【答案解析】People can offer many explanations for the depreciation of the EURO and appreciation of American dollars, which is another aspect of the problem. The explanation about economic gap between EURO-circulation areas and America and relevant interest rate difference is no doubt widely accept- ed. And there is something reasonable in this explanation. What's more important, the lively in- crease of American economy takes most of the people by surprise. But meanwhile, the economy of EUR0-circulation areas is taking on a promising phenomenon. The ECB has succeeded in realizing its first and most important goal--to valorize the price in the EURO-circulation areas.