红细胞膜上的ABH抗原的主要构成物质是（）
A.免疫球蛋白
B.脂蛋白
C.糖蛋白和糖脂
D.磷脂
E.胆固醇
参考答案：C
Nancy hasn't begun working on her P.H.D, _____ working on her master's. [ ]
A. still because she is yet
B. yet as a result she is still
C. yet because she is still
D. still while she is already
如果只考虑接近原料产地，下列城市适宜建毛纺织工业中心的是[ ]
A．湖南长沙
B．江苏南京
C．河南郑州
D．青海西宁
