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

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

单项选择题

Until the big gold discoveries in the late nineteenth century ______.

A．most nations adopted the gold standard
B．the trading nations were unable to get enough gold
C．gold coins were used by most nations
D．gold ceased to be an important metal