—Is Mr Black in ? 

—No, he is out. ________? 

—No, thank you. [ ]

A. What's up              

B. Can I take a message for you

C. Can I hold on a moment  

D. When will you call him back.

尾蚴皮炎的治疗原则为（）。

A.激素治疗

B.消炎、止痒、防止继发感染

C.外用药物治疗为主

D.足量抗生素

E.抗过敏治疗