评价一项筛检试验真实性的资料可整理成以下表格形式；试验结果为阳性且有病者为a，无病者为b；试验结果为阴性且有病者为c，无病者为d。假阴性率为
A. a/(a+b)
B. a/(a+c)
C. b/(b+d)
D. c/(a+c)
E. d/(b+d)
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以下不是流行病学特征的是
A. 群体特征
B. 对比的特征
C. 概率论的特征
D. 预防为主的特征
E. 以治疗疾病为主的特征标准答案
下列不是流行病学用途的是
A. 疾病监测
B. 疾病治疗
C. 疾病预防和健康促进
D. 疾病防治效果的评价
E. 疾病自然史研究
Listen to the talk about working in a factory. Q: What is the speaker NOT able to do well because of shift work?
A. Have a social life.
B. Sleep well.
C. Eat regular meals.
Do errands.
Listen to the speech on being a boss. Q: What will the boss possibly do with the employee?
A. The boss will promote the employee.
B. The boss will give the employee more money.
C. The boss will fire the employee.
D. The boss will hire more employees.
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