实现了统一的货币：欧元，这表明欧盟 [ ]
A．只有一种货币——欧元
B．经济一体化程度在加深
C．已经变成了联邦制国家
D．成员国的经济水平一致
答案：B
32．Miss Bell joined the search-and-rescue team when she was 14, the youngest age ______ one can be admitted．
A．from which
B．at which
C．that
D．Which
会员制期货交易所的会员都是交易所的创办发起人。( )
