以下哪一个不是流行病学的特征（）
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
参考答案：E
解析：此题是理解判断题，考查考生对流行病学基本特征的理解。流行病学作为一门医学科学的基础学科和方法学，具有如下一些特征：群体特征、对比的特征、概率论与数理统计学的特征、社会心理的特征、预防为主的特征、发展的特征。
Every school has its own rules. In some schools in America, students __1__ chew gum(口香糖). Some schools in Britain don’t let their __2__ have strange hairstyles. However, one __3__ is very popular around the world: students __4__ to wear uniforms on schooldays, but many students don’t like to wear the school uniforms. They think the uniforms are the ugliest __5__ in the world, but schools don’t let their students wear __6__ own clothes at school. Some students draw cartoons or some famous singers on their __7__. They think it is very __8__ that everyone wears the same clothes. What do you think ___9__ it? Do you __10__ your school uniform?
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