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判断题：符号不同的两个数一定互为相反数． （判断题）
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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
判断题3.25与-3互为相反数．判断题
判断下列语句是否正确． 1﹣7的相反数是﹣7．判断题 2﹣7是相反数．判断题 37和﹣7互为
下列判断不正确的有①互为相反数的两个数一定不相等②互为相反数的数在数轴上的点一定在原点的两边③所有的
1个
2个
3个
4个
判断题两数相乘如果积为0则这两个数全为0
判断题任意不同号的两个数的和一定小于它们的差的绝对值.
判断题两个数的和一定大于这两个数的差;
判断题数轴上表示a的相反数的点一定在原点的左边．判断题
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
判断题1任何正数都有两个立方根它们互为相反数．．判断题2负数没有立方根．．判断题3若一个数的立方根是
判断题两个数的和的绝对值一定等于这两个数绝对值的和
判断题下列语句是否正确.正负号相反的两个数叫做互为相反数．判断题
两个数的和一定比这两个数的积小．判断题
判断题正确的打√错误的打×任意一个数都有两个平方根它们互为相反数．判断题
判断题一个负数的相反数一定比它本身大.
正数的平方根有两个它们互为相反数．判断题
判断题下列语句是否正确.一个数的相反数的相反数等于原来的数．判断题
下列说法不正确的是
正数的相反数是负数，负数的相反数是正数
和原点距离相等的两个点所表示的数一定互为相反数
符号不同的两个数互为相反数
两个数互为相反数，这两个数有可能相等
判断题两数的差一定小于被减数;
下列判断中不正确的是
正数的相反数是负数，负数的相反数是正数
在数轴上，和原点距离相等的两个点所表示的数一定互为相反数
符号不同的两个数互为相反数
两个数互为相反数，则这两个数有可能相等
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燃料电池的基本组成为电极电解质燃料和氧化剂．此种电池的能量利用率可高达80%产物污染也少．下列有关燃料电池说法错误的是
如图所示传送带的右边平滑对接倾角为30°的光滑固定的斜面左边对接固定的挡板传送带ab的长度l＝2.0m它始终以v＝3.0m/s的速度顺时针转动．现将一个可视为质点的小物体由c点静止释放bc距离L＝1.4m小物体与传送带表面的动摩擦因数取g＝10m/s2．求 1小物体运动到传送带的下端a点时的速率 2若小物体与挡板相撞时无机械能损失试通过计算说明小物体能否与挡板发生第二次相撞．
下列各分子中所有原子都满足最外层为8电子结构的是
以下说法正确的是
Thetermtoextendanolive橄榄branchmeanstomakeanofferofpeaceorreconciliation和好.ThistermhasBiblicalshèng jīng 的originscomingfromthesectionoftheOldTestamentthatdealswiththefloodthesignthatthefloodisoverisanolivebranchbroughtbacktotheark方舟byadove.OlivebrancheswerealsosymbolsofpeaceinAncientGreeceandRomeandtheycontinuetobeusedinvariousworksofartthataremeanttosuggestpeace. Somepeoplehavesuggestedthattheolivewasaverydeliberateandwell﹣consideredchoiceasametaphor比喻forpeacebecauseolivetreesfamouslytakeyearstomature.Waristypicallyveryhardonthetreesbecausepeoplecannottakethetimetonurturethemandplantnewones.Thereforetheofferofanolivebranchwouldsuggestthatsomeoneistiredofwarwhetheritisanactualwarorafallingoutbetweenfriends. InAncientGreekandRomantimespeoplewouldofferactualolivebranches.InRomeforexampledefeatedarmiestraditionallycarriedolivebranchestoindicatethattheyweregivinginandtheGreeksusedthemintoweddingsandotherceremonies.Inthemodernerathebranchisusuallymetaphoricalratherthanactualnotleastbecausetheplantscanbeabitdifficulttoobtain. Manypeopleagreethatpeacenegotiationsatalllevelsofsocietyareagoodidea.Betweennationsobviouslyitisimportanttoextendanolivebranchtoensuremutualsafetyandtohelptheworldrunmoresmoothly.Thisactcanalsobeimportantonapersonallevelasresolvingconflictandlearningtogetalongwithothersisviewedasanimportantlifeskillinmanycultures. Atsomepointintheirlivesmanypeoplewillbeadvisedtoextendanolivebranchtosettleadisputeorresolveanissue.Somepeoplebelievethatittakesanimmenseamountofcouragetotakethisactionasitoftencomeswithanadmissionofwrongdoingandregret. 32.AccordingtotheBible. A.anolivebranchsuggestsfloodiscoming B.thearkismadeofolivetreewood C.anolivebranchmeansfloodisover D.adovelovestosettleontheolivebranch 33.TheoliveisconsideredagoodchoiceasametaphorforpeaceforthefollowingreasonsEXCEPT. A.olivetreesfamouslytakeyearstomature B.olivebranchesmakepeopletiredofwar C.waristypicallyveryhardonthetrees D.peoplecannottakethetimetonurturethemwhileatwar 34.Whyareactualolivebranchesseldomusedinmoderntimes? A.Olivetreesarebeingprotectednow. B.Olivetreesareplantedonlyincertaincountries. C.Olivetreescanbefartoseek. D.Thereisnoneedtouserealolivebranches. 35.Itcanbelearnedfromthetextthattoextendanolivebranch. A.isnotimportantonapersonallevel B.isonlyimportantbetweennations C.takesalotofcourage D.isanimportantlifeskillinmanycultures.
Listedherearefourofthethousandsofimpressivemuseumsaroundtheworld. TheGuggenheimMuseumBilbaoinBilbaoSpain Builtin1997theGuggenheimMuseumBilbaoisoneofthenewestintheworld.IthastransformedtheindustrialcityofBilbaointoatraveler'sdesireddestination.Thebeautifularchitectureofthemuseumhasprovidedadramaticbackgroundformoviesandcommercials. TheLouvreinParisFrance ProbablythemostfamousLouvrealsoholdsthemostfamouspaintingintheworldtheMonaLisabyLeonardodaVinci.Crowdscanbefoundanydaysurroundingthesmallbutmysteriouspaintingofthesmilingwoman.ButtheLouvreismuchmorethanahometotheMonaLisa.TheLouvreisvisitedbymorepeopleeachyearthananyothermuseumintheworld. TheBarnesFoundationinPhiladelphiaAmerica Justopenedinitsnewdowntownlocationin2012theBarnesFoundationisuniqueinthatitisacompletelyreproduceddisplayfromoneman'sprivatecollection.Dr.AlbertC.Barnesstartedcollectingartintheearly20thcenturyandcollectedamongothersthelargestnumberoforiginalRenoirpaintingsintheworld. TheUffiziGalleryinFlorenceItaly Walkingonthemarbledfloorsfeelslikesteppingbackintime.Thebuildingitselfisabeautifulpalace﹣likestructurewithfrescoes湿壁画decoratingtheceilingsandwalls.Viewersarebowledover印象深刻bytheworksbyBotticellisuchasTheBirthofVenus.Classicartworksfromnearly1000yearsagodescribereligiouseventsofthetime. 21.Whichofthefollowingisthemostpopular? A.TheLouvre. B.TheGuggenheimMuseumBilbao. C.TheBarnesFoundation. D.TheUffiziGallery. 22.WhatmakestheBarnesFoundationparticular? A.Itsstructure. B.Itscollection. C.Itslocation. D.Itshistory. 23.Whattypeofwritingisthistext? A.Anactivityposter. B.Anexhibitionannouncement. C.Anartshowreview. D.Atravelguide.
Ihadbeenstaringatthewhitewallsofthevideogamestoreforabout2hourssincelunch.Itwasavery41day.Iglancedatthetableinfrontofthestoreandmyheart42.ItwasthedonationtableforthevictimsofTyphoonYolandaandeventhoughIhaddonatedwhatIcouldI43feltsadwheneverIsawthepeopleontheTVsuffering. Iwasbrokenoutofmy44whenthedoorsgotopen.Customers45! Shewasasmallgirlabout10or11.Hermotherwasaccompanyingherwithafewplasticbags.I46hermom.WhenIwassellingcigarettesonthestreetIsawhersellingclothesshe47herselfatthemarket. Thedaughterjusthada48andhermomfinallyhad49moneytobuyaPS3andsomegames. Thegirlhalf﹣joggedhalf﹣skippedtomycounter.She50herbackpackandpulledoutaconsole操纵板.Hermomhandedmethebagfullofgames. CanI51this? Suresweetienoproblem. Iinspectedtheconsoleandthegamesandnothingwasopened.Accordingtoour52Ireturnedthe53tothemom.Shehandedittothegirl.Andthegirlranoffasfastasherlittlefeetcouldtakeher.Iwasabouttoaskwhenthemomseeingmy54explainedShewantstosellherbirthday55soshecandonatetothe56. Shewas57togiveupwhatwassupposedtobehersandgavetothose58.That'srealgenerosityoutthere. 59IwaswatchinghertalkingtothegirlatthedonationstableIwasremindedthateventhoughtherearealotof60peopleintheworldtherearestillthosepeoplejustlikethatlittlegirl. 41.A.good B.cold C.warm D.slow 42.A.beat B.ached C.ran D.sank 43.A.almost B.also C.still D.never 44.A.moods B.dreams C.pains D.thoughts 45.A.firstly B.finally C.quickly D.excitedly 46.A.greeted B.found C.recognized D.told 47.A.wore B.made C.washed D.bought 48.A.date B.job C.birthday D.disease 49.A.enough B.little C.easy D.big 50.A.carried B.opened C.sold D.left 51.A.buy B.change C.return D.donate 52.A.plan B.decision C.discussion D.regulation 53.A.money B.backpack C.games D.receipt 54.A.smile B.expression C.unhappiness D.difficulty 55.A.card B.cake C.surprise D.gift 56.A.victims B.workers C.charities D.typhoons 57.A.grateful B.willing C.unhappy D.afraid 58.A.poor B.unfortunate C.indanger D.inneed 59.A.Since B.Until C.While D.Although 60.A.selfish B.unlucky C.poor D.rich
假定你是李华是你校读书俱乐部的负责人计划在下个月组织英语读书节. 请给你的美国笔友Tony写信介绍本次活动并请他为本次读书节推荐阅读书目. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯 3.信的开头和结尾已给出不计入总词数. DearTony Lookingforwardtoyourearlyreply! Yours LiHua.
SashaObamadaughterofUSPresidentBarackObamahasswappedthecomfortsoftheWhiteHousefor61seafoodrestaurant. The15﹣year﹣old62takeasummerjobservingfoodatthebusinessinMartha'sVineyardMassachusettsrecently.Sashausing63fullnameNatashahasbeenaccompaniedtotherestaurantbyateamofsixsecretserviceagentstheBostonHeraldreports. Thetownhasbeenafavorite64locatefortheObamasontheirsummerbreaks.Photographsshowthepresident'syoungestdaughter65weartherestaurant'suniformofblueT﹣shirtandcapandworkingatatill在收银. Aco﹣workertoldtheHeraldShe'sbeenworkingdownstairsattakeout.Wewerewondering66thereweresixpeoplehelpingthisgirlbutthenwefound67whoitwas. TheWhiteHousehasnotcommentedonthereportbutFirstLadyMichelleObamahasspokenabouttryingtobringhertwodaughtersupas68normalaspossible. AswellasworkingonthetakeawaycounterSashaObama'sother69dutyreportedlyincludewaitingontablesandhelpingtopreparetherestaurantforitslunchtimeopening. Hersecurityteamhasbeenseenwaitingnearbyinalargecarorsittingonbenches70theFirstDaughterdealswithtourists'meals.
WarmweatherbroughtbyElNinohashadmixedeffectsonanimalsinusuallysnowyplacesinNorthAmericaincludingNewEnglandaccordingtoanAssociatedPressarticle. Someanimalsseemtobenefitfromhavingachancetogathermorefoodbeforewinterandfromexpendinglessenergyindailysurvivalmode.Otherslikesnowshoeharesareputatcenterstageinpredators'捕食者viewwhentheylacksnowfordisguisingtheirwhitefur﹣notagodthingforthemofcourse. Blackbearsontheotherhandhavebeenkeepingbusygatheringnutsandappleswhentheywouldnormallyhavesettledintotheirwinterhomesbynow.VermontandMassachusettsofficialshaveaskedresidentstowaittillsnowfallstotakeouttheirbirdfeedersforthesakeofsafetythearticlesaid. Wesuggestwaitingfor6ormoreinchesofsnowthatlastsbeforetakingoutyourbirdfeedersespeciallyifyouhavebeenvisitedinthepastbybearsoriftherearesightingsofbearsinyourneighborhoodForrestHammondVermontFishandWildlife'sbearbiologistsaidinthearticle.Duetolackofsnowandfrozengroundbirdsareabletoseekfoodinfieldsandforestsfortheirnaturalfoods. Snowamountscanalsodeterminehowcomfortablebearsareandhowquicklytheyconsumetheiraccumulatedfatduringhibernation冬眠notedHammondinthearticle.Thisisbecausesnowcoversandtrapsthemintheirwinterhomesandalsohidesthemfrompredators. 28.WhatmayupsetsnowshoeharesbecauseofElNino? A.Theirbeingcaughtmoreeasily. B.Theirfailingtogathermorefood. C.Theirconsumingmoreenergy. D.Theirlosingsightoftheirenemies. 29.Whydidtheofficialsaskpeopletokeepbirdfeedersuntilsnowfalls? A.Theymanydisturbbears. B.There'snoneedtodoso. C.Toavoidattractingbears. D.Forthesafetyofbears. 30.Whatdothebearbiologist'swordsimply? A.Aheavysnowisontheway. B.Bearsarecommonnowadays. C.Bearslivemainlyonbirdsinwinter. D.Warmweatherbenefitsbirdsinwinter. 31.Whichofthefollowingisthepropertitleforthepassage? A.WarmWeatherHelpsAnimalsSurvive B.SnowAmountsDetermineAnimals'WinterLife C.MeasuresShouldBeTakenToProtectWildlife D.LackofSnowAffectsNorthAmericanAnimals.
已知反应A+3B⇌2C+D在某段时间内以A的浓度变化表示的化学反应速度为1mol•L﹣1•min﹣1则此段时间内以C的浓度变化表示的化学反应速率为
Peoplelieallthetimebutdependingonhowskilledtheyare.Itcanbedifficulttodeterminewhensomeoneislyingtoyou.Doyouknowhowtorecognizethesignsthatsomeoneislyingtoyou?36 1.Liarsmakefalseeyecontact. Apersonwhoislyingtoyouwon'tmakeeyecontactwithyouortheymaketoomucheyecontact.Ifapersonislyinghemayfeelyouarewatchinghimandhewilllookdownatthefloororawayfromyoureyes.Somepeopletrytostareatyouinthefaceinadeliberateway.37 2.Liarsavoidusingcontractions缩略语 TheliarswillsayIdidNOTnoticeyourmoneyinsteadofIdidn'tnoticeyourmoney.Thisisanattemptbytheliarstobeabsolutelyclearwhattheymean.38 3.WeirdStrangeBodyLanguage. Liarsoftenfeeluneasyturnawayfromthepersontowhomtheyarespeakingblinkrapidlysmilelessandhavepitchchangesintheirtoneofvoice.Theymaycrosstheirarmswhichisasignofbeingclosedortryingnottorevealtoomuchinformation.39.Theycouldtouchpartsoftheirfaceanearoranoseorplaywithkeysoranotheritemthattheyhaveintheirhand. 4.Liarsprovideadditionalinformationwithoutbeingaskedforit. 40.Theresultisthemorecomplicatedthestoryisthelessbelievableitwillbe.Youwillhavethefeelingthatnothingcouldbefurtherfromthetruth. A.Usuallyitendsupmakingthestoryalotlessbelievable. B.Herearesomeeasywaystohelpyourecognizeliarsandcatchlies. C.Sometimespeoplewilllookunnaturalwhentheyarelying. D.Theywillgetangryifyoudoubttheirstory. E.Theyseemtothinkthatbytellingtheirstoryindetailyouwillfinditmorebelievable. F.Theytrytochangethesubjectormovetheconversationinadifferentdirection. G.Inthiswaytheyfeellikemakingeyecontactwillmakewhattheyaresayingmorebelievable.
在一定温度下的恒容密闭容器中能说明反应X2g+Y2g⇌2XYg已达到平衡的是
假设你是李华尽管你很努力但在最近的英语考试中又不及格你很烦恼父母和老师对此也有些担心.请给你的英国笔友Tom写一封电子邮件告诉他你的情况并向他求助如何学好英语.邮件要点如下 1.向Tom倾诉你的烦恼 2.请教他如何学好英语. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯 3.开头和结尾已为你写好不计入总词数. DearTom Howareyou? Iamlookingforwardtoyourreply. Yours LiHua.
硫代硫酸钠溶液与稀硫酸反应的化学方程式为Na2S2O3+H2SO4＝Na2SO4+SO2+S↓+H2O下列各组实验中最先出现浑浊的是
假定英语课上老师要求同桌之间交换修改作文请你修改同桌写的以下作文.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. 删减把多余的词用斜线\划掉. 修改在错词下面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. LastFridayourschoolorganizedustoafirestationwhatwehadexpectedforseveralday.Whenwegottherethefire﹣fighterswelcomedusbutledusintoanexhibitionhall.Thereoneofthemdeliveredthelectureonfirecontroltous.Afterthattheyshowushowtooperateafireextinguisherandevengaveourchancestopractiseusingit.NowIdaresayIcanuseitskillful!Onourwayhomewecouldn'thelptotalkingaboutwhatwehadexperienced.Wefeltveryhappyandexcitedbecausewehadgainedsomanyknowledgeaboutfirecontrolandknownwhattodoanemergency.
MobilephonesandiPadsarenowwonderfultoolsforlearningandteachingEnglish.Withthehelpofthethousandsofeducationandlanguageappsavailableonlinestudentscanmakeeffectiveuseofthemtolearninaninteractiveenvironment.GivenbelowisalistofsomeofthebestappsforlearningandteachingEnglish. GrammarUp GrammaristheheartofanylanguageandthustheGrammarUpappisoneofthemosthighlyrecommendedappsforEnglishlearners.Thisappisspecificallydesignedforpeoplewhowanttoimprovetheirgrammarvocabularyandwordselection.Itconsistsofmorethan1800multiple﹣choicequestionsgroupedundertwentydifferentgrammarcategories. iFPoems iFPoemsisafantasticappforpoetrylovers.Thisappconsistsofagreatcollectionofpoemsfromfamouspoetsaroundtheworld.Italsoallowsuserstosavetheirfavoritesalongwithrecordingtheirownreadingsofthepoems. iBooks iBooksisacompletebooklibraryfortheiPadusers.ItincludestheiBookstoreandallowsuserstodownloadandreadbooks.Theappfeaturesabeautifulbookshelfonwhichyoucanbrowsevariousbooksorevenaddnotestoyourfavoriteparagraphsinthebook.Youcanalsocreateyourowntextsanduploadthemintotheapp. SpeakingPal RecommendedasoneofthebestappsforEnglisheducatorsandlearnersSpeakingPalallowsyoutorecordyourspeechandcompareitwithanativeEnglishspeaker.ThisamazingappcombinesvideowithautomaticspeechrecognitionsoftwarethattestsyourEnglishspeakingskills.YoujusthavetospeakwithavideocharacterandgetimmediateresponseonhowwellyouspeakEnglish. 21.Whatdotheseappshaveincommon? A.Theycanbefoundonline. B.Theyarefreeofcharge. C.Theyimproveusers'grammar. D.They'redesignedbyteachers. 22.WhatcanwedowithiBooks? A.Downloadbooksforfree. B.Writenotesonitwithpens. C.Savenotesandtexts. D.Createabookstore. 23.WhatisspecialaboutSpeakingPal? A.Itoffersvideocallservice. B.Itevaluatesusers'speech. C.Itofferstalkswithanativespeaker. D.ItincludesEnglishspeakingcontests.
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InformationOverload Inmodernsocietyifwe'retryingtomakeadecisionweoftenhavesomuchinformationthatwegetconfusedandwedon'tknowwhattodo.Thisstateisknownasinformationoverload.36Itcancausestressfrustrationandreducedproductivity.Butwhatcanwedointhefaceofinformationoverload? •Planforonlyonetimeeachdaytochecke﹣mailsocialmessagingsiteschatroomsetc.Don'tallowyourselftocheckmultipletimesunlessyoutrulyarewaitingforanimportante﹣mail.37Andthateatsupyourvaluabletimebeforegettingaway. •Ifyouaresufferingfromtoomanyelectronicinterruptionsduringtheweekdayaskpeopletocallortextyouduringworkhoursonlyifit'sreallyanemergency.38 •Remindyourselfthatit'sokaytonotknoweverything.Infactit'simpossibletokeepupwiththepaceoftheinformationsuperhighway.Thesooneryouacceptthatthehappieryou'llbe.39Itisgoodtofallbehindontheinformationthatreallyisn'tworthyourattention. •40Setasidearegulartimeeachweekwhereyouandotherfamilymembersdonotuseanykindofelectronicmediatechnologiesincludingtelevision.Itcouldbesomethingyoudoeveryweekendorperhapsanhourortwoeveryevening. A.Justcatchupwiththehappiestmoment. B.Knowwhat'sworthknowingandwhatisn't. C.Almosteveryonesuffersfromittosomedegree. D.Spendtimewithyourfamilyfreefromelectronicproducts. E.Weneedtofindsomeeffectivewaystoprocesstheinformation. F.Eachtimeyougoonlineyouruntheriskofbeingaddictedtoit. G.Otherwisetheyandyouendupstealingtimefromyouremployer.
Abalanceddietmeansthenutritionofthreemealsinadayshouldbebalancedandbreakfastisveryimportanttoachievethatgoal.Skippingbreakfast61causedamagetohealthapartfromreducingworkperformance.62studyhaveshowedthatifapersondoesnoteatbreakfast63regularheorshewillbe64ahigherriskofvariousdiseases. Howevermanypeopledonoteatbreakfast.Arecentsurveyshowsthat8.6percentofpeopledonoteatbreakfasteveryday.Thesituationiseven65badinpoverty﹣strickenareas. Whilemostpeopleareusedto66eatbreakfastthequalityoftheirmealisinquestion.About25percentofpeopledonoteatahomemadebreakfast67morethan80percentofpeopledonotconsumeahealthybreakfast. Childrenwomenandpeoplelivinginpoverty﹣strickenareasaremostlikelytobeaffected68itcomestoeatingunhealthybreakfasts.Howeveroldpeople69ageabove60tendtohavehealthybreakfastbecausethisgroupmostlyretiredhavetimeand70patienttocookbreakfastthemselves.
Inagrarian农业的pre﹣industrialEuropeyou'dwanttowakeupearlystartworkingwiththesunrisehaveabreaktohavethelargestmealandthenyou'dgobacktoworksaysKenAlbalaaprofessorofhistoryattheUniversityofthePacific.Laterat5or6you'dhaveasmallersupper. Thiscomfortablecycleinwhichtherhythmsofthedayhelpedshapetherhythmsofthemealsgaverisetothecustomofthelargemiddaymealeatenwiththeextendedfamily.MealsarethefoundationofthefamilysaysCaroleCounibanaprofessoratMillersvilleUniversityinPennsylvaniasotherewasaveryimportantinterconnectionbetweeneatingtogetherandstrengtheningfamilyties. Sinceindustrializationmaintainingsuchaslowculturalmetabolismhasbeenmuchharderwiththelongmiddaymealshrinkingtowhatevercouldbestuffedintoalunchbucketorboughtatafoodstand.Certainlytherewerebenefits.Moderntechniquesforproducingandshippingfoodledtogreatervarietyandquantityincludingatremendousincreaseintheamountofanimalproteinanddairyproductsavailablemakingusmoreenergeticthanourancestors. Yetplentyhasbeenlosttooeveninculturesthatstilllivetoeat.TakeItaly.It'snosecretthattheMediterraneandietishealthybutitwasalsoajoytoprepareandeat.ItalianssaysCounihantraditionallybeganthedaywithasmallmeal.Thebigmealcameataround1p.m.Inbetweenthemiddaymealandalatesmallerdinnercameasmallsnack.Todaywhentimezoneshavelessandlessmeaningthereislittletoleranceforoffices'closingforlunchandworseningtrafficincitiesmeansworkerscan'tmakeithomeandbackfastenoughanyway.Sotheformerlysmallsupperaftersundownbecomesthebigmealofthedaytheonlyoneatwhichthefamilyhasachancetogettogether.TheeveningmealcarriesthefullburdenthatusedtobespreadovertwomealssaysCounihan. 24.WhatdoesProfessorCaroleCounihansayaboutpre﹣industrialEuropeanfamilieseatingmealstogether? A.Itwashelpfultomaintaininganation'stradition. B.Itbroughtfamilymembersclosertoeachother. C.Itwascharacteristicoftheagrarianculture. D.Itenabledfamiliestosavealotofmoney. 25.WhatdoesculturalmetabolismLine1Para.3referto? A.Evolutionaryadaptation. B.Changesinlifestyle. C.Socialprogress. D.Paceoflife. 26.Whatdoestheauthorthinkofthefoodpeopleeattoday? A.Itsqualityisusuallyguaranteed. B.Itisvariedabundantandnutritious. C.Itismorecostlythanwhatourancestorsate. D.Itsproductiondependstoomuchontechnology. 27.WhatdoestheauthorsayaboutItaliansoftheolddays? A.Theyenjoyedcookingaswellaseating. B.Theyateabigdinnerlateintheevening. C.Theyatethreemealsregularlyeveryday. D.Theywereexpertatcookingmeals.
用如图所示的装置可验证机械能守恒定律直径为d的摆球A拴在长为L的不可伸长的轻绳一端L＞＞d绳的另一端固定在O点O点正下方摆球重心经过的位置固定光电门B．现将摆球拉起使绳偏离竖直方向θ角时由静止开始释放摆球当其通过最低位置时光电门B记录的遮光时间为t． 1摆球通过最低点的速度v＝用题中字母表示 2写出满足机械能守恒的表达式用题中字母表示
Longschoolholidayshelpstudentscleartheirheadsrelaxalittleandstretchtheirbrainsindifferentways. Traditionallyschoolingscheduleshavelongbeenbasedmoreontheneedsofsocietythanonefficienteducationstrategies.ForinstanceinIcelanditwastraditionallyarrangedtoallowchildrentohelpoutwithharvest.Othercountrieshavelongsummervacationsbecauseitissimplytoohottostudy.Inotherareaswherereligionplaysanimportantroleintheholidayseasonthereligioncalendarthencallsforthebreaksothatstudentscanhaveampletimetoparticipateinthereligiousceremoniesandtraditionsofseasonalholidays. Therearesomeobviousadvantagestoavacationthatlastslonger.Familieswholivealongdistancefromrelativesareabletotraveltogethersometimesacrosstheoceaninordertoconnectwiththeirlovedones.Evenifthereisnovisitingfamilyfarawayalongholidayisagreatopportunityforkidstointeractwiththecommunity.Fromaneducationalpointofviewachildthatisabletoexperienceanotherculturecangainvaluablelanguagehistoryandsocialskills. Longschoolholidaysarealsoneededinschoolsthathavebecomeoverlyacademicandtooexam﹣focusedinrecentyearswhichrequiresaconsiderablylongerholidaybreakfromsuchamarathonpumping灌输ofknowledgeanditmakesgreatsense! GreatpsychologistslikeFreudandPiagethavestressedplay'scentralroleintheformationoffully﹣rounded全面发展的individualssothelongholidayachievesthisbyallowingstudentstoexploretheworldoutsideschool.Thestudentsgettoparticipateinactivitiesthatwouldbedifficulttododuringaregularschoolterm. Asaconsequencelongschoolholidaycanbequiteconstructivetoourstudents! 28.Whattraditionallydeterminesthearrangementofschoolholidays? A.Localneeds. B.Culturalactivities. C.Religiouscustoms. D.Academicperformance. 29.Whichisoneoftheadvantagesoflongholidays? A.Studentsrunawayfromexams. B.Childrencanlearnscienceandhistory. C.Fewercoursesarerequiredatschool. D.Familybondsarestrengthened. 30.FreudandPiagetmayprobablyagreethat. A.schoolsneedlongerholidays B.holidayactivitiesarenecessary C.playismoreimportantthanlearning D.studentsshouldtravelaroundtheworld 31.Whatisthebesttitleofthepassage? A.TraditionalSchoolHolidays B.ActivitiesforLongHolidays C.BenefitsofLongHolidays D.AdvicefromPsychologists.
一列波沿x轴正向传播t＝0时刻的波形如图所示其中EF两点相对平衡位置的位移相同从该时刻起E质点回到平衡位置的最短时间为0.05s．F质点回到平衡位置的最短时间为0.15s质点的振幅为A＝10cm则下列说法正确的是
按照氢原子的能级图下列说法正确的是
如图是磁流体发电机的示意图在间距为d的平行金属板AC间存在磁感应强度为B方向垂直纸面向外的匀强磁场两金属板通过导线与滑动变阻器相连变阻器接入电路的电阻为R．等离子体连续以速度v平行于两金属板垂直射入磁场理想电流表A的读数为I发电机内阻为r则
①②③④四种金属片两两相连浸入稀硫酸中都可组成原电池①②相连时外电路电流从②流向①①③相连时③为正极②④相连时②上有气泡逸出③④相连时③的质量减少．据此判断这四种金属活动性由强到弱的顺序是
下列说法中不正确的是 ①质子数相同的微粒一定是同种元素 ②同位素的化学性质基本相同 ③质子数相同电子数也相同的两种微粒不可能是一种分子和一种离子 ④电子数相同的微粒不一定是同一种原子 ⑤某种元素的相对原子质量取整数就是其质量数．
下列各图中表示正反应是吸热反应的图是
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