下列WindowListener接口方法中当窗口被激活时调用的方法是( )。

A．windowActivated(WindowEven

B．windowClosed(WindowEven

C．windowOpened(WindowEven

D．windowDeactivated(WindowEven

对植物群落的结构和环境形成起主导作用的物种是 ( )

A．稀有种

B．伴生种

C．优势种

D．亚优势种