What’re the most industrially important polymeric materials?

A new town has grown up in this ___________ district. A: industrially B: industry C: industrial D: industries

The problem of "scarcity" applies A: only in industrially developed countries because resources are scarce in these countries. B: only in underdeveloped countries because there are few productive resources in these countries. C: only in economic systems that are just beginning to develop because specialized resources are scarce. D: to all economic systems, regardless of their level of development.