— Excuse me,   could you tell me where I could make a call?

— Sorry,   I'm a stranger here.

— ________. [ ]

A. Thanks a lot  

B. That's a pity

C. Thanks anyway  

D. I'm sorry to hear that

最常用描述正态分布资料离散趋势的指标是（）

A.极差

B.标准差

C.中位数

D.几何均数

E.算术平均数