— What do you mean by saying every minute counts?

— I just mean that every minute must be made full use of ______ for the final examination. [ ]

A. prepare        

B. prepared      

C. preparing    

D. to prepare

张女士，35岁，患原发性甲状腺功能亢进。入院后在清晨未起床前测病人脉率 110/min，血压140/80mmHg，拟在服用复方碘化钾溶液等术前准备后，择期行甲状腺大部切除术。

按简便公式计算，该病人的基础代谢率 (BMR)为( )。

A．50%

B．59%

C．109%

D．139%

E．170%