On the third floor there are two rooms, _____ is used as a meeting-room. 　　[ ]

A. one of them 　　　　　　

B. the larger of which 　　

C. and a larger of them

D. the largest one of which

关于慢性支气管炎病人的治疗，下列哪项不妥()。

A．缓解期应常规服用抗生素预防感染

B．急性发作期以抗感染治疗为主

C．喘息明显者应给予解痉、平喘药物

D．多饮水，以稀释痰液

E．缺氧明显者可给予低流量吸氧