8.事实上所有产业，技术的更新会提高生产率，也就是每小时的产品产出或者服务。在P的行业中，生产率明显比V高。所以，很明显，P的整体科技水平比V高。
削弱
A：结论只是提供支持信息的一部分的改写
B：提供了一段证据来支持声明，但是与其他支持的信息不一致
C：把其中一个可能的情况作为了真正的原因，忽视了其他可能的原因
D：把一个状况作为了一个已经发生的状况的影响
E：把一个要建立结论的前提区分了开来
8. In virtually any industry, technological improvements increase labor productivity, which is the output of goods and services per person-hour worked. In Parland's industries, labor productivity is significantly higher than it is in Vergia's industries. Clearly, therefore, Parland's industries must, on the whole, be further advanced technologically than Vergia's are.[S1]
The argument is most vulnerable to which of the following criticisms?
(A) It offers a conclusion that is no more than a paraphrase of one of the pieces of information provided in its support[S2] .
(B) It presents as evidence in support of a claim information that is inconsistent with other evidence presented in support of the same claim[S3] .
(C) It takes one possible cause of a condition to be the actual cause of that condition without considering any other possible causes[S4] .
(D) It takes a condition to be the effect of something that happened only after the condition already existed[S5] .
(E) It makes a distinction that presupposes the truth of the conclusion that is to be established[S6] .
题干很简单，其实就是个充分必要条件，原命题是：技术更新à生产效率提高，但是结论是这个命题的逆命题：生产效率高à技术水平高。道理很简单，原命题对，逆命题不一定对。也就是说，充分条件是：科技水平提高，必要条件是：生产率提高。充分条件有很多，但是必要条件只有一个。答案就在这点上，只是，GMAT比较贱的就是题干简单，就容易在选项上给人造成理解的困难。只要牢牢记住从题干分析中得到的信息，不要被选项搞混乱了。
答案：C
9. 当很多人认为基因工程改造粮食作物的目的是开发出越来越大的植物时，一些种子生产商却在集中开发生产低矮的作物，可能只有正常作物的一半高。
解释
A：粮食作物又是被用来作为装饰
B：供给增加整体价格下跌
C：原先只供给人类消费的作物现在也用来喂养动物
D：低矮的植物更少受到大风大雨的伤害
E：工业发达的过夜倾向于消费更多的加工品
9. While many people think of genetic manipulation of food crops as being aimed at developing larger and larger plant varieties, some plant breeders have in fact concentrated on discovering or producing dwarf varieties, which are roughly half as tall as normal varieties.
Which of the following would, if true, most help to explain the strategy of the plant breeders referred to above?
(A) Plant varieties used as food by some are used as ornamentals by others[S7] .
(B) The wholesale prices of a given crop decrease as the supply of it increases[S8] .
(C) Crops once produced exclusively for human consumption are often now used for animal feed[S9] .
(D) Short plants are less vulnerable to strong wind and heavy rains[S10] .
(E) Nations with large industrial sectors tend to consume more processed grains[S11] .
解释题，先找到分歧点矛盾点。这题的分歧点就是植物的高矮的问题，为什么会有人开发低矮的作物呢?肯定是低矮的作物有不可替代的优势。
答案：D
10. T城市的委员会想减少交通灯的每年耗费，因此想等IB用坏了，就把IB换成LED。与IB相比，LED耗电又少、又便宜。而且，把现有设备换为LED的费用极小。
评价
A：LED寿命是否比IB长?
B：是否有城市把IB换成了其他，而非LED?
C：卖IB的公司是否也卖LED?
D：T城的委员会是否计划增加交通灯?
E：以前换灯的工人是否知道怎么把IB换成LED?
10. (OG12-07) Traverton’s city council wants to minimize the city’s average yearly expenditures on its traffic signal lights and so is considering replacing the incandescent bulbs currently in use with arrays of light-emitting diodes (LEDs) as the incandescent bulbs burn out. Compared to incandescent bulbs, LED arrays consume significantly less energy and cost no more to purchase. Moreover, the costs associated with the conversion of existing fixtures so as to accept LED arrays would be minimal.
Which of the following would it be most useful to know in determining whether switching to LED arrays would be likely to help minimize Traverton’s yearly maintenance costs[c12] ?
(A) [c13] Whether the expected service life of LED arrays is at least as long as that of the currently used incandescent bulbs A
(B) Whether any cities have switched from incandescent lights in their traffic signals to
lighting elements other than LED arrays[c14]
(C) Whether the company [c15] from which Traverton currently buys incandescent bulbs for traffic signals also sells LED arrays
(D) Whether Traverton’s city council plans to increase the number[c16] of traffic signal lights in
Traverton
(E) Whether the crews that currently replace incandescent bulbs in Traverton’s traffic signals know how to convert[c17] the existing fixtures so as to accept LED arrays
评价题，答案的给出的这个问题的存在与否肯定可以同时加强&削弱题干，这点首先要明确好。同时，问题中出现了这道题需要评价的关键信息：Minimize Traverton’s yearly maintenance costs，抓住这点去思考答案方向。是不是使用成本低，更换的费用可以可以忽略不计，是不是真的就包括
备注：
[S1]结论
[S2]结论是一个逆命题，和改写不相关
[S3]没有很多ecidence，只有一个推论，无关
[S4]科技水平提高肯定能使生产效率提高，但是生产效率高，不代表科技水平一定高，有其他条件制约，正确
[S5]无关
[S6]无关
[S7]没提到低矮作物的特点，无关
[S8]价格，无关
[S9]喂养动物，无关
[S10]低矮作物的特点，正解
[S11]工业，无关
[c12]因果型结论
[c13]取非对结论weaken
[c14]无关
[c15]无关
[c16]无关
[c17]无关
您还可能关注：
