.

— I ‘ll ask our physics teacher to explain Newton’s Second Law of Motion, which she taught us yesterday.

— That’s just _______ most of the students haven’t understood.

A．what

B．why

C．how

D．where

27岁初孕妇，妊娠38周，枕左前位，胎心140次／分，血压190/120mmHg，尿蛋白3g/24h，骨盆外测量正常。本例恰当处理应是（）

A.积极治疗，等待产程发动

B.积极治疗24~48小时后终止妊娠

C.积极治疗1周后予以引产

D.立即引产

E.立即行剖宫产术