______ every year, many people do not hold a high opinion of the CCTV Spring Festival Gala, it has

become a somewhat necessary part of the festival.  [ ]

A. As          

B. Therefore      

C. While          

D. Since  

下列不是成人长骨结构的是（）。

A.骨膜

B.骨皮质

C.骨髓腔

D.骨端

E.骨骺