Why do dogs wear a guilty look according to the researchers?

• A、To attract their owners
  
  

• B、To deceive ther owners.
  
  

• C、To beg their owners for treats.
  
  

• D、To show obediene to their owers.
  
  

57.(  )

What is astonishing about BP' s annual report?

• A、BP has earned a lot of money by selling plastic products.
  
  

• B、 Cutting back on plastic use may bring more problems.
  
  

• C、BP has become one of the world' s biggest oil companies.
  
  

• D、Cutting back on plastic use may affect product quality.