关于流行病学，下列哪种说法正确（）
A.从个体的角度研究疾病和健康
B.只研究传染病的流行和防治
C.只研究慢性病的危险因素
D.研究人群中疾病和健康的分布及其影响因素
E.无法研究原因不明疾病
参考答案：D
解析：此题是理解判断题，考查考生对流行病学基本概念的理解。流行病学是研究人群中疾病与健康状况的分布及其影响因素，并研究如何防制疾病及促进健康的策略和措施的科学。它是一门应用学科，不仅在传染病的防治策略和措施的制定与实施方面起着重要的作用，而且对病因不明的慢性病，如恶性肿瘤、心脑血管疾病等的病因研究与防治发挥着独特的作用。
| Choose the best answer to complete the passage. | |||
| I used to watch a little girl 1 basketball every day from my kitchen window. One day I asked her why she practised so 2 . She said: "I would like to go to college. The only way is 3 a scholarship(奖学金). I like basketball and I want to be the 4 player in college. My dad told me: 'If the dream is big enough, the facts don't count.' " She 5 changed her mind. I watched her through those junior high years and into senior high school. One day before she graduated 6 high school, I saw her sitting on the grass 7 . I asked her what was wrong. She told me her coach said she was 8 a short girl that she couldn't be a good basketball player, so she should 9 dreaming about going to college. She was heartbroken and it 10 made me feel sad. Then she smiled and told me her father said that coach was wrong. He did not understand the power of dream. Her father said to her: "If you really want to 11 the scholarship of a good college, nothing but you 12 can stop your dream." The next year, she and her team went to a big game. She 13 by a coach of a famous college team and was offered a scholarship to the 14 basketball team of their college. She was about to get the college education 15 she had dreamed of and worked towards for all those years. "If the dream is big enough, the facts don't count." It is true. | |||
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