单项选择题

According to the author, in which decade of the nineteenth century did a steamship first attempt to compete with the transatlantic packets

A．The twenties.
B．The thirties.
C．The forties.
D．The fifties.
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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
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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