单项选择题

If one wants to work more efficiently at his low point in the morning, he should ______.

A．change his energy cycle
B．overcome his laziness
C．get up earlier than usual
D．go to bed earlier
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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
From the last paragraph, we know that ______.
A．the Spartans answered Philip a few months later
B．the Spartans didn't answer Philip
C．the Spartans were not afraid of Philip
D．Philip didn't receive the letter written by the Spartans.
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