创建一个名为student的新类，保存新类的类库名称是mylib，新类的父类是Person，正确的命令是( )。

A．CREATE CLASS mylib OF student As PerSon

B．CREATE CLASS studem OF Pemon As mylib

C．CREATE CLASS Student OF mylib As PerSon

D．CREATE CLASS Person OF mylib As student

视常见最敏感的部位是

A、黄斑

B、视神经 * *

C、视网膜视部

D、视网膜

E、黄斑中央凹