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WhenIwas14yearsoldmybestfriend1dragmetoanafter﹣schooldanceclass2IenjoyedsomuchthatIhavebeendancingeversince.AftereverydanceclasshoweverIalwayshavetostretchoutmylegsandback!Itfeelslikeasmuchexerciseas3gotothegym﹣butdancingisnot4wideconsideredtobeasport. Manydancerswouldarguethatdancingisasportasitrequiresstrongmusclesandimpressiveflexibility.Nomatterwhatstyleofdanceyouareparticipatinginyouwillalwaysbeusingallof5youmuscleswhiledancingandthiscanoftenbeforseveralhoursaday. On6otherhandmanypeoplearguethatdanceisanartform.Dancesoftenexhibitemotion情感tell7storyetc.Dancingtomusiciscreativeandvisuallyappealingtotheeyesandearsjustlikewatchingaplayoran8professionband.Theshiningcostumesthestagemake﹣upandthebighairstylesareartisticandimaginative. Howeverwhetheryouconsiderdancetobeanart9asporttheimportantthingistoenjoyit!Dancingisagreatway10makenewfriendsandexercise!
下列变化中属于化学变化的是
“含氟牙膏”“加碘盐”“铁强化酱油”中的“氟”“碘”“铁”指的是
假设你是李华在你校就读的英国交换生Tom因脚部受伤住院你准备和同学们前去探望.请用英语给他写一封邮件内容包括: 1.表示关心;2.告知探望时间及参加人员;3.询问有何需求. 注意:1.词数100左右; 2.可以适当增加细节以使行文连贯. DearTom Yours LiHua
化学小组用如图所示装置研究酸碱盐的性质夹持仪器已省略． 1关闭K2打开K1和分液漏斗玻璃塞活塞向B装置中加入稀盐酸使其浸没大理石后关闭分液漏斗活塞．B中发生反应的化学方程式为． 2当B中的物质仍在反应时关闭K1打开K2．一段时间后C中的现象为充分反应后C中一定含有溶质NaCl的原因是． 3当实验结束后将装罝ABC上层淸液全部倒入同一烧杯中滴加无色酚酞溶液发现酚酞溶液无色请选用一种试剂确定溶质成分几种可能情况写出所加试剂预期现象和结论．
Formanyparentsraisingateenagerislikefightingalongwarbutyearsgobywithoutanyclearwinner.Likeaborderconflict冲突betweenneighboringcountriestheparent﹣teenwarisaboutboundaries:WhereisthelinebetweenwhatIcontrolandwhatyoudo? Bothsideswantpeacebutneitherfeelsithasanypowertostoptheconflict.Inpartthisisbecauseneitheriswillingtoadmitanyresponsibilityforstartingit.Fromtheparents'pointofviewtheonlycauseoftheirfightistheiradolescents'completeunreasonableness不理性.Andofcoursetheteensseeitinexactlythesamewayexceptoppositely.Bothfeeltrapped. InthisarticleI'lldescribethreeno﹣winsituationsthatcommonlyarisebetweenteensandparentsandthensuggestsomewaysoutofthetrap.Thefirstno﹣winsituationisquarrelsoverunimportantthings.Examplesincludethecoloroftheteen'shairthecleanlinessofthebedroomthepreferredstyleofclothingthechild'sfailuretoeatagoodbreakfastbeforeschoolorhistendencytosleepuntilnoonontheweekends.Secondblaming.Thegoalofablamingbattleistomaketheotheradmitthathisbadattitudeisthereasonwhyeverythinggoeswrong.Thirdneedingtoberight.Itdoesn'tmatterwhetherthetopicispoliticsthelawsofphysicsortheproperwaytobreakanegg;thepointoftheseargumentsistoprovethatyouarerightandtheotherpersoniswrongforbothwishtobeconsideredanauthority﹣﹣someonewhoactuallyknowssomething﹣andthereforetocommandrespect.Unfortunatelyaslongasparentsandteenscontinuetoassumethattheyknowmorethantheotherthey'llcontinuetofightthesebattlesforeverandnevermakeanyrealprogress. 1Whydoestheauthorcomparetheparent﹣teenwartoaborderconflict? A.Bothcancontinueforgenerations. B.Bothareaboutwheretodrawtheline. C.Neitherhasanyclearwinner. D.Neithercanbeputtoanend. 2WhatdoestheunderlinedpartinParagraph2mean? A.Theteensthinkitistheirparentswhostarttheconflict. B.Theteensagreewiththeirparentsonthecauseoftheconflict. C.Theteenscausetheirparentsofmisleadingthem. D.Theteenstendtohaveafullunderstandingoftheirparents. 3Parentsandteenswanttoberightbecausetheywantto. A.giveorderstotheother B.knowmorethantheother C.gainrespectfromtheother D.gettheothertobehaveproperly 4Whatwilltheauthormostprobablydiscussintheparagraphthatfollows? A.Causesfortheparent﹣teenconflicts. B.Examplesoftheparent﹣teenwar. C.Solutionsfortheparent﹣teenproblems. D.Futureoftheparent﹣teenrelationship.
化学就在我们身边我们的衣食住行都离不开化学．请利用所学化学知识回答下列问题． 1家里的烧水壶中出现了大量水垢小芳可以用检测水是否为硬水若是硬水可以用方法软化． 2妈妈为小芳准备了高钙牛奶补钙此时钙指的是填字母序号 A．纯净物B．化合物C．元素D．原子 3细心的小芳发现自己家新买的家具带有异味于是在室内放了几个活性炭包达到除去异味的目的这是利用了活性炭的性． 4近几年由于私家车数量急剧增加工业快速发展等因素致使化石燃料大量使用其对环境的影响也日益凸显．为此人们积极寻找新能源．经研究发现氨气燃烧的产物对环境没有污染．且释放出大量能量．其反应的微观示意图如图 上述反应的化学方程式为．
下列归纳总结完全正确的一组是
Althoughtherearemanydifferenttypesofgenerouspeopletherearesomecommoncharacteristicsthatthemostgenerouspeopleshare.Whethertheygivetheirtimeortheirmoneythesequalitiesarelargelysharedbypeoplemostdevotedtogivingbacktotheircommunitiesandfamilies. Unselfishness Firstandforemostgenerouspeopleareunselfish.1Personalgainmayoccurbutitisnotaninspiringfactorforthemostgenerouspeople. Optimism Generouspeopleareoptimistic.Theyhaveacertainideaofthewaytheworldshouldbeandstruggletoachievethatend.2Asoptimiststheyseetheworldinadifferentlight.Theytrulybelievethattheworldalthoughnotperfectcanbemadeintoamuchbetterplace. Trust Trustisamajorqualityamongthemostgenerouspeople.Theytrustcompletelythattheircauseisaworthyone.3Forthosewhogivethismeansatrustthattheothersassociatedwiththecausewillbeusingtheirtimeandresourceappropriately. Energy Whenyouthinkofpeoplebeinggenerousenergyisoneofthefirstthingsthatcometomind.Thesepeopledevotetheirenergytothegoodthattheywanttodo.4Whenthemostgenerouspeoplespendtheirtimeworkingonagoaltheyareenergizedtodoevenmoregood. 5Ifyouareconcernedwithincreasingyourownlevelofgenerositythesefactorswillgetyoustartedintherightdirection. A.Theyalsogainenergyfromtheircause. B.Reliablepeopleareverypopularinthecommunity. C.Theygivewithouthopesofgainingfortheirgooddeeds. D.Buttheybelievedthattheycanhelpmorepeopledogooddeeds. E.Themostgenerouspeoplesharethesequalitiestodifferentdegrees. F.Theyalsotrustthatthepeopleinvolvedwiththatcausewilldotheirbesttohelpachievethegoal. G.Althoughtheworldisnotaperfectplacethesepeopledonotstopgivingtheirtimeenergyormoney.
如图是AB两种固体物质的溶解度曲线下列说法中错误的是
如图是实验室常用的制取气体的装置请你根据所学知识回答下列问题． 1写出编号所指仪器的名称 ①②． 2以上装置图中共有两处明显的错误请你找出错误的地方并把改正的结果填在下列横线上①② 上述装置改进后请继续回答下列问题． 3小李在实验室中用氯酸钾和另一种固体制取氧气他选择上述装置中的A和填字母进行组装．小红在实验室中选用C装置作为氧气的发生装置．在他们的实验中都用到了一种相同的固体药品是填化学式在两个反应中它都起作用．请你写出小红制取氧气的化学反应方程式． 4实验室选用C和E装置还可以制取的气体是填化学式写出实验室制取该气体的化学方程式． 5装置BC都可以用来制取4中的气体比较这两个装置的不同指出B装置的一个突出优点． 6制取氢气的发生装置是理由是．有一名同学欲用G装置收集H2则H2应从导管口填“a”或“b”通入．
科学施肥是实现农业增产的主要手段．硝酸铵NH4NO3是一种常用的氮肥其中氮元素的质量分数为氮元素氢元素氧元素的质量比为．若要配制200g溶质质量分数为5%的硝酸铵溶液需要硝酸铵的质量为g需要水的质量为g．
Howtoimproveyourstudies﹣scientifically Ourbraincanpossiblymemorize2.5petabytes千兆ofinformation.Inordertousesomeofthatsurprisingcapacity能力alittlemoreeffectivelywhenyoulearnherearesometipsthatarebasedonwidely﹣acceptedresearchbylearningexperts. 1 Someenjoywatchingvideosoverreadingbooksothersstudywithfriendsandsomelikesittinginsilenceamongamillionbooks.Everybodyisdifferent. Hardthingsfirst 2sodothethingsthataredifficultfirst.Onceyouaredonewiththehardthingsyouwillfeelbetterfortherestofthedayandprobablymoremotivatedtogetotherthingsdone. Space分隔开yourstudies 3.Factsorvocabulariesforexamplearebestlearnedifyoureviewthemthefirsttimeonetotwodaysafterthestudyandthenagainafteroneweekandafteronemonth. Instantself﹣test Afteryourstudyfinishupwithaquickquiz.Immediaterecallintheformofatestorashortsummaryonwhatyou'vejustlearnedcanincreaseretention记忆力byasmuchas30%.4thatextraeffortcreatesdeepertraces痕迹inyourmemory. Don'tforceit Motivationislikehunger.Youcannotforceyourselftobemotivatedjustlikeyoucan'ttellsomeoneelsetobehungry.Soifyouarenothungryrightnowdon'tworry.5. A.Takefunseriously B.Findyourownstyle C.Takeabreakanddosomethingelse D.Goodmemorycangrowyourbrain'spotential E.Becauseit'smuchharderforyourbraintorememberthantoread F.Likemostpeopleyouhavethestrongestwillpowerinthemorning. G.torememberthingsforalongertimerepeatthematerialaftertakingseveralbreaks
Festivalsareagreatwaytoexperienceadestinationinadifferentway.Thisarticlewillfuelyourwanderlust漫游癖andguideyoutothebestfestivals. StPatrick'sDay Where:DublinIreland&NewYorkUSA When:17March StPatrick'sDayhastakenplaceinNewYorkcityonMarch17thsince1762.Onthisdaythewholecityturnsgreen.ManyIrishmaketraditionalbreadonthisday.ItisoneofthemostfundaystheoftheyearinNewYorkCityeveryyearwhenthewholecityturnsintoabiggreenparty. SXSW Where:AustinUSA When:10﹣19March Likefreethings?Yeahmetoo!Freefooddrinkandmusicsoundgood?WelcometoAustinTexas.SXSWisafestivalforthosewhoworkinthemusicandfilmindustries.Therearefreeshows.Youdihavetopaybutnotbyhandingovercash;youhavetogivesometimetoqueuebutitisworthittoseesomepopularstars. King'sDay Where:AmsterdamNetherlands When:27April EveryyearonApril27AmsterdamturnsaverybrightcoloroforangeforKing'sDaywhichisthebirthdayofKingWillem﹣Alexander.Itisacrazyfuncelebrationwhenthecenterofthecityiscarbusandbike﹣free.Itisamarketdaywhenanyonecansellprettymuchanything.Tips:Takeajacketwithyouwearorangeandbringcash. JustforLaughs Where:MontrealCanada When:14﹣30July ForcomedyloversthereisnootherfestivalintheworldbetterthanMontreal'sJustforLaughs.ThefestivalconcentratesmostofitsshowsintheLatinQuarter.Duringthedaystreetperformersdelightthecrowdsandatnightthecitycomesalivewithcomedyalloverthecity. 1WhatdoStPatrick'sDayandKing'sDayhaveincommon? A.Theyaremarketdays. B.Theyfeatureaspecificcolor. C.Theybegininthesamemonth. D.TheyareinhonorofaKing'sbirthday. 2Whichfestivalisaboutmusicandfilm? A.StPatrick'sDay. B.SXSW. C.King'sDay. D.JustforLaughs. 3WhatdoweknowaboutJustforLaughs? A.Itoffersfreefood. B.Itlastsforoneweek. C.Itisthebestcomedyfestivalintheworld. D.Itiscelebratedinmanyplacesworldwide.
Thepoorweathermayhaveaforthesmallcrowd.
干冰是固态的二氧化碳在工业生产上有着重要的用途．用微粒的观点解释下列现象． 1二氧化碳气体的密度是1.997kg/m3干冰的密度是1500kg/m3． 2在云层中撒布干冰会达到人工降雨的作用．
MyfirsttermatMIT麻省理工学院wasawesome﹣IgotallA'sandIdeclaredmathasmymajor.MyparentswereexpectingmetobecomeadoctorlikethemsoIwastryingtosatisfythem.ButIwasdesperatelyrunningawayfromthem.IhadnoideawhatIwantedtodowithmylife.MythirdtermIendedupwithaDinmath.Ididn'tdothatwellinmyotherclasseseither.Itseemedlikeallmyfriendsweredoingsowellgettingopportunitiesoverthesummers. MyfifthtermIrealizedthatIwasawfulathigher﹣levelmath.Ihadlostallconfidenceinmyself.IwenttoafewclassesatthebeginningofthetermbutafterbymidtermIhadtotallystopped.MyonlyreliefwasthedanceteamIwason.Iwouldsleepalldayandthengotodancepracticeandthengobacktosleep.AsexpectedIfailedinallofmyclassesandhadtowithdrawfromMIT. Ihadnochoicebuttotellmyparents.Insteadofyellingorhittingmethoughtheyjustheldmeandcried.Thenextdaymydadtookadayofffromworkandtookmetoanearbysmallartscollege. Ihadlostallconfidenceinmyself.BeforemyfirstbiologytestIdidn'tthinkIcouldpass.Ididpass.SinceIhadsomuchfreetimeIdecidedtojoinabiologylab.IrealizedthatwaswhatIwantedtodo!Iwantedtobeascientist! ThispastMayIgraduatedwiththehighesthonorsandnowIhavemyPhDinbiology.Thoughitendeduptakingme5yearstograduatefromcollegeIcansaynowthatdroppingoutofMITwasoneofthebestthingsthateverhappenedtome.I'verealizedthatapersonisnottheirgrades.I'verealizedhowmuchmyparentslovedme.I'vefinallydiscoveredmypassion热情inlife! 1Howwastheauthor'sfirsttermatMIT? A.Hewasbusywithexams. B.Heknewhisgoalsclearly. C.Hedidwellinallsubjects. D.Hewasfedupwithmath. 2Howdidtheauthor'sparentsreacttohisfailingatMIT? A.Theyhithim. B.Theyyelledathim. C.Theyquittheirjobstoteachhim. D.Theyforgavehimforwhathedid. 3Intheartscollegetheauthor. A.rebuilthisconfidence B.volunteeredatmanylabs C.foundithardtolearnbiology D.hatedthelearningenvironment 4Whatdoweknowabouttheauthorfromthelastparagraph? A.Hefeltsorryforhisparents. B.Hediscoveredhistrueinterest. C.Herealizedtheimportanceofgrades. D.HefeltashamedofhisfailingatMIT.
Growingplantsindoorshasalwaysbeentakenupasapopularhobby.Theycanmakeyourhomemore 1cheerandenjoyable.Peoplearekeenonthebeautifulplants2callsucculents多肉植物andthetrendisspeeding3itwayintohomesandgardenseverywhere.Noweveryonehassuddenlygrownagreenthumb. ThewordsucculentisfromtheLatinwordsucus4meansjuice.Succulentsstorewaterintheirleavesorroots.Theycomein5widevarietyofstylessizesandcolors.Withadorablefatappearancethey6describeashavinganeye﹣catchingappeal.Fromwateringtootherdetailssuccessfullykeepinganindoorplant7seemtobeatroublesomeaffair.Butsucculentsturnit8funandeasyexperience.Thesefleshyplantsdonotrequiremuchcareandcaneasilysurviveandgrow.Normallyallowthesoiltodryoutslightlybetweenwaterings.Toomuchwaterwillcauserootrot. Theirlow﹣waterlow﹣maintenancerequirementsprovidemany9benefitforindoorgardenersandmakethem10especialappealtopeopleonthego.Anyonecankeepthemaliveandhealthy.Whynotletthesegreenplantsdecorateyourroomcleantheairandaccompanyyouthroughyourlife?
Doctorsandnursesrushedtothesoftheaccidenttocarryouttherescue.
将下列固体分别放入水中溶液温度明显降低的是
如图是硝酸钾和氯化钠的溶解度曲线． 1硝酸钾的溶解度随温度升高而 2要从氯化钠溶液中提取氯化钠最好采用的方法． 3要使硝酸钾的饱和溶液变为不饱和溶液除加水之外还可采用的方法是． 440℃时饱和硝酸钾溶液的溶质质量分数比饱和氯化钠溶液的溶质质量分数填“大”或“小”．
下列化学反应过程中吸收热量的是
下列关于常见盐的用途错误的是
下列物质属于混合物的是
下列物品所使用的主要材料中属于有机合成材料的是
下列实验方案设计不合理的是
在实验室常用以下装置制取气体． 1用双氧水和二氧化锰制氧气的化学方程式为发生装置应选依据是． 2收集氧气可以选用的装置之一是依据是． 3用A装置制氧气时导管微露胶塞的原因是．
如图表示MN两种物质溶解度随温度的变化请回答 1在t2℃M物质的溶解度N物质的溶解度填写“＞”“＜”或“＝”． 2若t1℃时M物质的溶解度为20g那么N物质的溶解度为则40g水中最多能溶解N物质g． 3将t2℃时MN的饱和溶液分别降温至t1℃观察到的现象是．
碘酸钾KIO3中碘元素的化合价为
我们需要合理开发利用石油资源． 1石油是一种粘稠状液体属于资源选填“可再生”“不可再生”它主要含有两种元素填元素符号． 2石油经炼制得到的等产品可作为机动车燃料． 3以石油产品为原料可进一步生产合成纤维合成橡胶等合成材料．
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