问题 单项选择题

在判断因果联系的标准中,随着暴露剂量增加而联系强度也随之增大,表明()

A.存在联系的合理性

B.存在联系的强度

C.存在剂量一反应关系

D.存在联系的一致性

E.时间顺序合理,先因后果

答案

参考答案:C

解析:此题是理解判断题,考查考生对流行病学病因推断标准中对剂量反应关系的理解。剂量反应关系是指当研究因素可以定量或分等级时,如果该因素量的变化可以引起疾病发生频率的相应变化,则该因素和疾病间存在因果联系的可能性较大。

单项选择题

阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。学科&网

Hundreds of people have formed impressions of you through that little device(装置) on your desk. And they’ve never actually   41   you. Everything they know about you   42   through this device, sometimes from hundreds of miles away.   43   they feel they can know you   44   from the sound of your voice. That’s how powerful the   45   is.

Powerful, yes, but not always   46  . For years I dealt with my travel agent only by phone. Rani, my faceless agent whom I’d never met   47  , got me rock-bottom prices on airfares, cars, and hotels. But her cold voice really   48   me. I sometimes wished to   49   another agent.

One morning, I had to   50   an immediate flight home for a family emergency. I ran into Rani’s office   51  . The woman sitting at the desk,   52   my madness, sympathetically jumped up. She gave me a   53   smile, nodded while listening patiently, and then printed out the   54   immediately. “What a wonderful lady!” I thought.

Rushing out   55   I called out over my shoulder, “By the way, what’s your name?” “I’m Rani,” she said. I turned around and saw a   56   woman with a big smile on her face waving to wish me a safe trip. I was   57  ! Why had I thought she was cold? Rani was, well, so   58  .

Sitting back in the car on the way to the airport, I figured it all out. Rani’s   59  ---her warm smile, her nods, her ‘I’m here for you’   60  ---were all silent signals that didn’t travel through wires.

55()

A.hopefully

B.disappointedly

C.gratefully

D.regretfully

单项选择题