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如图1曲线表示某种生物（2n）的体细胞分裂过程及精子形成过程中每个细胞内某物质数量的变化．a、b、c、d、e分别表示分裂过程中的某几个时期的细胞分裂模式图．请据图回答下列问题： （1）曲线中①～...
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高二下学期生物《》真题及答案
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如下图曲线表示某生物2n＝4的体细胞分裂过程及精子形成过程中每个细胞内某物质数量的变化abcde分别
42.12分下图曲线表示某种生物2n＝4的体细胞分裂过程及精子形成过程中每个细胞内某物质数量的变化a
如图曲线表示某生物2n＝4的体细胞分裂过程及精子形成过程中每个细胞内某物质数量的变化abcde分别表
如图曲线表示某生物2n＝4的体细胞分裂过程及精子形成过程中每个细胞内某物质数量的变化abcde分别表
下图A表示一动物精巢内体细胞分裂及其精子形成过程中DNA数量的变化曲线B表示在细胞分裂过程中的各个时
2011·威海如下图曲线表示某生物2n＝4的体细胞分裂过程及精子形成过程中每个细胞内某物质数量的变化
如图为某种生物的三个处于分裂后期的细胞请根据图回答1该种生物体细胞中的染色体数为______条表示体
图1曲线表示某生物2n=4的体细胞分裂过程及精子形成过程中每个细胞内某物质的变化．abcd分别表示
a﹣﹣⑥
b﹣﹣⑤
c﹣﹣④
d﹣﹣﹣②
如图曲线表示某生物2n＝4的体细胞分裂过程及精子形成过程中每个细胞内某物质数量的变化abcde分别表
下图曲线表示某生物2n＝4的体细胞分裂过程及精子形成过程中染色体数量的变化abcde分别表示分裂过程
下图曲线表示某生物2n＝4的体细胞分裂过程及精子形成过程中染色体数量的变化abcde分别表示分裂过程
下图曲线表示某生物2n＝4的体细胞分裂过程及精子形成过程中染色体数量的变化abcde分别表示分裂过程
下图曲线表示某生物2n＝4的体细胞分裂过程及精子形成过程中染色体数量的变化abcde分别表示分裂过程
如图曲线表示某生物2n＝4的体细胞分裂过程及精子形成过程中每个细胞内某物质数量的变化abcde分别表
下图曲线表示某生物2n＝4的体细胞分裂过程及精子形成过程中染色体数量的变化abcde分别表示分裂过程
41.8分下图曲线表示某种生物2n＝4的体细胞分裂过程及精子形成过程中每个细胞内某物质数量的变化ab
下图曲线表示某生物2n＝4的体细胞分裂过程及精子形成过程中染色体数量的变化abcde分别表示分裂过程
如图曲线表示某生物2n＝4的体细胞分裂过程及精子形成过程中每个细胞内某物质数量的变化abcde分别表
下图A表示一动物精巢内体细胞分裂及其精子形成过程中DNA数量的变化曲线B表示在细胞分裂过程中的各个时
下图曲线表示某生物2n＝4的体细胞分裂过程及精子形成过程中染色体数量的变化abcde分别表示分裂过程
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ConqueringProcrastination拖延症 Procrastinationthehabitofputtingtasksofftothelastpossibleminutecanbeamajorprobleminbothyourcareerandyourpersonallife.1.Thereforeittakesdeliberatestrategiestoavoidbecomingourownworstenemybyprocrastinatingonourintendedactions. Don'tgiveintofeelinggood.2.Forexampleataskathandmakesusfeelanxiousoroverwhelmedsowegiveintofeelinggoodseekingimmediateemotionalreliefandwewalkawayleavingthetaskfortomorrow.Tocopewiththisstayforaminute﹣don'twalkaway.Acknowledgethenegativeemotionsbutgetstartedanyway.Progressonagoalprovidesthemotivationforanotherstepforward. 3.We'remostlikelytoprocrastinateontasksthatlackstructure.Thismeansthatinadditiontomakingyourtaskspecificit'simportanttoreducetheuncertaintyabouthowtocontinue﹣andwhenit'stimetoacttoreduceavailabledistractions分心的事物aswell.Shutoffyoure﹣mailseparateyourselffromothersasmuchasyoucanandmakesuretheenvironmentaroundyouisworkingtostrengthenyourwillpowerandfocusnottoweakenyourefforts. Makethemostofthewillpowermuscle.Agreatdealofrecentresearchclearlyindicatesthatwillpowerislikeamuscle.Youcanexhaustitmorequicklythanyoumightimagineandwhenyoudoyouloseyourabilitytoself﹣regulateyourbehavior.Oneimmediatemethodtostrengthenyourresolveinordertokeepyouontaskistoremindyourselfofyourvalues.4. Beatingprocrastinationisn'trocketsciencebutitispsychology.Procrastinatorscanchangetheirbehavior﹣butdoingsoconsumesalotofmentalenergy.5.Itcanbedonewithhighlyorganizedcognitive认知的behaviortreatment. A.Itssideeffectsincludelosingopportunitiesrushedworkstressangerandguilt. B.Donotperformseveraltasksatatime. C.Thisprocessofself﹣recognitionstrengthensourweakeningwillpower. D.Whenself﹣regulationfailsit'softenbecauseshort﹣termemotionalrepaircomesbeforeourlong﹣termgoals. E.Anditdoesn'tnecessarilymeanonefeelstransformedinternally. F.Itmeansdoingmoreenjoyablethingsinplaceoflessenjoyableones. G.Reduceuncertaintyanddistractions.
除非你保持均衡的饮食否则将会增加体重. Unlessyoukeepadietyouwill.
Heathasbeenusedtocontrolhairforhundredsofyears.Buthowmuchistoomuch?Ifyou'veeveropenedaveryhotovenyouknowthatheatcanburnyoureyebrowsoffyourfaceveryquickly.AscientistfromPurdueUniversityinIndianaistryingtofindascientificansweronhowhotistoohotwhenitcomestoyourhair. Manywomenandsomemenareveryparticularabouttheirhair.Somepeoplewhohavenaturallycurlyhairprefertohaveitstraightened.Otherswithstraighthairwanttohavecurls.TahiraReidisoneofthosepeople.AsanAfrican﹣Americanwomansheisfamiliarwiththechallengesofmaintaining保养curlycoiled缠绕ortightlycurledhair. TahiraReidandotherresearchersatPurdueUniversityarestudyinghowheattreatmentinteractswithdifferenttypesofhairandhowtopreventdamage.AmyMarconnetisassistantprofessor.Shesaystheteamisseeinghowheatandtemperaturerelatestotheirresearch. InaPurdueUniversitylabteammembersdesignedahairstraightenertool﹣﹣aflatironwithtemperaturecontrol.Theyattachedittoaroboticarmthatmovedoverpiecesofhair.Theycontrolledthetemperaturewhilethedevicestraightenedhair. Whatdidtheyfind?Theirstudyfoundthattheheatweakensorbreaksaproteincalledkeratinresponsibleforthehair'sshapeandtemporarilychangesit.Butnobodyknowsexactlywhatlevelcanmaketheheatactuallycauseforeverdamage. Researcherssayearlyresultsareabitinconclusive非决定性的.Itturnsoutthateveryone'shairisdifferentandthatthere'snoexacttemperaturewherehairstraighteningbecomeshairdamage.Ms.Reidsaystheywillcontinuetheirresearchinthehopeoffindingwhatworksbestwithoutdamagingthehair. 1Whatdoesthesciencewanttofindout? A.Waystoprotectourhair. B.Thetemperaturethatcandamagehair. C.Thetemperaturethatmakeshaircurly. D.Waystoprotecteyebrows. 2Theunderlinespartthosepeopleinparagraph2referstothosewho. A.aren'teasilysatisfiedwiththeirhairstyle B.lovetheirhairverymuch C.lovemakingtheirhairlookcurly D.areAfrican﹣American 3Whatdoweknowaboutthehairstraightenertool? A.Itiscontrolledbyarobot. B.Itstemperaturecanbechanged. C.ItwasinventedbyTahiraReidalone. D.Itcancontrolthetemperatureautomatically.
Teachingchildrenwithspecialneedsrequires耐心andunderstanding.
多亏了每一个人的辛勤努力表演取得了巨大的成功. everyone'shardworkthewasagreat.
Hearingthatdecisionsheshookherhead猛烈地激烈地.
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WhenIwassuperintendentofschoolsinPaloAltoCaliforniaPollyTynerthepresidentofourboardoftrustees董事会wrotealetterthatwasprintedinthePaloAltoTimes.Polly'ssonJimhadgreatdifficultyinschool.Hewasclassifiedaseducationallyhandicappedandrequiredagreatdealofpatienceonthepartofhisparentsandteachers.ButJimwasahappykidwithagreatsmilethatlituptheroom.Hisparentsacknowledgedhisacademicdifficultiesbutalwaystriedtohelphimseehisstrengthssothathecouldwalkwithpride.ShortlyafterJimfinishedhighschoolhewaskilledinamotorcycleaccident.Afterhisdeathhismothersubmittedthislettertothenewspaper. Todayweburiedour20﹣year﹣oldson.HewaskilledinstantlyinamotorcycleaccidentonFridaynight.HowIwishIhadknownwhenItalkedtohimlastthatitwouldbethelasttime.IfIhadonlyknownIwouldhavesaidJimIloveyouandI'msoveryproudofyou. Iwouldhavetakenthetimetocountthemanyblessingshebroughttothelivesofthemanywholovedhim.Iwouldhavetakentimetoappreciatehisbeautifulsmilethesoundofhislaughterhisgenuineloveofpeople. Whenyouputallthegoodattributesonthescale天平andyoutrytobalancealltheirritatingtraitssuchastheradiowhichwasalwaystooloudthehaircutthatwasn'ttoourlikingthedirtysocksunderthebedetc.theirritationsdon'tamounttomuch. Iwon'tgetanotherchancetotellmysonallIwouldhavewantedhimtohearbutotherparentsyoudohaveachance.Tellyouryoungpeoplewhatyouwouldwantthemtohearifyouknewitwouldbeyourlastconversation.ThelasttimeItalkedtoJimwasthedayhedied.HecalledmetosayHiMom!IjustcalledtosayIloveyou.Gottogotowork.Bye.Hegavemesomethingtotreasureforever. IfthereisanypurposeatalltoJim'sdeathmaybeitistomakeothersappreciatemoreoflifeandtohavepeopleespeciallyfamiliestakethetimetoleteachotherknowjusthowmuchwecare. Youmayneverhaveanotherchance.Doittoday! 1WhichofthefollowingisNOTtrueaboutJim? A.Hewasaboyhandicappedandneededlotsofpatience. B.Hewasanoptimisticchildandwassincereandkindtoothers. C.Hefoundajobafterhisgraduationfromhighschool. D.Heheldapositiveattitudetolifedespitehisgreatdifficultyinlearning. 2ThelettersubmittedbyJim'smotherisintendedto. A.beinmemoryofhersonwhodiedatanearlyage B.appealtopeopletopayattentiontoroadsafety C.remindpeopletocherishtheirfriendsandfamilies D.showthegreatsorrowwhenparentslosttheirchild 3Theunderlinedwordtraitsinthefourthparagraphprobablymeans. A.portraits B.Qualities C.arguments D.habits 4Thepassageismostprobablyentitled. A.AHeart﹣brokenStory B.MemoriesAboutJim C.GreatParentalLove D.DoItToday
Atsametimetheseactivitiescanhelpustoincreaseself﹣confidence自信.
Thenewteachersoonwonthe尊重ofhisstudents.
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Scientistshavelearnedagreatdealinthelastthirtyyearsbystudyingpeopleastheysleep.Theystudythebodilycharacteristicsthatchangeduringsleep.TheyhavelearnedthatthereisonekindofsleepwhichcausesrapideyemovementREMandanotherkindwithnorapideyemovementNREM. Sleepisdividedintothreestages.Instageonewhenyoustarttogotosleepyouhaveapleasantfloatingfeeling.Instagetwoyousleepmoredeeplyandanoisewillprobablynotwakeyouup.Instagethreethebrainwavesarelessactive.ThisthirdstageiswhenyoudreamREMtendstosignalthatwearedreaming.FortherestofthenightyoualternatebetweenREMandNREMsleep. Sleepisabiologicalneedbutyourbrainneverreallysleeps.Thethingsthatareonyourmindduringthedayarestillthereatnight.Theyappearasdreams.ResearcherssaythatnormalpeoplemayhavefourorfiveREMperiodsofdreamingeachnight.Thefirstonemaybeginonlyahalfhouraftertheyfallasleepandthefinalonemaylastuptoanhour.Nightmaresafrighteningdreamusuallyhappentowardtheearlymorning. Besidesdreamingsnoringisalsocommoninone'ssleep.Peoplesnorebecausetheyhavetroublebreathingwhiletheyareasleep.Somesnorershaveaconditioncalledapnea.Theystopbreathinguptothirtyorfortytimesanhourbecausethethroatmusclesrelaxtoomuchandblocktheairway.Afteraperiodoftimethebrainwillsignalthepersontostartbreathingagain.Duringthistimeapersonwillsnore.Thisisadangerousconditionbecauseoncethebrainiswithoutoxygenforfourminutestherecouldbeseriousbraindamage.Sleepapneacanalsocauseirregularheartbeatshighbloodpressureandagenerallackofenergy. Whatshouldyoudoifyouhavetroublesleeping?Lotsofpeopletakesleepingpillsbutthesearedangerousbecausetheycanbeaddictive.Doctorssaythebestthingistotrytorelaxandtoavoidbadhabits. Sleepisimportanttohumans.Inanaveragelifetime220000hoursarespentsleepingsoweneedtounderstandeverythingwecanaboutsleep.Sweetdreams! 1Sleepisaanneedforhumans. A.emotional B.mental C.biological D.psychological 2WhichofthefollowingconditionsisNOTcausedbysleepapnea? A.Aheartattack. B.Alackofenergy. C.Irregularheartbeats. D.Highbloodpressure. 3Wecanlearnfromthearticlethat. A.ourbrainscangetagoodrestwhenweareasleep B.it'simpossibletostopthehabitoftakingsleepingpills C.REMandNREMarewaystoseeifpeopleareinadeepsleep. D.instagetwopeoplewillprobablynotwakeupiftheyhearanoise. 4Whereisthearticleprobablyfrom? A.Asportsguidebook B.Ahealthmagazine. C.Afashionwebsite. D.Anewsreport.
假设你是高二1班学生李华.英语课上老师请你们以MyDreamJob为题简要介绍自己理想的职业.请你按照以下要点准备发言稿: Whatjobyouwanttodo Whyyouwanttodothejob Whatqualitiesyoushouldhaveforthejob Howyoushouldprepareyourselfforthejob 注意:1.发言稿的开头和结尾已为你写好; 2.词数不少于60. MyDreamJob Goodafternooneveryone. Thankyou!
Mothertoldmethatspendeverysingledaywithsomeonecanbeboring.
Youhaveto钦佩thewayhehandledthesituation.
Idon'tneedhaveapenbecauseIhavealreadygotone.
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IAmaLitterPicker! TwoyearsagoIbecamealitterpicker. AsIwalkeddownthehallonthelastdayoftheschoolyearIwatchedwide﹣eyedasmyfellowstudents1theirlockersintothedustbinsinfrontofthehall.Paperflewinalldirections;brokenshelvesandaluminium铝canswere2everywhere. LookingatthissceneIcameupwithanidea:myschoolreallyneededa3programme. Ibelievedthatonepersoncouldmakea4﹣onepersonwithinitiative主动性5Iwroteoutmyrecyclingplansandonemorninggotapasstotheschoolmaster'soffice.AsItoldheraboutmy6myheartwasbeatingwildly. WithheragreementandencouragementIwould7cardboardboxesinthelibraryofficesandclassroomsto8papersmagazinesandnewspapers.InthediningroomIwouldusefourrubbishbinstocollectplasticbottlesandaluminiumcans. ThatnightIdesignedadozen9andplannedtoarriveatschoolearlytostickthemupandhandout10toclassroomsonMonday. ButwhenIarrivedIwasverydisappointed﹣thenight﹣watchmanhad11downallofthecardboardboxesIhadsaved.IwassoupsetthatIexpressedmyangerthroughoutthedaytoanyonewhowouldlisten.IbegansearchingforotherboxesbutImetwith12success. AfewdayslaterhowevermyEnglishteachertookmeintothenewcomputerlabandbeforemyeyessatamountainofcardboardboxes.IamsureIwasthe13personintheworldwhenIsawtheseboxes.Theseweretheboxesthatthenewcomputershadarrivedinandtheyweretheperfectsize. Irolledmyrecyclingrubbishbinstothediningroomstuckupmypostersand14madeanannouncementovertheloudspeakerlettingthewholeschoolknowtheynowhadachoiceaboutwhatwouldhappentotheirunwantedpaperscansandbottles. Sincethatdayrecyclinghasbecomepartofeverydaylifeatmyschool.Studentsandteachersnowtakeactivestepstoward15theirpaperconsumption消耗tosavetreesandothernaturalresources. 1A.emptied B.opened C.repaired D.pushed 2A.shown B.thrown C.sold D.made 3A.cleaning B.training C.recycling D.developing 4A.difference B.wish C.promise D.mark 5A.since B.but C.while D.so 6A.problems B.ideas C.changes D.decisions 7A.place B.borrow C.return D.examine 8A.buy B.read C.print D.collect 9A.letters B.newspapers C.posters D.envelopes 10A.boxes B.bags C.bottles D.bins 11A.cut B.broken C.dropped D.put 12A.clear B.certain C.limited D.major 13A.cleverest B.happiest C.kindest D.richest 14A.nervously B.patiently C.proudly D.calmly 15A.stopping B.encouraging C.rising D.reducing
下午四点钟你能来机场接我吗?pickup
Mostathletesknowthatgettingenoughrestafterexerciseisimportanttohigh﹣levelperformancebutmanystillovertrainandfeelguiltywhentheytakeadayoff.MycousinTedwasoneofthose.Whenhewasreceivingsomephysicaltraininglastyearinthebeginninghewantedtoperformwellsomuchthathetriedreallyhardleavingnotimeforhisbodytorecoveratall.Asaresulthegotinjuredintheend.Restdaysareimportanttosportsperformanceforavarietyofreasons. Firstrestisphysicallynecessarysothatthemusclescanrepairrebuildandstrengthenthemuscles.Ifyouleavenodaysforyourbodytorecoverduringthetrainingyou'llendupbeinginjuredlikemycousinTed.What'sworsetoofewrestandrecoverydayscanleadtoovertrainingsyndrome综合征﹣adifficultconditiontorecoverfrom. Secondrestdaysnotonlyallowyourbodytorecoverbutalsocanhelpmaintainabetterbalancebetweenlifeandsportsperformancegoals.Ifyoukeeptrainingeverydayyou'llhavelesstimeforotherdailyactivities.Onrestdaysyoucansparetimeforactivitiesyoutrulylove. Thirdrestdayscanmakeyoulessstressedmentally.Ifyoutraineverydayyoumaybeunderalotofmentalstress.Onrestdaysyoucangetrelaxedmentally. Besidesrestdaysgoodsleepatnightisalsoveryimportantforsportsperformance.Ingeneraloneortwonightsofpoororlittlesleepwon'thavemuchimpactonperformancebutalwaysgettinginadequatesleepcanresultinchangesinhormone荷尔蒙levelsespeciallythoserelatedtostressmusclerecoveryandmood. Thereforehigh﹣levelathletesneedtorealizethatthegreaterthetrainingintensityandeffortarethegreatertheneedforplannedrecoveryis.Soincluderestdaysinyourtrainingschedule.Alsosleepwellinordertohelpyourbodyrecoverwell. 1WhatwasTed'sproblem? A.Hetrainedtoohard. B.Hecouldn'tperformwell. C.Hegotinjuredfrequently. D.Hewasgivennorestdays. 2Thefirstreasonwhyrestdaysareimportantisthatthey. A.helpourmusclesrelax B.helpourbodiesrecover C.makeourinjuresheal D.keepusinhealthycondition 3AccordingtoParagraph3restdaysmean. A.bettertraining B.lessmentalstress C.amorebalancedlife D.noovertrainingsyndrome 4WhatdoestheunderlinedwordinadequateinParagraph5probablymean? A.Notinstant. B.Notenough. C.Casual. D.Tiring.
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Wehadan争论争吵withthewaiteraboutthebill.
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Spacetourismisthetermusedtodescribespacetravelforentertainingpurposes.Whatwasonceonlyadream﹣describedinbookssuchasArthurC.Clarke's2001:ASpaceOdyssey﹣isnowbecomingareality. Futurologistsarescientistswhoattempttodeveloppredictionsofwhatlifewillbelikeinthefuture.Afterthefirstmanlandedonthemoonin1969theythoughtthathotelswouldbebuiltonthemoonbytheyear2000.Futurologistsalsoconsideredthepossibilitythatinthe21stcenturyfamiliesmightgoforaholidayonthemoon.Neitherofthesepredictionshascometrueyet﹣buttherapiddevelopmentoftechnologymaymeanthesepredictionsareapossibilityintheyearstocome. SpaceAdventuresiscurrentlytheonlycompanytohavesucceededinsendingpayingpassengersintospace.SpaceAdventuresworkedwiththeFederalSpaceAgencyoftheRussianFederationandRocketandSpaceCorporationEnergiatoofferflightsfortheworld'sfirstprivatespaceexplorers.Eachpersonpaidover﹩20millionfortheir10﹣daytriptotheInternationalSpaceStation. Followingseveralsuccessfulexplorationsintospaceseveralcompaniesarenowconsideringthepossibilityofenablingtouriststovisitspace.InordertomakeitmoreaffordablesuborbitalspacetravelisbeingconsideredbymanycompaniesincludingVirginGalactic.Passengerswouldbetransportedtoaheightofbetween100﹣160kmaboveearthexperience3﹣6minutesofweightlessnessandaviewofthestarsbeforebeingtakenbackdowntoearth.Thisisexpectedtocostaround﹩200000perperson. Whileitcouldbeanenrichingexperiencetherearesomedisadvantagestospacetourism.Manycritics评论家havecommentedthatahugegrowthinthespaceflightindustrycoulddrasticallyspeeduptheprocessofglobalwarming.Inadditionspacetravelisonlyreallyapossibilityforthesuper﹣rich.AlthoughVirginGalacticclaimstobeopeningspacetotherestofustherearestillmillions'ofpeopleworldwidewhowouldn'tbeabletoaffordit. 1Whatarethefuturologists'predictionsabout?不多于8个单词 2Whichcompanyhassucceededinsendingpayingpassengersintospace?不多于2个单词 3Whatisthedisadvantageofspaceflightindustrytotheenvironment?不多于7个单词 4Whatisthearticlemainlyabout?不多于2个单词
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﹣﹣﹣Howdidyouthecompany? ﹣﹣﹣Itusedtobemyfather.Hegaveittomeafterhisretirement. A.takepossessionof;inpossessionof B.takethepossessionof;inthepossessionof C.takepossessionof;inthepossessionof D.takethepossessionof;inpossessionof
ItwasinOctober.Iwas1wanderingdownthestreetheadingintoamostgloriouslybeautifulsunset.Ihadaan2tospeaktosomeoneonthestreettosharethatbeautybutitseemedeveryonewasinahurry. Itookthenext﹣best3.QuicklyIduckedintoa4andaskedtheladybehindthecounterifshecouldcomeoutsideforjustaminute.ShelookedatmeasthoughIwerefromsomeother5.She6andthenseeminglyagainstherbetterjudgmentshemovedtowardthedoor. WhenshegotoutsideIsaidtoherJustlookatthatsunset!NobodyoutherewaslookingatitandIjusthadto7itwithsomeone. Forafewsecondswejust8.ThenIsaidGodisinhisheavenandallisrightwiththeworld.Ithankedherforcomingouttoseeit.Itfelt9tosharethebeauty. Fouryearslatermy10changedgreatly.Icametotheendofatwenty﹣yearmarriage.Iwas11andonmyownforthefirsttimeinmylife.IlivedinatrailerparkandIhadtodomy12inthecommunitylaundryroom. OnedaywhilemyclothesweregoingaroundI13amagazineandreadanarticleaboutawomanwhohadbeenin14circumstances.Shehadcometotheendofamarriagemovedtoa15communityandtheonlyjobshecouldfindwasoneshe16:clothingsalesinastore. Thensomethingthathappenedtoher17everything.Shesaidawomancameintoherstoreandaskedherto18outsidetolookatasunset.ThestrangerhadsaidGodisinhisheavenandallisrightwiththeworldandshehadrealizedthe19inthatstatement.Fromthatmomentonsheturnedher20around. 1A.quickly B.nervously C.aimlessly D.carefully 2A.idea B.urge C.feeling D.chance 3A.action B.way C.decision D.route 4A.store B.restaurant C.hotel D.bank 5A.place B.country C.planet D.city 6A.regretted B.agreed C.refused D.hesitated 7A.discuss B.share C.experience D.study 8A.talked B.wondered C.stood D.looked 9A.safe B.strange C.comfortable D.good 10A.situation B.behaviour C.role D.opinion 11A.depressed B.alone C.excited D.bored 12A.work B.shopping C.wash D.clothes 13A.pickedoff B.pickedout C.pickedover D.pickedup 14A.similar B.different C.favourable D.special 15A.large B.strange C.local D.good 16A.enjoyed B.knew C.disliked D.created 17A.changed B.brought C.destroyed D.settled 18A.play B.wait C.step D.sit 19A.fact B.importance C.advantage D.truth 20A.habit B.state C.job D.life
IfyouaresendingatextwatchingtheTVorlisteningtotheradioyoumaywanttostopandgivethisyourfullattention.Multi﹣taskingshrinks萎缩thebrainresearchsuggests. Astudyfoundthatmenandwomenwhofrequentlyusedseveraltypesoftechnologyatthesametimehadlessgreymatterinakeypartofthebrain.UniversityofSussexresearcherssaidSimultaneouslyusingmobilephoneslaptopsandothermediadevicescouldbechangingthestructureofourbrains. Thefindingfollowsresearchwhichhaslinkedmulti﹣taskingwithashortenedattentionspandepressionanxietyandlowergradesatschool.Theresearchersbeganbyasking75healthymenandwomenhowoftentheydividedtheirattentionbetweendifferenttypesoftechnology.ThiscouldmeansendingatextmessagewhilelisteningtomusicandcheckingemailorspeakingonthephonewhilewatchingTVandsurfingtheweb.ThevolunteerswerethengivenbrainscanswhichshowedtheyhadlessgreymatterinaregioncalledtheanteriorcingulatecortexACC.Thefindingsheldevenwhendifferencesinpersonalityweretakenintoaccount. ThestudypublishedinthejournalPLOSONEisthefirsttomakealinkbetweenmulti﹣taskingandthestructureofthebrain. ResearcherKepKeeLohsaidMediamulti﹣taskingisbecomingmorecommoninourlivestodayandthereisincreasingconcernaboutitsimpactsonourcognitionandsocial﹣emotionalwell﹣being. Headdedthatmoreresearchisneededtoprovethatmulti﹣taskingshrinksthebrain.ThisisbecauseitisalsopossiblethatpeoplewithlessgreymatterintheACCaremoredrawntousinglotsofsmalldevicessimultaneously. Scientistshavepreviouslydemonstratedbrainstructurecanbechangedonprolongedexposuretonewenvironmentsandexperience.Otherstudieshaveshownthattraining﹣suchaslearningtojuggleortaxidriverslearningthemapofLondon﹣canincreasegrey﹣matterdensities密度incertainparts.Expertshavealsowarnedoftheharmfulimpacttechnologycanhaveonourmemoryandattentionspan. 1AccordingtoKepKeeLoh. A.thelinkbetweenmulti﹣taskingandbrainshrinkageneedsfurtherresearch B.peoplewithlessgreymatterintheACCaremoreattractedtomulti﹣tasking C.multi﹣taskinghasharmfulimpactsonourcognitionandsocial﹣emotionalwell﹣being D.multi﹣taskingleadstoashortenedattentionspandepressionanxietyandlowergrades 2WhichofthefollowingisNOTmentionedinthepassage? A.Whatmulti﹣taskingisprobablylinkedwith. B.Howresearchersdrawinferencesaboutmulti﹣tasking. C.Howdifferenthealthconditionsaffectbrainstructure. D.SignificanceandlimitsoftheresearchfromUniversityofSussex. 3Thepurposeofthepassageisto. A.comparethelatestresearchwithpreviousones B.provethedangersofmulti﹣tasking C.informreadersofresearchonmulti﹣tasking D.discussthebenefitsandproblemsofmulti﹣tasking
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