argument45 FLY AW小组第46次作业

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Argument45  第7篇 让砖头来得更猛烈些吧！
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作者：寄托家园作文版普通用户     共用时间：30分0秒     368 words
从2006年6月15日13时21分到2006年6月15日13时30分
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The following appeared as an editorial in a wildlife journal.
'Arctic deer live on islands in Canada's arctic region. They search for food by moving over ice from island to island during the course of a year. Their habitat is limited to areas warm enough to sustain the plants on which they feed, and cold enough, at least some of the year, for the ice to cover the sea separating the islands, allowing the deer to travel over it. Unfortunately, according to reports from local hunters, the deer populations are declining. Since these reports coincide with recent global warming trends that have caused the sea ice to melt, we can conclude that the decline in arctic deer populations is the result of deer being unable to follow their age-old migration patterns across the frozen sea.'
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The arguer asserts that the decline in arctic deer population is the result of deer being unable to follow their age old migration patterns across the frozen sea. To support this conclusion, the arguer illustrates the reports of local hunters and the recent global warming. However, neither the former nor the latter can powerfully back up the arguer's assertion.

First of all, it is unverified to deduce from the hunters' reports that the arctic deer population is declining. On one hand, can the hunters' reports cover the situation of the different seasons? On the other hand, can these reports represent the general situation of the entire deer habitat? Probably the answers are no. While the arctic deer travel across many sea separating islands annually, the reports coming from local hunters may only focus on a limited region within a short period of time. As a result, if such reports are not able to document the entire deer habitat through out the year, it is unreasonable to use such results to represent the status of deer population.

Besides, it is unsubstantiated to claim that the global warming prevent the arctic deer from traveling across frozen sea. Although the global warming tends to cause the sea ice to melt, no evidence indicates that the sea ice cannot be formed in the area of deer habitat, especially in freezing seasons. Actually, even many waters in warmer regions become frozen in winters, and in such seasons it is easy for arctic deer to travel over frozen sea ice. Therefore, it is unreasonable to announce that the deer are unable to follow their age-old migration patterns.

Furthermore, even if the deer population is declining, and the global warming is significant enough to prevent the deer from traveling across frozen sea, no additional information indicates any relationships between these two phenomena. The decline of deer population can be caused by many other factors, such deficient food available, unlimited hunting, and increasing global pollutions. Thus, without carefully examining such factors, it is too arbitrary to attribute the decline of deer population to the disabled migration patterns.

In conclusion, the arguer's assertion is not convincing enough to be accepted by ordinary people. Neither the decline of deer population nor the effect of global warming has been carefully examined, while no evidence proves that the former results from the latter.