-Dick gave me a note while I __________ in the library.

-I guess he made it to say "Sorry" to you.[ ]

A. am reading

B. was reading

C. reads

D. will read

单因素方差分析中，能成立的公式为

A．SS_总=SS_组内+SS_误差
B．SS_总=SS_组内+SS_组间
C．MS_总=MS_组内+MS_误差
D．MS_总=MS_组内+MS_组间
E．SS_总=SS_处理+SS_配伍