How much do you think that vase _____?
A.is cost
B.used
C.was paid for
D.cost
答案:D
叶酸和维生素B12缺乏常引起()
A.缺铁性贫血
B.再生障碍性贫血
C.失血性贫血
D.巨幼红细胞性贫血
E.溶血性贫血
简述物质关系对人际关系的影响?