–Do you think they have as many books as they’ve described?

--Well, in my opinion, they have few books, if ______.

A．some

B．none

C．any

D．many

患者，女，25岁，初产妇，子痫前期，水肿(+++)，硫酸镁解痉及利尿药治疗一周后，足月自娩一女婴，体重3000g，产时出血200ml，产后10分钟突然脸色苍白，血压9.3/6.7kPa(70/50mmHg)，脉搏120次/分。最可能的诊断是

A．仰卧位低血压综合征
B．产后虚脱
C．失血性休克
D．羊水栓塞
E．心力衰竭