经济联盟的成员国不仅要在税收、政府开支、产业策略等方面保持一致，而且还应使用统一的货币。

经济联盟的成员国不仅要在税收、政府开支、产业策略等方面保持一致，而且还应使用统一的货币。
【正确答案】：The members of an Economic Union are required not only to harmonize their taxation, government expenditure, industry policies, etc. , but also use the same currency.