_______ the right to correct his difficult question，the teacher of English was pleased and praised me in front of the class.

A．Having given

B．Having been given

C．To be given

D．Giving

下列关于稳态的叙述，哪项是错误的( )

A．生物体内环境的理化性质经常保持绝对平衡的状态，称为稳态
B．稳态是维持机体正常生命活动的必要条件
C．稳态是一种动态平衡
D．稳态的破坏将影响细胞生命活动的正常进行