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某同学根据铜绿的成分Cu（OH）2CO3作出猜想：金属铜锈蚀的条件除有水和二氧化碳外，还必须有氧气．为证明“必须有氧气”，需要进行如图所示实验中的（ ）
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某同学根据铜绿的成分Cu2OH2CO3作出猜想金属铜锈蚀的条件除有氧气和水外还必须有二氧化碳为证明必
甲和乙
甲和丁
乙和丁
丙和丁
某同学根据铜绿的成分Cu2OH2CO3作出猜想金属铜锈蚀的条件除有氧气和水外还必须有二氧化碳．为证
甲和乙
甲和丁
乙和丁
丙和丁
某同学根据铜绿的成分Cu2OH2CO3作出猜想金属铜锈蚀的条件除有氧气和水外还必须有二氧化碳为证明必
甲和乙
甲和丁
乙和丁
丙和丁
某同学根据铜绿的成分Cu2OH2CO3作出猜想金属铜锈蚀的条件除有氧气和水外还必须有二氧化碳．为证
甲和乙
甲和丁
乙和丁
丙和丁
某同学根据铜绿的成分Cu2OH2CO3作出猜想金属铜锈蚀的条件除有氧气和水外还必须有二氧化碳为证明
甲和乙
甲和丁
乙和丁
丙和丁
某同学根据铜绿的成分Cu2OH2CO3作出猜想金属铜锈蚀的条件除有氧气和水外还必须有二氧化碳．为证
甲和乙
甲和丁
乙和丁
丙和丁
小林同学发现铜制眼镜框表面出现了绿色物质通过学习知道该物质为铜锈俗称铜绿主要成分是Cu2OH2CO3
小林同学发现铜制眼镜框表面出现了绿色物质通过学习知道该物质为铜锈俗称铜绿主要成分是Cu2OH2CO3
下列物质的化学式俗名和分类正确的是
NaHCO3 小苏打 酸
CaO 熟石灰 氧化物
Cu2(OH)2CO3 铜绿 盐
NaOH 纯碱 碱
某同学根据铜绿的成分Cu2OH2CO3作出猜想金属铜锈蚀的条件除有氧气和水外还必须有二氧化碳为证明必
甲和乙
甲和丁
乙和丁
丙和丁
小林同学发现铜制眼镜框表面出现了绿色物质通过学习知道该物质为铜锈俗称铜绿主要成分是Cu2OH2CO3
铜在潮湿的空气也能生绣铜锈主要成分为Cu2OH2CO3某小组对铜生锈实质进行了两种猜测即:12
某同学根据铜绿的成分Cu2OH2CO3作出猜想金属铜锈蚀的条件除有氧气和水外还必须有二氧化碳．为证明
甲和乙
甲和丁
乙和丁
丙和丁
将下列短文中带点的部分用化学用语填空到了夏天太阳镜成为人们出行的一种常用保护工具太阳镜是由镜脚镜片镜
金属是人类生活中的常用的材料.1下列生活用品中主要利用金属导热性的是填字母序号.2工业上用赤铁矿主要
某同学根据铜绿的成分Cu2OH2CO3作出猜想金属铜锈蚀的条件除有氧气和水外还必须有二氧化碳．为证
甲和乙
甲和丁
乙和丁
丙和丁
问题2:小林同学发现铜制眼镜框表面出现了绿色物质通过化学学习知道该物质为铜锈俗称铜绿主要成分是Cu2
小林同学发现铜制眼镜框表面出现了绿色物质通过学习知道该物质为铜锈俗称铜绿主要成分是Cu2OH2CO3
小明发现家中铜制水阀门上有绿色的铜锈想对铜生锈的原因进行探究【查阅资料】铜锈为绿色其主要成分是Cu2
某同学根据铜绿的成分Cu2OH2CO3作出猜想金属铜锈蚀的条件除有氧气和水外还必须有二氧化碳．为证
甲和乙
甲和丁
乙和丁
丙和丁
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Researchintoworkingmemory Whenyouneedtorememberaphonenumberashoppinglistorasetofinstructionsyourelyonwhatpsychologistsandneuroscientistsrefertoasworkingmemory.It'stheabilitytoholdandprocessinformationinmindoverbriefintervals.Wecankeeponlyacertainamountofinformationinmindatanyonetime.Thesecouldbefiguresletterswordsorotherunits.It'sforthingsthatareimportanttoyouinthepresentmomentbutnot20yearsfromnow.Here'sabriefintroductiontowheretheresearchstandscurrently. Workingmemoryversuslong﹣termmemory Workingmemoryisrelatedtotemporaryactivationofneurons神经元inthebrain.Howeverlong﹣termmemoryisthoughttoberelatedtophysicalchangestoneuronsandtheirconnections.Thiscanexplainthe short﹣termnatureofworkingmemoryaswellasitsgreatersensitivitytointerruptionsorphysicalshocks. Long﹣termmemoryischaracterizedbymuchlargerstoragecapacity.Itcancontaininformationaboutaperson'sexperiencesforalifetime.Researchershavelongregardedworkingmemoryasagatewayintolong﹣termstorage.Repeatinformationinworkingmemoryenoughandthememorycanbecomealong﹣termmemory. Howdoesworkingmemorychangeoveralifetime? Performanceonassessmenttestsofworkingmemoryincreasesteadilythroughoutinfancychildhoodandtheteenageyears.Theninyoungadulthoodperformanceisatthehighestlevel.Ontheotherhandworkingmemoryisoneofthecognitiveabilitiesmostsensitivetoagingandperformanceonthesetestsdeclinesinoldage. Theriseandfallofworkingmemorycapacityoveralifespanisthoughttoberelatedtothenormaldevelopmentanddeclineoftheprefrontalcortex前额皮质inthebrainanarearesponsibleforhighercognitivefunctions.Anydecreaseinthefunctioningofthisareaislikelytoaffectmanydifferentaspectsofcognitionemotionandbehavior. Improvingyourworkingmemory Theimprovementofworkingmemoryisamajordrivingforceofcognitivedevelopment.AtheoryofcognitivearchitecturecalledGlobalWorkspaceTheorysuggeststhatinformationheldtemporarilyinmindispartofaglobalworkspaceinthemindwhichconnectstomanyothercognitiveprocessesandalsodetermineswhatweareconsciousofinanygivenmoment. Thereissomeevidencethatit'spossibletotrainyourworkingmemoryusinginteractivetaskssuchassimplegamesforchildrenthatinvolvememoryability.Ithasbeensuggestedthatthistraininghelpschildrenimprovescoresonothertypesoftaskssuchasthoseinvolvingvocabularyandmathematics. Workingmemoryiscentraltothefunctioningofthemind.Itrelatestomanymoregeneralabilitiesandoutcomes﹣thingslikeintelligenceandacademicachievements.Henceithasbecomeincreasinglyimportantinsolvingthemysteryofunderstandingconsciousnessitself. Researchintoworkingmemory 1of workingmemory Workingmemoryreferstotheabilitytokeepthingsinmindovertheshorttermwhichhasashorterstoragecapacity. 2betweenworkingmemoryandlong﹣term memory •Long﹣termmemorywhoseinformationis3concernsphysicalchangestoneurons. •Workingmemoryis4totemporaryinterruptions. Oncerepeatedalotit5intolong﹣termmemory. Changesofworkingmemoryoveralifetime Afterstableimprovementperformanceofworkingmemoryreachesa 6inyoungadulthood.Howeveritfallsinto7 inoldage. Significanceof improvingworkingmemory •Theimprovementofworkingmemorycangreatly8 thedevelopmentofcognition. •Interactivetaskshelpimproveworkingmemory.Childrenwhoachievehighscoresinvocabularyandmathsareliving9. Conclusion 10itscentralroleinourmentalliferesearchinto workingmemorymatters.
下列试验中发生了化学变化的是
InlateMarchof2018atearintheearthabout15meterswideand20metersdeepsuddenlyappearedinKenya.Itcutacrossroadsandevensplithousesintwo.Thiscrackappearedoutofnowhereafterheavyrainsandanincreaseinseismic地震的activity.Somescientistsbelievethatit'sfurtherproofthatAfricaisslowlysplittingapart. OnceaverylongtimeagoAfricaandSouthAmericawereonelandmassbeforetheyseparated.SimilarlyonedayintheverydistantfuturealargepartofEastAfricawillsplitofffromtherestofthecontinent.Thiswillcreateanewlandmassandanewocean.Thebreakupisaresultofplatetectonics板块运动thegradualmotionofdifferentpartsoftheEarth'scrust地壳. WhenplatesoftheEarthseparateandtearawayfromeachotheritiscalledrifting开裂.Theresultisariftvalley.Scientistsdon'tunderstandtheexactmechanismbehindriftingbuttheresultsareeasytoobserveintheEastAfricanRiftSystemEARS.That'swhystudyingthispartoftheworldissoimportant. TheEastAfricanRiftSystembeginsinthenorthinEthiopiawherethreeplatesaremovingawayfromeachother.TwoofthemarecontinentalplatestheAfricanandArabianplates.Theyaretectonicplatesthathavealargelandmassabovewater.ThethirdistheSomaliplateconsideredaminorplatewhichissteadilymovingawayfromtheothertwo.Butdon'tplanonvisitingthenewoceananytimesoon.Theplatesaremovingatarateofabout6millimetersayear.Atthatspeedmillionsofyearswillpassbeforeanewoceanisformed. EARSisnotallbadnewsforKenya.Ariftvalleyiscomposedofanareawherethereisincreasedvolcanicactivityandthinnedplanetarycrust.Thismakesiteasiertotakeadvantageofthepowerofsteam.ForKenyathismightbeananswertothecountry'selectricalproblems.Thedroughtconditionsthatfrequentlyoccurtheremakeitdifficulttoproduceenergy.Butthegeothermal地热的powerplantsgoingonlinein2019willallowthemtoproducecleanenergywithverylittlewater. 1Whatcanbeconcludedfromthepassage? A.AwarwillcertainlybreakoutinAfrica. B.AdisasterwillsuddenlystrikeAfrica. C.AgeologicalstructurewillchangeinAfrica. D.AnewcountrywillcomeintobeinginAfrica. 2Whichofthefollowingplatesmightbesurroundedbywateraccordingtothepassage? A.EastAfrica. B.Somaliplate. C.Arabianplate. D.Africaplate.
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RecentlyIrolledintoalocalrestauranttotryanImpossibleBurgeranall﹣plantmeat﹣likepieinventedbytheSiliconValleycompanyImpossibleFoods.It'sfamousforhavingaweirdlychewyevenbloodymeat﹣likequalityasurprisingverisimilitude逼真thathasmadeitperhapsthecountry'smostfamousburgerasNewYorkmagazinerecentlywrote.OnebiteintoitsgorgeoussmokyflavorandIwasconvinced. Thisisgoodnewsbecausethetimehascometomass﹣producefake假的meatfast.Why?Becauseinthefighttoeaseclimatechangemeatreplacementisoneofthelowest﹣hangingfruits. Meatproductionchewsuplandandletsoutmethane沼气bythekilotonaccountingforabouttwo﹣thirdsofallgreenhousegasemissionsfromagriculture.AUniversityofOxfordstudyrecentlyfoundthattokeepglobalwarmingbelow2degreesthiscenturyweneedtobeeating75percentlessbeefand90percentlessporkglobally.WithoutconcentratedchangewereallyriskgoingbeyondkeyenvironmentallimitsMarcoSpringmannoneoftheOxfordresearcherswarnsme. Dietsareculturallyenshrined神圣的sochangingthemwillbehard.Fakemeatcanhelpcamouflage掩饰thatdramatictransformationwithslightadjustment. Stilleventhemostexceptionalsubstitutesformeatfaceahugechallengeifthey'regoingtoreplace75to90percentofbeefandpork.ThefirsttasteofanImpossibleBurger﹣amomentwhenlowexpectationsworkapowerfulmagicintheproduct'sfavor﹣isonething.Buthowdoyoukeepmeat﹣eatersaskingformoreaftertheirsixthandtheir26th? Fortunatelythesciencehereisplayinganimportantrole.ImpossibleFoodsowesmuchofitsappealtoabioengineeringprocessthatturnsoutbigblood﹣redtanksofhemeacrucialmolecule分子thatgivesveggie素食主义者meatthatslightlymetallicbloodyflavorasDavidLipmanchiefscienceofficerofImpossibleFoodstellsme.Meanwhileculturedmeatcreatedbygrowingactualanimalcellsinabasinisbecomingareality.InNewYorkthescientistsatOceanHuggerFoodshaveengineeredaprocesstotransformtomatoesintomocktuna.AndoverintheNetherlandsacompanycalledTheVegetarianButcherisdevelopingaNespresso﹣styledeviceYoupourinabagofvegetableprotein蛋白质andoutpopsfakemeat.Thecompanyaimstoreleaseitintwoyears. Togettotruemassadoptionfakemeatwillneedtocompetefavorablywiththerealthingonmultiplefronts.ImpossibleFoods'goalistodrivethepriceofitsproductbelowthatofSafeway's80/20hamburgermeatatwhichpointpeoplewillsimplyvotewiththeirwallets.Thenewindustryalsowantstoimproveonanimalfleshinvariousways.Fakemeatwilloutcompetetraditionalmeatbecauseyouwon'tneedtorefrigerateitifyou'remakingitasyougoco﹣founderNikoKoffemansays.That'dgiveunmeatanenormousadvantageforenergy﹣poordevelopingregions.Plusfakemeatcouldprovidemorechoices.YoucouldhaveverysoftandtendermeatforelderlypeopleKoffemanadds.Youcouldhaveacustommeatforwhateveryouneed. Wecouldspeedthisdietaryshiftwithsmartpublicpolicytoo.Beginningin2006NewYorkCitycutthenumberofadultsconsumingoneormoresugarydrinksperdayby35percentbyrunningappealingpublicservicecampaignsandrequiringthelabelingoftheirhighcaloriecounts含量infast﹣foodrestaurants.ImaginesimilarmeasurespromotingfakemeatSavetheplanetbitebybite.Saveyourhealthtoo.Speakingofyourconscienceindustrial﹣scaleanimalfarmingisethically道德上unpleasant. Youcantelltheworldisshiftingthiswaybecausetheranchers牧场主arenervous.LastyeartheUSCattlemen'sAssociationaskedthegovernmenttodefinemeatasaproductobtaineddirectlyfromanimals.Thatanxietywhichisnodoubtcausedbysciencegoestoshowthatthisgrandshiftisn'timpossible. 1TheauthorwasconvincedbytheImpossibleBurgerbecause. A.itlookslikeatraditionalmeatburger B.itcontainsnomeatbuttasteslikemeat C.itsflavorisdifferentfromthatofnormalones D.morevegetablesareusedintheburger 2Whatdoestheauthormeanbysayinglowesthangingfruitsinparagraph2? A.Ataskthatisdifficulttofulfill. B.Anapproachthatiseconomical. C.Aproductthatisenvironment﹣friendly. D.Agoalthatiseasytoachieve. 3Theauthorismostlikelytoagreethat. A.fakemeatisworthyofinvestmentforitsgreatpotential B.fakemeatcannotchangepeople'sdietaryhabits C.adeclineinmeatconsumptioncanrelieveglobalwarming D.fakemeatwillreplacerealmeatbecauseofitslowerprice 4Fakemeathasanadvantageovertraditionalmeatinthat. A.fakemeatwillnotbenecessarilystoredinarefrigerator B.thepriceoffakemeatwillbeone﹣fourthofthetraditionalmeat's C.fakemeatwillwinovertheolderpeoplethankstoitsquality D.fakemeathasabloodyflavorthatisnotfoundintraditionalmeat 5Whatcanbeinferredfromthelastparagraph? A.TheUSgovernmentdoesn'tgiveenoughsupporttoranchers. B.Theworldwillprobablyaccepttheideaoffakemeat. C.Peopledon'tliketoeatmeatproducedbytheranchersnow. D.Thedefinitionofmeathasbeenrevisedbecauseoffakemeat. 6Whichisprobablythesuitabletitleforthepassage? A.Let'sspeedupthedietaryshift B.Let'swelcomethefakemeat C.Fakemeatortraditionalmeatmustwechoose? D.Traditionalmeatanenvironmentkiller
如图为甲乙两种固体在水中的溶解度曲线下列说法正确的是
UndertheBeltofRoadconcreteprojectsandmeasuresarewithlocaldemandstoaccelerateeconomicdevelopment. A.parallel B.consistent C.paralyzed D.equivalent
NotonlydoesEnglishhavemanygrammaticalrulesbuttherearealsohundredsofexceptionstothoserulesonecanmasteronlythroughyearsofdedicationandenergy. A.where B.that C.which D.what
Whenaskedwhetherthereisanidealnumberofchildrentohavemanyparentsgivemultiplesometimesconflictinganswers.IntheUnitedStatesnearlyhalfofadultsconsidertwotobetheidealnumberofchildrenaccordingtoGallupsurveyswiththreeasthenextmostpopularoptionpreferredby26percent. Thetwo﹣childidealisamajordeparturefromhalfacenturyagoIn1957only20percentofAmericanssaidtheidealfamilymeanttwoorfewerchildrenwhile71percentsaiditmeantthreeormore.Theeconomyseemstohaveplayedsomeroleinthisshift.StevenMintzahistorianattheUniversityofTexasatAustinsaysthatnumberdroppedasthecostofraisingchildrenroseandasmorewomenenteredtheworkforceandfeltagrowingsenseoffrustration沮丧aboutbeingreducedtochildbearingmachines. __________AsaparentwhoprizeshisownmentalandphysicalhealthsaysRobertCrosnoeasociologyprofessorwhoisalsoattheUniversityofTexasatAustinIhadtostopattwobecausethisnewstyleofintensiveparentingthatpeoplefeeltheyhavetofollowthesedaysreallywearsoneout. Atthesametimehavingonlyonekidmeansparentsmissoutontheopportunitytohaveatleastoneboyandonegirlanarrangementtheyhavetendedtopreferforhalfacentury.Thoughinthelongrunoneresearcherfoundthathavingallgirlsorallboysdoesn'tmeaningfullyaffectthehappinessofmotherswhowantedatleastoneofeach. Perhapsthemostmeaningfuldifferenceisn'tamatterofgoingfromonetotwochildrenortwotothreebutfromzerotoone.Havingjustonechildmakesvariousaspectsofadults'lives﹣howtimemoneyemotionandmindareusedandhownewsocialnetworksareformed﹣child﹣centeredsaysKeiNomaguchiasociologistatBowlingGreenStateUniversity.Ifyouwanttoenjoyadult﹣centeredlifeloveexpensiveleisureactivitiescherishcloserelationshipswithyourpartnerandbothyouandyourpartnerwanttodevoteyourtimetoyourcareerszerokidswouldbethechoice. Mothersofcoursestandtolosemorethanfatherswhentheyhavekidsintheirhousehold.Havingchildrenismorestressfulforwomenthanitisformenandmotherssufferprofessionallyafterhavingchildreninawaythatfathersdon't. Whethertheidealnumberofchildrenisgreaterthanzeroisaquestionmanyresearchershavetriedtoaddress.A2014reviewofexistingresearchwhoseauthorswereskepticalofovergeneralizationsthatmostparentsaremiserableorthatmostparentsarejoyfuldiscoveredotherbroadpatternsBeingaparenttendstobealesspositiveexperienceformothersandpeoplewhoareyoungsingleorhaveyoungchildren.Andittendstobemorepositiveforfathersandpeoplewhoaremarriedorwhobecameparentslaterinlife. 1Whichofthefollowingcanbebestfilledintheblankinparagraph3? A.Thecostsofraisingchildrenarenotjustfinancial. B.Familieswithtwochildrenhavebeenpopularsincethen. C.Besidesthewaysofraisingchildrenhavechanged. D.Manyparentsalsofindraisingchildrenquitetiring. 2AccordingtoKeiNomaguchiafemalecandidatefordepartmentmanagermaydecideto. A.tohavenochild B.haveoneboyandonegirl C.devotemoretimetochildren D.sacrificehercareerforchildren 3Itcanbeinferredfromthepassagethat. A.morewomenfeeldisappointedwiththeirchildren B.coupleswithoneboyandonegirlfeelthehappiest C.fathersdon'thaveanyproblemswiththeircareers D.thehappinessofhavingchildrenvariesindividually 4Thepassagemainlytalksabout. A.theidealnumberofchildrenfamiliesprefertohave B.thereasonsbehindthechangeinpeople'sideaofraisingkids C.whatnumberofchildrenmakesparentshappiest D.differentopinionsresearchershaveofwhethertohavekids
Therumoraboutmesoquicklythateverypersoninmycompanyknowsitinashorttime. A.develops B.transforms C.accelerates D.circulates
Whileabruteforceapproachtolearningmaygetthejobdoneit'snotnecessarilythebeststudyplan.Wedugthroughscientificresearchtoidentifyfivestudymethodsthatarerecommendedbycognitivescientists.Thesestudytipsmayimprovetheefficiencyofhowyoustudyhelpingyoutolearnmoreinlesstimeandkeepitlonger. Don'tWaitUntiltheLastMinute Parentsandteachersoftenwarnthatcrammingforexamsisn'tthebestwaytogetgoodgrades.There'ssciencetobackthisup.Researchersfoundthatfinaltestresultsimprovedwhenstudyingwasspacedoutovertime.Thisspacingeffecthasbeenrepeatedlystudiedandoneresearchexperimentfounda36%improvementingradesbecauseofspacingoutstudysessions.Byspacingoutstudysessionsthere'saneural神经的processoflearningforgettingalittlebitandre﹣learning.Thesecyclesarewhatbuildstrongermemory. UsePracticeTests Usingpracticetestswhilepreparingforexamscanhelpyouimproveyourperformance.Thislearningstrategyisn'tjustaboutbecomingfamiliarwithatestingformatit'saboutreinforcingthebrain'smemory. Rememberthatre﹣readingmaterialcanrefreshyourawarenessbutitwon'thelpyoubuildthememoryrecallskillsthatcanhelpyouknowthecorrectanswerduringyourexam.Abetterwaytostudyistouseflashcardsorsamplequizzesfromyourtextbook. DoOneThingataTime Researchshowsthatmultitaskingisn'tgoodforyourmemorysowhenyou'restudyingthat'stheonlythingyoushouldbedoing.ConsideryourbrainpowersimilartoyourInternetbandwidth.Multipledownloadsatthetimewillslowthingsdown.Similarlymultitaskingcausesanincreasedcognitiveloadforyourbrainreducingyourabilitytopayattentiontowhatyou'relearning. Infactresearchersfoundthatevenminimalmultitaskinghasaneffect.Somethingassimpleaswalkingaroundatrackwhilelearningvocabularywordscauseda17%reductionintestscores. AddVariety Whileit'sagoodideatoonlystudyforonesubjectatatimescientistsfoundthatalternatingbetweensubtopicscoulddramaticallyimprovememory. Thisprocessknownasinterleavingmeansthatyou'llcyclethroughaboutthreesubtopicslearningalittlebitmoreabouteachduringeachcycle.Onceyou'vefullystudiedthissetandhaveanunderstandingofthematerialyoucanmoveontothenextsetandrepeatthepattern. TeachaFriend It'slongbeensaidthatthebestwaytolearnsomethingistoteachittosomeoneelse.KnownastheprotégéeffectthislearningtheorydatesbacktoancientRome. Thereasonthestudytechniquehaslastedsolongisthatit'seffective.Researchersfoundthatevenexplainingclassmaterialtoyourselfcouldresultinthreetimesbettertestscoresthanthoseofotherstudentsputtingyouwellahead. Fivelearningstrategiestobe1inyourstudy Passageoutline Supportingdetails Don'twaituntilthelastminute ●Thereisscientificevidenceto2thefactthatcrammingforexamsdoesnotnecessarilybringaboutgoodgrades. ●Insteadofspacingoutstudysessionsstudentstendtopreparefortheirtestsina3. Usepracticetests ●Practicetestsarenotmerelyintendedtomakestudents4withtestingformatsbutreinforcedthebrain'smemory. ●Re﹣readingmaterialcanmakeyou5ofwhatyouhavelearntwhileflashcardsorsamplequizzescanbuildmemoryrecallskills. 6multitasking Multipletaskscanreducetheabilitytofocusonwhatisbeinglearned. Involvesubtopicsinyourstudy ●Studyingforonesubjectatatimeisrecommendedbutalternatingbetweensubtopicsleadstodramatic7inmemory. ●Interleavingisalearningprocesswherestudentslearnaboutthreesubtopicsineach8. Teachafriend ●Protégéeffectisalearningtheoryinwhichstudentscan9fromteachingsomeoneelse. ●Explainingclassmaterialtooneselfmay10.
请阅读下面文字及图片并按照要求用英语写一篇150词左右的文章. SoCloseYetSoFar WhereamI?WhatamIdoing?Ifyou'reoneofmy500friendsonlineyou'llalwaysbethefirsttoknow.MyphoneandlaptopareneveroutoftouchingdistancesoI'mconstantlypostingupdatesonsocialmedia﹣whetherI'mhavingacoffeeonmywaytoschoolwatchingTV…evenwhenI'mintheshower.Ihaveanever﹣endingflowofmessagesandupdatesfromallthepeopleIassociatewithonline. Iliveinauniversitydormwithacoupleofgreatroommates.YetthetruthofthematterisIfeellonely.AfewdaysagoIwentoutforadinnerget﹣togetherwithsomefriends.Mybestfriendleftthetablefor30minutesbecausehehadtotakeacall.Somespentthedinnerbentovertheirphonestextingfriendsonlinebutignoringtheonewhosatrightinfrontofthem.Andtheextraordinarythingisnoonethoughtthiswasrudeit'sjusthowlifeisnowadays. 【写作内容】 1.用约30个单词概述上述文字所描述的现象 2.分析造成该现象的原因两至三点 3.请你给Mark提两到三条建议. 【写作要求】 1.写作过程中不能直接引用原文语句 2.作文中不能出现真实姓名和学校名称 3.不必写标题. 【评分标准】 内容完整语言规范语篇连贯词数适当.
HowtoStrengthenWillpower Manypeoplebelievewithmorewillpowertheywouldalleatrightexerciseregularlyavoiddrugsandalcoholstopprocrastinating拖延andachieveallsortsofnoblegoals.Willpowerisnotanewconceptbutwestilldonothavewidespreadawarenessofit. Asitturnsoutyourwillpowerislikeamuscle.Andsimilartohowyourmusclesgettiredattheendofaworkoutthestrengthofyourwillpowerfadesasyoumakemoredecisions.Thismakessense.InaresearchstudypublishedbytheNationalAcademyofSciencespsychologistsexaminedthefactorsthatimpactwhetherornotajudgeapprovesacriminalforparole假释.Atthebeginningofthedayajudgewillgiveeachcaseafairshot.Butastheirenergystartstofade?Denydenydeny. Alargebodyofresearchhasbeendevelopedinrecentyearstoexplainmanyaspectsofwillpower.Mostoftheresearchersexploringself﹣controldosowithanobviousgoalinmindHowcanwillpowerbestrengthened? Avoidingtemptationisoneeffectivestrategyformaintainingself﹣control.InWalterMischel'smarshmallow软糖studythechildrenwhostareddirectlyatthetreatwerelesslikelytoresistitthanwerekidswhoclosedtheireyesturnedawayorotherwisedistractedthemselves.Thisprincipleappliestoadultstoo.Onerecentstudyforinstancefoundofficeworkerswhokeptcandyinadeskdraweratelessthanwhentheykeptthecandyinplainsight. Anotherhelpfultechniqueforimprovingself﹣controlisanimplementation履行intention.ForexamplesomeonewhoiswatchingtheiralcoholintakemightsaybeforeapartyIfanyoneoffersmeadrinkthenI'llaskforclubsoda.Researchamongadolescentsandadultshasfoundthatimplementationintentionsimproveself﹣controlevenamongpeoplewhosewillpowerhasbeenreducedbylaboratorytasks. Justlikeamusclethatgetstiredwithheavyusethereisanotheraspecttothemusclecomparison.Whilemusclesbecomeexhaustedbyexerciseintheshorttermtheyarestrengthenedbyregularexerciseinthelongterm.Similarlyregularlyexercisingself﹣controlmayimprovewillpowerstrength. Theevidencefromwillpower﹣depletionstudiesalsosuggeststhatmakingalistofresolutions心愿onNewYear'sEveistheworstpossibleapproach.Beingusedinoneareacanreducewillpowerinotherareassodon'ttrytoquitsmokingadoptahealthydietandstartanewexerciseplanatthesametime.Takinggoalsonebyoneisabetterapproach.Onceagoodhabitisinplaceyou'llnolongerneedtodrawonyourwillpowertomaintainthebehavior.Eventuallyhealthyhabitswillbecomeroutineandwon'trequiremakingdecisionsatall. Sonexttimeinthefaceoftemptationyoudon'thavetoworryaboutthedrainonyourwillpower.Withproperapproachesyoucantrainyourwillpowertostaystrong. A1resource ★Justlikemusclewillpowerdecreasesasyouuseitmore. Intheparoleinstancethejudgemademore2judgementsastimepassed. Waystostrengthenwillpower ★Willpowercanbemaintainedby3awayfromtemptations. Researchfoundthatofficeworkersatelesscandywhenitwasoutof4. ★Havinga5aheadoftimewillnotexhaustyourwillpowerwhenmakingdecisions. Forexampleonemaydecidebeforeapartythatifofferedadrinkaskforsoda6. ★Willpowercanbestrengthenedthroughregular7. ★Don'ttrytoaccomplishtoomanygoalsata8. AsevidenceshowsNewYearresolutionsdon'tworkbecauseyourwillpoweris9up. Good10aboutwillpower Peoplecanstrengthentheirwillpowerwiththerightapproaches.
有一赤铁矿样品主要成分为氧化铁某学校化学兴趣小组为了测得样品中氧化铁的质量分数进行了如下探究小明取10g赤铁矿样品杂质不溶于水和酸不断加入稀盐酸到固体的质量不再减少加入稀盐酸的量如图所示求 1所使用的稀盐酸的溶质质量分数 2当稀盐酸和赤铁矿恰好完全反应时所得溶液的质量是赤铁矿总氧化铁的质量分数是． 3问题讨论小亮也取用10克赤铁矿样品在试管中通入一氧化碳一段时间后加热最后试管内残留固体质量是8.2g小亮比小组所测得的结果氧化铁的质量分数比小明的填偏大偏小无影响原因可能是．写一种即可
如图中与对应的实验像符合的是
下表除去杂质的方法正确的是
Someoftheworld'smostfamousmusiciansrecentlygatheredinParisandNewOrleanstocelebratethefirstannualInternationalJazzDay.UNESCOUnitedNationsEducationalScientificandCulturalOrganizationrecently1April30asadaytoraiseawarenessofjazzmusicitssignificanceanditspotentialasaunifying联合voice2cultures. Despitethecelebrations3intheU.S.thejazzaudiencecontinuesto4andgrowolderandthemusichasfailedtoconnectwith5generations. It'sJasonMoran'sjobtohelpchangethat.AstheKennedyCenter'sartistic6forjazzMoranhopesto7theaudienceforjazzmakethemusicmore8andpreserveitshistoryandculture. Jazzseemslikeit'snotreallyapartoftheAmerican9MorantellsNationalPublicRadio.WhatI'mhopingtoaccomplishisthatmygenerationandyoungerstartto10andunderstandthatjazzisnotblackandwhiteanymore.It'sactually11andit'sactuallydigital. Moransaysoneofthe12withjazztodayisthattheentertainmentaspectofthemusichasbeenlost.Themusiccan'tbe13todaythewayitwasin1908or1958.Ithastocontinuetomovebecausethewaytheworldworksis14saysMoran. LastyearMoranworkedonaprojectthat15FatsWaller'smusicforadancepartyjusttokindofputitbackinthemindthatWallerisdancemusic16itisconcertmusicsaysMoran.Formeit'stherecontextualization情景重构.Inmusicwheredoesthe17lie?Areweashumansgainingany18intohowwetalkaboutourselvesand19somethingasabstractasaCharlieParkerrecordgetsusintoadialogueaboutouremotionsandourthoughts?SometimeswelosesightthatthemusichasawidercontextsaysMoransoIwanttocontinuethose20. 1A.saluted B.set C.marked D.laid 2A.through B.around C.across D.outside 3A.regardless B.thus C.though D.rather 4A.expand B.boycott C.extend D.shrink 5A.younger B.smaller C.elder D.larger 6A.inventor B.adviser C.visitor D.officer 7A.widen B.strengthen C.enforce D.enrich 8A.available B.admirable C.avoidable D.accessible 9A.category B.appeal C.appetite D.recipe 10A.reconstruct B.reshape C.restore D.reconsider 11A.colorful B.meaningful C.creative D.sensitive 12A.connections B.problems C.satisfactions D.conflicts 13A.described B.revealed C.presented D.exposed 14A.transferring B.changing C.recovering D.processing 15A.managed B.arranged C.conveyed D.conducted 16A.asmuchas B.aslongas C.asfaras D.assoonas 17A.reality B.emotion C.melody D.future 18A.comprehension B.access C.appreciation D.insight 19A.why B.which C.how D.what 20A.trends B.dialogues C.messages D.contexts
如图所示有一斜面长为L高为h现用力F沿斜面把物重为G的物体从底端匀速拉到顶端．已知物体受到斜面的摩擦力为f则下列关于斜面机械效率η的表达式正确的是
We'reallusedtothelatestgenerationsofmobiletelecoms﹣sois5Gjustanotherupgrade?Farfromit﹣5Gisahugeleapforward﹣liketheshiftfromthehorseandcarttocars.Anditisn'tjustanetwork5Gwillbecomethefoundationoftheentireglobaldigitaleconomycapableofgeneratingtrillionsofpoundsofvalue. Everyoneandeveryindustrywillfeelitseffects.Comparedtotoday5Gwillbe10to20timesfasterandsupportbillionsofdigitaldeviceswithmuchgreaterreliabilityandsecurity.5GprovidestheplatformfortheInternetofThings﹣everythingfromself﹣drivingcarstoenhancedmedicalandsocialcaretoallmannerofnewindustrialandbusinessapplications.Wellestablishedonlineserviceslikemediaandentertainmentwillseesignificantimprovementssuchasultra﹣highdefinitionvideoandverylowlatency延时onlinegaming. 5Gcouplesafullfibrefixednetworkapproachwithhighcapacityhighreliabilityandlowlatencymobileplusadvancedsoftwareapproachessuchasedgecomputingandnetworkvirtualisation.Newtechniquessuchasnetworkslicingallowdifferenttypesofservicestorunatthesametimevastlyincreasingthescopeofapplicationsandservicesthatcanbesupported.Ineffectone5Gnetworkcanactasthousandsorevenbillionsofvirtualnetworkseachspecialisedforaparticulartaskordedicatedtoasinglecustomerbutallrunningononephysicalinfrastructure. Whileconsumersmaybethemostobviousbeneficiariesoffastermoreintelligentandusefulservices5Gwillalsobringenormousbenefitsandopportunitiestobusinessesbyallowingenhancementsanddifferentiatorstoexistingproductsandservicesorbyprovidingaplatformforentirelynewdigitalservices.5Gisanindustrialgame﹣changerandonethatyoucan'tignore.Withtrialsenablingtechnologyalreadyunderwayaroundtheworld5Gwillbecomeanincreasingrealitywithinthenextcoupleofyears. 5GisofsuchcriticalimportancetotheUKeconomythattheGovernmentisstronglybackingeffortstohelptheUKbecomeamarketleaderinexploitingthetechnology.IthasrecentlypublishedastrategytocreateanexcitingUK5Gworldandarrangetheactionsneededtospeeditsintroduction.Itisactivelycoordinatingeffortstoacceleratemaking5Garealityandisfundingtrialsofthetechnologyground﹣breakingapplicationsandinnovativebusinesspartnershipsacrossawiderangeofurbanandruralapplications. 1Whatcanwelearnabout5Gfromthisarticle? A.5Gwillbearegularupgradeofthelatestgenerationsofmobiletelecoms. B.5Gwillbemorereliableandsecurethantheearliergenerationsofmobiletelecoms. C.5Gwillalloweverysinglecustomertohaveonephysicalinfrastructuretorun. D.5Gwillbeontrialaroundtheworldwithinthenextcoupleofyears. 2Whatdoestheunderlinedwordbeneficiariesinparagraph4probablymean? A.Peoplewhomakecontributions. B.Peoplewhomakegains. C.Peoplewhohavecreativity. D.Peoplewhosufferlosses. 3WhatattitudedoestheUKholdtowards5G? A.Hesitant. B.Cautious. C.Concerned. D.Ambitious.
Ataskoftoppriorityforthelocalgovernmentistoappropriatemeasurestominimizetheexposureoflocalresidentstothedensesmog. A.meetupwith B.comeupwith C.getawaywith D.doawaywith
Inthelearningprocessaslongasmemoriesistiedtoaspecifictypeofsoundthesoundseemstobeabletobringbackaliveandstrengthenthelearnedinformation. A.reluctantly B.previously C.cautiously D.voluntarily
HITsongarebigbusinesssothereisamotiveforcomposerstotrytocleverlygainthoseingredientsthatmightincreasetheirchancesofsuccess.Thishoweverishard.Songsarecomplexmixturesoffeatures.Howtoanalyzethemisnotobviousandismademoredifficultstillbythefactthatwhatispopularchangesovertime.ButNataliaKomarovaamathematicianattheUniversityofCaliforniaIrvinethinksshehassolvedtheproblem.AsshewritesinRoyalSocietyOpenSciencethisweekhercomputeranalysissuggeststhatthesongscurrentlypreferredbyconsumersaredanceableparty﹣likenumbers.Unfortunatelythoseactuallywritingsongsprefersomethingelse. DrKomarovaandhercolleaguescollectedinformationonmusicreleasedinBritainbetween1985and2015.Theylookedinpublicrepositories仓库ofmusicmetadatathatareusedbymusicloversandacademics.Theycomparedwhattheyfoundintheserepositorieswithwhathadmadeitintothecharts. Metadataareinformationaboutthenatureofasongthatcangivelistenersanideaofwhatthatsongislikebeforetheyhearit.TherepositoriespresentedDrKomarovaandherteamwithmorethan500000songsthathadbeentaggedbyalgorithmswhichhadbeentrainedtodetectnumerousmusicalfeatures.Thetagsincludedadozenbinaryvariablesdarkorbrighttimbrecanorcannotbedancedtovocalorinstrumentalsungbyamanorawomanandsoon.Theteamfedallofthisinformationintoacomputerandcomparedthefeaturesofsongsthathadmadeitintothechartsroughly4%ofthoseintherepositorieswiththoseofsongsthathadnot. Overalltheteam'sresultssuggestedthatsongstaggedashappyandbrighthavebecomerarerduringthepast30yearstheoppositeshavethereforeappearedwithgreaterfrequency.Thatwasnothoweverreflectedinwhatmadeitintothecharts.Chartsuccesseswerehappierandbrighterthoughalsolessrelaxedthantheaveragesongsreleasedduringthesameyear.Charttopperswerealsomorelikelythanaveragesongstohavebeenperformedbywomen.Allthisisimportantinformationforexecutivesofmusiccompanies. DrKomarovausedtheseresultstotrainhercomputertotrytopredictwhetherarandomlypresentedsongwaslikelytohavebeenahitinagivenyear.Themachinecorrectlypredictedsuccess75%ofthetimecomparedwiththe4%ratethatguessingsuccessatrandomfromthemusicdatabasewouldyield﹣somethingelsemusicexecutivesmightpayattentionto. 1WhatcanwelearnfromParagraph1? A.DrKomarovaisfromCalifornia. B.Popularsongsdonotstaythesameastimegoesby. C.Songwritersknowexactlywhatittakestocreateahitsong. D.Consumersagreewithsongwritersabouttrendingmusic. 2Whichofthefollowingistrueaboutthemetadata? A.Ithelpsmusicianstocreatehitsongs. B.Peoplelistentomusiconit. C.ItwascreatedbyDrKomarovaandhercolleagues. D.Ithelpscollectandanalyzeinformationaboutmusic. 3Accordingtothepassagewhichofthefollowingistrueabouttop﹣chartsongs? A.Theyareusuallymorerelaxingthanothersongs. B.Danceableandparty﹣likemusicprobablymakesittothetop. C.Theyaremuchmorelikelytobesungbymen. D.Theyareusuallyhappierandbrighterthanothers. 4Thepassageindicatesthat. A.MusiciansalreadybenefitfromtheresultofDrKomarova'sresearch B.4%ofthesongsaretotallyrandompicksinDrKomarova'sresearch. C.ThesecretofhitsongshasnowbeenfoundaccordingtoDrKomarova D.HitsongsarepartlypredictablebythemachineinventedbyDrKomarova
Theworld'sfirstelectricdriverlessheavytruckissaidtobethantraditionalones. A.tentimesmoresafer B.morethantentimessafer C.morethantentimesassafe D.tenmoretimesassafe
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