NO.PZ2016010801000122
问题如下：
The difference between economic union and common market is that:
选项：
A.
There is no barriers to labor movement among members in economic union.
B.
Common economic policy is established among members in economic union.
C.
In economic union, members use the same currency.
解释：
B is correct. Apart from advantages in common market, economic union further establishes common economic policy among members. Monetary union adopt the single currency.
考点：Trading Blocs, Common Markets and Economic Unions
解析：经济联盟除了在共同市场上具有优势外，还进一步在成员之间建立共同的经济政策。B选项正确。
注意到是货币联盟而不是经济联盟采用单一货币。
1.采用同一种货币的组织叫currency union ，currency union 是一个单独的概念吗？还是包含于economic union （一个子集）？
2.如果currency union 属于economic union ，那么不选C的原因是否因为采用同一种货币的组织一定属于economic union，但是economic union不一定属于currency union?（可能是因为除货币以外的其他经济政策统一而成为economic union）
