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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.

Ans: a

I am a little confused by this question. For my understanding, "burn significantly fewer calories" means "消耗较少的calories", which definitly regain weight.

For choice (a), "consume substantially fewer calories" that means "dieting" or "消费更少的calories".

Light suggested A选项取非验证，亦即，很多超重的人在减重成功之后，会持续节食，消耗较少的calories.→所以他们不会复胖，与conclusion矛盾→亦即，若选项A不存在，则此conclusion也不存在，所以选项A为此题的必要assumption.

有点小错误, 消耗较少的calories, ----->应该是消耗更多的calories 吧

Cocoabean said "有点小错误, 消耗较少的calories, ----->应该是消耗更多的calories 吧" However, I don't think here is a mistake since I only get 消耗较少的calories from the question "they will this burn significantly few calories that".

My question is "消耗较少的calories.→所以他们会复胖"? 与conclusion不矛盾 AFTER A选项取非验证, which is different with following explanation posted before by Light

http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=28139 Light suggested A选项取非验证，亦即，很多超重的人在减重成功之后，会持续节食，消耗较少的calories.→所以他们不会复胖，与conclusion矛盾→亦即，若选项A不存在，则此conclusion也不存在，所以选项A为此题的必要assumption.

我想是这样的，你对A中的consumer的理解有误，在这里不是“消耗”的意思，而是“摄入”的意思。

这样对A取非就成为：很多超重的人在减重成功之后，会持续节食，比正常体重的人摄入较少的calories。

楼上分析的是正确的，consume不是消耗，而是“消费的”，意即吃进去的意思

以下是引用zt_lby在2007-10-4 22:29:00的发言：

楼上分析的是正确的，consume不是消耗，而是“消费的”，意即吃进去的意思