A.improves our physical health |
B.does good to the environment |
C.changes our mental slates of mind |
D.helps us enjoy the sunny spring |
A.history | B.geography |
C.sports | D.food |
A.advise people to lose more weight |
B.ask people to repair and paint the old bikes |
C.preventpeople from staying at home watching TV |
D.makepeople realize the advantages of riding bicycles |