根据下面内容，回答题：

　　In ancient times wealth was measured and exchanged in things that could be touched: food,tools, and precious metals and stones. Then the barter system was replaced by coins, which still hadreal value since they were pieces of rare metal..Coins were followed by fiat money, paper notes thathave value only because everyone agrees to accept them.

　　Today electronic monetary systems are gradually being introduced that will transform money intoeven less tangible forms, reducing it to a series of "bits and bytes", or units of computerized informa-tion, going between machines at the speed of light. Already, electronic fund transfer allows money tobe instantly sent and received by different banks, companies, and countries through computers andtelecommunications devices.

　　48According to the passage, which of the following was the earliest kind of exchange of wealth?

　　A.Bartered goods.B.Fiat money.C.Coin currency.D.Intangible forms.

　　参考答案：A

　　参考解析：

　　根据文中第一段第一句可知，最早的财富交换形式是物物交换。

　　49The author mentions food, tools and precious metals and stones together because they are all

　　A.useful itemsB.articles of valueC.difficult things to obtainD.material objects

　　参考答案：D

　　参考解析：

　　根据文中第一段第一句中所提到的“things that could be touched...”可知，后面列举的东西都是真实可触及的物体。

　　50According to the passage, coins once had real value as currency because they

　　A.represented a great improvement over barterB.permitted easy transportation of wealthC.were made of precious metalsD.could become collector's items

　　参考答案：C

　　参考解析：

　　根据文中第一段第二句中“since theywere pieces of rare metal”指出，硬币正是因为它们自身的价值因此被用作货币的。

　　51Which of the following statements about computeriz monetary systems is NOT support-ed by the passage?

　　A.They promote international trade.B.They allow very rapid money transfers.C.They are still limited to small transactions(交易 ).D.They are dependent on good telecommunications systems.

　　参考答案：C

　　参考解析：

　　根据文章第二段可知，现代货币系统是电子的，快捷便利，具有相当的规模，不受地域的限制等，可知C项不正确，故选C项。

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