单项选择题

For our bodies to function properly, we should ______.

A．sleep for at least eight hours per night
B．believe that we need less sleep as we age
C．adjust our activities to new environment
D．be able to predict the rhythms of our biological clocks

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单项选择题

Which of the following measures can help you sleep better

A．Staying up late.
B．Taking a hot bath.
C．Having late meals.
D．Traveling between time zones.

单项选择题

From the passage we can conclude that the US has come to realize ______.

A．the weakening of the US dollar can result in trade deficits
B．the lower the retail prices, the greater the profits
C．tourism can make great contributions to its economy
D．visitors to the US are the wealthiest in the world