— ________?

— Wonderful. It's years since I enjoyed myself so much.  [ ]

A. Did you go to the party

B. What was the party like

C. Is it wonderful

D. Do you like the party

衍生金融工具最原始的作用是（）。

A．价格发现

B．风险转移

C．投机获利

D．资源优化配置