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
  
  

42. What does the "law of nature"mean? You can find the answer in the passage in (   ).

• A、the first sentence
  
  

• B、the fourth sentence
  
  

• C、the seventh sentence
  
  

• D、the final sentence
  
  

55.(     )