Life is full of _______.School is thought as the most ­­­_______ obstacle(障碍) in the lives of youth today.

A．challenge; challenging

B．challenges; challenged

C．challenges; challenging

D．challenging; challenges

武警边防部队军人保险基金，包括（）。

A、军人伤亡保险基金

B、军人退役医疗保险基金

C、军人退役养老保险基金

D、未就业随军配偶社会保险基金

E、其他保险基金