listEning 3 "gEologyClAss"
{$mEDiAurl}
whAt option is proposED As An AltErnAtivE whEn All oF thE minErAl rEsourCEs in EAsily ACCEssiBlE loCAtions hAvE BEEn DEplEtED
A、ConvErting to nonrEnEwABlE rEsourCEs
B、ConCEntrAting on ConsErvAtion oF thE rEsourCEs
C、DEvEloping synthEtiC rEsourCEs to rEplACE minErAls
D、using nEw tEChnology to sEArCh thE ArEA AgAin