人类社会婚姻家庭关系变化的根本动因是（）
A．人的思想观念的变化
B．人的生活条件的变化
C．社会组织形式的变化
D．生产方式的发展变化
参考答案：D
An 18-year-old primagravida tells the nurse that the physician told her that she needed to increase her intake of thiamine (vitamin Bi) in her diet. Which of the following foods should the nurse instruct the client to consume more（）
A. Milk.
B. Rice.
C. Asparagus.
D. Beef.
检测HIV抗体的基本方法是：（）
A.EIA法
B.PCR法
C.颗粒凝集试验
D.特异性快速试验
E.WB试验
