She _        royal stories for the BBC when she was  a reporter.       [ ]

A. reported to                  

B. reported on      

C. reporting on              

D. was reported

喷嘴按喷出的雾流形状一般可分为（）类型。

A.锥形喷嘴

B.伞形喷嘴

C.扇形喷嘴

D.束形喷嘴

E.三眼喷嘴