—I will go to Kunming by plane for summer vacation next week.

—       .      [ ]

A. It's nice of you                

B. I believe you can    

C. Have a great time              

D. It will be difficult

诊断HIV感染应取（）.

A.鼻咽漱液

B.粪便

C.血液

D.脑组织

E.尿液