本例的诊断应是
A．胎盘早剥
B．胎盘边缘血窦破裂
C．前置胎盘
D．凝血功能障碍
E．以上都不是
参考答案：C
— _____
—Go down this street to the end.
A．Where are we now?
B．What are we doing at the market?
C．How can I get to the market?
D．Who can get to the market?
选择材料时应遵循的原则（）。
A、必要而充分
B、真实而准确
C、典型而新颖
