【每日逻辑练习第二季】【1-3】

bananazoo

恩~很高兴看到这么多人参与进来~
真，美好~不是么~
大家加油！

跟帖做题方法请见：
http://forum.chasedream.com/GMAT_CR/thread-613902-1-1.html


【精练】
3. There is relatively little room for growth in the
overall carpet market, which is tied to the size of the
population. Most who purchase carpet do so only
once or twice, first in their twenties or thirties, and
then perhaps again in their fifties or sixties. Thus as
the population ages, companies producing carpet
will be able to gain market share in the carpet market
only through purchasing competitors, and not
through more aggressive marketing.
Which one of the following, if true, casts the most
doubt on the conclusion above?
--BIBLE WEAKEN NO.3
(A) Most of the major carpet producers market
other floor coverings as well.
(B) Most established carpet producers market
several different brand names and varieties,
and there is no remaining niche in the
market for new brands to fill.
(C) Two of the three mergers in the industry’s last
ten years led to a decline in profits and
revenues for the newly merged companies.
(D) Price reductions, achieved by cost-cutting in
production, by some of the dominant firms
in the carpet market are causing other
producers to leave the market altogether.
(E) The carpet market is unlike most markets in
that consumers are becoming increasingly
resistant to new patterns and styles.

【逻辑链】
2.
Scientists are discussing ways to remove excess carbon dioxide from the atmosphere by increasing the amount that is absorbed by plant life.  One plan to accomplish this is to establish giant floating seaweed farms in the oceans.  When the seaweed plants die, they will be disposed of by being burned for fuel.
Which of the following, if true, would indicate the most serious weakness in the plan above?
-- PREP07 CR1 NO.9

(A) Some areas of ocean in the Southern Hemisphere do not contain sufficient nutrients to support large seaweed farms.
(B) When a seaweed plant is burned, it releases an amount of carbon dioxide comparable to the amount it has absorbed in its lifetime.
(C) Even if seaweed farms prove effective, some people will be reluctant to switch to this new fuel.
(D) Each year about seven billion tons of carbon dioxide are released into the atmosphere but only about five billion tons are absorbed by plant life.
(E) Seaweed farms would make more money by farming seaweed to sell as nutritional supplements than by farming seaweed to sell as fuel.


3.
Jennifer:  Video rental outlets in Centerville together handled 10,000 fewer video rentals in 1994 than in 1993.  The decline in rentals was probably due almost entirely to the February 1994 opening of Videorama, the first and only video rental outlet in the area that, in addition to renting videos, also sold them cheaply.

Brad:  There must be another explanation:  as you yourself said, the decline was on the order of 10,000 rentals.  Yet Videorama sold only 4,000 videos in 1994.

Which of the following, if true, would most seriously weaken the force of the objection that Brad presents to Jennifer's explanation?
-- PREP07 CR1 NO.10
(A) In 1994 Videorama rented out more videos than it sold.
(B) In 1994 two new outlets that rent but that do not sell videos opened in Centerville.
(C) Most of the video rental outlets in Centerville rent videos at a discount on certain nights of the week.
(D) People often buy videos of movies that they have previously seen in a theater.
(E) People who own videos frequently loan them to their friends.


4.
Mourdet Winery:  Danville Winery's new wine was introduced to compete with our most popular wine, which is sold in a distinctive tall, black bottle.  Danville uses a similar bottle.  Thus, it is likely that many customers intending to buy our wine will mistakenly buy theirs instead.

Danville Winery:  Not so.  The two bottles can be readily distinguished:  the label on ours, but not on theirs, is gold colored.

Which of the following, if true, most undermines Danville Winery's response?
-- PREP07 CR1 NO.11
(A) Gold is the background color on the label of many of the wines produced by Danville Winery.
(B) When the bottles are viewed side by side, Danville Winery's bottle is perceptibly taller than Mourdet Winery's.
(C) Danville Winery, unlike Mourdet Winery, displays its wine's label prominently in advertisements.
(D) It is common for occasional purchasers to buy a bottle of wine on the basis of a general impression of the most obvious feature of the bottle.
(E) Many popular wines are sold in bottles of a standard design.


5.
Finding of a survey of Systems magazine subscribers:  Thirty percent of all merchandise orders placed by subscribers in response to advertisements in the magazine last year were placed by subscribers under age thirty-five.

Finding of a survey of advertisers in Systems magazine:  Most of the merchandise orders placed in response to advertisements in Systems last year were placed by people under age thirty-five.

For both of the findings to be accurate, which of the following must be true?
-- PREP07 CR1 NO.12
(A) More subscribers to Systems who have never ordered merchandise in response to advertisements in the magazine are age thirty-five or over than are under age thirty-five.
(B) Among subscribers to Systems, the proportion who are under age thirty-five was considerably lower last year than it is now.
(C) Most merchandise orders placed in response to advertisements in Systems last year were placed by Systems subscribers over age thirty-five.
(D) Last year, the average dollar amount of merchandise orders placed was less for subscribers under age thirty-five than for those age thirty-five or over.
(E) Last year many people who placed orders for merchandise in response to advertisements in Systems were not subscribers to the magazine.

MIA926

【精练】
3. There is relatively little room for growth in the overall carpet market, which is tied to the size of the population. Most who purchase carpet do so only once or twice, first in their twenties or thirties, and then perhaps again in their fifties or sixties. Thus as the population ages, companies producing carpet will be able to gain market share in the carpet market only through purchasing competitors, and not through more aggressive marketing.
Which one of the following, if true, casts the most doubt on the conclusion above?
--BIBLE WEAKEN NO.3
计时：29.66s
逻辑链：地毯市场的成长空间很小，因为这个市场主要依赖于人口的增长，人们一生中只会买几次地毯，而人口又在老龄化，所以生产地毯的企业只能通过收购竞争者而不是通过推广产品来在市场上抢占份额。
推测：除了这两种方法外还有别的方法可以gain share；
(A) Most of the major carpet producers market
other floor coverings as well. 无关 carpet才是讨论的要点
(B) Most established carpet producers market
several different brand names and varieties,
and there is no remaining niche in the
market for new brands to fill. 加强
(C) Two of the three mergers in the industry’s last
ten years led to a decline in profits and
revenues for the newly merged companies. 无关 结论在于要gain share而不是profit
(D) Price reductions, achieved by cost-cutting in
production, by some of the dominant firms
in the carpet market are causing other
producers to leave the market altogether. 正确 举出了别的gain share的方法
(E) The carpet market is unlike most markets in
that consumers are becoming increasingly
resistant to new patterns and styles. 无关 没有讲到gain share的事情

【逻辑链】
2.
Scientists are discussing ways to remove excess carbon dioxide from the atmosphere by increasing the amount that is absorbed by plant life.  One plan to accomplish this is to establish giant floating seaweed farms in the oceans.  When the seaweed plants die, they will be disposed of by being burned for fuel.
Which of the following, if true, would indicate the most serious weakness in the plan above?
-- PREP07 CR1 NO.9
逻辑链：为了减少大气中的二氧化碳，科学家计划在海洋中建立海草工厂来吸收二氧化碳，这些海草死后会通过燃烧的方式来销毁。
推测：死后燃烧放出的CO2比吸收的还要多
(A) Some areas of ocean in the Southern Hemisphere do not contain sufficient nutrients to support large seaweed farms. 无关 一些地方不能建不影响其他地方的效果
(B) When a seaweed plant is burned, it releases an amount of carbon dioxide comparable to the amount it has absorbed in its lifetime. 正确
(C) Even if seaweed farms prove effective, some people will be reluctant to switch to this new fuel. 无关 人们愿不愿意和有没有效无关
(D) Each year about seven billion tons of carbon dioxide are released into the atmosphere but only about five billion tons are absorbed by plant life. 无关 没有提到海草
(E) Seaweed farms would make more money by farming seaweed to sell as nutritional supplements than by farming seaweed to sell as fuel. 无关 海草公司怎样赚更多钱和能不能吸收CO2没关系


3.
Jennifer:  Video rental outlets in Centerville together handled 10,000 fewer video rentals in 1994 than in 1993.  The decline in rentals was probably due almost entirely to the February 1994 opening of Videorama, the first and only video rental outlet in the area that, in addition to renting videos, also sold them cheaply.
Brad:  There must be another explanation:  as you yourself said, the decline was on the order of 10,000 rentals.  Yet Videorama sold only 4,000 videos in 1994.
逻辑链：J说C这个地方的video的租用数量大幅下降是因为V这个店的开放，因为这个店除了租录像带外还会卖录像带，但是B反驳说应该还有其他原因导致的租用数量的下降，因为V只卖了4000但是数量下降了10000.
推测：一个人买了给别人看 所以没买的人也不用租了
Which of the following, if true, would most seriously weaken the force of the objection that Brad presents to Jennifer's explanation?
-- PREP07 CR1 NO.10
(A) In 1994 Videorama rented out more videos than it sold. 无关 没有阐明卖的和减少的的关系
(B) In 1994 two new outlets that rent but that do not sell videos opened in Centerville. 无关，讨论的是V这家店
(C) Most of the video rental outlets in Centerville rent videos at a discount on certain nights of the week. 无关，主要讲的是V卖的碟的问题
(D) People often buy videos of movies that they have previously seen in a theater. 无关 跟买什么样的碟没关系
(E) People who own videos frequently loan them to their friends. 正确


4.
Mourdet Winery:  Danville Winery's new wine was introduced to compete with our most popular wine, which is sold in a distinctive tall, black bottle.  Danville uses a similar bottle.  Thus, it is likely that many customers intending to buy our wine will mistakenly buy theirs instead.
Danville Winery:  Not so.  The two bottles can be readily distinguished:  the label on ours, but not on theirs, is gold colored.
逻辑链：M说D这个公司跟他们用一样的瓶子来装酒，这样客户要买M的酒的时候很可能错买成D的酒，D反驳说其实两种就很好区分，因为D公司的商标是金色的
推测：买酒的时候大家都是大概看一下就拿了，没人注意商标；金色的商标很不容易注意到；
Which of the following, if true, most undermines Danville Winery's response?
-- PREP07 CR1 NO.11
(A) Gold is the background color on the label of many of the wines produced by Danville Winery. 无关 跟其他D的酒没关系
(B) When the bottles are viewed side by side, Danville Winery's bottle is perceptibly taller than Mourdet Winery's. 加强D
(C) Danville Winery, unlike Mourdet Winery, displays its wine's label prominently in advertisements. 加强D
(D) It is common for occasional purchasers to buy a bottle of wine on the basis of a general impression of the most obvious feature of the bottle. 正确
(E) Many popular wines are sold in bottles of a standard design. 无关 讲别的酒去了


5.
Finding of a survey of Systems magazine subscribers:  Thirty percent of all merchandise orders placed by subscribers in response to advertisements in the magazine last year were placed by subscribers under age thirty-five.
Finding of a survey of advertisers in Systems magazine:  Most of the merchandise orders placed in response to advertisements in Systems last year were placed by people under age thirty-five.
逻辑链：第一个关于杂志订阅者的finding说百分之三十的来自对杂志广告有反应的订阅者的订单来自小于35岁的订阅者；第二个关于杂志广告商的finding表明：他们大不部分的对于广告有反应的订单来自小于35岁的人
For both of the findings to be accurate, which of the following must be true?
-- PREP07 CR1 NO.12
(A) More subscribers to Systems who have never ordered merchandise in response to advertisements in the magazine are age thirty-five or over than are under age thirty-five. 无关 是说百分之三十的订单来自35岁以下的订阅者 但很可能其他的订单来自35岁以上的人
(B) Among subscribers to Systems, the proportion who are under age thirty-five was considerably lower last year than it is now. 无关 跟人数对比无关
(C) Most merchandise orders placed in response to advertisements in Systems last year were placed by Systems subscribers over age thirty-five. 无关 跟题目给的信息无关 不能解决题目的问题
(D) Last year, the average dollar amount of merchandise orders placed was less for subscribers under age thirty-five than for those age thirty-five or over. 无关 和钱无关 在讲人的问题
(E) Last year many people who placed orders for merchandise in response to advertisements in Systems were not subscribers to the magazine. 正确

irenetopia

这个看了两分钟……不是全明白，一开始选的D，后来改的C……桑心
There is relatively little room for growth in theoverall carpet market, which is tied to the size of thepopulation. Most who purchase carpet do so onlyonce or twice, first in their twenties or thirties, andthen perhaps again in their fifties or sixties. Thus asthe population ages, companies producing carpetwill be able to gain market share in the carpet marketonly through purchasing competitors, and notthrough more aggressive marketing.Which one of the following, if true, casts the mostdoubt on the conclusion above?--BIBLE WEAKEN NO.3
逻辑链：因为人买的少，carpet市场小——扩大市场份额只能通过合并竞争对手而不是自己积极扩大市场份额
问削弱：通过自己的策略扩大市场份额

(A )Most of the major carpet producers marketother floor coverings as well.——无关吧，这个只是说了carpet producer出售的一个情况，无法削弱
(B) Most established carpet producers marketseveral different brand names and varieties,and there is no remaining niche in themarket for new brands to fill.——同A，无关
(C) Two of the three mergers in the industry’s lastten years led to a decline in profits andrevenues for the newly merged companies.——无关
(D) Price reductions, achieved by cost-cutting inproduction, by some of the dominant firmsin the carpet market are causing otherproducers to leave the market altogether.——bingo！学营销的居然一开始没看出来，这就是通过价格战略扩大市场份额
(E) The carpet market is unlike most markets inthat consumers are becoming increasinglyresistant to new patterns and styles.——无关

【逻辑链】2.
50S  
Scientists are discussing ways to remove excess carbon dioxide from the atmosphere by increasing the amount that is absorbed by plant life.  One plan to accomplish this is to establish giant floating seaweed farms in the oceans.  When the seaweed plants die, they will be disposed of by being burned for fuel.Which of the following, if true, would indicate the most serious weakness in the plan above?-- PREP07 CR1 NO.9
逻辑链：为了降低CD——所以在海上种S，S死后被焚烧
问削弱：目的是减少CD，只要找出S计划实施之后CD还是没有减少就可以
(A) Some areas of ocean in the Southern Hemisphere do not contain sufficient nutrients to support large seaweed farms.——跟CD减少无关啊
(B) When a seaweed plant is burned, it releases an amount of carbon dioxide comparable to the amount it has absorbed in its lifetime.——bingo!这样CD还是没有减少，计划失败
(C) Even if seaweed farms prove effective, some people will be reluctant to switch to this new fuel.——也不管CD什么事
(D) Each year about seven billion tons of carbon dioxide are released into the atmosphere but only about five billion tons are absorbed by plant life.——还是算是减少了对吧，属于suppor
t(E) Seaweed farms would make more money by farming seaweed to sell as nutritional supplements than by farming seaweed to sell as fuel.——也跟CD减少无关

3.
1 min
这个我也错了一开始，选的AJennifer:  Video rental outlets in Centerville together handled 10,000 fewer video rentals in 1994 than in 1993.  The decline in rentals was probably due almost entirely to the February 1994 opening of Videorama, the first and only video rental outlet in the area that, in addition to renting videos, also sold them cheaply.Brad:  There must be another explanation:  as you yourself said, the decline was on the order of 10,000 rentals.  Yet Videorama sold only 4,000 videos in 1994.
Which of the following, if true, would most seriously weaken the force of the objection that Brad presents to Jennifer's explanation?-- PREP07 CR1 NO.10

逻辑链：女：C在1994年销量下降了10000,因为另一个能租能卖又便宜的V营业了
男：有其他原因，因为94年V只卖了4000个
问削弱男的
思路：没有其他原因，就是因为V开了，找到填补6000的法子（原谅我逻辑一直很紊乱）
(A) In 1994 Videorama rented out more videos than it sold.——因为其他原因，理论上还是support了男的观点
(B) In 1994 two new outlets that rent but that do not sell videos opened in Centerville.——support男的
(C) Most of the video rental outlets in Centerville rent videos at a discount on certain nights of the week.——无语，无关
(D) People often buy videos of movies that they have previously seen in a theater.——也无关
(E) People who own videos frequently loan them to their friends.——bingo！解释了那6000去哪了，因为有的人买了videos借给朋友，可以填补6000的空缺

4.
1min
Mourdet Winery:  Danville Winery's new wine was introduced to compete with our most popular wine, which is sold in a distinctive tall, black bottle.  Danville uses a similar bottle.  Thus, it is likely that many customers intending to buy our wine will mistakenly buy theirs instead.Danville Winery:  Not so.  The two bottles can be readily distinguished:  the label on ours, but not on theirs, is gold colored.
Which of the following, if true, most undermines Danville Winery's response?-- PREP07 CR1 NO.11

逻辑链：MW：有个新的DW酒跟我们最popular的酒包装一样，消费者可能误选
DW：不会，因为我们的标签是金色哦
问削弱DW的
思路：肯定会让消费者误选即使是标签是金色的，也许是消费者不会管你标签是金色还是红色，他们对这个不感冒，只看大方向
(A) Gold is the background color on the label of many of the wines produced by Danville Winery.——无关
(B) When the bottles are viewed side by side, Danville Winery's bottle is perceptibly taller than Mourdet Winery's.——也无关
(C) Danville Winery, unlike Mourdet Winery, displays its wine's label prominently in advertisements.——细思极恐。。。这个的可持续影响等于是支持了DW的了，这里不讨论
(D) It is common for occasional purchasers to buy a bottle of wine on the basis of a general impression of the most obvious feature of the bottle.——bingo！消费者的关注点不在label上
(E) Many popular wines are sold in bottles of a standard design.——无关

5.
1min
Finding of a survey of Systems magazine subscribers:  Thirty percent of all merchandise orders placed by subscribers in response to advertisements in the magazine last year were placed by subscribers under age thirty-five.Finding of a survey of advertisers in Systems magazine:  Most of the merchandise orders placed in response to advertisements in Systems last year were placed by people under age thirty-five.For both of the findings to be accurate, which of the following must be true?-- PREP07 CR1 NO.12
逻辑链：去年35%杂志订购者对于杂志中广告订单的响应是35岁以下
去年我们大部分的杂志广告响应者实在35岁以下
问must be true，等于是吧响应者和订购响应者搭个桥，直接选E
(A) More subscribers to Systems who have never ordered merchandise in response to advertisements in the magazine are age thirty-five or over than are under age thirty-five.
(B) Among subscribers to Systems, the proportion who are under age thirty-five was considerably lower last year than it is now
(C) Most merchandise orders placed in response to advertisements in Systems last year were placed by Systems subscribers over age thirty-five.
(D) Last year, the average dollar amount of merchandise orders placed was less for subscribers under age thirty-five than for those age thirty-five or over.
(E) Last year many people who placed orders for merchandise in response to advertisements in Systems were not subscribers to the magazine.

anycoa

第一题我做错了。先开始选了B，因为忽略了结论是gain而不是确保当下的market share不会被侵蚀
然后我看懂题意后选了C，还是把market share 和revenue自动带入了。
最后认真考虑D，意识到这题的属性是目标导向题，也就是达到这个gain market share 的结果就好，不用太刻意区分在A或者B之间。

这题在我看来和前几天的彗星那道题很像：Although fullerenes--spherical molecules
因为在那道题的时候我的第一反应也是找另外一个能形成F的条件。
但是这两道题的区别在于类型不同，carpet 这道题是有be able to ，也就是目标第一，
而Fullernes那道题是说这个条件可以给地壳的形成条件做参照，是前提结论型，那就是要推翻前提为第一位。

Lincy123

bg: carpet market is tied to the size of pop
P: people buy carpet first in young age, then in old age.
C: carpet producers purchase competitor is the only way to gain carpet market share

Weaken: alternatives exist

a)        Floor covering is not carpet market. Irrelevant
b)        New brand comes in is irrelevant
c)        Mergers are in lost. Weaken. Correct
d)        Price war. Irrelevant
e)        New style is not welcome. Irrelevant.

又选错了选的C，C 说的合并常常不会成功，不成功不代表不是获得市占率的唯一方法；D说可以靠价格战获得市占率，是一种alternative，符合猜想

Bg: use plant to absorb co2
P: grow seaweed to absorb co2 and when seaweed die, burn them
C: remove excess co2

Weaken: the number of co2 that seaweed absorb is no more than it produce when it was burnt

a)        Other place can grow. Irrelevant
b)        Correct.
c)        Discuss the use of seaweed fuel. Irrelevant
d)        Not mention seaweed. Irrelevant
e)        People prefer selling seaweed as supplement. Irrelevant

Bg: video rentals is decline (10000) in 1994 than in 1993.
J think that is because V not only rent videos but also sold them cheaply
P: V only sold 4000 videos
C: J is wrong

Weaken: people buy videos can lend to others. People can rent one video more than one time

a)        Irrelevant
b)        Irrelevant
c)        Irrelevant
d)        Irrelevant
e)        Correct

Bg: M thinks that people mistakenly buy D’s wine because they use similar bottle
P’s wine has gold label but M dosen’t
C: the two bottles can be distinguished

Weaken: people don’t distinguish wine by label. People choose wine by bottles

a)        Repeat what D said.
b)        D’s bottle taller than M’s. irrelevant
c)        D’s label is known. Strengthen.
d)        People judge by general impression. Correct
e)        Irrelevant

Subscribers: 30% merchandise orders are placed by subscribers under 35 >>70% order by subscribers are >=35
Advertisers: most of merchandise orders in system are placed by people under 35

Must be true: ad is attractive by people under 35, many people under 35 are not subscribers

a)        Subscribers who do Not order merchandise are >=35. Not mention subscribers who never oder
b)        Subscribers who <35 is less than last yr. not mention this year
c)        Contradict to what advertisers said. Wrong
d)        Not mention dollar amount
e)        Correct

云栈

1.        42s
B: 地毯市场的发展空间很小，与人口size有关；大部分人一生只买两次地毯，一次在2-30岁，一次在5-60岁。
P：人口老龄化，要增加市场份额
C: 地毯市场只能通过购买竞争对手，而不是通过更aggressive 的marketing。话句话说如果市场份额增大，那么这个公司肯定购买了竞争对手。
推测：人口老龄化是按照比例来算的，从数量上来说年轻人可能比原来增加，所以市场营销依然有用；证明其他方法也能增长市场份额。
选项分析：D
A: 无关，题上说的是carpet的市场
B：opposite，简介表明市场饱和，新的营销方案可能没用
C：无关，题上说的是拓展市场份额，这里说的是profits和revenues；而且这个选项attack的是购买竞争对手会增大市场份额这一结论，这个结论和原题的因果颠倒了。
D：正确说明price reductions 作为一种more aggressive marketing是有用的
E: opposite, 同B
2.        26s
P：在海上种植一种死后可以被作为燃料燃烧的漂浮的海草
C: 海草可以 remove 大气层中excess的二氧化碳
推测：海草用作燃料燃烧的时候会产生大量二氧化碳
选项分析：B
3.        34s
P:1994年的video rental 比1993年少了10000.
C1：因为1994年开了一个Videorama，不光租还便宜卖
P: Videorama只卖了4000个videos，但是rental降低了10000.
C2：还有其他原因导致decrease.
推测：那些从Videorama买了videos的人可能会跟朋友share video.
选项分析：E
4.        26s
P: 某公司出产的新红酒和我们的最受欢迎的红酒使用了相似的bottle。
C：很多想买我们酒的顾客可能会买错成他们的。
P：我们的label是金色的，和他们不一样
C：not so
推测；顾客可能会觉得只要瓶身类似就是一个公司产的，不同的label仅代表不同版本，里面的酒是一样的。
选项分析；D 表明大部分顾客并不会注意到label这个点
5.        54s
P: 30%的通过杂志上的广告下单的订阅顾客的年龄在35以下。
P：大部分的通过杂志上广告下订单的顾客的年龄在35一下。
推测：很多看到杂志上广告而下订单的顾客并没有订阅这个杂志。
选项分析：E

yolo`

1 D 02:26
2 B 01:20
3 E 01:13
4 D 01:03
5 A 03:15----E
1. BG: the growth of carpet market is tied to the size of population
C: in order to gain market share, the only thing can be done is purchasing competitors instead of aggressive marketing
Weaken: the aggressive marketing can gain market share
2. BG: increasing plant to remove carbon
P1: seaweed absorb carbon
P2: seaweed need be burned when they die
Weakness: when they are burned, they might produce more carbon than that they absorb
3. J: C handled 10000 fewer rentals because V rent and sold
B: C decline 10000, V sold 4000
Weak: give reasons to explain why V sold such few videos but still lead to C decline
4. P1: similar bottle
P2: different colored label
Q: P1 cause more significant influence on customer than P1 do
5. P1: 30% of orders are placed by subscribers under 35
P2: 30% of orders are placed by people under 35
C: many people placing orders are not subscribers

喜皮

补昨天关于第一道题的解释
As you should have noted while reading, the conclusion contains a conditional indicator and is thereby conditional in nature.To attack a conditional statement you must show that the necessary condition is not actually necessary for the sufficient condition to occur.就是“只有……才”的题干，必须具备某条件才能成立的结论，这时候的反驳方法就是证明该条件并不能使其成立，或者说还有另外的条件。当然，前提是要知道到底是什么条件才能使其成立
2.--->29s
premise:in order to remove CO2
conclusion:the scientists have a plan that build a seedweed farm in the sea and the dead seedweed can burn to supply energy
prephrase:weaken--->the seedweed farm(plan) will not have any effect/will produce more CO2 than before.

Airrelevent
Bright
Cirrelevent
Dirrelevent.
Eirrelevent+support

3.--->43s
bg info:the rental decline about 10000
explanation1:because V rent and also sell cheaply so it occupy the market share the original one used to be
explanation2:not because of V, since V only rent 4000
prephrase:weaken explanation2--->it is V's charge/V's influence

Aright
Birrelevent
Cirrelevent
Dirrelevent
Eirrelevent
OA：E
错因：weaken point：exp2 think 10000 weighs more than 4000，就该点反驳，为什么数量小也能翻盘。其实在prephrase已经有了，就是V's influence is larger than rent。
*就算题目里面有关题目的名词一个字都没有提也不代表不相干！！

4.--->28s
explanation1---premiseur competitors' bottle shape is the same as us; conclusion: it is very likely that the customers will make mistakes.
explanation2---no.because our label on our bottle is gold, differing from theirs.prephrase:weaken explanation2--->although labels are different, the customers will also make mistake/the label is hard to identify

Akept for the first round.irrelevent
Birrelevent to explanation2
Csupport
Dright
Eirrelevent to other bottles

5.--->1m20s严重超时。。。
info1:a finding of subscriber shows that about 30% merchandise orders placed by subscribers who are under 35
info2:a finding advertiser shows that most of the merchandise order placed in response to the ad by people under 35
这两个信息太像了，分不清楚
Aright
Birrelevent
Cwrong
Dirrelevent
Eirrelevent

OA：E
错因：没读懂题目，info1---30% who placed order are subscribers that under 35. info2---most who placed order are under 35
E选项就是info2的改写
A选项因为不知道总人数，所以30%不能用

喜皮

1.--->37s
非常贴切的证明选选项一定要切合conclusion，不然分分钟掉进陷阱
premise:the customers are usually change carpets in the specific time of their life.
conclusion:so the carpet company can only earn money by purchasing other company but not marketing their products
bg info:the carpet company can hardly expand the market
prephrase:weaken--->the company can increase market share by marketing/purchaing other companies cant increase either.除了两种都不行之外，还有“另外一种方法这样的思路”

Akept for the first round.irrelevent to the carpet
Birrelevent to the new brands
Cirrelevent to the profit
Dright这是一个increase market share的另一种方法
Eirrelevent to the market share

gumgum330

BG：little room for growth carpet tied to population
      purchase seldom buy first  in 20/30 then 50/60
prmise: as population age
conclusion: regain share only through purchsing commpetior and not marketing
presume: purchasing competitior 不会有用 或者marketing 可以增加人们购买频率
(A) Most of the major carpet producers market
other floor coverings as well.----irrelevant
(B) Most established carpet producers market
several different brand names and varieties,
and there is no remaining niche in the
market for new brands to fill.----seemly strengthen
(C) Two of the three mergers in the industry’s last
ten years led to a decline in profits and
revenues for the newly merged companies.---seemly irrelevant because conclusion relates to share
(D) Price reductions, achieved by cost-cutting in
production, by some of the dominant firms
in the carpet market are causing other
producers to leave the market altogether. ---yes through strategy，others go out this we can gain some share
(E) The carpet market is unlike most markets in
that consumers are becoming increasingly
resistant to new patterns and styles. ----strengthen

plan:through seaweed farms to remove excess carbon dioxide
other infor: plants dies will be burnt
presume:when plants are brunt ,they will release comparable carbon


(A) Some areas of ocean in the Southern Hemisphere do not contain sufficient nutrients to support large seaweed farms.--some  以偏概全 不可以 irrelevant
(B) When a seaweed plant is burned, it releases an amount of carbon dioxide comparable to the amount it has absorbed in its lifetime.---yes 燃烧释放二氧化碳等于吸收的 结果约等于没有remove
(C) Even if seaweed farms prove effective, some people will be reluctant to switch to this new fuel.-some不等于所有 以偏概全irrelevant
(D) Each year about seven billion tons of carbon dioxide are released into the atmosphere but only about five billion tons are absorbed by plant life.--只有一部分能被吸收也能达到目的，但是和结论无关
(E) Seaweed farms would make more money by farming seaweed to sell as nutritional supplements than by farming seaweed to sell as fuel.-赚钱和move carbon无关

infor1:94年outlets比93年少10000，due to the openning of a selling store
infor2nly sell 4000
presume:those who bought video will lend vedio to friends several times
(A) In 1994 Videorama rented out more videos than it sold.  ---hold
(B) In 1994 two new outlets that rent but that do not sell videos opened in Centerville.--irrelevent
(C) Most of the video rental outlets in Centerville rent videos at a discount on certain nights of the week.--discount is irevelent to the conslusion
(D) People often buy videos of movies that they have previously seen in a theater.-irrelevent
(E) People who own videos frequently loan them to their friends.-seems better~ yes


infor1:dw new wine is similar to ours  so consumer will mistakenly buy theirs
infor2:dw is different in that label

weaken conclusion:consumer will not mistakenly buy dw
presume:this label will attract consumers attention

infor1:30%*merchandise orders in response to ad __subcriber under 35
infor2:most merchandise order in response to ad __under35
A) More subscribers to Systems who have never ordered merchandise in response to advertisements in the magazine are age thirty-five or over than are under age thirty-five. we dont know never ordered
(B) Among subscribers to Systems, the proportion who are under age thirty-five was considerably lower last year than it is now.----we donot konw this year
(C) Most merchandise orders placed in response to advertisements in Systems last year were placed by Systems subscribers over age thirty-five.--fasle  iin contrary to infor2
(D) Last year, the average dollar amount of merchandise orders placed was less for subscribers under age thirty-five than for those age thirty-five or over.--about money we dont know
(E) Last year many people who placed orders for merchandise in response to advertisements in Systems were not subscribers to the magazine. yes merchandise order= subscribe + not subcribe

echo-LUO

1. 削弱
B:There is relatively little room for growth in the
overall carpet market, which is tied to the size of the
population.
P:Most who purchase carpet do so only
once or twice, first in their twenties or thirties, and
then perhaps again in their fifties or sixties.
C:Thus as
the population ages, companies producing carpet
will be able to gain market share in the carpet market
only through purchasing competitors, and not
through more aggressive marketing.
猜想：别的方法；purchasing competitor也不行
C
正确答案：D

2.
B: One plan to accomplish this is to establish giant floating seaweed farms in the oceans.
P:When the seaweed plants die, they will be disposed of by being burned for fuel.
猜想：燃烧会增加二氧化碳，高于减少的
B

3. 削弱
B:Video rental outlets in Centerville together handled 10,000 fewer video rentals in 1994 than in 1993.  
P:as you yourself said, the decline was on the order of 10,000 rentals.  Yet Videorama sold only 4,000 videos in 1994.
C:There must be another explanation
猜想：sold的额度虽然小，但租的额度大；因为卖了，造成了更多影响
E

4. 削弱
B:it is likely that many customers intending to buy our wine will mistakenly buy theirs instead.
P:he two bottles can be readily distinguished:  the label on ours, but not on theirs, is gold colored.
C:不会弄混
猜想：不看lable和color
D

5. 晕哦
正确答案：E

gmat冲刺

精炼：D
1.计时37s
2. Premise：
There is relatively little rom for growth in the overall carpet market, which is tied to the size of the population. Most people only purchase carpet once or twice
Conclusion:
Companies producing carpets will only gain market share by purchasing their competitors
3.猜测：If the company can design greater carpet and attractive people, they can gain more cunstomers
4.选项分析
A. Irrelevant, what we discuss here is the market share
B.This choice strengthen the argument
C. Irrelevant, we don't concern about the profits
D.Correct! This choice gives an example to extend the market share by another way
E.Strength the argument!

逻辑链:
1、B
21s
Premise:
Remove excess carbon dioxide from the atmosphere
Conclusion:
Establish giant floating seaweed farms in the ocean
猜测：After the seaweed are burned , they will release the same amount of carbon dioxide as they absorb.
2、E
37s
Premise：
The decline was on the order of 10000 rentals, but V sold only 4000 videos in 1994
Conclusion:
There must be another explanation except the opening of V
猜测：People who bought videos from V may lend the videos to their frineds
3、D
25s
Premise:
The label on D is gold colored, which is different from M
Conclusion:
The two bottles can be readily distinguished
猜测：People don't pay attention to the label
4、E
55s
Premise:
One finding of subscribers says 30% are under age 35; one finding of advertisers says most are under age 35.
猜测：some people who place orders are not subscribers of the magzine