— 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

为使脱水槽中泥化矿物尽快脱去，可通过调节（）来实现。

A.排矿口

B.上升水

C.给矿量

D.给矿浓度