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  3. Money is used for buying or selling goods, for measuring value and for storing wealth. However, in primitive societies a system

Money is used for buying or selling goods, for measuring value and for storing wealth. However, in primitive societies a system

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问题     Money is used for buying or selling goods, for measuring value and for storing wealth. However, in primitive societies a system of barter was used. Barter was a system of direct exchange of goods. Somebody could exchange a sheep, for example, for anything in the market place that he or she considered to be of equal value. Barter, however, was a very unsatisfactory system of exchange, and various money systems developed based on goods that the members of society recognized as having value. Cattle, grain, teeth, shells, salt, and tobacco had all been used. Precious metals gradually took over because, when made into coins, they were portable, durable, recognizable, and divisible into larger and smaller units of value.
    A coin is a piece of metal, usually disc-shaped, which bears lettering, designs or numbers showing its value. Until the eighteenth and nineteenth centuries, coins were given monetary worth based on the exact amount of metal contained in them, but most modern coins are based on face value—the value that the governments choose to give them, which doesn’t show the actual metal content. Coins have been made of gold, silver, copper, plastic and in China even from tea leaves. Most governments now issue paper money in the form of bills, which are really "promises to pay". Paper money is obviously easier to handle and much more convenient in the modern world. Checks and credit cards are being used increasingly, and it is possible to imagine a world where "money" in the form of coins and paper currency will no longer be used. Even today, in the United States, many places, especially filling stations will not accept cash at night for security reasons.
"Promises to pay" (Paragraph 2) means______.
选项 A、possibilities to pay
B、necessities to pay
C、obligations to pay
D、opportunities to pay
答案C
解析 词语理解题。由第二段第四句话可知，政府印制的纸币虽然本身不含价值，但是作为货币的一种形式，代表着一定的价值。obligation意思是“义务、职责”，和promise是同义词。故选C。
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