A．compensate for a problem brought by arm exercises
B．make the whole body balanced
C．prevent fatigue   ~
D．lose weight

A．Riding bicycles for a long distance．
B．Walking vigorously with arm weights．
C．Weight lifting．
D．Arm stretching．

A．when they spend less time in a drugstore
B．when they have very little time in a department store
C．when they have a lot of time in a drugstore
D．when they spend very little time in any stores