老题目了没搞懂，弄懂的同学来解释下

棒棒dudu · 发表于 2010-8-17 06:27:00

12. 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.

sindyxu2009 · 发表于 2010-8-17 07:45:49

12. 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.

-- by 会员棒棒dudu (2010/8/17 6:27:00)

觉得选C。因为对于obese的定义是和同年龄人比较后按百分比算的，就是说obese的孩子永远只占全部孩子的15%，所以，当obese的孩子数量增加时，即孩子总数增加，所以not obese的孩子（总数的85%部分）的数量也增加了。

lcj2003kit · 发表于 2010-8-17 16:21:17

同意楼上的。。。。。。

gdpltw1 · 发表于 2010-8-17 16:42:30

12. 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

文中的主干是 The number of North American children is steadily increasing. 是上升的变化的，选项也应该是变化的，所以从cde中选。文中无提及年龄的变化，所以e不选；文中只说了more body fat的变化，并不能直接得出underweight的变化，所以排除d；所以c应该是正确选项。
“根据过去十五年四项主要研究调查表明，北美肥胖儿童，也就是比85%的同龄人拥有更多的体内脂肪的儿童，的数量正在稳定的增长。”也就是说北美儿童的的数量正在增长，比例不变，数量增长，总数也增长，所以，不肥胖的儿童数量也增长了。

我觉得是C，以上是个人想法zZ~Z~

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老题目了 没搞懂， 弄懂的同学来解释下

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老题目了没搞懂，弄懂的同学来解释下