The spokesman of the government has announced that the UFO approaching the city has been _____ identified

as being a satellite.[ ]

A. violently

B. definitely

C. specially

D. properly

有关永久性细胞的描述中，哪项是正确的：

A．损伤后可以完全再生的细胞

B．在生理状态下，该类细胞不断衰亡、更新的细胞

C．损伤后不能再生，成为永久性缺损的细胞

D．该类细胞主要包括较幼稚组织如间叶组织等

E．容易受损的细胞