搜题请搜索小程序“爱下问搜题”
问题 选择题

下列说法中，其中正确的是（　　）

A．对于给定的一组数据，它的众数可以不只一个

B．有两边相等且一角为30°的两个等腰三角形全等

C．为了防止甲型流感的传染，学校对学生测量体温，应采用抽样调查法

D．直棱柱的面数、棱数和顶点数之间的关系是面数+顶点数=棱数-2

答案

A、一组数据中出现次数最多的数据叫做众数，它可以不唯一，故该选项正确；

B、有两边相等，必须是夹角相等的两个三角形全等，此30°的角有可能不是夹角，所以不一定全等，故该选项错误；

C、因为，抽样调查具有花费少、省时的特点，但抽取的样本是否具有代表性，直接关系到对总体估计的准确程度，所以为了防止甲型流感的传染，学校对学生测量体温，应采用全面调查调查法，故该选项错误；

D、棱柱的面数、棱数和顶点数之间的关系是面数+顶点数=棱数+2，古该选项错误；．

故选A．

完形填空
完形填空。

     Even though it was only October, my students were already whispering about Christmas plans. With each
passing day everyone became more   1   waiting for the final school bell. Upon its   2  everyone would run for
their coats and go home, everyone except David.
     David was a small boy in ragged clothes. I had often   3    what kind of home life David had, and what kind
of mother could send her son to school dressed so   4    for the cold winter months without a coat, boots, or
gloves. But something made David   5  . I can still remember he was always   6   a smile and willing to help. He
always
  7   after school to straighten chairs and mop the floor. We never talked much. He   8   just simply smile and
ask what else he could do, then thank me for letting him stay and slowly   9   home.
     Weeks passed and the  10   over the coming Christmas grew into restlessness until the last day of   11 
 before the holiday break. I smiled in  12   as the last of them hurried out of the door. Turning around I saw
David   13   standing by my desk.
     "I have something for you," he said and  14   from behind his back a small box.   15   it to me, he said
anxiously,"Open it. " I took the box from him, thanked him and slowly unwrapped it. I lifted the lid and to my
 16   I saw nothing. I looked at David's smiling face and back into the box and said, "The box is nice, David,
but it's  17  ."
     "Oh, no. It isn't." said David." It's full of love. My mum told me before she died that love was something
you couldn't see or touch unless you know it's there."
     Tears filled my eyes  18   I looked at the proud dirty face that I had rarely given  19   to. After that
Christmas,David and I became good friends and I never forgot the meaning  20   the little empty box set on
my desk..

( )1. A. anxious  
( )2. A. warning  
( )3. A. scolded  
( )4. A. modestly 
( )5. A. popular  
( )6. A. expressing
( )7. A. practised
( )8. A. would    
( )9. A. aim at   
( )10. A. argument
( )11. A. school  
( )12. A. relief  
( )13. A. weakly  
( )14. A. searched
( )15. A. Holding 
( )16. A. delight 
( )17. A. cheap   
( )18. A. as      
( )19. A. advice  
( )20. A. from     		B. courageous   
B. ringing      
B. wondered     
B. naturally    
B. upset        
B. delivering   
B. wandered     
B. should       
B. turn to      
B. excitement   
B. year         
B. return       
B. sadly        
B. found        
B. Handing      
B. expectation  
B. empty        
B. until        
B. support      
B. behind        		C. serious      
C. calling      
C. realized     
C. inaccurately 
C. special      
C. wearing      
C. studied      
C. might        
C. put off      
C. movement     
C. education    
C. vain         
C. quietly      
C. raised       
C. Sending      
C. appreciation 
C. useless      
C. because      
C. attention    
C. over          		D. cautious             
D. yelling              
D. learned              
D. inappropriately      
D. funny                
D. sharing              
D. stayed               
D. could                
D. head for             
D. judgment             
D. program              
D. control              
D. helplessly           
D. pulled               
D. Leaving              
D. surprise             
D. improper             
D. though               
D. command              
D. towards            
查看答案
单项选择题

属于违规行为的是（）。

A.戒烟

B.药物滥用

C.疑病、瞒病、恐病

D.情绪好压抑，性格好自我克制

E.喜欢竞争，对人怀有潜在的敌意和戒心
查看答案