问题
单项选择题
在揭示暴露和疾病的因果关系的探索过程中最基础的步骤是（）
A.提出病因假设
B.验证病因假设
C.描述疾病／暴露三间分布
D.随机分组
E.进行临床试验
答案
参考答案：C
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在揭示暴露和疾病的因果关系的探索过程中最基础的步骤是（）
A.提出病因假设
B.验证病因假设
C.描述疾病／暴露三间分布
D.随机分组
E.进行临床试验
参考答案：C
My little angel, you are teaching me how selfless real love is! My wife called, “How long will you be with that ? Will you come here and make your darling daughter eat her food?” I threw the paper away and to the place. My daughter, Sindu, sat there, tears welling up in her eyes. In front of her was a big bowl of rice. I the bowl and persuaded: “Sindu, why not take a few mouthfuls of this rice?” “Ok, Dad. I will eat — not just a few mouthfuls, the whole lot of this. But…” Sindu hesitated. “Dad, if I eat this entire rice, will you give me I ask for?” “Promise.” I . After eating the rice painfully, Sindu came to me, her eyes wide with . Now I became a bit . “Dear, you shouldn't insist on a computer or any such things. Dad does not have that kind of money right now.” , “I want to have my head shaved off(剃掉), this Sunday!” was her demand(要求), which was far my belief. On Monday morning, I Sindu at her school and watched her walking towards her classroom. She turned around and . I waved back with a smile. Just then, a boy, who just got out of a car, shouted, “Sindu, please wait for me!” What me was the hairless head of that boy. “Sir, your daughter is indeed!” Without introducing herself, a lady standing beside me continued, “That boy is my son, who lost all his because of a disease. He to come back to school fearing the unintentional(无意的)but teasing（取笑）of the schoolmates. Sindu visited him last week, and promised him that she would take care of the teasing issue. But, I imagined she would sacrifice her lovely hair for my son!”
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