问答题

现代化的机器完成了人们曾被迫用手工来完成的体力劳动。小汽车、公共汽车运载着我们飞快地从一地到另一地。由于无所事事，人们的身体变得十分虚弱并易于生病。为了避免这种状况的发生，成千上万的美国人把更多的时间投入到体育锻炼之中。这种对体育锻炼重要性的认识所产生的结果是显而易见的。

【参考答案】

Modern machines do all the physical labor that people were o......

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问答题

Topic：Epidemic Diseases and Public Health Crises

单项选择题

The research done by the Dement commission shows that Americans______.

A．don’t like to take naps
B．are terribly worried about their national debt
C．sleep less than is good for them
D．have caused many industrial and traffic accidents

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