57.(  )

2.Directions:In each of the following groups of words, there are four underlined letters or letter combinations marked A, B, C and D. Compare the underlined parts and identify the one that is different from the others in pronunciation. Mark your answer by blackening the corresponding letter on the Answer Sheet.（）

• A、f（ear）
  
  

• B、b（ear）
  
  

• C、w（ear）
  
  

• D、p（ear）
  
  

What was the biggest change in the tortoises in Paragraph 6?

• A、They showed abnormal behaviors.
  
  

• B、They had serious liver problems.
  
  

• C、They lost their appetite for food.
  
  

• D、They had obviously lost weight.