Joe won the first prize on Sunday and, tears rolling down his cheeks,           it a turning point for him. [      ]

A. called  

B. calling  

C. having called

D. to call

表示体内有活的结核菌存在的是（）

A.硬结直径小于5mm

B.硬结直径为5～10mm

C.1岁婴儿，硬结直径为10～20mm

D.硬结直径5～10mm，2～3天消失

E.硬结直径20mm以上，7天未退关于结核菌素试验的诊断