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发表于 2007-6-21 11:28:20
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------题目------
The following memo appeared in the newsletter of the West Meria Public Health Council.
'An innovative treatment has come to our attention that promises to significantly reduce absenteeism in our schools and workplaces. A study reports that in nearby East Meria, where fish consumption is very high, people visit the doctor only once or twice per year for the treatment of colds. Clearly, eating a substantial amount of fish can prevent colds. Since colds are the reason most frequently given for absences from school and work, we recommend the daily use of Ichthaid, a nutritional supplement derived from fish oil, as a good way to prevent colds and lower absenteeism.'
------正文------
The arguer cites the evidence, according to a reported study, that people who live in nearby East Meria with the high consumption of fish see the doctor only once or twice a year to cure colds, to illustrates that eating lots of fish can prevent colds. And since colds are the main reasons for absences from school and work, the arguer recommends the daily use of Ichthaid, a nutritional supplement derives from fish oil as a good measure to prevent colds and reduce absenteeism. The recommendation seems logical at the first sight, but unable to convince us as a rational advice through detailed analysis.
The major problem of the argument is that the arguer assumes a causal relationship where only correlation has been indicated, that means, the arguer fails to provide any cogent evidence that high consumption of fish may contribute to the few times to visit the doctors. The case may be the climate in EM is worm and comfortable without dramatically change, or people in EM pay more attention to health which lead to the rare chance to catch cold. Besides, not every person getting a cold will visit a doctor, in other words, people often call doctor for help in some special condition such as having a high fever, or getting a sever headache and so on while most of them will chose to rest at home or take the medicine themselves. Hence visiting a doctor once or twice a year does not means people get a cold only once or twice per year. Lacking the evidence to rule out the above-mentioned alternatives, the arguer's assumption of the causal relationship is unwarranted.
Even if it can be proved that high consumption can really contribute to keeping away from colds, the arguer still fails to convince us if the mentioned drug-Ichthaid, which extracted from the fish oil, has the same function as fish. First of all, does the fish oil contain the components that can prevent colds? Secondly, does Ichthaid, the nutritional supplement derived from fish oil also extract the functional ingredients from the fish oil? Without any information to ensure the factor to prevent colds is contained in Ichthaid, we can highly suspect the validity of this medicine. Moreover, we are not aware of any possible side-effect of Ichthaid, which may cause unknown damage to human health. If the demerit of Ichthaid overwhelms its medical effect, we will not dare to take it, let alone making good use of it.
Before I come to my conclusion, it is necessary to point out another flaw that weakens the logic of the argument. That is, the arguer states the reason that colds are the reason most frequently given for absences from school and work to access to the conclusion that the reduction of colds will also be conducive to lowering absenteeism. But no evidence is applied to support this assumption. The arguer fails to tell us the number of people whose absence due to colds and the proportion they account for the whole group of absentees, without which we will suspect whether cold is the main reason for absence. The arguer, however, supplies no illustration on whether people absent from school or work really got a cold or used cold as an excuse to escape from duty. In the latter situation, preventing colds is by no means a good advice to reduce absenteeism since people will then fabricate another reason for absence.
In conclusion, to make the argument more persuasive, the arguer must be based on more thorough investigation to gather sufficient evidence to narrow down if colds are the reason most frequently given for absence and whether the high consumption of fish can contribute to preventing colds as well as the accurate information referring to the medicine Ichthaid and its possible side-effects. |
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