A.He uses it to race.
B.He uses it to tour.
C.He uses it to go to work.
D.He uses it to exercise.
A.Get one bicycle top of the line.
B.Choose one bicycle from the trade-ins.
C.Rent a second hand bicycle.
D.Buy a racer or a touring bike.
A.how to adapt to the environment
B.how to defeat something dangerous
C.how to forecast weather
D.how to control moving objects
A.In schools.
B.From the nature.
C.From their experience.
D.From their parents.