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prep2-42
42.
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.超重的人新代慢，少吃减肥后，新代速度不变。所以比减肥后同重的新代快的人消耗的卡络里少，所以会更容易增肥到适应他们的慢代谢速度。
不变的量是新代的速度，作者说这些人因为代谢慢会渐渐变回原来那样胖，如果想不让他们变那么胖，那就需要接着少吃，因为他们的代谢速度是一定的。反之变胖前题是什么呢？就是他们没有接着少吃。
The conclusion of the argument above depends on which of the following assumptions? 要排除他因，也就是weaken的反向。
(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.通过结食瘦下来的人里很少有人会接着结食-即接着比正常人少吃。
(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.
我选的是E，现在看E其实是能加强新陈代谢速度作为胖瘦变化的直接原因，但是题里说新代速度是个恒量，所以E是无意义的。这样理解对吗？
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