-- What _____ exciting experience to jump down from _____ bridge of 50 meters high!

-- Oh, I can never imagine that. Bungee jumping is too dangerous, I think.

A．/ ; a

B．an ; the

C．/ ; the

D．an ; a

老张和老李一起参加冬季长跑比赛．同时起跑后，老张用1小时12分钟跑到终点，老李用1小时37分钟跑到终点．老李比老张多用了多长时间？