下面再用一个例子取说明：

　　It 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?

　　 the cause of unrest in the city during the two decades

　　 the aggregate number of indictments in the city nearest to the city under investigation during the two decades

　　 the number of people who lived in the city during each of the decades under investigation

　　 the mental attitudes of criminals in the city, including their feedings about authority, during each of the decades under investigation

　　 the possibilities for a member of the citys non-elite to become a member of the political and social elite during the two decades

　　分析：

　　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。

　　小结：

　　综上所述，强对比取非题在GRE阅读中出现频率也是很高的，如果掌握了这类题的解答思路，在作答时就会迎刃而解了。

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