— Oh dear! I've just broken a window. 

— _____. It can't be helped.[ ]

A. Never mind

B. All right

C. that's fine

D. Not at all

超声评价子宫-胎盘循环最常检测的血管是（）。

A.胎儿主动脉

B.胎儿肾动脉

C.母体子宫动脉

D.脐带内脐动脉

E.脐带内脐静脉