42. Which of the following is true about Sweden' s recycling revolution?

• A、The government encourages people to store used goods. 
  
  

• B、Scientists are funded in inventing new clothing materials.
  
  

• C、The kids must put the cartons into the recycling station.
  
  

• D、People may buy new clothes cheaper after returning old ones.
  
  

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19. Natural gas can serve as an _____to coal and oil because it is more environmentally friendly.

• A、option

• B、extra

• C、addition

• D、alternative