单项选择题

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

A．Unawareness of the 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
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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 hour of day.
C．Habit helps one adapt to his own energy cycle.
D．Children have energy cycles, too.
单项选择题
Are all animal bodies ______ cells
A．made of
B．made from
C．made up of
D．made out of
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