___I don't think he is studying English in his room now.

____Oh, _________?

A．does he

B．doesn't he

C．is he

D．isn't he

临床上糖皮质激素用于严重感染的目的是（）

A．增强抗生素的抗菌作用

B．提高机体抗病能力

C．中和外毒素

D．加强心肌收缩力，改善微循环

E．提高机体对内毒素的耐受力