-- We don’t think we’ll be able to go mountain-climbing tomorrow.

—______ the weather turns out fine?

A．How come

B．How about

C．What if

D．Why not

行业差别费率是根据各行业的（）的类别划分的。

A.环境的恶劣程度 

B.职业危害性 

C.伤亡事故风险和职业危害程度 

D.事故发生率