Meeting the needs of people and the demands from resources available leads to the basic activity of production. In trying to （65） unlimited wants from limited economic goods, production leads to new problems in economics.
51 A limited B unlimited C exhausted D abundant
52 A concepts B supplies C wants D resources
53 A those B Some C others D many
54 A expression B description C satisfaction D limitation
55 A climbs B extends C grows D raises
56 A always B sometimes C often D never
57 A management B function C board D company
58 A necessities B possibilities C needs D methods
59 A so B GREat C such D such an
60 A form B study C means D source
61 A in time B in practice C in reality D in turn
62 A then B also C for D with
63 A plentiful B scarce C poor D enough
64 A accepted B obtained C offered D discovered
65 A create B depress C restrain D meet
