---Seems no one knows _____ what happened to Malaysia Airline Flight 370.

---It’s really sad, hope more and more resources will be offered in the search.

A．exactly

B．especially

C．hardly

D．quickly

假如进一步检查确诊为肿瘤，下列哪项与预后关系最不密切

A．肿瘤组织类型
B．细胞分化程度
C．有无钙化
D．生长方式
E．浸润深度