现在，成千上万的美国人沉湎于对身材苗条的追求之中。他们着迷于节食和锻炼，这不仅仅是因为他们对年轻外表的追求，最近的一项研究表明节食和体育锻炼对身体健康的

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问题现在，成千上万的美国人沉湎于对身材苗条的追求之中。他们着迷于节食和锻炼，这不仅仅是因为他们对年轻外表的追求，最近的一项研究表明节食和体育锻炼对身体健康的具有极端重要性。如同在许多工业技术发达的国家中一样，北美人的生活方式发生了显著的变化。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来到另一地。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：公园里到处都是散步和骑自行车的人，体育节目又重新树立了威望，许多公司都为自己的员工提供特殊的运动器材供他们在工作日当中锻炼身体。

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答案 Now, millions of Americans have become obsessed with staying slim and "in shape". The pursuit of a youthful physical appearance is not, however, the sole reason for America’s fascination with diet and exercise. Recent research has shown the critical importance of diet and exercise for personal health. As in most technologically developed nations, the life-style of North Americans has changed dramatically during the course of the last century. Modern machines do all the physical labor that people were once forced to do by hand. Cars and buses transport us quickly from point to point. As a result of inactivity and disuse, people’s bodies can easily become weak and vulnerable to disease. In an effort to avoid such a fate, millions of Americans are spending more of their time exercising. The effect of this new appreciation of the importance of exercise is evident; parks are filled with joggers and bicyclists, physical education programs are enjoying a newly found prestige, and many companies are providing special exercise facilities for their employees to use during the work day.

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现在，成千上万的美国人沉湎于对身材苗条的追求之中。他们着迷于节食和锻炼，这不仅仅是因为他们对年轻外表的追求，最近的一项研究表明节食和体育锻炼对身体健康的