It ________ me that I could buy the admission ticket of the exhibition at the discount of 50% with my student card, ________ made me extremely excited.

A．happened to; that

B．occurred to; it

C．happened to; which

D．occurred to; which

在机体的生命活动中，自始至终都进行着新陈代谢，新陈代谢是指(*

A．合成代谢

B．食物代谢

C．分解代谢

D．合成代谢和分解代谢