题海让大学四年没有难题
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单选题 The theory of purchasing-power parity does not always hold in practice because

A. many goods are not easily traded across borders

B. tradable goods are not always perfect substitutes when they are produced in different countries

C. real exchange rates fluctuate over time

D. both 1 and 2 are correct

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时间:2026-03-10 16:47:11

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