Seeing the happy ________ of children playing in the park，I'm full of joy and confidence in

the future of our country.[ ]

A．sight  

B．scene  

C．view  

D．sign

剖宫产术的禁忌证是（）。

A.胎盘早剥

B.部分性前置胎盘

C.头盆不称

D.死胎

E.胎儿宫内窘迫