我国社会保障制度是在战争年代（）的基础上建立起来的。
A.社会保险
B.社会救济
C.供给制
D.济贫制
参考答案：C
It has been announced that candidates remain in their seats until all the papers have been collected.
A．shall
B．can
C．should
D．must
麻醉手术期间低血压的原因。
