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【单选题】
根据过去某时点的特征或暴露情况将研究对象分为不同组别，然后从那时开始依据已有的记录，追溯到研究当时为止的一段时间内每个成员发病或死亡的情况，以评价暴露与疾病的关系A.
生态学研究
B.
病例对照研究
C.
队列研究
D.
历史性队列研究
E.
筛检
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皮皮学刷刷变学霸
举一反三
【单选题】A word is easier to remember and understand if it is ______.
A.
included in a word list
B.
pronounced correctly
C.
explained in English
D.
used in a context
【多选题】In traditional grammar, there is pronoun to be used to substitute for a nominal group or a single noun. Linguists have other pro-forms to substitute for other items. They are mainly ________________.
A.
pro-adjective
B.
pro-verb
C.
pro-adverb
D.
pro-locative
【简答题】Passage 2 Green is not always referring to the color. In some cases, it is the term used for 1 ( environment ) friend ly . If you've been expecting to replace your furniture, consider 2 (go) green bec...
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