My father likes _____ books and _____ TV very much.      [ ]

A. looking, watching          

B. reading, watching      

C. watching, seeing            

D. seeing, reading

一梯形断面明渠，水力半径R=0.8m，底坡i=0.0006，粗糙系数n=0.05，则输水流速为（）。

A.0.42m/s

B.0.48m/s

C.0.6m/s

D.0.75m/s