这是我做XDF OLDBOOK时遇到的一道题，题目倒看的懂，但答案选A，看了半天也没明白A 选项的实际意思，否定词绕来绕去把我饶糊涂了，请高人指教
18. Researchers have found that when very overweight people, who tend to have relatively low metabolic rates, lose weight primarily through dieting, their metabolisms generally remain unchanged. They will thus burn significantly fewer calories at the new weight than do people whose weight is normally at that level. Such newly thin persons will, therefore, ultimately regain weight until their body size again matches their metabolic rate.
The conclusion of the argument above depends on which of the following assumptions?
(A) Relatively few very overweight people who have dieted down to a new weight tend to continue to consume substantially fewer calories than do people whose normal weight is at that level.
(B) The metabolisms of people who are usually not overweight are much more able to vary than the metabolisms of people who have been very overweight.
(C) The amount of calories that a person usually burns in a day is determined more by the amount that is consumed that day than by the current weight of the individual.
(D) Researchers have not yet determined whether the metabolic rates of formerly very overweight individuals can be accelerated by means of chemical agents.
(E) Because of the constancy of their metabolic rates, people who are at their usual weight normally have as much difficulty gaining weight as they do losing it.
題目說這些肥胖者減肥後在新陳代謝率仍然不變的情況下，會燃燒較少卡路里.所以直到體重
跟新陳代謝達到平衡前最終仍會胖回去，問假設的選項就排除任何與肥胖者無關的選項,B,C,E
可直接刪除,D所講的新陳代謝率是author的argument,不能說仍不確定,因為已經跳脫題目範圍
所以只剩A，說明很少的肥胖者在減肥後仍然攝取很少的食物，所以如果大部分肥胖者都仍然攝取
超過代謝率所能代謝的食物量，最終還是會復胖.這就是作者的假設。
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