— A homeless man won a lottery ticket . He became rich overnight .

—         .

A．Better safe than sorry

B．The early birds catches the worm

C．Every dog has its day

D．Too many cooks spoil the broth

系统性因素引起的质量变异，一般属于( )。

A．搞清原因

B．清除隐患

C．界定责任

D．妥善处理