The highest form of economic integration is called ______ which is characterized by integration of the domestic policies of its members in respect of economy，finance etc. in addition to absence of trade barriers, practice of common external policy and free production factor mobility.
A、Mercosur
B、the Customs Union
C、the common market
D、the economic union
【正确答案】：D
【题目解析】：The highest form of economic integration is called the economic union which is characterized by integration of the domestic policies of its members in respect of economy，finance etc. in addition to absence of trade barriers, practice of common external policy and free production factor mobility.参见教材P36。
