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题目：
The following appeared in a health magazine published in Corpora.
"Medical experts say that only one-quarter of Corpora's citizens meet the current standards for adequate physical fitness, even though twenty years ago, one-half of all of Corpora's citizens met the standards as then defined. But these experts are mistaken when they suggest that spending too much time using computers has caused a decline in fitness. Since overall fitness levels are highest in regions of Corpora where levels of computer ownership are also highest, it is clear that using computers has not made citizens less physically fit. Instead, as shown by this year's unusually low expenditures on fitness-related products and services, the recent decline in the economy is most likely the cause, and fitness levels will improve when the economy does."
Write a response in which you examine the stated and/or unstated assumptions of the argument. Be sure to explain how the argument depends on these assumptions and what the implications are for the argument if the assumptions prove unwarranted.
分析：
Statement翻译：按照20 年前对完全健康的定义当时 Corpora 一半的居民是完全健康的。 今天， 医学专家指出全市只有四分之一的市民达到完全健康水平，并指出长时间的使用电脑导致健康状况下降。但是由于在 Corpora 电脑拥有量最高的地区居民的总体健康水平却是最高的，显然使用电脑并没有导致市民体质的下降。相反，今年用于健身产品和服务的花费低的异乎寻常，这表明最近经济的衰退是最可能的原因，当经济复苏了健康水平也会随之提高。
参考提纲：
1.作者没有提供信息说明使用电脑并不是导致身体衰退的主要原因。
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