The headmaster and secretary as well as the teachers      discussing LiBai’s New Selected Poems that      published last month.

A．are; were

B．is; were

C．are; was

D．is; was

目前，在疼痛治疗中最接近理想的神经阻滞的方法是()

A．神经射频热凝术

B．神经破坏药行神经阻滞

C．局麻药神经阻滞

D．蛛网膜下隙阻滞

E．硬膜外阻滞