KD的GMAT疑惑之逻辑006

KingsDi

Surveys in Domorica indicate that only 10 percent of Domoricans in their twenties read a newspaper regularly, while
more than half of all Domoricans over thirty read a newspaper regularly. Although Domoricans in their twenties
constitute a large proportion of the population, newspaper publishers nonetheless predict that ten years from now,
the percentage of Domoricans who regularly read a newspaper will probably be no lower than it is today.


Which of the following, if true, provides the strongest grounds for the newspaper publishers’ prediction?

A. The number of Domoricans in their twenties is less than the number of Domoricans over thirty.
B. The number of newspapers in Domorica has been gradually increasing over the past several decades.
C. The proportion of Domoricans in their twenties who regularly read a newspaper has always been low.
D. The surveys defined a regular reader of a newspaper as someone who reads a newspaper more than twice a
week.
E. The proportion of Domoricans who regularly read a newspaper was higher 20 years ago than it is today.



这个选C...我读着感觉很是费解，因为对于这些百分数什么的有点晕...求NN指导！！！

sunyuwei

晓野的野 发表于 2013-10-5 01:32
20岁-30岁的规律读报纸的人，只占了其总人数的10%
30岁以上的人，规律读报纸的人，超过一半
尽管20来岁的人 ...

可以麻烦再问一下吗？
20多岁的人占得比例大，那么十年之后他们将会变成30多岁，再乘以一个大的比例，人数不是肯定会增加吗？强调20多岁的人少，到底有什么用啊？

KingsDi

突然发现...你睡得好晚...注意身体，同志

KingsDi

牛气  解释的非常详细~~~谢谢！！！！

晓野的野

20岁-30岁的规律读报纸的人，只占了其总人数的10%
30岁以上的人，规律读报纸的人，超过一半
尽管20来岁的人占了D地大量人口
但是不管怎样
10年后看报纸的人的比例大量提升

A原文就说了，20来岁的人占了人口很大的比例，不要攻击原文前提。（ 数字不重要，因为问的是比例，量大量少影响不到将来的比例关系）
B 无关，不管出报纸的人什么事
C 正确
D 常读报纸的定义 与原文结论无关
E 20年前的和现在无关，比较的是现在和10年后

C 的意思就是说20来岁常读报纸的人所占的比例本来就很少，那么当他们呢到30岁，就会规律阅读了，确保10年后常读报纸的人增多。
他为什么要说一直很少呢，只有之前越少，后来增大的可能性才会更大。

排除了不对和无关的，也能选出C
这个是manhattan的解释，说的也十分详细
http://www.manhattangmat.com/forums/cr-gmat-prep-t16050.html