Bicycle commuting could be more effective in reducing greenhouse gases.

• A、True
  
  

• B、False
  
  

• C、Not Given
  
  

According to the text, mistakes give us chances to（   ）

• A、
  know the truth
  
  
  
  

• B、learn something new
  
  

• C、
  do some experiments
  
  
  
  

• D、
  teach a child a lesson
  
  
  
  

Task 1

16. Paragraph①

17. Paragraph②

18. Paragraph③

19. Paragraph④

20. Paragraph⑤

A. Definition of volunteers

B. How volunteers are organized

C. How volunteers contribute to society

D. Why people want to be volunteers

E. An organization sending volunteers abroad

F. An organization delivering meals to the elderly