It is known to us that doing exercise _____ our health,and that is to say, ou  health can ____ doing

exercise.     [ ]

A. benefits; benefit from    

B. benefits to; benefit      

C. benefits from; benefit      

D. benefits; be benefited from

Internet是（）类型的网络。

A.局域网

B.城域网

C.广域网

D.企业网