7月31日 GMAT数学逻辑每日一练

　　7月31日 GMAT数学逻辑每日一练

　　【数学】

　　Is the sum of the integers x and y a prime number?

　　(1) x is an even prime number.

　　(2) y is a prime number between10 and 20.

　　A. Statement (1) ALONEis sufficient, but statement(2) alone is not sufficient.

　　B. Statement (2) ALONEis sufficient, but statement(1) alone is not sufficient.

　　C. BOTH statements TOGETHERare sufficient,but NEITHERstatement ALONEis sufficient.

　　D. EACHstatement ALONEis sufficient.

　　E. Statements (1) and (2) TOGETHERare NOTsufficient.

　　【逻辑】

　　The public in the United States has in the past beenconditioned to support a substantial defense budget by the threat ofconfrontation with the Eastern bloc. Now that that threat is dissolving, alongwith the Eastern bloc itself, it is doubtful whether the public can bepersuaded to support an adequate defense budget.

　　Which one of the following indicates a weakness in theposition expressed above?

　　A. It presupposesthat public opinion can be manipulated indefinitely, without the public’sbecoming aware of that manipulation.

　　B. It refers to pastand present events that do not have a causal connection with public support ofthe budget.

　　C. It assumes asfact what it seeks to establish by

　　D. It fails to giveany reason for the judgment it reaches.

　　E. It hinges on theterm “adequate”, the precise meaning of which requires reevaluation in the newcontext.

　　答案

　　【数学】

　　参考答案：E

　　题目翻译：x和y的和是不是质数？

　　题目全解：(1)2 is the only prime even number. We don't know what Y is. Insufficient;

　　(2)Y can be 11,13,... We don't know what X is. Insufficient;

　　Together,2+11 = 13 Prime; 2+13 = 15 not Prime. Insufficient.

　　Hence E.

　　【逻辑】

　　参考答案:E

　　思路：

　　A. 不关题意

　　B. 错误, causal connection文中有

　　C. 无

　　D. 错误, reason文中有

　　E. 因为在开始文中只提到a substantial defense budget , 而后面却说的是support an adequate defense budget. “adequate”在这里是一个概念很模糊的词,因为很多可以说成adequate,而很少也可以说成adequate, 这主要看被要求的情况.并且public有可能不支持很大数量的defense budget,却有可能支持很小数量的defense budget.

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