They happen to be of _____ age, and they all go in for _____ American football. [ ]

A. the same ;the

B. /;/

C. an ; /

D. an ;the

黄体功能不全可出现：（）

A.月经间隔时间正常，但经期延长9～10天，量多 

B.月经周期紊乱，经期长短不一，出血时多，时少 

C.月经周期缩短，月经频发 

D.月经周期正常，量多 

E.月经中期出血，量少