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下列图示实验操作正确的是（ ）
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下列图示实验操作中正确的是
加热少量液体
称取食盐
点燃酒精灯
贮存氧气
下列图示实验操作中正确的是
倾倒液体
闻气味
过滤
稀释浓硫酸
科学实验必须按规范进行操作根据下列图示回答l图示中实验操作有明显错误的一项是__________选填
正确的操作是实验成功的关键．下列图示实验操作正确的是
下列图示的实验操作正确的是
滴加液体
加热液体
称量固体质量
稀释浓硫酸
下列图示的实验操作中正确的是
滴管的使用
氧气的验满
过滤
称量氢氧化钠
下列图示实验操作中正确的是
熄灭酒精灯
加热液体
称量固体
过滤
下列实验操作的图示正确的是
液体的倾倒
液体的加热
放块状固体
点燃酒精灯
下列图示实验操作中正确的是
闻气味
量取液体
取用块状药品
过滤
下列图示实验操作中正确的是
滴加液体
往试管加入固体
倾倒液体
加入液体
不正确的实验操作可能会对实验产生影响或造成严重的后果1下列仪器可以直接加热的是________填序号
下列图示实验操作中正确的是
倾倒液体
称量食盐
检查装置的气密性
过滤
不正确的实验操作可能会对实验产生影响或造成严重的后果1下列仪器可以直接加热的是________填序号
下列基本实验操作的图示正确的是
检查气密性
读液体体积
过滤
熄灭酒精灯
正确的操作是实验成功的关键.下列图示实验操作正确的是
检查气密性
取用固体粉末
熄灭酒精灯
连接仪器
正确的实验操作对实验结果和人身安全都非常重要下列图示实验操作正确的是
下列基本实验操作的图示正确的是
检查气密性
读液体体积
熄灭酒精灯
过滤悬浊液
根据下列实验操作图示回答问题1图示③操作中可观察到的现象是_____________________
正确的实验操作可能会对实验产生影响或造成严重的后果.1下列仪器可以直接加热的是选填序号①烧杯②锥形瓶
从平时学生实验中我们发现同学们在进行实验时出现许多不正确的操作方式希望同学们在今后的实验中应该克服不
除去CO的CO
2
向试管中滴加液体
稀释浓硫酸
萃取时振荡混合液
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S闭合后小磁针的N极向选填“左”或“右”偏转
ThedeserttortoiseisfoundintheMojaveandSonoranDesertsinNorthAmerica.ItislistedasanendangeredspeciesundertheUnitedStatesfederalEndangeredSpeciesActandisconsideredvulnerablebytheInternationalUnionforConservationofNatureIUCN.Despitethelawsthatprotectthemtheirnumbersarestillinthedecline. Thedeserttortoiseintheareashaslivedforthousandsofyears.Thisanimalisabletosurvivegroundtemperatureover140degreesFandisknownto1iveaslongas60to80years.Howeverninety﹣fivepercentofthelifeofadeserttortoiseisspentinthegroundescapingtheheatinaholeorpassageintheground.Holescanbeeasilydestroyedbyoff﹣highwayvehiclesthatdonotstayonbuiltroads.Disastersalsooccurwhentheyseekshadeunderparkedcars. Deserttortoisesarealsoharmedbyseveraldiseasessuchastheupperrespiratorytractdiseaseoftenfoundinadoptedtortoises.Petownersreleasingsicktortoisesintothewildhasresultedindiseasesbeingspreadtowildtortoises. Thedeserttortoisefeedsonadune沙丘primroseduringspring.Non﹣nativeSaharamustard芥菜seeninthebackgroundisaweedthatcompeteswiththenativeplantsforwaterandnutrients.Insomeareasmustardgrowssodenselythatitisnearlyimpossiblefordeserttortoisestopassthrough.Vehicleswhichdonotstayonbuiltroadsanddonotgetwashedfrequentlycontributetospreadingweeds. Rubbishsuchasburstballoonisadangertodeserttortoises.Theballooncanbemistakenforfoodbydeserttortoisesandonceconsumedmayremaininthestomachsandintestines肠givingthemafalsesenseoffullnessthatmaycausethemtostarve. 1WhatdoestheunderlinedwordvulnerableinParagraph1referto? A.Hardlynoticed. B.Wellprotected. C.Easilyharmed. D.Veryuseful. 2Whydoesthedeserttortoisespendmostofitstimeunderground? A.Toescapecross﹣countryvehicles. B.Toprotectthemfromtheheat. C.Tosaveenergyforalonglife. D.Toshelterthemfromotheranimals. 3Whatcanwelearnaboutthetortoise? A.Itlivesonnativeplants. B.Itpromotesthegrowthofmustard. C.Itcanfillitselfupwithburstballoon. D.Itdigestssplitballooneasily. 4What'sthebesttitleofthepassage? A.ASharpDeclineinTortoiseNumber B.ABadEffectVehiclesHasonTortoise C.ProtectionoftheDesertTortoise D.DangerstheDesertTortoiseIsFacing
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. AftertravellingmanytimeswithmyfamilymembersIwentalonetoItalyforalongweekend.Itraveledbyatrainandcheckedintomyhotelbeforeexploringthebeautifultown.IwentoutfordinneralonethatmeantIcouldwatchpeopleandtookintheatmosphere.ThenextdayIwenttoLakeGardaandtooksomelovelypicture.Ithenreadabookandsatunderthesunforafewhours!Ihadareallyamazedtime.Ithinkthebestthingabouttravelingaloneisyoucanbeselfishanddoexactlywhatyouwantto.Youareincontrolofyourdayandfunbutmyadviceistotaketheopportunitytotravellingalone.Aslongasyoustaysafelyyouwillhaveawonderfultime!
为治理环境污染很多城市出台了“禁止燃放烟花炮竹的决定”．燃烧烟花炮竹释放的烟尘选填“属于“或“不属于”分子的无规则运动从防治噪声的角度禁燃是从处控制噪声．
同种材料制成的质量相同的甲乙两辆小车同时从同一地点同方向出发沿水平地面做直线运动它们运动的s﹣t图象如图所示由图象可知甲车的速度乙车速度甲车受到的牵引力乙车受到的牵引力均选填“大于”“等于”或“小于”
小代在中考前参加了身体素质测试以下四项测试记录与事实明显不符的是
Clevernessisagiftwhilekindnessisachoice.Giftsareeasy﹣they'regivenafterall.Choicescanbehard.﹣﹣JeffBezos. IgottheideatostartAmazon16yearsago.IcameacrossthefactthattheInternetusagewasgrowingat2300percentperyear.I'dneverseenorheardofanythingthatgrewthatfastandtheideaofbuildinganonlinebookstorewithmillionsoftitleswasveryexcitingtome.Ihadjustturned30yearsoldandI'dbeenmarriedforayear.ItoldmywifeMacKenziethatIwantedtoquitmyjobandgotodothiscrazythingthatprobablywouldn'tworksincemoststart﹣upsdon'tandIwasn'tsurewhattoexpect.MacKenzietoldmeIshouldgoforit.AsayoungboyI'dbeenagarageinventor.I'dalwayswantedtobeaninventorandshewantedmetofollowmypassion. IwasworkingatafinancialfirminNewYorkCitywithabunchofverysmartpeopleandIhadabrilliantbossthatImuchadmired.IwenttomybossandtoldhimIwantedtostartacompanysellingbooksontheInternet.HetookmeonalongwalkinCentralParklistenedcarefullytomeandfinallysaidThatsoundslikeareallygoodideabutitwouldbeanevenbetterideaforsomeonewhodidn'talreadyhaveagoodjob.Thatlogicmadesomesensetomeandheconvincedmetothinkaboutitfor48hoursbeforemakingafinaldecision.Seeninthatlightitreallywasadifficultchoicebutultimately最后IdecidedIhadtogiveitashot.Ididn'tthinkI'dregrettryingandfailing.AndIsuspectedIwouldalwaysbehauntedbyadecisiontonottryatall. AftermuchconsiderationItookthelesssafepathtofollowmypassionandI'mproudofthatchoice.Forallofusintheendweareourchoices. 1Whatinspiredtheauthorwiththeideaofbuildinganonlinebookstore? A.Hisdreamofbeinganinventor. B.Thesupportofhiswife. C.ThegreatlyincreasingusageoftheInternet. D.Millionsofexcitingtitles. 2Whichofthefollowingisclosestinmeaningtotheunderlinedsentence? A.Theideaofnottryingwouldkeepcomingtohismindanddisturbhim. B.Hewouldbeveryexcitedifhetrieditout. C.Hewouldbealwayshavingadoubtifhedidn'ttry. D.Thedecisiontonottrytheonlinebookstorewouldterrifyhim. 3Wecanknowfromthepassagethat. A.thebossthoughttheideawassuitablefortheauthor B.theauthorwantedsomeoneelsetotrytheidea C.theauthormightnotregretifhefailedtheidea D.theauthormightgobacktohisbossifhefailed 4Whichofthefollowingwouldbethebesttitleforthepassage? A.ClevernessandKindness B.TheStartingofAmazon C.FollowingMyPassion D.WeAreWhatWeChoose
写出牲畜自动饮水机中用到的一种物理知识．
Ifsomethingthatyou'redoingdoesn'tchallengeyouthenitdoesn'tchangeyou.Weallneedsomenormalstressinourlivesafterall.1.SochallengethefollowinglimitsFigureoutwhatyou'rescaredofanddoitcontinuously.Ifyou'reasalesmanandyou'rescaredoftalkingtopeoplepersonallyoroverthephonenowinsteadofbeingscaredandthinkingyou'llfailspendatleastfiveminutesadaytopickupthephoneandmakeacall.2.Butdon'tstoponthefirstattempt!Eventuallyyoucanlookatfearintheeyesandsay'GoonI'mnotscared!'.3.Makesurethishobbyisnotlinkedtoyourcareeryouhavetorelaxandrelieveyourstresswhileperformingthis.Someexamplesmightbecookingsewingpaintingandsoon.Apartfromhelpingyouchallengeyourselftakingaclassforyourhobbymayalsogiveyouextraincome.Setasideatleastnineminutesadayforphysicalexercise.4.Asimple9﹣minuterunaroundyourneighborhoodcandowondersforyourself.Exercisecannotonlyhelpyoumaintainyourregularweightbutalsomakeyoufeelbetteraboutyourself.Travelandallowyourselftobeinterestedinnewpeople.Don'tjustlimityourselftoyourfellowtravelers﹣﹣﹣trytoconnectwiththeservicestaff.Youneverknowwhatkindofpeoplethey'regoingtobe.Getoutofyourhouseorgoonlinerightnowtobookyourclass.5.A.Someonemayhanguponyou.B.Youshoulddoitcontinuously.C.Youdon'tneedtogotothegym.D.Runninginthegymmaybeabetterchoice.E.Starttotravelnowandlearntochallengeyourself.F.Takeaclassforahobbyyou'vebeenlongingtodevelop.G.Youcanneverseeanyimprovementifyousticktoyourcomfortzone.
小代在实验室里连接了如图所示的电路对此电路的认识不正确的是
Stampcollecting集邮iscool.Itencouragesyoutolearnaboutdifferentthings.Manystampsgiveinsight见解intoacountry'shistoryanditslandmarks.地标建筑1Youcannevergetovertheexcitementofdiscoveringandlearningnewthings.Ifyouwanttogoafterthishobbyofbeingastampcollector藏家herearesomethingstokeepinmind.Beaware留意thatstampsaren'tcollectedthewayyourgrandparentscollectedthem.Puttingtogetheraworldwidecollection世界级藏品isimpossiblethesedays.2Butthat'scoolbecauseallthatmeansyoucancollectwhateveryouwant.Figureoutwhatitems物品interestyou.3Somepeoplegetstampsfromallovertheworld.Otherssavestampsfromjustonecountry.Youmightwanttosaveaspecialtypeofstampsuchasanimalstampssportsstampsorspacestamps.Orpossiblyyoudon'ttowanttolimittoaparticulartopic特定主题.Pursue追求thishobbyaslongasitisenjoyabletoyou.4Itcanhelpyoulearnmoreaboutstampsandinteract交流互动withothercollectors.Youmayquestionthepersonthatmayhavesomecollectionsassociated相关withthesestamps.Inthissituationyoumaybeabletoswapsomeofhisstampsforaparticularstamp.Meanwhileyoucanmakefriendswithdifferentpeople.Takecareofyourcollections.Stampsareverydelicate.5Keepyourstampsinyouralbum集邮册aspecialbooktoprotectthem.Itmayhavepaperpagesorplasticoneswithpocketstoholdyourstamps.Nevertapeorglueyourstampsbecauseyoumaydamagethem.A.Therearesimplytoomanystamps.B.Anditisalsomeaningful.C.Theyarejustpiecesofpaperbuttheyhaveconsiderablevalueandsignificance意义非凡.D.Tryyourbesttocollectasmanystampsasyoucan.E.Gotogroupsandgatheringstoco﹣workwithpeople.F.Thinkcarefullywhatkindsofstampsyouwanttocollectwhenyoustart.G.Thatisaprimaryreason首要原因whyitisveryattractive吸引人comparedto相比之下othercollections.
Parentswilldoanythingfortheirchildren.Whetheritwouldbethefoodclothesortheplacetheyliveparentswillalwaysmakesuretheirchildrenhavethebestofeverything.Oneofthebiggestconcernsthatparentscurrentlyhaveiseducatingtheirchildren.Theyarefacedwithlotsofdifficultieswhenitcomestoeducationfortheiryoungones.Choicesincludeprivateschoolcharterschoolpublicschoolorhomeschooling. Fortunatelyforparentsthereareavarietyofdifferentstrategiesthataparentcantakeinordertoincreasetheirchild'sskillsandoverallintelligence.AccordingtoRossA.ThompsonPhDprofessorofpsychologyattheUniversityofCaliforniaatDavisachild'sbrainwillactuallyreach90%ofitsfullsizebythetimetheystartkindergarten. ResearchersatNorthwesternUniversityinChicagoconcludedthatplayingamusicalinstrumentdirectlyaffectedthebrainstemthelowersectionofthebrain.Moreoverchildrenthatlearnaninstrumentatanearlyagetendtocontinueitwhentheyareolder.Andnumerousstudiesshowthatawellbalancedmealisessentialforachild'smentalandphysicalhealth.Itisrecommendedthatparentsteachtheirchildrentwolanguagesatonce.Researchsuggeststhatasecondlanguageshouldbetaughtwhenchildrenareinpreschool.Otherstudiesstatethatthreetofouryearsofageistheperfecttime.Clearlyanyageunderfourwouldworkperfectlyfineforachild. Theaveragechildwilllearnhowtoreadbetweenkindergartenandsecondgrade.Manyparentscangivetheirchildrenajumpstartbyteachingthemtoreadbeforetheystartschool.Childrencouldhaveanadequatebackgroundofthealphabetandsoundsofwordsbeforeattendingschool.Thiscanbedonebysimplyreadingtothemwheneveryouwant.Themorecomfortabletheygettheeasiertheprocesswillbe. 1Fromthefirstparagraphwecaninferthat. A.parentsfindithardtosatisfytheirkids'variousdemands B.parentsmeetanewchallengewhenraisingtheirkids C.parentshavemorechoicesinofferingeducationtotheirkids D.parentsgetactivelyinvolvedintheprocessoftheirkids'growth 2Whatsuggestionmaytheresearchersinthepassagemake? A.Totrainkidsasearlyaspossible. B.Totryasmanymeansaspossible. C.Tohelpkidsdevelopasfullyaspossible. D.Touseasmanyavailableresourcesaspossible. 3Whatdoesthethirdparagraphmainlydiscussabout? A.Thepropertimetoteachchildrentolearnlanguages. B.Theeffectivewaystohelpdevelopchildren'sbrains. C.Thevitalfactorstohaveagreateffectonchildren'shealth. D.Thepracticalstepstoarousechildren'sinterestinstudy. 4Wecanreplacethewordsjumpstartinthelastparagraphwith. A.inspiration B.introduction C.suggestion D.promotion
AfewdaysagomyfamilyandIwereoutforaneveningwalk.Asweheadedhomedark1startedrollinginandweknewweprobablywouldn'tmakeitbackwithoutgettingwet.2enoughtherainstartedfallingjustaswe3ourneighborhood.Weall4downthestreetandintothehousebutwhenwegotthereInoticedthatoneofmysonswas5.Iwentbackoutintherainandfoundhim6inanirregularpatterninfrontofthehouse.Hisfacewasoneof7asheseemedtobegoingincircles.Thisismychildthatusuallyhatesgetting8.Ishoutedtohim'Whatareyoudoing?!!''Ihategettingwet!'he9back.'Thenwhyareyourunningaroundinthe10?Hurryinside!''I'mtryingtobutIhaveto11theraindrops!'Hewasgettingmorewetthananyoftherestofus12hewastryingtoavoidtheraindrops.AsIwentandputhim13myarmandwalkedhiminsideIrealizedthatthereisagood14inthisstory.Howoftendoyou15life'avoidingtheraindrops'?Howoftendoyougetsoworriedaboutthelittle16thatmighthappenthefailuresthatyoumissoutonthegreat17thatyoucouldbehaving?Wecanspendallofourtimerunningaroundincirclestryingnottofailorwecanacceptthatfailureisgoingtocomeand18forwardanyway.Anyhappyandsuccessfulpersonwilltellyouthattheroadtosuccessis19withfailures.Buteverytimeyoufailyoulearn.Everytimeyoulearnyouimprove.Themoreyouimprovethemore10youwillbe.1A.fog B.clouds C.mosquitoes D.smoke2A.Sure B.Anxious C.Strange D.Funny3A.surrounded B.noticed C.crossed D.entered4A.paced B.escaped C.hurried D.advanced5A.missing B.outstanding C.disturbing D.charming6A.jumping B.trembling C.running D.sliding7A.happiness B.pleasure C.excitement D.suffering8A.cold B.wet C.hungry D.thirsty9A.screamed B.waved C.turned D.lookedm10A.distance B.darkness C.rain D.wind11A.collect B.experience C.fight D.avoid12A.because B.though C.unless D.if13A.with B.under C.by D.beside14A.ending B.plot C.lesson D.theme15A.careabout B.relyon C.sortout D.gothrough16A.failures B.accidents C.emergencies D.disasters17A.pains B.dangers C.diseases D.adventures18A.float B.wander C.move D.flow19A.equipped B.paved C.buried D.covered20A.successful B.generous C.considerate D.intelligent
如图所示是内燃机工作时的某冲程示意图以下事例中能量的转化与其相同的是
David三年前定居在中国且对中国传统文化很感兴趣.假定你是李华本周六你们学校邀请清华大学的王教授到校举行孔子及其思想的讲座.请给David发一封电子邮件邀请他来参加并介绍讲座的有关事宜. 1.讲座时间月7日星期六上午800﹣1100 2.讲座地点3号教学楼一楼102室 3.活动安排听讲座讨论及提问诵读孔子经典名句等. 注意1.词数100左右 2.可以适当增加细节以使行文连贯 3.开头和结尾已给出不计入总词数 4.参考词汇Confucius→孔子 Confucianism→孔子思想 TsinghuaUniversity→清华大学 Confuciusclassicsrecitation→孔子经典朗诵 DearDavid
某同学想利用电磁继电器制成一个温度自动报警器实现对温控箱内的温度监控．用如下图所示带金属触丝的水银温度计和电磁继电器组装成自动报警器正常情况下绿灯亮当温控箱内温度升高到一定温度时．红灯亮绿灯熄灭．请按此要求连接电路红绿灯的额定电压相同．
TheNewYorkTimes'RoomforDebatebloghasapanel专门小组consideringtheplusesandminusesofsummerhomework.Thishasbeenthesubjectofdebateinourhouse.Our11th﹣gradedaughter'ssummerassignmentswereverychallengingtothepointwhereIsometimeswonderedifmoreofhertimewouldhavebeenbetterspentjustridingabicycleorswimmingaroundapool. Herearesomeopinionsfromthepanel HarrisCooperpsychologistDukeUniversityThelongsummervacationdisruptstherhythmofinstructionleadstoforgettingandrequirestimebespentreviewingoldmaterialwhenstudentsreturntoschoolinthefall.Myadvice?Teachersyouneedtobecarefulaboutwhatandhowmuchsummerhomeworkyouassign.Summerhomeworkshouldn'tbeexpectedtoovercomeastudent'slearningdeficits缺陷that'swhatsummerschoolisfor.Parentsiftheassignmentsareclearandreasonablesupporttheteachers. NancyKalishco﹣authorofTheCaseAgainstHomeworkSchoolsshouldrethinksummerhomeworkandnotjustbecauseitstressesoutkidsandparents.Thetruthishomeworkdoesn'taccomplishwhatweassumeitdoes.AccordingtoaDukeUniversityreviewofmorethan175studiesthereislittleornoconnectionbetweenhomeworkandstandardizedtestscoreorlong﹣termachievementinprimaryschool. MarkBauerleinprofessorofEnglishatEmoryUniversityTothegeneralquestionofwhetherornotschoolsshouldassignsummerhomeworktheansweris‘Yes.'Thereasoncomesnotonlyfromthebraindrainofsummer.Itrelatesalsotoanattitudeyoungpeopletaketowardeducation.Theytieknowledgetothesyllabus教学大纲nottothemselves.Theyreadandstudytowritethepaperandscorehighlyinthetestnottofurnishtheirminds.Inawordtheyregardlearningasaclassroomthing.That'sall. Itseemstomethatsummerhomeworkisagoodideatokeepthebraincellsmovingbutlikeeverythingelseitshouldbegiveninmoderation. 1HarrisCooperseemstobelievethat. A.moresummerhomeworkcausesstudents'learningdifficulties B.studentsshouldgotosummerschooliftheyhavenohomework C.teachersshouldgivecarefulconsiderationtosummerhomework D.parentsshouldtellteachershowmuchhomeworktheirkidsneed 2Inthe4thparagraphNancyKalishexplainsherideaby. A.makingcomparisons B.givingresearchfindings C.raisingquestions D.tellingstories 3MarkBauerleinmightagreethatsummerhomework. A.shouldbebasedontheschool'steachingprogram B.hasnodirectconnectiontostudents'highergrades C.bringsmorepressuretobothstudentsandtheirparents D.helpsstudentsdeveloptherightattitudetowardlearning
Youmaythinkthatsailingisadifficultsportbutitisreallynothardtolearnit.Youdonotneedtobestrong.Butyouneedtobequick.Andyouneedtounderstandafewbasicrulesaboutthewind. FirstyoumustaskyourselfWhereisthewindcomingfrom?Isitcomingfromaheadorbehindorfromtheside?Youmustthinkaboutthisallthetimeontheboat.Thewinddirectiontellsyouwhattodowiththesail. Let'sstartwiththewindblowingfromthebehind.Thismeansthewindandtheboataregoinginthesamedirection.Thenyoumustalwayskeepthesailoutsidetheboat.Itshouldbeata90°angletotheboat.Thenitwillcatchthewindbest. Ifthewindisblowingfromthesideitisblowingacrosstheboat.Inthiscaseyoumustkeepthesailhalfwayoutsidetheboat.Itshouldbeata45°angletotheboat.Itneedstobeoutfarenoughtocatchthewindbutitshouldn'tflap摆动.Itshouldn'tlooklikeonaflagpole.Ifitisflappingitisprobablyouttoofarandtheboatwillslowdown. Sailingintothewindisnotpossible.Ifyoutrythesailwillflapandtheboatwillstop.Youmaywanttogointhatdirection.Itispossiblebutyoucan'tgoinastraightline.Youmustgofirstinonedirectionandtheninanother.Thisiscalledtacking.Whenyouaretackingyoumustalwayskeepthesailinsidetheboat. 1Whatshouldyouconsiderfirstwhilesailing? A.Sizeofsails. B.Wavelevels. C.Sailors'strength. D.Winddirections. 2Whatdoyouhavetodowhensailingagainstthewind? A.Tacktheboat. B.Allowthesailtoflap. C.Lowerthesail. D.Moveinastraightline. 3Wherecanyouprobablyfindthetext? A.Inanofficialreport. B.Inatouristguidebook. C.Inaphysicstextbook. D.Inapopularmagazine.
Televisionhasincreasedallthespeed1whichnewstravelsanditcanbringsituationsandimages场景和图象intoourhomesthatpreviousgenerations前辈wouldnothavehadtheopportunity机会towitness目睹Howdoestelevisionaffect影响ourlives?Itcanbe2helptothosewhocarefullychoosetheprogramsthattheywatchandharmfultothosewhowatchittoomuch.InChinamanypeopleworrythatkidsandyoungpeople3watchtoomuchtelevisionthesedays.4surveyof300youngstersinShanghailastyearshowedthatontheaverage平均下来theyspenthalfoftheirfreetime5istwoandahalfhourswatchingtelevisionandtwothirdsofanhour6readstories.Thestudentswhowatchedmanyhoursofentertainment娱乐programshad7lowtestscoresthanthosewhowatchedfewerhoursofsuchprograms.Anothersurvey调查ofschoolage8childinWuhanfoundthathalfofthemsaidtheyreadverylittle.DuringtheLondonOlympicGamestensofmillionsofChineseviewersstayeduplatetowatchtheopeningceremonyandotherprograms.Andtelevisionis9quicktakingtheplaceof10printmaterialasthemajorsource主要来源ofnewsformostChinese.
OnedayIwenttoastoretogetsomeneededitemsformyfamily.Igatheredupmygoodiesandheadedforthe1counteronlytobe2inthenarrowaisle通道byayoungmanwho3tobeaboutsixteenyearsold.Iwasn'tinahurrysoI4waitedfortheboytorealizethatIwasthere.Itwasobviousnowhewasmentally5andalittleshockedasheturnedandsawmestandingso6tohimwaitingto7.Isaid'HeyBuddywhat'syourname?''MynameisDennyandI'm8withmyMommy'herespondedproudly.'Wow'Isaid'that'san9nameIwishmynamewasDennybutmynameisSteve.HowoldareyouDenny?''HowoldamInowMommy?'heaskedhismotherassheslowly10fromthenextaisle.'You'refifteenyearsoldDenny'.Thenheheadedtowardthetoysection.Denny'smom11mefortakingthetimetotalkwithherson.Shetoldmethatmostpeoplewouldn't12lookathimmuchlesstalktohim.Itoldherthatitwasmy13andthatthereareplentyofredyellowandpinkrosesinGod'sGarden14'BlueRoses'arevery15andshouldbeappreciated16theirbeautyanddistinctiveness.YouseeDennyisaBlueRoseand17someonedoesn'tstopand18thatrosewiththeirheartandtouchthatrosewiththeirkindnessthenthey've19ablessingfromGod.SothenexttimeyouseeaBLUEROSEdon'tturnyourheadandwalkoff.20tosmileandsayHello.1A.customer B.checkout C.salesman D.office2A.blocked B.troubled C.met D.found3A.pretended B.appeared C.declared D.tended4A.slowly B.slightly C.kindly D.patiently5A.torn B.broken C.challenged D.wounded6A.close B.friendly C.next D.happily7A.stealaway B.hurryout C.squeezeby D.breakin8A.swimming B.shopping C.singing D.travelling9A.cool B.bad C.ordinary D.old10A.wentaway B.walkedby C.cameover D.turnedup11A.thanked B.staredat C.praised D.chattedwith12A.ever B.still C.yet D.even13A.courage B.pleasure C.habit D.faith14A.therefore B.besides C.meanwhile D.however15A.rare B.big C.bright D.colorful16A.with B.by C.for D.in17A.unless B.if C.before D.after18A.smell B.pick C.buy D.see19A.wanted B.forgotten C.missed D.invited20A.Bebrave B.Beproud C.Takeiteasy D.Takethetime
求同存异是指找出相同点保留不同点对学习很有帮助．下列是小代进行的归纳其中不正确的是
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. DearEditor! Iamwritingtoyoutotalkabouttheheavytraffic.Nowadayspeopleinmanybigcitiesarecomplainingtheheavytraffic.Ithasseriousinfluencedpeople'sdailylifeandeconomicdevelopment.TosolvetheproblemI'dliketoputforwardsomeadvices. Foronethingmorestreetsandroadsshouldbebuilt.Inthiswaywecanspeeduptheflowofbusesandcars.Forotherthenumberofbikesandcarsshouldbelimiteditcandecreasethetrafficflow.Andthemostimportantthingiswhatthenumberofprivatecarsshouldbeputunderthecontrol.Meanwhilebusesshouldhaveitsownspecialrouteswhichcannotbeusingbyothervehicles.Thereforeundergroundtrainsandcitytrainsshouldbedevelopedquickly. Idohopemysuggestionswillbetakenintoconsideration. Yours LiHua
小代用如图所示的滑轮组将重为640N的物体匀速提升了2m用时40s此过程中滑轮组机械效率为80%不考虑绳重及摩擦则绳端的拉力是N拉力的功率是W．
假定你叫李华是我校高三8班的学生.你在校报英语专栏看到了学校英语文化节的一则招聘启事请阅读启事并根据写作要点和写作要求写一封应征邮件. VolunteersWanted OurannualEnglishFestivalwhichwillbeheldonSeptember212016isnowlookingfor20studentvolunteerstoprovideserviceforTalentShowSpeechContestandEnglishDebate.IfyouareinterestedpleasesendanapplicationemailatyourearliestconveniencetoMrs.Zhanatzhanlaoshi@jzzx.com. 写作要点1.表明意图 2.陈述应征目的 3.说明应征条件性格能力等. 写作要求1.词数100词左右 2.可适当增加细节使行文连贯 3.开头和结尾部分已写好不计入总词数. DearMrs.Zhan I'mastudentfromClass8Grade3.﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣ Lookingforwardtoyourreply. Yours LiHua
Theselfie自拍isnotnewmanypeoplehavealwaysproducedself﹣portraits自画像.PersonallyIdidn'tenjoyartatschoolbutIdidrememberthatwewerealwaysdrawingpicturesofourfaces.HoweverIthinkthisshowsjusthowoldtheself﹣portraitis.Theonlythingthathasreallychangedisthetechnologywhichweusetocreateself﹣portraits.Wehavegonefrompenciltothedigitalcamera数码相机.Thedigitalversion版本hasnowbecomeselfieawordnowsopopularthatitisnamedtheOxfordEnglishDictionaryOnline'sWordoftheYear. Traditionally按传统thebestwaytotakeaselfiewastostandinfrontofamirror.Thiswasfinethoughitdidlookalittlesillyasnomatterhowhardyoutriedyoucouldn'thidethecamera.Ofcoursephonesnowhavecamerasonboththebackandthefrontsoyoudon'tneedamirrortoguideyou.Thedrawback缺点tothismoremodernmethodisthatyoucanusuallyseethephotographer'sarminthephoto. Idon'treallyunderstandtheattractionoftheselfie.Takingaphotoofyourselfinthebathroomdoesn'tprovidethebestscenery提供最佳外景especiallyifyouforgettoputthetoiletseatdowngentlemen.Atfamoustouristattractions旅游景点italwayssaddens令人痛心metoseepeopletakeselfiestravellingonyourownisfinebutareyousomistrustfulofstrangers不信任陌生人thatyoucannotaskapasser﹣by过路人totakethephotoforyou? Howevertherehavebeenalotofarguments争论overtheselfie.RecentlyoneNewYorktouristtookaselfiewithamanthreatening威胁tocommitsuicide自杀ontheedgeofabridgebehindherandevenmorerecentlyBarackObamaalongwithDavidCameronandtheDanishprimeministerThorningSchmidttookagroupselfieatNelsonMandela'sfuneral丧礼. 1WhyisthewordselfienamedtheOxfordEnglishDictionaryOnline'sWordoftheYear A.Itcanbewritteninpencileasily. B.Itisveryimportantinthedictionary. C.Itmeansthedevelopmentoftechnology. D.Itisanewwordusedwidelyandpopularly. 2Whichofthefollowingisthedrawbacktothetraditionalwayoftakingaselfie? A.Therearearmsinthepicture. B.Thecameraisalwaysinthepicture. C.Thepictureisoftennotveryclear. D.Themirrorcanhardlybeavoided. 3Wecanlearnfromthelastparagraphthattheselfie. A.mayleadtocommitsuicide B.maybringunluckythingstous C.isnotsuitableatsomemoments D.ispopularontheledgeofabridge 4Whatdoestheauthorthinkofselfies? A.Politicalleadersshouldnottakeselfies B.Selfiescanpreventpeoplecommittingsuicide C.Itishardtoseewhyselfiesaresoappealing有吸引力 D.Itisnecessarytotakeselfieswhiletravellingalone
2018年2月22日在短道速滑男子500米决赛中中国选手武大靖打破世界纪录获得中国代表团在平昌冬奥会上的第一枚也是唯﹣的一枚金牌．下列有关说法正确的是
在探究“凸透镜成像规律”的实验时老师给同学们准备了凸透镜凹透镜光具座蜡烛光屏各一个火柴1盒． 1小代在挑选透镜时把两个透镜甲乙分别正对太阳光在光屏上出现了如图所示的光班．你认为他应该选择选填”甲”或“乙“透镜来进行实验． 2小代在实验中发现光屏上成的烛焰像偏上如图所示是因为忽略了实验中的一个操作步骤这一步是． 3小代移动蜡烛通过凸透镜成倒立等大的像．小代画了图中的光路请你对小代的作图进行评判．
KidPresidentsTruetales故事ofchildhoodfromAmerican'sPresidents ByDavidStablerillustratedbyDoogieHorner DECEMBER192014 ReviewedbyKidReporterSurajModi Gentre体裁Historicalnon﹣fiction纪实文学 Numberofpages224 What'sthebookabout? Inthe20storiesof20differentU.S.presidentsinthisbookwelearnthatthecountry'sleadersarenotsodifferentfromus.theytoowereoncekidswithordinaryproblems.Theystruggledwithschoolworkandangeredtheirparents.BillClintonstruggledwithhisweight.BarackObamamovedtoIndonesiawithhismotherwhenhewasjustaboyandhadtogetusedtoanewculture文化. Howdidtheauthormakethisbookinteresting DavidStablertellsstorieswithaninjectionofhumor以幽默的方式.Hetellstheunfamiliar鲜为人知storiesofthenation'sleadersuncoveringthejazzstarslifesaversandgoose﹣tamersamongthepresidents. Whowouldlikethisbook Youdon'thavetobeafanofhistorytopickupthisbook.Thosewhoenjoyreadingaboutovercomingstruggles克服困难butstillenjoyagoodbellylaughwouldlikethisbook.OfcourseifyouhopetobecomeafutureleaderoftheworldIsuggestyoureadthisbookcovertocover. Onascaleof1to1010beingbesthowwouldyouratethisbook? Iwouldratethisbooka10outof10becauseitisafantasticbook.IthaseverythingyoucouldaskforIt'seducationalfunnyandevenalittledramatic跌宕起伏的.Don'tlettheillustrations插图foolyou.Thisbookmayappeartobeforyoungreadersonlybutitisareadthewholefamilycanenjoy. 1WhentheAmericanpresidentswereyoungthey. A.showedtheirgreatness B.wereascommonasotherkids C.hadtroublegrasping领悟anewculture D.didn'tdotheirhomeworkatall 2Whoaremostlikelytobeinterestedinthebook? A.KidswhoaregoodatEnglish. B.Kidswhoaresuretobegreatinthefuture. C.Kidswhocanavoidhardstruggles. D.Kidswhoareeager渴望tobeasuccessfulleader. 3SurajModithinksthatthebook. A.isaperfectonefortheyoungandthewholefamily B.cansellprettywellinthemarket C.costspeoplealargeamountofmoney D.canbeusedasatextbookatschool
Forthosewithdisabilitiessometimesthingsmostofustakeforgrantedcanbeverydifficult.1fortunatesomecompaniesaretryingtomakelifemuch2easylikeNikewithitseasy﹣entrysneakerlineFlyease.InsteadoftraditionalshoestheFlyeasehas3zipperthatgoesaroundthebackoftheshoesoyoucanziptheshoeopen4onehandtomoreeasilygetafootinorout.TheshoehasbeenindevelopmentforsometimeunderNikedesignerTobieHatfield.ButitwasaletterfromteenagerMatthewWalzertoNikeCEOMarkParkerin2012thatreallyinspiredtheteam5designtheproductandbringtheFlyeasetomarket.Whenhe6writetheletterWalzerwasinhighschooldoing7manyteenagersofhisageweredoing﹣thinkingaboutgoingtocollege.ThedifferenceforWalzerwasthathehascerebralpalsy大脑性麻痹症8madeitimpossibleforhimtotiehisshoesonhisown.Hisdreamwastogotothecollegeofhis9choosewithoutworryingabouthowtotiehisshoeseveryday.NowatFloridaGulfCoastUniversityWalzergetsaroundcampusinhisnewFlyeaseshoes101ookprettyhappyaboutit.
Ibelieveyoucandoyourbest.Notbeingthebestbuttoughingthelimitsofwhatyou'recapableof.Igainedthisbelieffrommythirdgradeteacherthemostspecialhonoredtrustworthyandlovedpersoninmylife. Mr.Myruswasalwaysperfectlydressedandspokewiththebeliefthattalkingtoeight﹣year﹣oldsdidn'tmeanhehadtosacrificeproperstatementsorgrammars.Andhewasdemandingbuthewasn'tunreasonableorcruel.Hesimplyfeltthatnomatterwhatyourbestwasyoushouldachieveit. AsluckwouldhaveitImethimagainasmyeighthgrademathteacher.Iwasnotnoreverwillbegiftedinmath.Iremembermystrugglesinclass.Idon'tknowtheanswerIwouldsayIcan'tdoit!Perhapsyoudon'tknowtheanswerhewouldsayquietly.Doyouthinkwemightfigureitouttogether?Howdoyouknowwhatyoucandountilyoutry? Mr.MyruslivedaroundthecornerandIwouldoftenstopbytotalkwhileheworkedinhisgarden.IknewtherewassomeonewholetmeknowthatifIhadreallytriedthatwasenough. Don'tbesohardonyourselfhe'dsay.Stopblamingyourself.Didyoutryyourbest?Wellthenyou'renotafailureheoftentoldmethesewords. Mr.Myrusdiedin1978.Ihadneverthoughtabouthisdeath.Hewastooyoung.Ifeltsorry.ButwhenIthinkabouthimnowIdon'tfeelsosorry.Hetaughtmetobekindnotonlytoothersbuttomyself.Hetaughtmemyownvalue.Hetaughtmeabouthonorabouttruthandaboutdoingmybest﹣andthatallfeelingsandbeliefshavedignityanddeserverespect.AndofallthethingsIknowthisIbelieveWecan'tallbethebestbutwecaneachofusbeourbestandIknowthat'struebecauseMr.Myrustoldmethat. 1WhatcanweknowaboutMr.Myrusaccordingtothepassage? A.Heusuallytreatshisstudentsinahardway. B.Heisresponsibleforhisteachingandstudents. C.Heisapersonwhoisn'tparticularaboutwhathewears. D.Hesometimesiscruelandunreasonabletohisstudents. 2Theauthorthoughthewasaluckydogbecause. A.hehadgotagreatbelieffromhisteacher B.Mr.Myrushadtaughthimforeightyears C.Mr.Myrusbecamehisteacherasecondtime D.hedevelopedagoodrelationshipwithMr.Myrus 3Itcanbeconcludedfromthethirdparagraphthat. A.theauthorpreferredothersubjectstomath B.Mr.Myrusthoughtitwasveryeasytolearnmath C.theauthorwasashamedtoadmithismathwaspoor D.Mr.Myrushelpedtheauthorbuilduphisconfidence 4Whatcanwelearnbyreadingthepassage? A.Theauthorhopedtoliveapositivelife. B.Theauthormayhavebecomeateacher. C.Theauthorlikedtorecallhischildhood. D.Theauthorendedupbeingamanofself﹣confidence.
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