请教费费宝典—114 题！

cindyschu

请教大家：
114. The number of North American children who are obese-that is who have more body fat than do 85 percent of North American children their age -is steadily increasing, according to four major studies conducted over the past 15 years.

If the finding reported above is correct, it can be properly concluded that

(A) when four major studies all produce similar results .those studies must be accurate.

(B) North American children have been progressively less physically active over the past 15 years.

(C) The number of North American children who are not obese increased over the past 15 years.

(D) Over the past 15 years ,the number of North American children who are underweight has declined.

(E) The incidence of obesity in North American children tends to increase as the children grow older.

答案：c . 不知道为什么？谢谢！

StephanieYun

数量和比例







生活是一杯清茶

回家过年

infer题，排除
A:没有提及four studies 与结果的must正确。
B：也属于没有道理的推论
C：根据胖子比起85％增加，总量肯定也增加，所以不胖的也增加。
D：瘦子减少，不能得出该结论。
E:虽年龄增长，不能推出。

归纳题：充分必要条件，逆否命题，对比推理等（见陈向东）
主意与中心思想题的区别。