{{B}}quEstions 29 to 31 ArE BAsED on thE pAssAgE you hAvE just hEArD、{{/B}}
A.humAn BrAins DiFFEr ConsiDErABly. B.thE BrAin A pErson is Born with is importAnt in DEtErmining his intElligEnCE. C.An EnvironmEntAlly hAnDiCAppED pErson won’t AttAin his DuE lEvEl oF intElligEnCE. D.EnvironmEnt is importAnt in DEtErmining A pErson’s intElligEnCE.