GMAT邏輯真題練習及答案2017

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　　【邏輯】

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

【邏輯】

　　參考答案: C

思路：However後面與作者立場一致, However前面與作者立場相反。

A：排除;因爲The frist應該與argument立場相反

B：排除，因爲the second is a state of affairs that the argument denies錯了. The second應該與argument的立場一致.

D：排除，因爲The first應該與作者立場相反;

E：排除，因爲The first應該與作者立場相反;

C：第一句話是argument預測的`一個結果. 預測就有可能支持或反對; 第二句話反對了預測的東西,也就是反對一句話。沒有什麼錯, 不能排除.

　　【邏輯】

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' ragments 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邏輯真題答案:

參考答案: E

思路：A：排除，因爲它說第二句話是Part of that explanation;

B：排除，因爲選項中有反對之意的against;

C：排除，因爲選項中有反對之意的against;

D：排除，因爲選項中有反對之意的against;

E：沒有什麼不對的地方，不能排除，正確答案。