With the adoption of the single European currency euro by most members of the EU，we can say it is well on its way towards the realization of ______.
A、an economic union
B、the common market
C、the Customs Union
D、the European Community
【正确答案】：A
【题目解析】：With the adoption of the single European currency euro by most members of the EU，we can say it is well on its way towards the realization of an economic union.参见教材P36。