listEning 2 "gEologyClAss"
{$mEDiAurl}




how DoEs thE proFEssor introDuCE thE DEnDritiC DrAinAgE systEm
A、By DEmonstrAting how this vEry olD systEm hAs EvolvED
B、By CompAring it to Both A trEE AnD thE humAn CirCulAtory systEm
C、By CritiCizing thE EFFiCiEnCy oF thE BrAnChEs in thE systEm
D、By DrAwing ConClusions ABout thE ClimAtE in thE ArEA