March 5 marks the 50^th anniversary of the “learning from Lei Feng Day”, a day_____ in honor of the Chinese soldier Lei Feng.

A．being named

B．having named

C．named

D．to be named

外源凝血系统和内源凝血系统形成凝血活酶时，都需要下列哪一个凝血因子（）

A.Ⅶ因子

B.Ⅷ因子

C.Ⅹ因子

D.XⅢ因子

E.Ⅲ因子