月球上有一座环形山，是以我国古代哪位科学家的名字命名的[ ]
A．贾思勰
B．祖冲之
C．郦道元
D．张衡
答案：B
What a surprise! I _____ you _____ here in Wuxi. [ ]
A. don't know, are
B. don't know, were
C. didn't know, were
D. didn't know, are
溶血反应主要是用来检测（）.
A.总补体活性
B.溶血性疾病的不完全抗体
C.红细胞的脆性
D.待测抗原或抗体
E.溶血素滴度
