问题
单项选择题 共用题干题
某学者在某地进行吸烟与肺癌关系的研究，结果显示，该地人群肺癌年死亡率为0.56‰，吸烟与不吸烟者的肺癌年死亡率为0.96‰和0.07‰
上述研究的人群归因危险度百分比为（）。
A.0.40‰
B.0.89‰
C.92.7％
D.87.5％
E.0.49‰
答案
参考答案：A
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某学者在某地进行吸烟与肺癌关系的研究，结果显示，该地人群肺癌年死亡率为0.56‰，吸烟与不吸烟者的肺癌年死亡率为0.96‰和0.07‰
上述研究的人群归因危险度百分比为（）。
A.0.40‰
B.0.89‰
C.92.7％
D.87.5％
E.0.49‰
参考答案：A
I worked for a short time as a waiter at a a few months ago. I also helped to clean up the tables when it was very . One night, just before Christmas, I found a large black wallet the floor near one of the tables. I guessed I should check it to find out was the owner, but I was very busy at the time. And I imagined that there was something valuable in the wallet, the owner would be back. Sure enough, an hour a man came up to the counter and asked if anyone had found a wallet. I him to describe the lost wallet, and after he described it exactly, I gave him the wallet. He expressed his . He asked me if I had opened , and when I told him “no”. At once he opened it showed that it had nearly $ 800 in cash. He took out a twenty-dollar bill and it to me and I was amazed at this. Thinking about it later, I began wondering whether I would have been if I had known what was in the wallet! I thought that if I had no way to the owner and no one returned to get it, I might keep it. But it also came into my that I actually saved someone’s Christmas plans by finding and returning the wallet. The good feeling it gave me was worth more than we could buy with money.
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