— What's wrong with your uncle, Jack? 　　　　

— He is ill. A doctor ______. [ ]

A. has to look for　　　　　　　　　

B. is being operated on 　　

C. must ask for　　　　　　　　　　

D. has just been sent for

SARS为

A．呼吸道传染病
B．肠道传染病
C．自然疫源性疾病
D．性传播疾病
E．烈性传染病