(2013·天津高考)—Mary's been offered a job in a university, but she doesn't want to take it.

—________？ It's a very good chance.

A．Guess what

B．So what

C．Who cares

D．But why

某研究者收集了200例某恶性肿瘤术后的随访数据，并将其整理成分组资料，现欲汁算生存率，可选择

A．确切概率法
B．乘积极限法
C．寿命表法
D．最小二乘法
E．正态近似法