GMAT逻辑解题技巧：Assumption题型总结(二).

　　GMAT逻辑考试的常见题型有哪几类?其对应的解题技巧又有哪些呢?本文将着重对GMAT逻辑考试中的常见题型及解题技巧深入的讲解，希望能够为考生备考GMAT逻辑考试带来帮助。

　　TN6-Q14：

　　Many people suffer an allergic reaction to certain sulfites, including those that are commonly added to wine as preservatives. However, since there are several wine makers who add sulfites to none of the wines they produce, people who would like to drink wine but are allergic to sulfites can drink wines produced by these wine makers without risking an allergic reaction to sulfites.

　　Which of the following is an assumption on which the argument depends?

　　照例还是先梳理题目条件：

　　(1)很多人对某种硫酸盐过敏，包括被广泛加入红酒作为防腐剂的一种硫酸盐

　　(2)但是有的厂商没有在他们制造的酒里面加硫酸盐

　　结论是：想喝酒但是又对硫酸盐过敏的酒友们可以购买上述厂商生产的红酒，这样就不用冒着过敏的危险偷偷喝酒了～

　　由本题来看，它的逻辑链相较于上一题比较完整，至少但看题目并没有很明显的缺失掉某一环，因此，这道题可以归入排除他因型。

　　本题的中心在于酒中的硫酸盐导致过敏，也就是说，这道题的前提是只要制造商不往酒里加硫酸盐，酒里面就不含有。因此，就不能出现以下的可能：酒里面本来就含有导致过敏的硫酸盐。

　　A. These wine makers have been able to duplicate the preservative fect produced by adding sulfites by means that do not involve adding any potentially allergenic substances to their wine.

　　本选项说的是上述厂商可以通过不加入任何的防腐物质来完美重现加入硫酸盐时的防腐效果(也就是：我啥防腐剂都不加，但是照样能保质!神马硫酸盐防腐剂都是浮云!)，算是个非常迷惑的选项，但是还是无法充分说明酒中本来就不含有硫酸盐。而且这个选项很明显属于转移焦点：题目的中心在于过不过敏，而不是防腐问题。

　　B. Not all forms of sulfite are equally likely to produce the allergic reactions.

　　本选项说不是所有的硫酸盐都一样的会导致过敏。题目里已经明确的说了加到酒里作为防腐剂的那一种是会导致过敏的，也就是说，本选项跟酒里含不含过敏硫酸盐会不会导致人家过敏根本就是木有任何关系，不该偷喝酒的人还是不能偷喝。

　　C. Wine is the only beverage to which sulfites are commonly added.

　　本选项说酒是唯一一种广泛加入硫酸盐来防腐的饮品，也就是说，喝酒会过敏的人就乖乖喝其他饮料吧!但是很可惜，这个选项还是无法证明酒里面只要不人工加硫酸盐就一定没有硫酸盐，因而属于题干补充资料，还是无关的那一种。

　　D. Apart from sulfites, there are no substances commonly present in wine that give rise to an allergic reaction.

　　本选项说除了硫酸盐就没有哪种酒里常见的物质会引起过敏的，还是不能说明酒里面没有天然含有的硫酸盐，因而同上一个选项，属于无关的题目补充资料。这个选项跟A一样比较具有迷惑性，大家看到的时候需要小心。

　　E. Sulfites are not naturally present in the wines produced by these wine makers in amounts large enough to produce an allergic reaction in someone who drinks these wines.

　　正解。本选项说上述厂商制造的酒里没有自然存在的硫酸盐，就算自然存在也没有多到可以引起过敏的地步，也就是说，只要不加，里面就没有。另外将这个选项取非的话，就是上述厂商制造的酒里面有自然存在的硫酸盐，还是多到可以引起过敏的程度，会削弱题目的结论。

　　练习：

　　TN7-Q40:

　　Agricultural societies cannot exist without staple crops. Several food plants, such as kola and okra, are known to have been domesticated in western Africa, but they are all supplemental, not staple, foods. All the recorded staple crops grown in western Africa were introduced from elsewhere, beginning, at some unknown date, with rice and yams. Therore, discovering when rice and yams were introduced into western Africa would establish the earliest date at which agricultural societies could have arisen there.

　　Which of the following is an assumption on which the argument depends?

　　A. People in western Africa did not develop staple crops that they stopped cultivating once rice and yams were introduced.

　　B. There are no plants native to western Africa that, if domesticated, could serve as staple food crops.

　　C. Rice and yams were grown as staple crops by the earliest agricultural societies outside of western Africa.

　　D. Kola and okra are better suited to growing conditions in western Africa than domesticated rice and yams are.

　　E. Kola and okra were domesticated in western Africa bore rice and yams were introduced there.

　　TN16-Q38:

　　Because it was long thought that few people would watch lengthy televised political messages, most televised political advertisements, like commercial advertisements, took the form of short messages. Last year, however, one candidate produced a half-hour-long advertisement. During the half hour the advertisement was aired, a substantial portion of the viewing public tuned into the advertisement. Clearly, then, many more people are interested in watching lengthy televised political messages than was previously thought.

　　Which of the following is an assumption on which the argument depends?

　　A. The candidate’s ratings improved significantly as a result of the half-hour-long political advertisement.

　　B. Political advertisements have become increasingly influential in determining voters’ decisions at the polls.

　　C. Many people would appreciate the opportunity to become better acquainted with political candidates’ views on current political issues.

　　D. Most people who are interested in political issues watch television regularly.

　　E. Most of the viewers who tuned in to the candidate’s half-hour-long advertisement last year did not change channels after the first few minutes.

　　以上内容对GMAT逻辑考试中的常见题型及解题技巧进行了详细的讲解，考生可以根据文中重点进行针对性的练习，掌握并熟练应用GMAT逻辑试题的解题思路，从而在GMAT考试中取得好成绩。 相关链接：

1.GMAT逻辑解题技巧：Assumption题型总结(一)

2.GMAT考试真人秀：广州考场体验

3.GMAT数学备考指导：常用理论小结

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