单项选择题

It can be learned from the passage that ______.

A．country life is peaceful but dull
B．people living in big cities are easy to get excited
C．few Americans go to church on Sundays now
D．Americans tend to be rough and impolite today

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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.

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.