The visitors here are greatly impressed by the fact that________people from all walks of life are working hard for________new Jiangsu.                            (2010·江苏，21)

A．/；a

B．/；the

C．the；a

D．the；the

足月自然分娩，婴儿重4000克，胎盘娩出后出血400ml，最可能的出血原因是（）。

A.使用镇静剂

B.产妇疲乏

C.巨大儿

D.羊水过多

E.子宫肌瘤