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

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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 hours of day.
C．Habit helps a person adapt to his own energy cycle.
D．Children have energy cycles, too.

单项选择题

American university students are usually under pressure of work because ()

A．their academic performance will affect their future careers
B．they are heavily involved in student affairs
C．they have to observe university discipline
D．they want to run for positions of authority