2011GRE考试：阅读难句解读7

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3. 优缺点强对比
这类题的特点是，题干中如果问某事物、著作、人怎样会变得更好，但是在原文中没有给出明确的回答，而一般会有相反的内容，即：该事物、著作、人因为什么原因现在还不够好。这样，将其取非，就可以得到原题的答案。这里需要注意一点，有时文章细节复杂，被问到的事物缺点不止一个，那么一定要找到题干所问内容的缺点，而不要被其他的缺点乱了思路。
2 T" N4 ^. L2 U7 ]  l& A& H; x下面再用一个例子取说明(仍然是上一篇文章，这里就不重负文章内容了)：
, b. R) u' n5 S6 \1 b2 k8 ~7 CIt can be inferred from the passage that a historian who wished to compare crime rates per thousand in a European city in one decade of the fifteenth century with crime rates in another decade of that century would probably be most aided by better information about which of the following?
) \9 v7 ^! _1 C8 e; x(A) the cause of unrest in the city during the two decades
8 W  J* N  d8 Z: }! X, A. g( e3 H/ B(B) the aggregate number of indictments in the city nearest to the city under investigation during the two decades
7 u. o% x0 l/ R/ M5 w+ v' G(C) the number of people who lived in the city during each of the decades under investigation
) r. J7 I. o* ~% s* ?(D) the mental attitudes of criminals in the city, including their feedings about authority, during each of the decades under investigation
(E) the possibilities for a member of the city’s non-elite to become a member of the political and social elite during the two decades
分析：
6 f( T9 x: t9 X4 k, i' x6 R* p" D题干比较长，意思是“比较两个10年的犯罪率，得到了以下哪个信息，将会最有帮助？”，在原文中有提到，两个10年的犯罪率经常无法进行比较，原因是总人口数的估计不准确。所以，根据这一信息，将其取非，便得出了选项C是正确的。即“要研究的两个10年内城市人口的统计数”。