问题 单项选择题

下列哪一项是我们在病例对照研究中选择对照时最理想的对照来源()

A.社会团体人群中的非该病病例或健康人

B.同一或多个医疗机构中诊断的其他病例

C.病例的邻居或所在居委会、住宅区内的健康人或非该病病人

D.病例的同事

E.病例的配偶

答案

参考答案:A

解析:对照最好是全人群的一个无偏样本,或是产生病例的人群中全体非患该病的人的一个随机样本,而且也经过相同诊断确认为不患所研究的疾病。

阅读理解

阅读理解。

  After Mr and Mrs Smith spent a happy morning at the zoo with Joe,their four-year-old grandson they stopped at the restaurant and then went into it for lunch.When the waiter passed them some menus, Mr

Smith reached into his pocket for his glasses. He was disappointed(失望的)to find that they were lost.“I

know where your glasses are, Grandpa ,"said the grandson.    

  "Where?"asked Mr Smith happily.     

  "They are at the zoo. ”Joe answered. “When you took me off the train near the elephants,they fell out

of your pocket. ”    

  Mr Smith was a little angry and he asked,"Joe,if you saw my glasses fall out of my shirt,why didn't

you tell me?”    

  "Well,Grandpa,"said Joe,"after you put your foot on them,I didn't think you wanted them any

more.      

1. Where did they stay the whole morning?

A. A restaurant.      

B. At the zoo.

C. Their home.      

D. The station.

2. Which one is TRUE according to the passage?

A. Joe is the son of Mr and Mrs Smith.    

B. They had their lunch at home.     

C. Mr Smith found his glasses at last.

D. Mr Smith's glasses were broken.

3. Where was Mr Smith’s glasses?    

A. At the restaurant.    

B. 0n the way to the restaurant.     

C. At the zoo.

D. In Mr Smith’s pocket.

4. What happened to Mr Smith's glasses at last?   

A. Stolen by the thief.    

B. Broken by Joe.    

C. Lost at the zoo.

D. Stepped by Mr Smith.

5. What do you think of Joe?

A. Clever    

B. Naughty.      

C. Silly.    

D. Lovely.

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