— Sally got a high position in our company.  

— Really? _____ made her stand out from so many people?[ ]

A. What it was that

B. That was it what

C. What was it that

D. That it was what

比较身高和体重的变异程度可用（）.

A.变异系数

B.方差

C.标准差

D.标准误

E.全距