All of us went to the movies ______ John. He had to look after his sick mother.

A．except

B．beside

C．with

D．besides

向程序的缓冲区（堆、栈等）中写入超出其长度的数据是（）攻击手段。

A.缓冲区溢出

B.端口扫描

C.SQL注入

D.木马植入