{{i}}quEstions 18 to 20 ArE BAsED on thE Following pAssAgE.At thE EnD oF thE pAssAgE, you will BE givEn 15 sEConDs to AnswEr thE quEstions. now, listEn to thE pAssAgE.{{/i}}

whAt is mAn’s intElligEnCE DECiDED ByA、lArgE BrAin,
B．A、smAll BrAin.
C．thE EnvironmEnt.
D．not prECisEly mEntionED hErE.