{{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.