唐玄宗统治前期，唐朝社会进入鼎盛时期，历史上称为[ ]

A．文景之治

B．开皇之治

C．开元盛世

D．贞观之治

— What is your father?

—             . [ ]

A. He's at home

B. He's a teacher.

C. She's a teacher

D. He's in his school