新民主主义社会不是一个独立的社会形态，它本身具有（）
A.复杂性
B.过渡性
C.混合性
D.短暂性
参考答案：B
________you were coming，I would have stayed at home.
A．If I know
B．Should I know
C．Had I known
D．If I should have known
脊椎椎弓裂以何部位最常见（）
A.腰骶椎
B.胸椎
C.颈椎
D.胸腰椎
E.尾椎
