It is the fact ______he doesn’t know his own birthday ______surprises us all.

A．which; which

B．that; that

C．which; that

D．that; which

某药半衰期为10小时，一次给药后，药物在体内基本消除的时间为（）

A.10小时左右

B.20小时左右

C.1天左右

D.2天左右

E.5天左右