1. 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.
what is assumption?
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.
why is A correct?
2. In tests for p, a serious disease, a false positive result indicates that people have p when, in fact, they do not; a false negative result indicates taht people do not have p when, in fact, ehy od. To detect p most accurately, physicians should use the lab test that has the lowest proportion of false positive results.
which gives most support to the recommendation above?
A. The accepted treatment for p does not have damaging side effects.
C. In teating p patients, it is essential to begin treatment as early as possible, since even a week of delay can result in loss of life.
E all lab tests to detect p have the same proportion of false negative results.
which one?作者: justag 时间: 2003-1-7 12:18
I don't agree with the first problem.
The second one's ans is E, I think. If A, then false positive results don't hurt much, why to restrict them to the lowest proportion? If C, false negative results will bring disastrous effects, why not address the false negative proportion at all? Only E, clears the doubts.
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