觅高人

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 majors 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

答案是C，谁能给于一个解释，万分感激。

North American children who are obese:North American children who are not obese=15:85

so if the number of North American children who are obese is steadily increasing, then we can also know that the number of North American children who are not obese is increasing. The answer C.

oh,the first sentence means a ratio.

how stupid am i...

by the way, 3ku