Internet网中某一主机域名为：lab.scut.edu.cn，其中最低级域名为（）

A:lab B:scut C:edu D:cn

（　） before you leave the lab.

A:Make sure that the windows are shut B:To make sure that the windows are shut C:Making sure to shut the windows D:To be sure to shut the windows

______ before you leave the lab.

A:Make sure that the windows are shut B:To make sure that the windows are shut C:Making sure to shut the windows D:To be sure to shut the windows

______ before you leave the lab.

A:Make sure that the windows are shut B:To make sure that the windows are shut C:Making sure to shut the windows D:To be sure to shut the windows

Internet 网中某一主机域名为： lab.scut.edu.cn，其中最低级域 名为 （ ）。

A:lab B:scut C:edu D:cn

Internet 网中某一主机域名为： lab.scut.edu.cn，其中最低级域名为 （ ）。

A:laB B:scut C:edu D:cn