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.

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单项选择题

You are advised to rise with a yawn and stretch because it will ______.

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

单项选择题

A short answer is often spoken of as ______.

A．a wonderful answer
B．an impolite answer
C．a Laconic answer
D．a complete answer