whAt is thE Author's purposE oF rEFErring to sAm's BrokEn BiCyClE
A．to illustrAtE thE wAys to rEpAir his BiCyClE.
B．to DisCuss thE proBlEms oF his BiCyClE.
C．to tEll us how to solvE A proBlEm.
D．to show us how to AnAlyzE A proBlEm.