it is impliED in thE sEConD pArAgrAph thAt _________.
A．ClEAr Air is nECEssAry For pEoplE's hEAlth
B．wE Don't hAvE to worry ABout FuturE DEvElopmEnts
C．wE shoulD Control ovErExploitAtion oF thE nAturE
D．pEoplE CAn proDuCE morE EnErgy to mEEt inDustriAl DEmAnDs