问题
单项选择题 A1型题
时点患病率在理论上是无长度的，但实际上以不超过多长时间为度（）
A.1天
B.1个星期
C.1个月
D.6个月
E.1年
答案
参考答案：C
解析：患病率指某特定时间内总人口中某病新旧病例所占比例。按观察时间的不同分为期间和时点患病率两种，以时点患病率较常用（<1个月）。用来表示病程较长的慢性病的发生或流行情况。
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时点患病率在理论上是无长度的，但实际上以不超过多长时间为度（）
A.1天
B.1个星期
C.1个月
D.6个月
E.1年
参考答案：C
解析：患病率指某特定时间内总人口中某病新旧病例所占比例。按观察时间的不同分为期间和时点患病率两种，以时点患病率较常用（<1个月）。用来表示病程较长的慢性病的发生或流行情况。
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| I remember Navy boot camp (海军新兵训练营) like it was yesterday. You can tell a new person in the camp from someone who is about to__1__ based on their clothes. It was clearly my second day from what I was __2__. I was walking with my __3__ down a hall and a sailor, who was about to graduate, __4__us. He must have noticed my __5__. It without a doubt said, "I am tired, __6__ and hungry." You can't __7__when walking in formation (队列), __8__he whispered out of the side of his mouth, "Hang in there...you can do it." I turned to look at his __9__, but all I saw was the back of his head. Every night before I fell asleep, I repeated those __10__. I would never know that sailor's __11__. However, I knew that the only reason he knew what I was __12__was because he had been where I was. He had __13__ it and wanted me to know that I could as well. I was very __14__. Then it was my __15__. On my graduation day I saw three sailors standing against the wall. They were new and tired, frightened, and hungry. I __16__ over to them and whispered, "Hang in there...you can do it." Within one second tears filled the eyes of the __17__ and the two boys gave me a million __18__ with their eyes. As I walked away I knew that my words would help them __19__ their goal of graduation whenever they wanted to give up. I hope they passed on the __20__ to another sailor before they graduated and I know they did. | |||
| ( )1. A. train ( )2. A. studying ( )3. A. guide ( )4. A. passed ( )5. A. posture ( )6. A. surprised ( )7. A. talk ( )8. A. however ( )9. A. direction ( )10. A. rules ( )11. A. name ( )12. A. seeking ( )13. A. made ( )14. A. curious ( )15. A. habit ( )16. A. looked ( )17. A. soldier ( )18. A. doubts ( )19. A. look for ( )20. A. achievement | B. work B. wearing B. friend B. greeted B. appearance B. puzzled B. run B. therefore B. face B. comments B. task B. asking B. avoided B. depressed B. turn B. got B. child B. thanks B. focus on B. enjoyment | C. battle C. carrying C. group C. stopped C. behavior C. bored C. wave C. besides C. gesture C. words C. reaction C. feeling C. refused C. excited C. change C. took C. girl C. hopes C. build up C. amusement | D. graduate D. buying D. instructor D. showed D. expression D. frightened D. fight D. finally D. clothes D. warnings D. purpose D. doing D. owned D. grateful D. story D. walked D. sailor D. regrets D. pick out D. encouragement |