根據(jù)下面內(nèi)容，回答題：

　　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.

　　參考答案：A

　　參考解析：

　　根據(jù)文中第一段第一句可知，最早的財富交換形式是物物交換。

　　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

　　參考答案：D

　　參考解析：

　　根據(jù)文中第一段第一句中所提到的“things that could be touched...”可知，后面列舉的東西都是真實可觸及的物體。

　　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

　　參考答案：C

　　參考解析：

　　根據(jù)文中第一段第二句中“since theywere pieces of rare metal”指出，硬幣正是因為它們自身的價值因此被用作貨幣的。

　　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.

　　參考答案：C

　　參考解析：

　　根據(jù)文章第二段可知，現(xiàn)代貨幣系統(tǒng)是電子的，快捷便利，具有相當?shù)囊?guī)模，不受地域的限制等，可知C項不正確，故選C項。

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