单项选择题

The gold standard is ______.

A．the average price of gold on the world market
B．a basis for determining the value of currency
C．the amount of gold required by a nation before its currency can be made convertible
D．a means of determining the quality of gold

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单项选择题

We can easily conclude that ______.

A．gold is not as expensive to mine as other metals
B．one trusts gold more than paper money
C．gold is the easier metal to work with
D．gold is the first metal used to determine the value of currency

单项选择题

Throughout history gold ______.

A．has played an important role in the world economy
B．has set the standard by which all other forms of money are valued
C．has brought out the worst in the human character
D．has been extremely difficult to find