下列实验室方法中哪种可确诊艾滋病（）
A.动物接种
B.免疫荧光法
C.酶免疫测定法
D.凝集试验
E.免疫印迹试验
参考答案：E
农村集体经济统计中，需要进行调查的某种社会经济现象的总体，称为（）。
A.调查对象
B.调查单位
C.统计指标
D.分组标志
You want to invite Susan to a party. Write an invitation letter to her, elaborating on the reason why such a party should be held and what activities will be arranged for them.
Do not sign your own name at the end of the letter. Use "Li Ming" instead.
Do not write the address.
