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问题 单项选择题 A1/A2型题

关于试验的敏感性和特异性叙述正确的是（）

A.敏感性=阴性结果总数／未感染患者数

B.敏感性越高，假阳性越少

C.敏感性=所有阳性结果数／所有感染患者数

D.特异性越低，假阳性越少

E.敏感性和特异性无关

答案

参考答案：C

解析：敏感性=所有阳性结果数／所有感染患者数，试验敏感性越高，假阴性就越少。试验敏感性和特异性是相互联系的，敏感性增加，会使特异性下降。

阅读理解

阅读理解。

     Jim is five years old. He is in Beijing with his parents. His parents love him very much. His father works

  in a hospital (医院).  His mother has no job.

     Today is Tuesday. Jim's father doesn't go to work. He wants to take Jim to see his grandparents.  First

 (首先) he goes to the supermarket (超市) to buy some bananas.  Then they take the bus to Jim's

 grandparents' home.  On the bus, Jim is very happy. He runs and runs. His father asks Jim,  "Why do you

 run?" "I want to see my grandparents earlier (早点儿) ," says Jim.

1. Jim is in Beijing with his _____.

    A. grandparents  

    B. grandfather    

    C. parents      

    D. aunt

2. Jim's father doesn't go to work on _____.

    A. Tuesday      

    B. Monday    

    C. Thursday    

    D. Sunday

3. Jim's _____ works in a hospital.

    A. mother      

    B. grandfather    

    C. grandmother    

    D. father

4. Jim takes a _____ to see his grandparents.

    A. taxi        

    B. train        

    C. bus        

    D. plane

5. Jim's father buys some _____ in the supermarket.

    A. apples      

    B. pears        

    C. oranges      

    D. bananas
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单项选择题

肝火上炎引起出血治法为

A．重要病机之一
B．多次、多食、多尿、消瘦、乏力
C．肺、胃、肾
D．清热润燥，养阴生津
E．阴津亏损，燥热偏盛
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