GRE作文范例10

The following appeared in the editorial section of a health and fitness magazine.

"In a study of the effects of exercise on longevity, medical researchers tracked 500 middle-aged men over a 20-year period. The subjects represented a variety of occupations in several different parts of the country and responded to an annual survey in which they were asked: How often and how strenuously do you exercise? Of those who responded, the men who reported that they engaged in vigorous outdoor exercise nearly every day lived longer than the men who reported that they exercised mildly only once or twice a week. Given the clear link that this study establishes between longevity and exercise, doctors should not recommend moderate exercise to their patients but should instead encourage vigorous outdoor exercise on a daily basis."

It is natural to assume that exercise would have a positive effect on the length of life for middle-aged men given all of the medical literature that has been published in the past showing a positive correlation between exercise and longevity. In this particular argument, the writer puts forth a study purporting to track five hundred middle-aged men with different occupations in different parts of the country. The survey was apparently conducted on the basis of an annual survey asking how often and how strenuously these men exercised. The writer not only concludes that there is a clear link between longevity and exercise, but that doctors should not recommend moderate exercise, rather vigorous outdoor exercise on a daily basis to all their patients. This writer's argument fails to convince in a number of areas due to several lapses in logical thinking.

The first and most glaring error in logic lies in the fact that the results of only two types of exercising men are reported: those that exercise strenuously outdoors almost every day and those that only had mild exercise once or twice per week. There are n

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