--- ____ your classmates play games after school?  

--- Yes, _____ .[ ]

A. Is, he is      

B. Are, they are      

C. Do, they do    

D. Does, they does

超级用户root当前所在目录为：/usr/local，键入cd命令后，用户当前所在目录为（）。

A.home

B./root

C.home/root

D.usr/local