狒狒114

114. Thenumber of North American children who are obese-that is, who have more body fatthan do 85 percent of North American children their age---is steadilyincreasing, according to four major studies conducted over the past 15 years.

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

(A) when fourmajors studies all produce similar results, those studies must be accurate

(B) North Americanchildren have been progressively less physically active over the past 15 years

(C) the number ofNorth American children who are not obese increased over the past 15 years

(D) over the past15 years, the number of North American children who are underweight hasdeclined

(E) the incidenceof obesity in North American children tends to increase as thechildren grow older

楼主知道只有选项CD有关，可是原题也没有显示什么百分比啊， 难道说有85%的儿童这个比例是固定的吗，求解惑~

根据过去十五年的四项调查，北美肥胖儿童的数量（也就是体内脂肪比85%的同龄人要多的儿童）正在稳步增长。

C 过去十五年，北美不肥胖儿童的数量增长
D 过去十五年， 北美不肥胖儿童的数量下降