Bicycle commuting could be more effective in reducing greenhouse gases.

• A、True
  
  

• B、False
  
  

• C、Not Given
  
  

Task 2

21. People do voluntary work because they want to（   ）

22. Some volunteers help others by（   ）

23. Some organizations rely on volunteers to help（   ）

24. The elderly can have their meals delivered without（   ）

25. Many volunteers returning from poor countries（   ）

A. help others

B. leaving their homes

C. cooking for the elderly

D. using their professional skills

E.find their experience rewarding

F.preserve the natural environment

10. Bikes are inexpensive to most people.

• A、True
  
  

• B、False
  
  

• C、Not Given