A 20-year time span may not be a period which is long enough to ensure a decisive conclusion.
The author only considers people who responded to the survey, we still do not know the relationship between exercise and longevity in those who did not respond.
The author fails to rule out the possibility that those who engaged in vigorous outdoor exercises do so merely because they had outstanding physique.
Vigorous exercise may be beneficial for some people, but it does not follow that vigorous outdoor exercise will benefit all individuals, especially the patients.
注:题目中括号里的数字表明这句话体现的是提纲中第几号缺陷。
无论是gre issue还是gre argument,考生都应该养成写提纲的习惯。这种提纲式的gre写作练习可以帮助考生锻炼写作的逻辑性,而gre写作高分最重要的得分依据就是作文的逻辑性要强。
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