单项选择题

If a person finds getting up early a problem, most probably ______.

A．he is a lazy person
B．he refuses to follow his own energy cycle
C．he is not sure when his energy is low
D．he is at his peak in the afternoon or evening

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单项选择题

Which of the following may lead to family quarrels according to the passage

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.

单项选择题

Which of the following statements is NOT TRUE

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.