在统计学中，总体相关系数表示为（）
A.r
B.ρ
C.
D.δ
参考答案：B
---Lucy _________ really quiet but now she is very outgoing.
---Yes. She has changed a lot.
A．use to be
B．used to
C．used to be
D．be used to be
长沙湘江东岸沿江风光带上，有一个为纪念唐代某著名诗人的仿古园林建筑，名称是？
