thE pAssAgE mAinly DisCussEs ABout ______.
A．how CulturAl survivAl, inC. hElpED A triBE to solvE thE proBlEm oF CoppEr mining
B．why loCAl CulturEs shoulD BE sAvED
C．thE work oF CulturAl survivAl, inC
D．thE DiFFiCultiEs in sAving loCAl CulturEs