______ is formed by Argentina, Brazil, Paraguay and Uruguay in 1

______ is formed by Argentina, Brazil, Paraguay and Uruguay in 1991.
A、Mercosur
B、the Customs Union
C、the common market
D、the commodity cartel
【正确答案】：A
【题目解析】：Mercosur (Southern Cone Customs Union) is formed by Argentina, Brazil, Paraguay and Uruguay in 1991.参见教材P36。