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在下列实数中，无理数是（ ）
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下列说法中正确的是
有理数都是实数
不带根号的数一定不是无理数
实数都是无理数
无理数都是开方开不尽的数故无理数都是实数
在下列实数中是无理数的为
） 0 （
）－3.5 （
）
（
）
在下列实数中无理数是
2
3.14
在下列实数中无理数是
sin45°
3.14
下列说法正确的是
无限小数都是无理数
带根号的数都是无理数
无理数是无限不循环小数
实数包括正实数．负实数
下列结论中正确的是
数轴上任何一个点都表示唯一的有理数
两个无理数的乘积一定是无理数
两个无理数之和一定是无理数
数轴上的点和实数是一一对应的
下列说法①有理数包括正有理数0负有理数②无限小数是无理数③数轴上的点不是表示有理数就是表示无理数④实
① ③
② ④
② ③
③ ④
下列说法①②数轴上的点与实数成一一对应关系③－2是的平方根④任何实数不是有理数就是无理数⑤两个无理数
2个
3个
4个
5个
在下列实数中无理数有个.2.020020002πºtan30°.
2
3
4
5
下列说法中正确的有个1无限小数都是无理数2无理数都是无限小数3正实数包括正有理数和正无理数4实数可以
1
2
3
4
在下列实数中中无理数有有理数有
下列说法正确的个数是.1两个无理数的和必是无理数2两个无理数的积必是无理数3无理数包括正无理数0负无
1
2
3
4
下列说法不正确的是
有理数和无理数统称为实数
无理数是无限不循环小数
无理数包括正无理数．零．负无理数
无理数都可以用数轴上的点来表示
下列命题错误的是
所有的实数都可用数轴上的点表示
等角的补角相等
无理数包括正无理数，0，负无理数
两点之间，线段最短
在下列实数中无理数是
5
0
下列命题中正确的是
无理数包括正无理数．0和负无理数
无理数不是实数
无理数是带根号的数
无理数是无限不循环小数
下列说法正确的是
实数不是有理数就是无理数
无限小数都是无理数
带根号的数都是无理数
两个无理数的和一定是无理数
在下列实数中无理数是
5
0
在下列实数中无理数是
5
0
下列结论中①两个无理数的和是无理数②两个无理数的积是无理数③无理数包括正无理数0负无理数④最小的实数
1个
2个
3个
4个
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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?
下列实验方案不合理的是
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.
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
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.
某校化学兴趣小组学习了气体的制取和收集后对相关知识进行总结请你一起参与并完成下面内容 1写出下列仪器名称ab． 2请写出装置A制取氧气化学方程式．若用E装置收集氧气则氧气应从口通入填“c”或“d” 3装置BC都可用来制取二氧化碳装置C相对于装置B在操作方面的优势是． 4加热碳酸氢钠NaHCO3固体来制取CO2应选用的发生装置为若用F收集CO2并测量生成的CO2气体的体积其中在水面上放一层植物油目的是植物油上方原有的空气对实验结果填“有”或“无”明显影响．
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.
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.
下列化学用语与含义相符的是
下列关于实验现象的描述正确的是
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.
下列有关金属的说法不正确的是
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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