新gre红宝书：argument26
GRE作文是中国学生比较头痛的，经常准备很多时间最后还是只得到3.5。我之所以得到6分，个人认为我的文风比较淳朴扎实，有科学性，写的思路比较广(正、反、特)，字数也比较多(I800+、A700+)。
题目：
"Salicylates are members of the same chemical family as aspirin， a medicine used to treat headaches. Although many foods are naturally rich in salicylates， for the past several decades， food-processing companies have also been adding salicylates to foods as preservatives. This rise in the commercial use of salicylates has been found to correlate with a steady decline in the average number of headaches reported by participants in our twenty-year study. Recently， food-processing companies have found that salicylates can also be used as flavor additives for foods. With this new use for salicylates， we can expect a continued steady decline in the number of headaches suffered by the average citizen of Mentia."
Write a response in which you discuss what specific evidence is needed to evaluate the argument and explain how the evidence would weaken or strengthen the argument.
中文翻译：
水杨酸酯和用来治疗头痛的药物——阿司匹林是同一类化合物。尽管很多食品天然富含水杨酸酯，过去几十年中食品加工公司仍然在食品中加入它来作为防腐剂。这种水杨酸酯在商业上的使用被发现与我们为期20年研究的参加者所报告的头痛发病的平均数量下降是相关的。最近，食品加工公司发现水杨酸酯也可以被用作食品香料。根据这种水杨酸酯的新用途，我们可以预期Mentia居患头痛症的数量将会持续稳步下降。
原文来源： 新gre红宝书：argument26
写一篇回应，讨论还需要何种具体的证据才能更好的评估上面的论证，并解释这个证据是如何强化/削弱这篇文章的论证的。
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