— Dad,can I surf the Internet?

—Again?I wish that you _____going online _____your health. 

A．know;will do harm to

B．knew;are doing harm to

C．know;have done harm to

D．knew;were doing harm to

市场经济对教师职业道德（）。

A.没有消极影响

B.有消极影响和积极影响

C.只有消极影响