May I have you attention please? I have few things to tell you. When you have class here in the language lab, please be here a little early. Change your shoes before enter the lab. Don’t bring anything here except your text books. When you are into, please don’t touch these machine without permission. Always do as the teacher tell you to. In class you should only speak the English, not Chinese. Recorders can be used make a copy of the listening materials. When class over, turn off your machines and leave the lab one by one.

That’s all. Thank you.

菜单项旁有三角形表示（）。

A、此菜单还有若干子菜单

B、表示该命令正在起作用

C、选择此命令后会出现对话框

D、表示此命令当前不可选用