- How often do you play football?

- _______, but usually twice a week.[ ]

A. It all depends

B. Have no idea

C. As usual

D. In fact

患者，女，25岁。初产妇，枕先露，规律性宫缩8小时，开始保护会阴的时间应是（）

A.宫口开全时

B.胎头可以见到时

C.胎头拨露使阴唇后联合紧张时

D.胎头着冠时

E.胎头复位时