一般美元是国际支付中使用较多的货币，各国都把美元当作制定汇率的主要货币，常把对美元的汇率作为基本汇率。( )
参考答案：对
----The clothes I received are not the same as shown online.
-----_________? But I promise we will see to it right away.
A．Who says
B．How come
C．What for
D．Why worry
血管造影的并发症，哪个除外
A．血管内膜剥离B．穿刺部位血肿C．假性动脉瘤D．原发病加重E．血管破裂
