GMAT逻辑题练习及答案
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GMAT逻辑真题题目一:
【逻辑】
Plant scientists have used genetic engineering on seedsto produce crop plants that are highly resistant to insect damage. Unfortunately,the seeds themselves are quite expensive, and the plants require morefertilizer and water to grow well than normal ones. Thus, for most farmers the savings on pesticideswould not compensate for the higher seed costs and the cost of additionalfertilizer. However, since consumer demand for grains, fruits, and vegetables grownwithout the use of pesticides continues to rise, the use of geneticallyengineered seeds of this kind is likely to become widespread.
In the argument given, the two portions in boldface play which of the followingroles?
(A) The first supplies a context for the argument; thesecond is the argument's main conclusion.
(B) The first introduces a development that the argumentpredicts will have a certain outcome; the second is a state of affairs that theargument denies will be part of that outcome.
(C) The first presents a development that the argumentpredicts will have a certain outcome; the second acknowledges a considerationthat weighs against that prediction.
(D) The first provides evidence to support a predictionthat the argument seeks to defend; the second is that prediction.
(E) The first and the second each provide evidence tosupport the argument's main conclusion.
答案
【逻辑】
参考答案: C
思路：However后面与作者立场一致, However前面与作者立场相反。
A：排除;因为The frist应该与argument立场相反
B：排除，因为the second is a state of affairs that the argument denies错了. The second应该与argument的立场一致.
D：排除，因为The first应该与作者立场相反;
E：排除，因为The first应该与作者立场相反;
C：第一句话是argument预测的一个结果. 预测就有可能支持或反对; 第二句话反对了预测的东西,也就是反对一句话。没有什么错, 不能排除.
GMAT逻辑真题题目二:
【逻辑】
Astronomer: Observations of the Shoemaker-Levi comet onits collision course with Jupiter showed that the comet broke into fragmentsbefore entering Jupiter's atmosphere in 1994, but they did not show how bigthose fragments were. In hopes ofgaining some indication of the fragments' size, astronomers studiedspectrographic analyses of Jupiter's outer atmosphere. These analyses revealed unprecedented tracesof sulfur after the fragments' entry.Thefragments themselves almost certainly contained no sulfur, but many astronomersbelieve that the cloud layer below Jupiter's outer atmosphere does containsulfur. Since sulfur would haveseeped into the outer atmosphere if comet fragments had penetrated this cloudlayer, it is likely that some of thefragments were at least large enough to have passed through Jupiter's outeratmosphere without being burned up.
In the astronomer's argument, the two portions in boldface play which of the followingroles?
(A) The first presents a circumstance for which theastronomer offers an explanation; the second is part of that explanation.
(B) The first acknowledges a consideration that weighsagainst the conclusion of the argument; the second is that conclusion.
(C) The first acknowledges a consideration that weighsagainst the conclusion of the argument; the second provides evidence in supportof that conclusion.
(D) The first provides evidence in support of theconclusion of the argument; the second acknowledges a consideration that weighsagainst that conclusion.
(E) The first is a judgment advanced in support of theconclusion of the argument; the second is that conclusion.
GMAT逻辑真题答案:
参考答案: E
思路：A：排除，因为它说第二句话是Part of that explanation;
B：排除，因为选项中有反对之意的against;
C：排除，因为选项中有反对之意的against;
D：排除，因为选项中有反对之意的against;
E：没有什么不对的地方，不能排除，正确答案。
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