系统性红斑狼疮发病不相关的因素是（）。
A.遗传因素
B.感染因素
C.内分泌因素
D.紫外线照射
E.营养缺乏
参考答案：E
迄今为止在我国发现的面积最大的一座地下宫殿是______，它是西汉第六代楚襄王刘注夫妻的合葬墓。
______no friction between the surface of the road and our feet, we could not walk at all.
A．If there was B．Were there C．Was there D．There was
