What factors do epidemiologists study?-考呗网题库移动版

不定项选择题What factors do epidemiologists study?

参考答案A, C

解析:

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不定项选择题Based on the information in the talk，indicate whether each sentence below describes descriptive， observational，or experimental epidemiology．根据听到材料，回答25-26题。

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不定项选择题Why do epidemiologists often study two groups of people?

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不定项选择题Listen again to part of the talk．Then answer the question．

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