流行病学科学研究工作由浅入深依次推进的三个工作范畴是（）。
A.找出原因、揭示现象、提供并确证措施
B.提供措施、确证措施有效性、用于人群
C.找出规律、总结分析、验证原因
D.揭示现象、找出原因、提供措施
E.揭示分布、找出规律、总结分析
参考答案：D
解析：流行病学科学研究工作由浅入深依次推进的三个工作范畴是揭示现象、找出原因和提供措施。
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