----Which subject do you like better, math or physics?

---- I prefer _______ math ________ physics.

A．to learn , to learn

B．learning , to learning

C．learn , than learn

D．to learn , than learn

生物活性强的药品含量测定应首选

A．色谱法

B．UV

C．容量分析法

D．酶分析法

E．生物检定法