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问题 单项选择题

关于流行病学下列哪条是正确的

A．流行病学是从个体角度研究疾病与健康

B．流行病学从整体水平认识疾病

C．流行病学研究的病种仅限于传染病

D．流行病学从疾病分布人手探讨疾病的流行因素

E．流行病学研究的对象是病原携带者

答案

参考答案：D

问答题

[说明] 计算下列源代码的McCabe环数，画出控制流程图并用罗马数字标出区域。 read x，y，z； type =“scalene”； if (x= =y or x = = z or y= = z)type =“isosceles ”； if (x = = y and x = = z) type =“equilateral”； if (x＞= y+ z Or y＞= x+20rz＞=x+ y) type= “not a triangle”； if (x＜=0 or y＜= 0 or z ＜=0) type =“bad inputs”； print type；
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     Someone says, "Time is money." But I think time is   1   important than money. Why?   2   when money
is spent, we can get   3   back. However, when time is   4  , it will never return. That is why we mustn't
waste time. It goes without saying that the   5   is usually limited (有限的). Even a second is very important.
We should make full use   6   our time to do   7   useful. But it is a pity that there are a lot of people who
don't know the importance of time. They spent their limited time smoking, drinking and playing. They don't
know that wasting time means wasting parts of their   8  . In a word we should save time. We shouldn't leave
today's   9   for tomorrow. Remember we have no time to  10 .
( )1. A. much     
( )2. A. Because  
( )3. A. their    
( )4. A. cost     
( )5. A. money    
( )6. A. for      
( )7. A. nothing  
( )8. A. time     
( )9. A. newspaper
( )10. A. lose     		B. less     
B. For      
B. them     
B. bought   
B. time     
B. of       
B. something    
B. food     
B. dinner   
B. save      		C. much less 
C. As        
C. it        
C. gone      
C. day       
C. to        
C. anything     
C. money     
C. work      
C. spend      		D. much more      
D. And            
D. its            
D. finished       
D. food           
D. into           
D. everything                         
D. life           
D. TV             
D. able           
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