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题库 / Prep2007E2-CR-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.
The conclusion of the argument above depends on which of the following assumptions?
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.
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.
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.
Researchers have not yet determined whether the metabolic rates of formerly very overweight individuals can be accelerated by means of chemical agents.
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.
F:节食的人，新陈代谢low，且unchanged
P:因为他们比正常人burn的卡路里少
C:所以还会变胖
burn和变胖---gap
因为，变胖需要consume-burn的剩余卡路里，所以需要知道他们的consume量
A：few 否定，很少人会在减肥后继续节食 consume继续少
即consume会增多，burn少，所以剩余一定多，变胖
B：rate已经说了low和unchanged，这里vary不vary无关
C：burn量取决于consume量，而不是体重----已经说了节食的胖子burn的少，所以取决于谁无所谓，还是不知道consume的量
D：rate加速，同B 无关
E:正常人，无关，题目是胖子会不会再发胖
MARK
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