大全-Ⅲ-19.

大全-Ⅲ-19.
                Identical twins tend to have similar personalities; if environment outweighs heredity in personality development, twins raised together should presumably have more similar personalities than those raised apart. A recent study of identical twins in both situations measured 11 key traits through a questionnaire, and concluded that 7 of the 11 are primarily products of heredity.

Which of the following, if established, would cast the most doubt on the study’s results?

(A) Fewer than half of the pairs of twins studied were raised separately.

(B) The ages of all of the twins studied fell within a 10-year range. x

(C) Some of the traits that the study attributed to heredity developed in the separately raised twins because those pairs all grew up in similar families.

(D) Although over half the traits measured were determined to be linked to heredity, the nature of those traits varied widely.（C）

(E) The 11 traits that were measured constitute a representative sample of larger, generally accepted pool of key personality traits.

求教这题的A为什么不对？

文章就是在讲述twins的成长环境比遗传更加重要。。那么这个问卷调查却得出了遗传的特征回答的人占多数，那么我weaken的就是这群调查的twins一半以上的人不是raised separtaely，有错吗？

赐教，谢谢。。

我觉得A的问题出在 fewer than half,比较题干中的 7of 11,这两组数字的对比是有问题的，试想：11对twins中有4对raised separately,那么得出7of 11这样的结论有意义吗？

当然是Cthe separately raised twins because those pairs all grew up in similar families.更直接地weaken, 基本上出现数字对比的选项都不会对。

lz mm觉得呢？