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【单选题】

If arbitrage ensures that any three currencies are freely convertible in competitive markets, then:_________如果套利确保在竞争市场中任意三种货币均可自由兑换,则:_________

A.
it is enough to know only one exchange rate to determine the third     (只知道一个汇率就可以确定第三个汇率)
B.
we can estimate two exchange rates based on one exchange rate only (我们只能根据一种汇率估算两种汇率)
C.
it is necessary to know all three rates  (有必要了解全部三个比率)
D.
it is enough to know the exchange rates between any two in order to determine the third (知道任意两个之间的汇率就足以确定第三个)
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参考解析:
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举一反三

【单选题】一国货币可自由兑换是指

A.
该货币可自由兑换为另一国的货币
B.
该货币可自由兑换为黄金
C.
该货币可自由出入国境
D.
上述说法都不对

【单选题】垄断竞争市场就是()的市场。

A.
垄断压制了竞争的市场
B.
又有垄断又有竞争的市场
C.
竞争打破了垄断的市场
D.
完全被一家垄断的市场