Ahandfulofpeoplecanrecallalmosteverydayoftheirlivesinenormousdetail一andafteryearsofresearch，neuroscientistsarefinallybeginningtounderstandhowtheydoit.A)Formostofus,memoryisamessofblurredandfadedpicturesofourlives.Asmuchaswewouldliketoclingontoourpast,eventhesaddestmomentscanbewashedawaywithtime.B)AskNimaVeisehwhathewasdoingforanydayinthepast15years,however,andhewillgiveyouthedetailsoftheweather,whathewaswearing,orevenwhatsideofthetrainhewassittingonhisjourneytowork.'Mymemoryislikealibraryofvideotapes,walk-throughsofeverydayofmylifefromwakingtosleeping,'heexplains.C)Veisehcanevenputadateonwhenthosetapesstartedrecording:15December2000,whenhemethisfirstgirlfriendathisbestfriend's16thbirthdayparty.Hehadalwayshadagoodmemory,butthethrillofyoungloveseemstohaveshiftedagearinhismind:fromnowon,hewouldstartrecordinghiswholelifeindetail.'Icouldtellyoueverythingabouteverydayafterthat.'D)Needlesstosay,peoplelikeVeisehareofgreatinteresttoneuroscientists（神经科学专家）hopingtounderstandthewaythebrainrecordsourlives.Acoupleofrecentpapershavefinallyopenedawindowonthesepeople'sextraordinaryminds.Andsuchresearchmightevensuggestwaysforusalltoreliveourpastwithgreaterclarity.E)'Highlysuperiorautobiographicalmemory'(orHSAMforshort),firstcametolightintheearly2000s,withayoungwomannamedJillPrice.EmailingtheneuroscientistandmemoryresearcherJimMcGaughoneday,sheclaimedthatshecouldrecalleverydayofherlifesincetheageof12.Couldhehelpexplainherexperiences?F)McGaughinvitedhertohislab,andbegantotesther:hewouldgiveheradateandaskhertotellhimabouttheworldeventsonthatday.Truetoherword,shewascorrectalmosteverytime.G)Itdidn'ttakelongformagazinesanddocumentaryfilm-makerstocometounderstandher'totalrecall',andthankstothesubsequentmediainterest,afewdozenothersubjects(includingVeiseh)havesincecomeforwardandcontactedtheteamattheUniversityofCalifornia,Irvine.H)Interestingly,theirmemoriesarehighlyself-centred:althoughtheycanremember'autobiographical'lifeeventsinextraordinarydetail,theyseemtobenobetterthanaverageatrecallingimpersonalinformation,suchasrandom（任意选取的）listsofwords.Noraretheynecessarilybetteratrememberingaroundofdrinks,say.Andalthoughtheirmemoriesarevast,theyarestilllikelytosufferfrom'falsememories'.Clearly,thereisnosuchthingasa'perfect'memory—theirextraordinarymindsarestillusingthesameflawedtoolsthattherestofusrelyon.Thequestionis,how?I)LawrencePatihisattheUniversityofSouthernMississippirecentlystudiedaround20peoplewithHSAMandfoundthattheyscoredparticularlyhighontwomeasures:fantasyproneness(倾向）andabsorption.Fantasypronenesscouldbeconsideredatendencytoimagineanddaydream,whereasabsorptionisthetendencytoallowyourmindtobecomefullyabsorbedinanactivity—topaycompleteattentiontothesensations(感受）andtheexperiences.'I'mextremelysensitivetosounds,smellsandvisualdetail,'explainsNicoleDonohue,whohastakenpartinmanyofthesestudies.'Idefinitelyfeelthingsmorestronglythantheaverageperson.'J)Theabsorptionhelpsthemtoestablishstrongfoundationsforrecollection,saysPatihis,andthefantasypronenessmeansthattheyrevisitthosememoriesagainandagaininthecomingweeksandmonths.Eachtimethisinitialmemorytraceis'replayed',itbecomesevenstronger.Insomeways,youprobablygothroughthatprocessafterabigeventlikeyourweddingday—butthedifferenceisthatthankstotheirotherpsychologicaltendencies,theHSAMsubjectsaredoingitdayin,dayout,forthewholeoftheirlives.K)NoteveryonewithatendencytofantasisewilldevelopHSAM,though,soPatihissuggeststhatsomethingmusthavecausedthemtothinksomuchabouttheirpast.'Maybesomeexperienceintheirchildhoodmeantthattheybecameobsessed(着迷）withcalendarsandwhathappenedtothem,'saysPatihis.L)ThepeoplewithHSAMI'veinterviewedwouldcertainlyagreethatitcanbeamixedblessing.Ontheplusside,itallowsyoutorelivethemosttransformativeandenrichingexperiences.Veiseh,forinstance,travelledalotinhisyouth.Inhissparetime,hevisitedthelocalartgalleries,andthepaintingsarenowlodgeddeepinhisautobiographicalmemories.M)'Imaginebeingabletoremembereverypainting,oneverywall,ineverygalleryspace,betweennearly40countries,'hesays.'That'sabigeducationinartbyitself.'Withthiscomprehensiveknowledgeofthehistoryofart,hehassincebecomeaprofessionalpainter.N)Donohue,nowahistoryteacher,agreesthatithelpedduringcertainpartsofhereducation:'IcandefinitelyrememberwhatIlearnedoncertaindaysatschool.Icouldimaginewhattheteacherwassayingorwhatitlookedlikeinthebook.'O)NoteveryonewithHSAMhasexperiencedthesebenefits，however.Viewingthepastinhighdefinitioncanmakeitverydifficulttogetoverpainandregret.'Itcanbeveryhardtoforgetembarrassingmoments,'saysDonohue.'Youfeelthesameemotions—itisjustasraw,justasfresh...Youcan'tturnoffthatstreamofmemories,nomatterhowhardyoutry.'Veisehagrees:'Itislikehavingtheseopenwounds—theyarejustapartofyou,'hesays.P)Thismeanstheyoftenhavetomakeaspecialefforttolaythepasttorest.Bill,forinstance,oftengetspainful'flashbacks',inwhichunwantedmemoriesintrudeintohisconsciousness,butoverallhehaschosentoseeitasthebestwayofavoidingrepeatingthesamemistakes.'Somepeopleareabsorbedinthepastbutnotopentonewmemories,butthat'snotthecaseforme.Ilookforwardtoeachdayandexperiencingsomethingnew.'36.PeoplewithHSAMhavethesamememoryasordinarypeoplewhenitcomestoimpersonalinformation.37.FantasypronenesswillnotnecessarilycausepeopletodevelopHSAM.38.Veisehbegantorememberthedetailsofhiseverydayexperiencesafterhemethisfirstyounglove.39.ManymorepeoplewithHSAMstartedtocontactresearchersduetothemassmedia.40.PeoplewithHSAMoftenhavetomakeeffortstoavoidfocusingonthepast.41.Mostpeopledonothaveclearmemoriesofpastevents.42.HSAMcanbebothacurseandablessing.43.Ayoungwomansoughtexplanationfromabrainscientistwhenshenoticedherunusualmemory.44.SomepeoplewithHSAMfinditveryhardtogetridofunpleasantmemories.45.ArecentstudyofpeoplewithHSAMrevealsthattheyareliabletofantasyandfullabsorptioninanactivity.
Ahandfulofpeoplecanrecallalmosteverydayoftheirlivesinenormousdetail一andafteryearsofresearch，neuroscientistsarefinallybeginningtounderstandhowtheydoit.A)Formostofus,memoryisamessofblurredandfadedpicturesofourlives.Asmuchaswewouldliketoclingontoourpast,eventhesaddestmomentscanbewashedawaywithtime.B)AskNimaVeisehwhathewasdoingforanydayinthepast15years,however,andhewillgiveyouthedetailsoftheweather,whathewaswearing,orevenwhatsideofthetrainhewassittingonhisjourneytowork.'Mymemoryislikealibraryofvideotapes,walk-throughsofeverydayofmylifefromwakingtosleeping,'heexplains.C)Veisehcanevenputadateonwhenthosetapesstartedrecording:15December2000,whenhemethisfirstgirlfriendathisbestfriend's16thbirthdayparty.Hehadalwayshadagoodmemory,butthethrillofyoungloveseemstohaveshiftedagearinhismind:fromnowon,hewouldstartrecordinghiswholelifeindetail.'Icouldtellyoueverythingabouteverydayafterthat.'D)Needlesstosay,peoplelikeVeisehareofgreatinteresttoneuroscientists（神经科学专家）hopingtounderstandthewaythebrainrecordsourlives.Acoupleofrecentpapershavefinallyopenedawindowonthesepeople'sextraordinaryminds.Andsuchresearchmightevensuggestwaysforusalltoreliveourpastwithgreaterclarity.E)'Highlysuperiorautobiographicalmemory'(orHSAMforshort),firstcametolightintheearly2000s,withayoungwomannamedJillPrice.EmailingtheneuroscientistandmemoryresearcherJimMcGaughoneday,sheclaimedthatshecouldrecalleverydayofherlifesincetheageof12.Couldhehelpexplainherexperiences?F)McGaughinvitedhertohislab,andbegantotesther:hewouldgiveheradateandaskhertotellhimabouttheworldeventsonthatday.Truetoherword,shewascorrectalmosteverytime.G)Itdidn'ttakelongformagazinesanddocumentaryfilm-makerstocometounderstandher'totalrecall',andthankstothesubsequentmediainterest,afewdozenothersubjects(includingVeiseh)havesincecomeforwardandcontactedtheteamattheUniversityofCalifornia,Irvine.H)Interestingly,theirmemoriesarehighlyself-centred:althoughtheycanremember'autobiographical'lifeeventsinextraordinarydetail,theyseemtobenobetterthanaverageatrecallingimpersonalinformation,suchasrandom（任意选取的）listsofwords.Noraretheynecessarilybetteratrememberingaroundofdrinks,say.Andalthoughtheirmemoriesarevast,theyarestilllikelytosufferfrom'falsememories'.Clearly,thereisnosuchthingasa'perfect'memory—theirextraordinarymindsarestillusingthesameflawedtoolsthattherestofusrelyon.Thequestionis,how?I)LawrencePatihisattheUniversityofSouthernMississippirecentlystudiedaround20peoplewithHSAMandfoundthattheyscoredparticularlyhighontwomeasures:fantasyproneness(倾向）andabsorption.Fantasypronenesscouldbeconsideredatendencytoimagineanddaydream,whereasabsorptionisthetendencytoallowyourmindtobecomefullyabsorbedinanactivity—topaycompleteattentiontothesensations(感受）andtheexperiences.'I'mextremelysensitivetosounds,smellsandvisualdetail,'explainsNicoleDonohue,whohastakenpartinmanyofthesestudies.'Idefinitelyfeelthingsmorestronglythantheaverageperson.'J)Theabsorptionhelpsthemtoestablishstrongfoundationsforrecollection,saysPatihis,andthefantasypronenessmeansthattheyrevisitthosememoriesagainandagaininthecomingweeksandmonths.Eachtimethisinitialmemorytraceis'replayed',itbecomesevenstronger.Insomeways,youprobablygothroughthatprocessafterabigeventlikeyourweddingday—butthedifferenceisthatthankstotheirotherpsychologicaltendencies,theHSAMsubjectsaredoingitdayin,dayout,forthewholeoftheirlives.K)NoteveryonewithatendencytofantasisewilldevelopHSAM,though,soPatihissuggeststhatsomethingmusthavecausedthemtothinksomuchabouttheirpast.'Maybesomeexperienceintheirchildhoodmeantthattheybecameobsessed(着迷）withcalendarsandwhathappenedtothem,'saysPatihis.L)ThepeoplewithHSAMI'veinterviewedwouldcertainlyagreethatitcanbeamixedblessing.Ontheplusside,itallowsyoutorelivethemosttransformativeandenrichingexperiences.Veiseh,forinstance,travelledalotinhisyouth.Inhissparetime,hevisitedthelocalartgalleries,andthepaintingsarenowlodgeddeepinhisautobiographicalmemories.M)'Imaginebeingabletoremembereverypainting,oneverywall,ineverygalleryspace,betweennearly40countries,'hesays.'That'sabigeducationinartbyitself.'Withthiscomprehensiveknowledgeofthehistoryofart,hehassincebecomeaprofessionalpainter.N)Donohue,nowahistoryteacher,agreesthatithelpedduringcertainpartsofhereducation:'IcandefinitelyrememberwhatIlearnedoncertaindaysatschool.Icouldimaginewhattheteacherwassayingorwhatitlookedlikeinthebook.'O)NoteveryonewithHSAMhasexperiencedthesebenefits，however.Viewingthepastinhighdefinitioncanmakeitverydifficulttogetoverpainandregret.'Itcanbeveryhardtoforgetembarrassingmoments,'saysDonohue.'Youfeelthesameemotions—itisjustasraw,justasfresh...Youcan'tturnoffthatstreamofmemories,nomatterhowhardyoutry.'Veisehagrees:'Itislikehavingtheseopenwounds—theyarejustapartofyou,'hesays.P)Thismeanstheyoftenhavetomakeaspecialefforttolaythepasttorest.Bill,forinstance,oftengetspainful'flashbacks',inwhichunwantedmemoriesintrudeintohisconsciousness,butoverallhehaschosentoseeitasthebestwayofavoidingrepeatingthesamemistakes.'Somepeopleareabsorbedinthepastbutnotopentonewmemories,butthat'snotthecaseforme.Ilookforwardtoeachdayandexperiencingsomethingnew.'36.PeoplewithHSAMhavethesamememoryasordinarypeoplewhenitcomestoimpersonalinformation.37.FantasypronenesswillnotnecessarilycausepeopletodevelopHSAM.38.Veisehbegantorememberthedetailsofhiseverydayexperiencesafterhemethisfirstyounglove.39.ManymorepeoplewithHSAMstartedtocontactresearchersduetothemassmedia.40.PeoplewithHSAMoftenhavetomakeeffortstoavoidfocusingonthepast.41.Mostpeopledonothaveclearmemoriesofpastevents.42.HSAMcanbebothacurseandablessing.43.Ayoungwomansoughtexplanationfromabrainscientistwhenshenoticedherunusualmemory.44.SomepeoplewithHSAMfinditveryhardtogetridofunpleasantmemories.45.ArecentstudyofpeoplewithHSAMrevealsthattheyareliabletofantasyandfullabsorptioninanactivity.
Whichtwowordsareclosestinmeaning?<br/><b>cycle</b><b>，</b><b>hawk</b><b>，</b><b>convey</b><b>，</b><b>extort</b><b>，</b><b>peddle</b><b>，</b><b>summon</b>
Whichtwowordsareclosestinmeaning?<br/><b>cycle</b><b>，</b><b>hawk</b><b>，</b><b>convey</b><b>，</b><b>extort</b><b>，</b><b>peddle</b><b>，</b><b>summon</b>
设A{a,b}，则P(A)×A = ( )。 A: A B: P（A） C: {<Φ,a>,<Φ,b>,<{a},a>,<{a},b>,<{b},a>,<{b},b>,<A,a>,<A,b>} D: {<a,,Φ,>,<b,,Φ,>,<a,{a}>,<b,{a}>,<a,{b}>,<b,{b}>,<a,A>,<b,A>}
设A{a,b}，则P(A)×A = ( )。 A: A B: P（A） C: {<Φ,a>,<Φ,b>,<{a},a>,<{a},b>,<{b},a>,<{b},b>,<A,a>,<A,b>} D: {<a,,Φ,>,<b,,Φ,>,<a,{a}>,<b,{a}>,<a,{b}>,<b,{b}>,<a,A>,<b,A>}
以下哪段代码可以将A,B的值互换（） A: A=A^B; B=A^B;A=A^B B: A= A^B;A=A^B;B=A^B C: B= A^B; B=A^B; A=A^B D: B=A^B; A= A^B; A= A^B
以下哪段代码可以将A,B的值互换（） A: A=A^B; B=A^B;A=A^B B: A= A^B;A=A^B;B=A^B C: B= A^B; B=A^B; A=A^B D: B=A^B; A= A^B; A= A^B
若集合A={a，b}，B={ a，b，{ a，b }}，则（）。 A: A⊆B，且A∈B B: A∈B，且B⊆A C: A⊈B，且A∉B D: A∉B，且A⊈B
若集合A={a，b}，B={ a，b，{ a，b }}，则（）。 A: A⊆B，且A∈B B: A∈B，且B⊆A C: A⊈B，且A∉B D: A∉B，且A⊈B
设论域D={a,b}，与公式[img=504x85]17d6234b6469e12.png[/img]等价的命题公式是（ ） A: (A（a）∧A（b）) → (B（a）∧B（b）) B: (A（a）→B（a）)∨(A（b）→B（b）) C: (A（a）∨A（b）) → (B（a）∨B（b）) D: (A（a）→B（a）)∧(A（b）→B（b）)
设论域D={a,b}，与公式[img=504x85]17d6234b6469e12.png[/img]等价的命题公式是（ ） A: (A（a）∧A（b）) → (B（a）∧B（b）) B: (A（a）→B（a）)∨(A（b）→B（b）) C: (A（a）∨A（b）) → (B（a）∨B（b）) D: (A（a）→B（a）)∧(A（b）→B（b）)
设论域D={a,b},与公式[img=126x21]17da63121bb0ede.png[/img]等价的命题公式是( ) A: (A(a)∧A(b)) → (B(a)∧B(b)) B: (A(a)→B(a))∨(A(b)→B(b)) C: (A(a)∨A(b)) → (B(a)∨B(b)) D: (A(a)→B(a))∧(A(b)→B(b))
设论域D={a,b},与公式[img=126x21]17da63121bb0ede.png[/img]等价的命题公式是( ) A: (A(a)∧A(b)) → (B(a)∧B(b)) B: (A(a)→B(a))∨(A(b)→B(b)) C: (A(a)∨A(b)) → (B(a)∨B(b)) D: (A(a)→B(a))∧(A(b)→B(b))
优学院: <p class="MsoNormal"> <b>一人造地球卫星到地球中心</b><b>O</b><b>的最大距离和最小距离分别是</b><b>R</b><b><sub>A</sub></b><b>和</b><b>R</b><b><sub>B</sub></b><b>．设卫星对应的角动量分别是</b><b>L</b><b><sub>A</sub></b><b>、</b><b>L</b><b><sub>B</sub></b><b>，动能分别是</b><b>E</b><b><sub>KA</sub></b><b>、</b><b>E</b><b><sub>KB</sub></b><b>，则应有</b><b> </b><b> </b><b> [ </b><b> </b><b> ]</b><b><o:p></o:p></b> </p> <p class="MsoNormal"> <b><br> </b> </p>
优学院: <p class="MsoNormal"> <b>一人造地球卫星到地球中心</b><b>O</b><b>的最大距离和最小距离分别是</b><b>R</b><b><sub>A</sub></b><b>和</b><b>R</b><b><sub>B</sub></b><b>．设卫星对应的角动量分别是</b><b>L</b><b><sub>A</sub></b><b>、</b><b>L</b><b><sub>B</sub></b><b>，动能分别是</b><b>E</b><b><sub>KA</sub></b><b>、</b><b>E</b><b><sub>KB</sub></b><b>，则应有</b><b> </b><b> </b><b> [ </b><b> </b><b> ]</b><b><o:p></o:p></b> </p> <p class="MsoNormal"> <b><br> </b> </p>
设个体域D={a，b}与公式∀x A(x)∧∀xB(x) 等价的命题公式是( ) A: (A(a)∧A(b)) ∧(B(a) ∧B(b)) B: (A(a)∨A(b)) ∧(B(a) ∨B(b)) C: (A(a)∧A(b))∨(B(a)∧B(b)) D: (A(a)∨B(a)) ∧(A(b) ∨B(b))
设个体域D={a，b}与公式∀x A(x)∧∀xB(x) 等价的命题公式是( ) A: (A(a)∧A(b)) ∧(B(a) ∧B(b)) B: (A(a)∨A(b)) ∧(B(a) ∨B(b)) C: (A(a)∧A(b))∨(B(a)∧B(b)) D: (A(a)∨B(a)) ∧(A(b) ∨B(b))
设A=ía,bý,B=í1,2,3ý,求:A×B,B×A,A×A,B×B和(A×B)∩( B×A)。
设A=ía,bý,B=í1,2,3ý,求:A×B,B×A,A×A,B×B和(A×B)∩( B×A)。