47. What did Dr. Harris Cooper find in his study?

• A、Kids love reading more after the summer.
  
  

• B、Kids show a special interest in math after the summer.
  
  

• C、Kids' math skills become weaker after the summer.
  
  

• D、Kids have a lot of fun in the summer.
  
  

 55.

10. No other city has ever developed as fast as______.

• A、my
  
  

• B、our
  
  

• C、ours
  
  

• D、us