--- I don’t suppose the police know who did it.  

--- Well, surprisingly they do. A man has been arrested and ____ now.   [ ]

A. has been questioned      

B. is being questioned  

C. is questioning          

D. has questioned

牛黄的鉴别特征不包括下列哪一项（）

A.长在胆囊或胆管中的结石

B.表面红黄色，有的有"乌金衣"

C.质地酥脆，易分层剥落，断面黄色

D.气清香，味苦而后甜，有清凉感

E.质硬，敲碎后可见同心层纹