；
3的平方与2的商的相反数；
3除以2的平方的相反数；
3的平方的相反数除2.
下列说法正确的是
﹣3是相反数
3与﹣3互为相反数
3与
互为相反数
3与﹣
互为相反数
下列说法不正确的是
到原点距离相等且在原点两旁的两个点所表示的数一定互为相反数
所有的有理数都有相反数
正数和负数互为相反数
在一个有理数前添加“﹣”号就得到它的相反数
下列说法中正确的是
正数和负数互为相反数
任何一个数的相反数都与它本身不相同
任何一个数都有它的相反数
数轴上原点两旁的两个点表示的数互为相反数
已知数a－2与2a－3.1若这两数互为相反数则a的倒数是________相反数是________.2
下列结论正确的有①任何数都不等于它的相反数②符号相反的数互为相反数③表示互为相反数的两个数的点到原点
2个
3个
4个
5个
下面说法正确的有①的相反数是－3.14②符号相反的数互为相反数③－－3.8的相反数是3.8④一个数和
０个
１个
２个
３个
下面说法中正确的是
和
互为相反数
和-0.125互为相反数
-a的相反数是正数
两个表示相反意义的数是相反数
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以下所列家庭常用的调味品中与水充分混合后不能形成溶液的是
向一定量的氢氧化钡溶液中逐滴滴加稀硫酸至过量下列图象与该反应事实相符合的是
化学与生活息息相关我们的衣食住行都离不开化学． 1下列服装所使用的材料中属于有机合成材料的是填字母序号． 2人们通过食物获取各种营养素． ①水果和蔬菜富含的营养素是该营养素可以起到调节新陈代谢等作用． ②为了防止骨质疏松人体每日必须摄入足够量的元素． 3二氧化钛TiO2可制作用于家装的白色涂料其中Ti的化合价为． 4汽车是重要的交通工具． ①汽车使用天然气作燃料排放污染较低．天然气的主要成分为． ②完成车用铅酸电池充电的反应2PbSO4+2H2OPb+2H2SO4+．
根据下列实验装置图回答问题 1写出图中标号的仪器名称a． 2制取气体时按要求组装好仪器后应先再添加药品给A装置试管里的固体物质加热时应先然后集中加热盛有药品的部位． 3实验室中用过氧化氢溶液与二氧化锰混合制取氧气发生反应的化学方程式为应选用的发生装置是填装置序号． 4图E所示是细铁丝在氧气中燃烧的实验实验装置中瓶底预先装少量水的原因是． 5用图F所示方法把二氧化碳气体慢慢倒入放有燃着的蜡烛的烧杯中下层蜡烛的火焰先熄灭二氧化碳这种性质在实际生活中的应用是．
木炭还原氧化铜和一氧化碳还原氧化铜的实验装置如图所示． 下列说法正确的是
Sometimespeoplecomeintoyourlifeandyouknowrightawaythattheyaremeanttobethere.Theyservesomesortof1toteachyoualessonorhelp2whoyouareorwhoyouwanttobecome.Youneverknow3thesepeoplemaybe﹣﹣﹣yourroommateneighborprofessorlong﹣lostfriendloverorevenacomplete4butwhenyoulockyoureyeswiththemyouknowatthatverymomentthattheywill5yourlifeinsomedeepway. Andsometimesthingshappentoyouandtheymayseem6horribleandunfairatthetimebut7overcomingthesedifficultiesyouwouldhaveneverrealizedyourpotentialstrengthwillpowerorheart.Everythinghappensforan8.Nothinghappensbychanceor9goodorbadluck.Illnessinjurylovelostmomentsoftruegreatnessandstupidity﹣﹣﹣alloccurto10thelimitsofyoursoul.Withoutthesesmalltestslifewouldbelikeasmoothlypavedstraightflatroadtonowhere.Safeandcomfortablebutdulland11. Thepeopleyoumeetwhoaffectyourlifeandthesuccessand12youexperience﹣﹣﹣theyaretheonesthatcreatewhoyouare.Eventhe13experiencescanbelearnedfrom. Ifsomeonehurtsyoubetrays背叛youorbreaksyourheart14themfortheyhavehelpedyoulearnabout15andtheimportanceofbeing16aboutwhomyouopenyourheartto.Ifsomeonelovesyoulovethemback17notonlybecausetheyloveyoubutbecausetheyareteachingyoutoloveandopenyourheartandeyestothingsyouwouldhave18seenorfeltwithoutthem. Makeeveryday19.Appreciateeverymomentandtakefromiteverythingthatpossiblycanforyoumayneverbeabletoexperienceitagain. Peopleareliketeabags﹣﹣﹣youhavetoputtheminhotwaterbeforeyouknowhow20theyare. 1A.way B.plan C.purpose D.idea 2A.figureout B.giveout C.takeout D.sortout 3A.what B.who C.which D.where 4A.child B.teacher C.classmate D.stranger 5A.affect B.create C.design D.ruin 6A.important B.common C.painful D.practical 7A.after B.on C.by D.without 8A.change B.reason C.effect D.return 9A.bymeansof B.onbehalfof C.intermsof D.withregardto 10A.improve B.decrease C.test D.set 11A.meaningless B.rough C.changeable D.winding 12A.decisions B.failures C.achievements D.lessons 13A.unforgettable B.bad C.unusual D.interesting 14A.appreciate B.ignore C.desert D.forgive 15A.independence B.bravery C.trust D.selflessness 16A.enthusiastic B.cautious C.crazy D.worry 17A.unconsciously B.unconditionally C.carefully D.differently 18A.always B.never C.seldom D.sometimes 19A.count B.mind C.work D.vary 20A.expensive B.fresh C.precious D.strong
短文中共有10处语言错误每句话最多两处错误.错误涉及一个单词的增加删除或修改. 增加:在此处加一个漏字符号∧并在其下面写出增加的词; 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其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处多者从十一处起不计分. Whatmakessmartlearners?Smartlearnersthinkeveryminuteimportantlyandmakefulluseofthem.Inclasstheyalwaysplaytheactiveroleandlistentoteacherscarefullyinordernotmissanykeyinformation.Afterclasstheykeepthehabitofreviewtheirlessonsanddoingtheirhomeworkcareful.Besidessmartlearnerslikediscussingaboutstudyproblemswithbothteachersandfriendssuchthattheycansolvethem.Ihopedallofuswillfindasuitablelearningmethodandhavealotoffunslearning.
下列依据实验目的所设计的实验操作中正确的是
某同学发现上个月做实验用的氢氧化钠溶液忘记了盖上瓶盖．对于溶液是否变质同学们提出了如下假设 【猜想】猜想一没有变质猜想二部分变质猜想三． 【査阅资料】Na2CO3溶液呈碱性． 【进行实验】 【反思】氢氧化钠溶液必须密封保存．氧氧化钠溶液变质的原因用化学方程表示．
化学就在我们身边下列化学知识的整理有错误的是
下列化学肥料中属于复合肥料的是
某篮球队5名场上队员的身高单位cm是183187190200210现用一名身高为195cm的队员换下场上身高为210cm的队员与换人前相比场上队员的身高
认识仪器合理选用装置以及正确处理实验意外事故是化学实验素养的具体体现． 1图1三套装置为实验室制备气体常用的发生装置．仪器a的名称是检验B装置气密性的方法． 21773年瑞典化学家舍勒图2所示装置制备氧气在曲颈瓶中装有硝酸钾和浓硫酸的混合物置于火炉上加热产生的氧气用动物膀胱收集．该实验若改用图1中的发生装置最合适的是填装置下面的字母 3实验室用加热氯酸钾的方法制取氧气时可选用图1发生装置是填字母序号该化学方程式为． 4小明用高锰酸钾制备氧气并用排水法收集实验结束时先熄灭酒精灯导致水槽中的水倒流进入了导气管．可采取的补救措施是写出一种． 5①某同学设计的实验装置如图3既可用于制取气体又可用于探究物质的性质．当打开K1关闭K2时利用ⅠⅡ装置可进行的实验是填字母序号 A．过氧化氢溶液与二氧化锰混合制取并收集氧气 B．锌与稀硫酸反应制取并收集氢气 ‚②当打开K2关闭K1时利用ⅠⅢ装置可以制得并检验二氧化碳写出装置I中反应的化学方程式．
对于下列几种化学符号有关说法正确的是 ①H②Fe2+③Cu④P2O5⑤Fe3+
随着电脑越来越多地进入我们的生活它给我们带来了方便但不当的使用也影响着我们的身体健康.请根据下面所给要点用英文写一篇短文简要说明电脑对人体健康的不利影响并提出改善建议. 1.长时间用电脑损害眼睛影响视力. 2.对电脑的过多依赖造成记忆力减退. 3.电脑前久坐容易引发腰背不适肥胖等症装. 注意: 1.词数100左右;开头已经为你写好不计入总词数. 2.可根据内容适当增加细节以使行文连贯. Ascomputersarebeingusedmoreandmorewidelyinourlifetheyhavebroughtusalotofconvenience.
下列化学符号中数字“2”表示的意义不正确的是
如表是氢氧化钙和氢氧化钠的溶解度数据．请回答下列问题 1氢氧化钠溶解度曲线是选填“甲”或“乙” 2写出两种把接近饱和的氢氧化钙溶液变成饱和溶液的方法． 320℃时95g饱和氢氧化钠溶液中含溶质氢氧化钠的质量为g． 440℃时分别在100g水中加入mg氢氧化钠和氢氧化钙固体可得到溶质质量分数相同的两种溶液则m的取值范围是． 560℃时氢氧化钠的饱和溶液中含少量氢氧化钙把其降温结晶后过滤对滤渣滤液成分分析正确的是． A．滤渣中只有氢氧化钠 B．滤渣中一定有氢氧化钙可能有氢氧化钠 C．滤液中一定有氢氧化钙可能有氢氧化钠 D．滤液中一定有氢氧化钠和氢氧化钙 6氢氧化钙溶液和氢氧化钠溶液都是无色溶液都能与二氧化碳发生反应．氢氧化钠与二氧化碳反应的方程式为2NaOH+CO2＝Na2CO3+H2O．氢氧化钙与二氧化碳反应的方程式为．根据以上信息你认为选填“能”或“不能”用二氧化碳来鉴别这两种溶液． 720℃时欲测定NaOH溶液的pH若先将pH试纸用蒸馏水润湿再进行测定则所测溶液的pH填“偏大”“偏小”或“不受影响”．
OneSundaymyfamilyhadgatheredatmyparents'housetofeastuponMom'swonderfulcooking.DuringthenormaldinnerchatterInoticedthatmyfatherwasslurring说话含混hiswords.NoonementionedthisduringdinnerbutIfeltcompelledtodiscussitwithmymotherafterward. WedecidedthattherewassomethingseriouslywrongandthatDadneededtoseethedoctor. Momphonedmetwodayslater.Thedoctorfoundabraintumor肿瘤.It'stoolargeatthispointtooperate.Maybetheycandosomethingthenbuttheoddsarelong. Evenwiththetreatmentmyfather'sconditionworsenedandthedoctorfinallyinformedusthatthisconditionwasterminal.DuringoneofhisstaysinthehospitalwebroughtourbabydaughterChelseywithuswhenwevisitedhim.Bythistimehehadgreatdifficultyspeaking.IfinallyfiguredoutthathewantedChelseytositonhisstomachsohecouldmakefacesather. WatchingthetwoofthemtogetherIrealizedIwaslivinganexperiencethatwouldstaywithmeforever.ThoughgratefulforthetimestheycouldshareIcouldn'tshakethefeelingofaclocktickinginthebackground. Onthevisittomyparents'homeduringwhatweallknowwasmyfather'slastdaysmymothertookChelseyfrommyarmsandannouncedYourfatherwouldliketoseeyoualoneforaminute. Ienteredthebedroomwheremyfatherlayonarentedhospitalbed.Heappearedevenweakerthanthedaybefore. HowareyoufeelingDad?Iasked.CanIdoanythingforyou? Hetriedtospeakbuthecouldn'tmakeoutaword. I'msorrybutIcan'tunderstandyouIsaid. WithgreatdifficultyhesaidIloveyou. Wedon'tlearncouragefromheroesontheeveningnews.Welearntruecouragefromwatchingordinarypeopleriseabovehopelesssituations.Inmanywaysmyfatherwasastrictuncommunicativeman.Hefounditdifficulttoshowemotion.ThebravestthingIeversawhimdowasovercomethatbarriertoopenhishearttohissonandfamilyattheendofhislife. 1WhichofthefollowingstatementsisTRUE? A.Thewriteraccompaniedhisfathertoamedicalexamination. B.Thewriter'sfathergotworseaftertheremovalofthebraintumor. C.Thewriter'sfatherhadknownabouthisillnessbeforethewriterdiscoveredit. D.Thewriterwasquicktonoticethestrangeconditionofhisfather. 2Whatdoestheunderlinedsentencetheoddsarelongmean? A.IttakesalongtimeforFathertorecover. B.There'slittlepossibilityforFathertorecover. C.Fatherneedsloveandcarefromhisfamily. D.TheyneedapropertimetooperateonFather. 3ThefatherhadneversaidIloveyoutothewriterbeforebecause. A.hewasnotusedtoopenlyshowinghisemotions B.hewasnotsoattachedtothewriter C.hethoughttherewasnoneedtotellthewriter D.hebelievedinstrictnessandpunishment 4Whatdoesthewriterattempttotellus? A.Lifeisshortsoliveyourlifetothefullest. B.Don'twaittoseeadoctortillitistoolate. C.Bravelyexpressyourloveforyourfamily. D.Wedon'toftenvaluehealthuntilweloseit.
如图是由四个相同的小正方体组成的立体图形它的俯视图为
﹣4的倒数是
VisitingJoshuaTreeNationalParkCalifornia JoshuaTreeNationalParkisnearly800000acreslargeandsurroundspartsoftheMojaveandColoradoDesertsinSouth﹣centralCalifornia.Althoughbarrenatfirstglancetheparkisfullofwildlifeandprovidesavarietyofentertainmentactivitiesfromhikingtoclimbing.Withinathree﹣hourdriveJoshuaTreeNationalParktakesatleastafulldaytovisit. Thingstodo •Hikingopportunitieswithintheparkincludeseveralchoicesfrom12self﹣guidednatureroutinestoall﹣dayback﹣countryhikes. •JoshuaTreeNPhasninecampinggroundsandback﹣countrycampingisalsoallowed. •Rockclimbingisapopularactivityintheparkwhichhas10mountainsgreaterthan5000feetinheight. Whentovisit JoshuaTreeNPisopen365daysayearalthoughthebesttimetovisitisOctoberthroughAprilwhentemperatureismilder.Thepeakseasoniswhenthewildflowersbloomandthesummermonthsaretheleastcrowded. Whattobring Inadditiontoyourcameraandtelescopebesuretocarrylotsofwater.Parkandguidingmapscanbepickedupatanyofthethreevisitorcenters. Fees •Parkingfees:Youcanbuyaseven﹣dayvehiclepermit周票for﹩15asingleentrypermitfor﹩5orJoshuaTreeNationalParkannualpassfor﹩60. •Campingfees:Theyvarybycampingground 1Theunderlinedwordbarreninthefirstparagraphcanbereplacedby. A.rich B.beautiful C.deserted D.useless 2WhenisthebesttimetovisitJoshuaTreeNP? A.March B.May C.June D.September 3IfonegoestoJoshuaTreeNPbycarandstaystherefor9dayshowmuchatleastoneshouldpayfortheparkingfees? A.﹩60 B.﹩15 C.﹩25 D.﹩30 4Whatcanbeinferredfromthetext? A.Thereareguidesfornaturetrails. B.Touristscaneasilyvisitthewholeparkwithinaday. C.Thecampingfeesattheninecampinggroundsaredifferent. D.Touristsmusttakeparkandtrailmapswiththemwhentheyvisitthepark.
Istheresuchathingasbeingover﹣protective? Icanhonestlysaythatmyanswertothatquestion1changedramatically戏剧性地sinceIbecameaparent. BeforethebirthofmydaughterItaughtat2privateschooloftenviewingmystudentsasover﹣protectedworrying3wouldhappenwhentheywentontomiddleschools. Somedidfineandsomedidnot.Someneededconstantpatsonthebackwordsof4encourageandextrasupportwhichI5happygave.Otherswerecontentontheirownneedinglittleornointeraction互动withtheirteacher.6forthemostpartgraduateswouldgoonforhigherschooling. I'dalwayssupposedtheirparentswereover﹣protectivefortheyweretheonesthatstillwalkedtheir7fivegradersintotheclassroomandmetthemattheschoolgate. AdmittedlyIlaughedatthoseparents8thinktheirchildrenwouldneverlearntobe9independenceiftheydidn'tletgojustalittle.ThenIhadmyowndaughter.ThemomentIlookedatherlittlefaceI10knowI'ddoeveythinginmypowertoprotectherandmakesureshealwaysfeltsafe!
如图所示滴管中有液体甲小试管中盛放着固体乙足量广口瓶中有少量饱和的澄淸石灰水试管底部浸没在澄淸石灰水中．当把甲溶液滴加到乙中后过一会儿可看到石灰水变浑浊了同时U形管中的a液面降低b液面升高了．根据以上现象请你分析下列说法不正确的是
假定你叫李华你班同学约定本周日上午9点在市中心公园的小树林边聚会想邀请你们的外籍英语教师Sally参加.请根据下图指示给她写一封e﹣mail告诉她如何到中心公园找到你们. 注意: 1.词数:100左右开头和结尾己为你写好不计入总词数; 2.可适当增加细节以使行文连贯. DearSally Thestudentsinourclassaregoingtohaveaget﹣togetherintheCentralParkat9thisSunday. Yours LiHua
IfyouliveinTokyoorTorontoyouneedawarmcoatinthewinter.1Theaimofadvertisingistochangeourideasaboutthingswewantandneed. Someadsfordesignerproductsusepeople'svanity虚荣心toselltheproduct.Theadstrytocreateapersonalityforeachbrand.Forexampleonebrandofwatchesisforpeoplewholikeadventurewithadsfeaturinganautoracerorapilotwearingthem.Anotherbrandofwatchesisforelegantandfashionablepeopleandtheadsshowwealthytravelersonacruiseship.Thewatcheslookalmostthesame﹣onlytheirimagesaredifferent.Whenyoubuythatbrandofwatchyouarebuyingtheimage.2 Manyadsusepeople'semotionstopersuadeusthatweneedtheproduct.ThinkofaTVcommercialthatshowsawomanoutdrivinginacaronarainydaywithhertwosmallchildren.Suddenlyanothercarturnsinfrontofher.Themotherquicklyhitthebrakesandhercarcomestoastop.Thechildrenarestillsmilingandlaughing.Themessageis:Thiscarwillkeepyousafe.3Otherexamplesareslogansthattellyoutotakevitaminstopreventheartdiseaseorbuyinsurance﹣protectyourfamily. Commercialsforsoftdrinksoftenshowpeoplehavingapartyplayingsportsorenjoyingadayatthebeach:Everyoneintheadishavingagoodtime.Themessageis:Ifyoubuythisdrinkyouwillhaveagoodtimetoo.Manyadslikethisarebasedonpeople'sdesireforfunandenjoyment. 4Psychologistshavefoundthatpeoplehavepositivefeelingsaboutthingstheyseemoreoftensothesameadisusedforalongtimebeforeitisreplacedwithanewad.OtherstudiesfoundthatpeoplereactbettertoanadwhenitisfreshintheirmemorysoTVadsarerepeatedveryoften. Knowingaboutpsychologyinadvertisingletsusmakebetterdecisionsaboutthethingswebuy.5 A.Advertisementslikethisoneusefeartosellproducts. B.Butyouwantonethatisshortorblackorhasadesignerbrand. C.YouhavetobecarefulnottobefooledbytheadsontheInternet. D.Butthechildrenmaynotrealizethatwhattheyareviewingisunreal. E.Thisisthereasonthatpeoplespendmuchmoremoneyforaproduct. F.Afteranadispreparedadvertisersusepsychologytomakeitmoreeffective. G.Ithelpsusknowthedifferencebetweenwhatwewantandwhatwereallyneed.
Askilledtravelercantakeataxibuyfoodinamarketandgetdirectionsfromastrangerthroughhandgesturesalone. Thingscangetlostintranslationwhenatypicalgesturefromyourcountrymeanssomethingcompletelydifferentinotherpartsoftheworld. BelowaresomecommonNorthAmericangesturesthatoftencauseproblemsabroad. 1.VinAustraliaandEngland In1992GeorgeBushvisitedAustraliaandfromthewindowofhiscarhelduphisindex食指andmiddlefingersintheVshape.ThisVmeansvictoryinEnglandorpeaceinNorthAmerica.Toobaditmeansupyours.inAustralia. 2.OKinFrance MakingacirclewithyourfingermeansgreatorfineinNorthAmerica.It'salsousedbydiverstocommunicatethattherearenoproblems.InFrancehoweverthisgesturemeanszero.Unlessyou'remotioningtoaFrenchdiveryoumightbecommunicatingthatsomethingorsomeoneisworthless. 3.One﹣handedgivinginJapan IntheWestpeoplearen'tespeciallymindfuloftheirhandswhentheyofferobjectstoothers.InJapanitispoliteandexpectedforpeopletomakeofferingswithbothhands.Ifyougivesomeoneabusinesscardorhandthemyourcameratotakeaphotobesuretopassontheitemwithbothhands.Thisshowsthatyouarefullyattentiveandcarefulintheoffering.Aone﹣handedpresentationmightbetakenasdismissive蔑视的. 4.GotyourNose!inTurkey Amanwiththegesturedoesn'thaveasetNorthAmericanmeaningexceptwhenplayinggotyournosewithachild.ItalsomeanstheletterTinAmericanSignLanguage.InTurkeythisgestureisaggressivelyrude. 1IfyouwanttoexpressyoursatisfactioninNorthAmericayoucanuse. A.Vgesture B.OKgesture C.Thumbs﹣up D.Gotyournose 2Whatcanweinferfromthepassage? A.Thegesturesarethesamearoundtheworld. B.AvgestureinEnglandmeanspeace C.AOKgestureinAmericameansZERO D.YouhadbettergivesomeonesomethingwithbothhandsinJapan. 3Whichpartdoesthepassagebelongtoinnewspaper? A.sports B.education C.food D.tourism 4Whomightbeinterestedinthispassage? A.Americans. B.Japanese. C.Frenchmen. D.Englishmen.
JohnSandwasoneofthemostinfluentialteachersIhaveevermet.Duringhighschoolhetaughtmemorethananyotherteacherhadbeenableto. Hedevelopedunusualmethodsofteaching.Hedidnotgiveushomeworkonthefirstdayandhaveitduethenext;insteadhegaveusahomeworkscheduleforthetermandleftituptoustoremembertodoit.Bydoingsohepreparedusforlifeafterhighschoolwhereitwouldbeuptoustomakeourownworkschedule. Mr.Sandwasafamilyman.Hemadeuseofwhatevertimewehadleftinclasstoshowushislatestvacationvideosorhischildren'ssportsvideos.Itwasnicetoseeamanwhobalancedhisfamilyandhiscareersonicelyinaworldwhereabrokenhomeistheaveragehome. Mr.Sandalwaysencouragedustogetoutofourlittleclose﹣mindedsocietyofWethersfieldandexploretheculturesoftheworld.HewouldtellusstoriesofhistravelsacrossEuropeandhisadventuresaroundtheUS.Manyteachersjustforcedtheideaofcollegeandignoredourneedtoreachoutsideofwhatweknow. ManypeoplemaynoteverhaveateacherlikeMr.Sand.Ifeelsorryforthem.Mr.Sandtaughtmethingsthatwentbeyondthecurriculum课程andletmeknowhowpowerfulateacher'sinfluencecouldbe. 1HowdidMr.Sanddealwithstudents'homework? A.Healwaysavoidedgivingit. B.Hepunishedthosefailingtofinishit. C.Hewantedstudentstoberesponsibleforit. D.Hespentenoughtimeeverydaycheckingit. 2WhatdoweknowaboutMr.HandfromParagraph3? A.Heonlyhadonechild. B.Hedidn'thaveagreatloveforlife. C.Helikeddoingsportsafterwork. D.Hevaluedhisjobaswellashisfamily. 3Mr.HandsharedhistoursaroundEuropewithhisstudentsto. A.leadthemtoknowmore B.encouragethemtobecomebrave C.inspirethemtocareforothers D.showthemhowtospendtheirfreetime 4Whatwouldbethebesttitleforthetext? A.TeachersIlikebest B.Anoutstandingteacher C.Teachingagreatcareer D.Howtobeacaringteacher
图示中A～F是教案备课库常见的物质按单质氧化物酸碱盐分类ABCDE是五种不同类别的物质F是大理石的主要成分．图中“﹣”表示相连的两种物质之间可以发生反应“→”表示物质间存在着相应的转化关系部分反应物生成物及反应条件已略去．请回答 1物质F的化学式． 2反应②的化学方程式． 3反应①的基本反应类型是． 4E的用途是．
甲乙两种固体物质的溶解度曲线如图所示请回答 1℃时甲和乙两种物质的溶解度相等． 2欲将一定温度下乙物质的饱和溶液变为不饱和溶液可采用的方法是． 3将等质量甲乙两种物质分别配成t2℃时的饱和溶液需要水的质量大小关系是甲乙填“＞”“＝”或“＜”．
2018年3月22日是第26届“世界水日”我国的宣传主题是“实施国家节水行动建设节水型社会”．再生水的循环使用是城市节水的主要措施之一．“再生水”是城市污水经处理后达到国家水质标准的中水中水是指介于自来水和污水之间的水．下列有关水的说法中错误的是
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与2.75都是﹣
的相反数 0没有相反数
互为相反数 3与﹣
互为相反数
和
互为相反数 
和-0.125互为相反数 -a的相反数是正数 两个表示相反意义的数是相反数
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