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发表于 2010-8-12 20:59:37 |只看该作者 |倒序浏览

TOPIC: ARGUMENT96 - The following appeared in a magazine focusing on health and fitness.

"A recent study of several nutritional supplements showed that subjects who took a daily pill containing luceen had significantly better vision of distant objects than subjects in the study who took other nutritional supplements. Luceen appears naturally in a tasty fruit that grows on the island of Bonopia, and very few inhabitants of that island wear eyeglasses or other corrective lenses. Such evidence suggests that people who develop vision problems should take regular luceen supplements."
WORDS: 445 TIME: 00:30:00 DATE: 2010/8/12 20:51:00

In the argument ,the author draws a conclusion that people with eye troubles should take luceen supplements, for the reason that luceen will do good to eyes. In order to substantiate his conclusion, the author provides the evidence that residents on an island named Bonopia rarely suffer from vision problems, where a kind of tasty fruit containing luceen grows. However, the author's conclusion relies on several unproved assumptions as discussed below, which render it unconvincing as it stands.

To begin with, the conclusion that residents on the island enjoy a good vision is ungrounded, since it is based on the fact that people living there hardly wear eyeglasses or other kinds of corrective lenses. The author negelects the possibility that those residents may be too poor to buy glasses. Apart from that, they might do not need to wear glasses to have a clear vision. It is totally possible that they make a living on farming, which merely demands a general sight. The author's assumption that those people have a better vision depending on that fact only is too assertive.

What's more, even though residents there do have a better sight, we cannot conclude it owes to the function of luceen. A myriad of other factors might also devotes to better vision, such as healthy eye-using habit and better genes. To be specific, perhaps residents on the island do not watch TV for a long time, and they often rest for a while when they feel uncomfortable with eyes, which is of great help to maintaining healthy eyes. Without ruling out these and other possibilities that may lead to better vision, the author can not make me convinced of his suggestion. Moreever, it is entirely possible that those residents don't eat certain fruits containing luceen.

Finally, assuming that luceen indeed will do good to eyes, concluding that peple with vision problems should take rugular leceen supplements is too assertive. The example of Bonopia is not scientific at all. We don't know yet whether it has side-effects or not. Common sense awares me that all kinds of drug will harm human body to some extent. Therefore a careful analysis must be taken to guarantee it is worthy and proper to take luceen regularly.

In sum, the argument is dependent on a series of dubious assumptions, which makes it unpersuasive. To bolster the author's claims, he has to demonstrate that island residents enjoy good eyesight conditions mainly derives from eating fruits containing luceen. On the other hand, to make a convincing recommendation, a scientific research of luceen is needed so as to prove it is generally safe and effective. Health problem is not kids' play, after all.