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问题 单项选择题

未采用盲法收集资料的临床药物疗效实验研究，最容易产生的偏倚是（）。

A.选择偏倚

B.无差异错分偏倚

C.有差异错分偏倚

D.混杂偏倚

E.以上都是

答案

参考答案：C

完形填空
完形填空。
                                                                My School Day in London
      Tim Hunt is telling   1   Chinese classmates about his school day back home in London.
      "My school day in London is different   2   my school day here in China. School starts    3   nine o'clock.
I get up at 7:00   4   weekdays. I go to school by underground(地铁). It   5   about forty-five minutes. I have
lunch at school. Classes are over at 3:15.It is early, so I stay at school and play games   6   my friends. I am
in the basketball team. We practise(练)on Monday   7   Wednesday. We have a match   8   Friday afternoon.
     On Saturday morning I get up late. Then I   9   my parents tidy (弄整洁) the house and the garden. In the
evening I often go to a film or to club (俱乐部).On Sunday I have a good rest and of course, I do   10   !"
( )1. A. he       
( )2. A. from       
( )3. A. for       
( )4. A. for       
( )5. A. goes      
( )6. A. and       
( )7. A. to       
( )8. A. on       
( )9. A. want      
( )10. A. my homeworks		B. him       
B. in       
B. at       
B. of       
B. stands     
B. but      
B. and       
B. in       
B. help       
B. the homeworks		C. his       
C. of       
C. on     
C. on     
C. wants    
C. with    
C. at       
C. at     
C. ask       
C. my homework		D. their             
D. at                
D. in                
D. in               
D. takes         
D. about              
D. with             
D. for               
D. tell              
D. mine homework     
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单项选择题

银鲳又称鲳鱼，以______所产品质最佳。

A．秦皇岛

B．连云港

C．青岛

D．汕头
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