A short time ago economists divided goods into two categories, free and economic. The former, like air and water, were in 　　　　.(59) abundance that economists had no concern for them. After all, economics is the 　　　　(60) of scarcity (匮乏) and what to do about it. Today many of these free goods are 　　　　(61) very expensive to use. Pollution has made clean air and water expensive for producers who have to filter their waste products, for consumers who ultimately (最终) pay for the producers extra costs, and 　　　　(62) taxpayers who pay for the governments involvement in cleaning the environment.

　　In the 1990s, almost all goods are 　　　　(63). Only by effort and money can they be 　　　　.(64) in the form people wish.

　　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

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