It is important to have your eyes examined regularly to check for any sign of eye disease that may not have any ________.                                      (2012·湖北，29)

A．symptom

B．similarity

C．sample

D．shadow

当事人申请调解，应当自知道或应当知道其权利被侵害之日起（）日内，向企业劳动争议调解委员提出申请。

A．10 

B．30 

C．60 

D．90