问题如下：
According to the Fisher-Tippett theorem, as the sample size n gets large, the distribution of extremes converges to:
选项：
A.a normal distribution.
B.a uniform distribution.
C.a generalized Pareto distribution.
D.a generalized extreme value distribution.
解释：
D is correct. The Fisher-Tippett theorem says that as the sample size n gets large, the distribution of extremes, denoted Mn , converges to a generalized extreme value (GEV) distribution.
这题说N越大的时候，其实不是本来就是讨论的GEV的情况么（讲义中GEV部分），本来就是GEV分布，N越大了，越“转换成GEV分布”是什么意思？？-。-....
