医疗机构要变更《医疗机构制剂许可证》许可事项，原审核、批准机关应当自收到申请之日起作出决定的期限为（）

A.5个工作日

B.10个工作日

C.15个工作日

D.20个工作日

E.30个工作日

An investor gathers the following information about three U. S. Treasury annual coupon bonds:

Given the above information, how can the investor generate an arbitrage profit()

A. Purchase bond 1 while selling bonds 2 and 3.

B. Purchase bonds 2 and 3 and selling bond 1.

C. Purchase bonds 1 and 3 while selling bond 2.