问题 填空题

若3a2-a-2=0,则-6a2+2a=______.

答案

由3a2-a-2=0,得3a2-a=2,

∴-6a2+2a=-2(3a2-a)=-2×2=-4.

完形填空
完形填空。
     On Sunday morning,   Helen usually gets up very late.   She washes her face and then goes  out to   1   morning
exercises. It is about 8.20 a.m.  After eating her   2     , she goes to a shopping centre called Times Shopping Centre
   3    her mother. The shopping centre is not far    4   their home. It only 5   them about 20 minutes to get there   6   ,
so they like walking there. Helen enjoys shopping   7 there very much. It is new  8  big.  9 many things, such as TVs,
fridges, bikes, computers, clothes, books, food and drinks. There are many   10   too. There are men and women, old
and 11  . Parents must   12  their children. The shopping centre is so big. Young children may get lost (迷失) in it. 
 13  
do so many people come here to buy things? Do you know? Helen said that things there are usually good and 
  14 .The workers there are always nice and friendly. She also said that she would take   15  there and have a look if
you come to her home.
( )1. A. play        
( )2. A. dinner      
( )3. A. with        
( )4. A. to          
( )5. A. takes      
( )6..A. by foot    
( )7. A. to          
( )8. A. but        
( )9. A. They're    
( )10.A. students    
( )11.A. tall        
( )12.A. look for    
( )13.A. What        
( )14.A. cheap      
( )15.A. you        
B. do            
B. lunch          
B. to            
B. into          
B. makes          
B. use foot      
B. /              
B. with          
B. There are      
B. people        
B. short          
B. look like      
B. Who            
B. expensive      
B. them          
C. run        
C. supper      
C. for          
C. at          
C. spends      
C. on foot      
C. at          
C. and          
C. There be    
C. teachers    
C. young        
C. look at      
C. Why        
C. big          
C. him          
D. make        
D. breakfast    
D. of          
D. from        
D. costs        
D. with foot    
D. to          
D. or          
D. There is    
D: children    
D. small        
D. look after  
D. When        
D. new          
D. her          
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