初产妇的第一产程时间（）
A.2-4小时
B.4-6小时
C.6-8小时
D.9-11小时
E.11-12小时
参考答案：E
Because of Einstein’s Theory of Relativity, scientists never again regarded the world .
A．as before they did
B．as they regarded before
C．as they did before
D．as they had before
医疗废物
