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圆锥被平面截切后产生的截交线形状有（）；（）、抛物线、椭圆、双曲线五种。

答案

参考答案：圆、两相交直线

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病毒分离培养方法包括动物接种、鸡胚培养和______。
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完形填空。
     Lucy is from Canada. Her Chinese is very   1   , she can   2   speaks a little. Tomorrow is Mother's Day.
She wants something   3   her mother. It is   4   today, she wants   5   shopping.
     In the shop, she   6   a nice coat, it's red and white. Lucy likes it   7 , so she buy it   8   her mother. She
buys   9   candies (糖果), too. But she doesn't buy   10   trousers, they are too expensive (昂贵的).
(  )1. A. good  
(  )2. A. only   
(  )3. A. to    
(  )4. A. good   
(  )5. A. to   
(  )6. A. find  
(  )7. A. a lot of
(  )8. A. for   
(  )9. A. a bags of
(  )10. A. some  		B. much    
B. has    
B. for    
B. free    
B. going   
B. finds      
B. very  
B. to         
B. any 
B. any                		C. poor                  
C. also                 
C. with                 
C. fine                   
C. go goes             
C. finding                 
C. a lot          
C. with                   
C. two bags of  
C. many                
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