A、spECiAl rEsEArCh tEAm From thE loCAl mEDiCAl CEntEr76 ExpErimEnts ComplEtEly BlinD BABiEs. ThE BABiEs to BE tEstED on livED At homE with thEir mothErs or FAmiliEs. ThE rEsEArCh workErs woulD visit thE BABiEs AnD ClosEly77 thE DEvElopmEnt oF thEir sEnsEs AnD BEhAvior EvEry two wEEks.In most78, thE rEsEArCh workErs tEstED thE rEsponsEs oF thE BlinD BABiEs to DiFFErEnt stimuli79 BABy woulD rEACt with smilEs AnD lAughtEr to tiCkling , to thE voiCE oF A rElAtivE, AnD to hugging From his FAmily. His rEACtions wErE swiFt. 80 most oF thE BlinD BABiEs, ACCorDing to thE ExpErimEnts, rEsponDED to stimuli impAssivEly. In FACt, thEy wErE inDiFFErEnt to 81sounD、But82 somE spECiAl situAtions, somE oF thEm wErE ABlE to 83 to thE sounD oF thEir mothErs with A smilE. UsuAlly, thEir rEsponsE wAs vEry 84ThE tEsts wErE DonE ABout ninE months; thEy85 whEn thE BlinD BABiEs wErE onE month olD AnD EnDED whEn thEy wErE tEn months olD、
A、CArriED
B、DiD
C．FinishED
D．took