求教prep-2-42！

jinxiao_6

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.

答案选A。题目看了好找时间没明白作者到底在讲什么！

Howto

这个题目是这个意思，超重的人有低的新陈代谢率，他们降低体重通过减少摄入食物，但是他们的新陈代谢率不会改变。当体重减轻后，他们还是会比本来是那个体重的人消耗低的卡路里。因此，所以这些人最终还会增加体重到和他们新陈代谢率相匹配的body size 。

问假设！

其实就这个意思，比方说本来一个人150斤，他新陈代谢率是每天自然消耗50卡路里。他通过减肥以后变成120斤，但是本来120斤的人每天自然消耗的卡路里是100卡。所以那些150斤的人最终还是会增加到150斤（和他们消耗50卡相匹配的卡路里）。

A说很少的那些超重的人会继续摄入少的卡路里的食物比那些正常人。（取非就是那些减少体重后的人会会继续吃很少卡路里的食物。这样就可以削弱原文，因为你吃进去的减去新陈代谢掉的就是剩下的，依据文中说因为我比普通人新城代谢的少所以我就摄入的少，那么我的体重还是会保持在那个新的水平）。

B说那些不偏重的人新陈代谢率更加可能变化。（文中没有说到新陈代谢变化无关）

C人们每天燃烧的卡路里更由他们吃的决定而不是现在的体重。(这个本身可以削弱，取非后就不能了所以错。是干扰项)

D科学家到现在还没有发现是否那些以前超重的人新陈代谢率可以增加通过什么东西。（无关）

E因为新陈代谢率的关系，那些增肥和减肥一样困难（这个也无关，取非对原文没有任何关系）