AFtEr rEADing this pAssAgE, you CAn ConCluDE thAt ______.
A、mountAin BuilDing is A rArE oCCurrEnCE
B．mountAin BuilDing is going on All thE timE
C．mAny pEoplE DiE in EArthquAkEs EvEry yEAr
D．mountAin ClimBing is An ExCEllEnt ExtrEmE ACtivity