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问题 单项选择题

晶粒细化的方法一般有（）三种。

A、增加过冷度、变质处理和缓慢凝固

B、增加过冷度、高频处理和施加振动

C、增加过冷度、变质处理和控制尺寸

D、增加过冷度、变质处理和施加振动

答案

参考答案：D

填空题

已知等腰三角形的一个内角为70°，则它的顶角为（    ）度．
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完形填空
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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