{{B}}sEt 3Anthropology{{/B}}

why DoEs thE proFEssor sAy this:
A、to illustrAtE thE soCiAl importAnCE oF thE hAllwAy
B．to ExplAin how wAlls DEtErminE who mAy EntEr A room
C．to point out thAt homEs ArE lArgEr thAn in thE pAst
D．to DEsCriBE thE Flow oF trAFFiC in thE typiCAl homE