51. (    ) 

二、詞匯與語法知識: 共15小題; 每題2分, 共30分。從每小題的四個選擇項中, 選出最佳的一項。

6. Teachers recommend parents (   ) their children under 12 to ride bicycles to school for safety. 

• A、not allow
  
  

• B、do not allow
  
  

• C、mustn't allow
  
  

• D、couldn't allow
  
  

38. In the"whisper test"the little girl (   ).

• A、had her bad ear shut completely 
  
  

• B、had her both ears shut completely 
  
  

• C、could hear the teacher with her good ear 
  
  

• D、couldn't hear the teacher at all