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gre argument 49题目：
The following appeared in a letter to the editor of a newsletter on health issues.
"For the past decade, most health experts have advised teenagers to avoid eating greasy foods in order to prevent acne and related skin conditions, but the number of teenagers(1,3) who sought medical help for these skin problems has actually risen over the same period(2). In a recent study, teenagers who avoided greasy foods for a month reported approximately as many outbreaks of acne and related skin conditions as did those who ate an average of two servings of greasy food per day(4,5). Such data indicate that eating greasy foods is unlikely to be a cause of acne and related skin conditions. Therefore, health experts should no longer recommend that people(7) avoid such foods(6)."
提纲：
(1)The editor does not inform us what fraction of teenagers actually followed experts’ suggestions during the past decade.
(2)Other reasons may also lead to the increase in the number of teenagers who suffer from skin problems.
(3)The number of teenagers who sought medical help is not a good indication of actual incidence of acne.
(4)The editor does not provide any information about the number of teenagers in the two groups of the recent study.
(5)There might be some other substantial differences between the two groups of teenagers studied.
(6)Eating greasy foods may have negative effects other than causing skin problems .
(7)Avoiding greasy foods may be necessary for people of other ages.
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。
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