According to the passage, which of the following reached the moo first?

• A、A pair of tortoises.
  
  

• B、American astronauts.
  
  

• C、Russian astronauts.
  
  

• D、Dogs and monkeys.
  
  

56.(  )

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）