某 Python 程序段如下：
lis=[11,22,33,44,55]
lis[2],lis[3]=lis[3],lis[2]
print(lis)
程序运行后，输出的结果是？（ ）
[11,22,33,44,55]
[11,22,22,33,55]
[11,22,44,33,55]
[11,33,33,44,55]