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

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热门试题

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

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