纠结于一道Layer逻辑(Assumption)

cristina2

173. 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.  

A 是答案，提干没读懂，逻辑链更不用谈。

kingapple25

原文：节食减肥的人变瘦后新陈代谢仍然和减肥前一样，比正常人消耗更少的卡路里，所以，这些人会重新胖起来
A：几乎没什么减肥成功的人会比正常人摄入更少的卡路里---也就是说他们和正常人摄入的一样多，但是却比正常人消耗少（原文），所以会重新胖起来（结论）

lxw19

题干就是说肥胖的人体内新陈代谢的速度比较低，那么消耗的卡路里也就相对来说少一些。在这些肥胖的人通过节食的方式减肥并且瘦下来的情况下，体内新陈代谢的速度并没有跟着提高，也就是说那些通过节食减肥的人们所消耗的卡路里还是比正常情况下该体重的人要少，因此并不会永远保持减肥后的效果。。

A选项排出了一种使结论不成立的可能，如果节食减肥后的人们又重新开始正常进食，从而导致了体重的反弹，那么显然就不是因为新陈代谢的速度与体重的不成比例造成的，所以A把这种可能性给排出了

不知道我解释的是否清楚。。。。

cristina2

非常感谢楼上两位大侠，偶明白了。

奋斗GMAT中

consume这个词我觉得一楼理解的好啊，消耗我理解成了所以很纠结，而你理解成了摄入，牛

侯子的西游记

多谢楼上同学们的分析，特别是一楼的同学！