单项选择题

The last paragraph implies that ______________.

A．Americans could use gold as money
B．paper money was once related to gold
C．paper money has no value
D．gold is of no value
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单项选择题
The writer of this passage refers to the history of money in order to ______________.
A．show that silver and gold are previous metals
B．show that one should convert paper money to gold
C．explain the nature of money
D．show that anything can serve as money in modem times
单项选择题
The second paragraph tells the reader that _____________.
A．money has no value
B．money has no intrinsic value
C．there exists a lot of confusion about the nature of money
D．money is worthless
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