____ makes the school famous is _______ more than 90% of the students have been admitted to

universities.[      ]

A. Which, that      

B. That, /        

C. It, because      

D. What, that

借助先进的实验仪器和方法，可测定有机化学分子结构和有机化学反应历程，下列实验方法主要用于测定有机化学反应历程的是 [ ]

A．同位素示踪法

B．核磁共振法

C．红外光谱法

D．质谱法