28.When the telephone rang, I happened________in the kitchen, but when I came over to get it, it

rang off.

A．to cook

B．to have cooked

C．to be cooking

D．having cooked

女性，25岁，自幼有哮喘病史，春游后气急1天就诊，此时不宜做哪项检查（）

A.胸部X线

B.血气分析

C.血清IgE检测

D.皮肤过敏原试验

E.血嗜酸性粒细胞检测