假设上题中两个测验得分总体不服从正态分布，求两个测验得分之间的相关。

A. 人眼识别频率一般为24H左右,也就是说快于这个频率人眼就能识别出来
B. 人眼识别频率般为24H左右,也就是说慢于这个频率人眼就能识别出来
C. 假设人眼识别频率为25H,那么只要数码管刷新周期大于40ms就可以达到稳定显示的效果
D. 假设人眼识别频率为25H,那么只要数码管刷新周期小于40ms就可以达到稳定显示的效果

A. The American Dreammeans different things to different people.
B. for many, particularly immigrants,it means the opportunity to make a better life for themselves.
C. For ordinary people, it means a happy family, an ideal job, and a nice house.
D. For minorities and immigrants, it also includes freedom and equal rights.