— Tom’s never done extra work for his class, _______he?

—_______. He is the laziest boy in his class.

A．has; Yes

B．is; No

C．is; Yes

D．has; No

Ⅳ度冻伤适用于

A．包扎疗法
B．暴露疗法
C．药液湿敷
D．早期切痂
E．浸浴疗法