单项选择题
A.Unawareness of energy cycles. B.Familiar monologues. C.A change in a family member's energy cycle. D.Attempts to control the energy cycle of other family members.
A.help to keep your energy for the day's work B.help you to control your temper early in the day C.enable you to concentrate on your routine work D.keep your energy cycle under control all day
A.Getting off to work with a minimum effort helps save one's energy. B.Dr. Kleitman explains why people reach their peaks at different hours of day. C.Habit helps a person adapt to his own energy cycle. D.Children have energy cycles, too.