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.

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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．get up earlier than usual
C．overcome his laziness
D．go to bed earlier

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