— Could you tell me ______? 

— Of course. He is my good friend Wang Le. [ ]

A. who is the boy in a green T-shirt

B. who the boy in a green T-shirt is

C. who was the boy in a green T-shirt

D. who the boy in a green T-shirt was

用F检验法来判断两个方差时，计算出统计量F值（）查阅F分布表中相应的F值，则两个方差不存在显著性差异。

A.大于等于

B.小于等于

C.等于

D.大于