Thebabyisjustonedayoldandhasnotyetlefthospital.Sheisquietbutalert(警觉).Twentycentimetersfromherfaceresearchershaveplacedawhitecardwithtwoblackspotsonit.Shestaresatitcarefully.Aresearcherremovesthecardandreplacesitbyanotherthistimewiththespotsdifferentlyspaced.Asthecardschangefromonetotheotherhergaze(凝视)startstoloseitsfocus--untilathirdwiththreeblackspotsispresented.Hergazereturns:shelooksatitfortwiceaslongasshedidatthepreviouscard.Canshetellthatthenumbertwoisdifferentfromthreejust24hoursaftercomingintotheworld?
Ordonewbornssimplyprefermoretofewer?Thesameexperimentbutwiththreespotsshownbeforetwoshowsthesamereturnofinterestwhenthenumberofspotschanges.Perhapsitisjustthenewness?Whenslightlyolderbabieswereshowncardswithpicturesofobjects(acombakeyanorangeandsoon)changingthenumberofobjectshadaneffectseparatefromchangingtheobjectsthemselves.Coulditbethepatternthattwothingsmakeasopposedtothree?Noagain.Babiespaidmoreattentiontosquaresmovingrandomlyonascreenwhentheirnumberchangedfromtwotothreeorthreetotwo.Theeffectevencrossesbetweensenses.Babieswhowererepeatedlyshowntwospotsbecamemoreexcitedwhentheythenheardthreedrumbeatsthanwhentheyheardjusttwo;likewise(同样地)whentheresearchersstartedwithdrumbeatsandmovedtospots.
33.Babiesaresensitivetothechangein_______.
A.thesizeofcards
B.thecolourofpictures
C.theshapeofpatterns
D.thenumberofobjects
34.Whydidtheresearcherstestthebabieswithdrumbeats?
A.Toreducethedifficultyoftheexperiment
B.Toseehowbabiesrecognizesounds
C.Tocarrytheirexperimentfurther
D.Tokeepthebabesinterest.
35.Wheredoesthistextprobablycomefrom?
A.Sciencefiction
B.Children’sliterature
C.Anadvertisement
D.Asciencereport