Liu Xiang had worked hard . ________， he won the first prize in the 28th Olympic Games.

A．As the result

B．As a result

C．As a result of

D．However

远期汇率的期限从1个月到12个月不等，最常用的是1个月和（）的汇率。

A.2个月

B.3个月

C.6个月

D.9个月