57.(  )

What did Robert want to show with his video on YouTube?

• A、Dogs’conflict with other pets.
  
  

• B、Dogs’naughty behaviors.
  
  

• C、Dogs’trust in their owners.
  
  

• D、Dogs’apparent guilty looks.
  
  

What happened to the Soviet spacecraft?

• A、It was wrecked during the mission.
  
  

• B、It was recovered after its return to Earth.
  
  

• C、It stayed in the moon's orbit.
  
  

• D、It disappeared in the outer space.