英语部分练专项练习（五）Part I ReadingPassage OneQuestions 1 to 5 are based on the following passage:There are three basic ways in which individual economic units interact with one another. They are the market system, the administered system, and the traditional system.In a market system, individual economic units are free to interact among each other in the market place. Transactions may take place through barter or money exchange. In a barter economy,real goods such as automobiles, shoes, a
