【每日逻辑练习第二季】【1-7】

采药去

C--->选D premise and conclusion 都搞反了
C
B
C
D

实习上班 理由今天就暂时不写了

spencerchan

50’’ 第一遍没看懂，又看了一遍，哎。。
P: 95% DNA samples taken from the Baja turtles match those taken from turtles at the Japanese nesting sites
C: Juvenile Pacific loggerheads that feed near the Baja Peninsula hatch in Japanese waters
Prep: The same sample =/ hatch in the same place
D: CORRECT
A: WEAKEN??, I am not sure
B: Strengthen
C: Irrelevant
E: Irrelevant

45’’
P: In order to increase export size
C: The government should make currency go weak
Prep: Making currency go weak would lead serious issues
C: CORRECT
A: Irrelevant
B: Irrelevant
D: Irrelevant
E: This option provides other way, but it does not weaken the politician’s recommendation

1’09’’
P: Sanitation improved and the immigration has continued
C: The city’s population growth has not significant accelerated
Prep: Old people died?
B: CORRECT
A: Weaken? Frankly, I cannot understand the meaning…
C: Irrelevant
D: Immigration has continued increase, so people immigrate to other cities includes in the amount
E: Irrelevant

47”
B: Scientists plan to produce a high resistant crop plants
P: The cost to grow the new crop is higher than pesticide cost
P: BUT, customer prefer the new crop
C: The new crop would be wide used
C: CORRECT

44’’
B: The first buying customers prefer lower profit margin computer than the customers replace their computer
P: This year’s profit is higher than last year
P: same number of computer was sold and the profit margin and the price of each computer did not change
Prep: More people buy computers for replacing
D: CORRECT
A: Weaken
B: Irrelevant
C: Irrelevant
E: Profit margin does not change

不能第一遍读懂题干很致命，或者就是选项理解错误，继续加油～

MIA926

CR小分队20150831-7
Loggerhead turtles live and breed in distinct groups, of which some are in the Pacific Ocean and some are in the Atlantic. New evidence suggests that juvenile Pacific loggerheads that feed near the Baja Peninsula hatch in Japanese waters 10,000 kilometers away. Ninety-five percent of the DNA samples taken from the Baja turtles match those taken from turtles at the Japanese nesting sites.
Which one of the following, if true, most seriously weakens the reasoning above?
计时：26.34s
逻辑链：90% of the DNA samples of B turtles match those of the Japanese ones——》 B turtle hatch in Japanese water.
(A) Nesting sites of loggerhead turtles have been found the Pacific coast of North America Several thousand kilometers north of the Baja peninsula. 无关
(B) The distance between nesting sites and feeding sites of Atlantic loggerhead turtles is less than 5,000 kilometers. 无关
(C) Loggerhead hatchlings in Japanese waters have been declining in number for the last decade while the number of nesting sites near the Baja peninsula has remained constant. 无关
(D) Ninety-five percent of the DNA samples taken from the Baja turtles match those taken from Atlantic loggerhead turtles. 正确
(E) Commercial aquariums have been successfully breeding Atlantic loggerheads with Pacific loggerheads for the last five years. 无关

【逻辑链】
25. (30261-!-item-!-188;#058&004144)
Twelve years ago and again five years ago, there were extended periods when the Darfir Republic's currency, the pundra, was weak:  its value was unusually low relative to the world's most stable currencies.  Both times a weak pundra made Darfir's manufactured products a bargain on world markets, and Darfir's exports were up substantially.  Now some politicians are saying that, in order to cause another similarly sized increase in exports, the government should allow the pundra to become weak again.
逻辑链：以前weak currency increase sales of product——》to increase exports should let the currency become weak again.
方案：政策实施会有其他不良的后果；类比推理结果不对，以前和现在情况有所不同；
Which of the following, if true, provides the government with the strongest grounds to doubt that the politicians' recommendation, if followed, will achieve its aim?
(A) Several of the politicians now recommending that the pundra be allowed to become weak made that same recommendation before each of the last two periods of currency weakness. 加强
(B) After several decades of operating well below peak capacity, Darfir's manufacturing sector is now operating at near-peak levels. 正确
(C) The economy of a country experiencing a rise in exports will become healthier only if the country's currency is strong or the rise in exports is significant. 无关economy
(D) Those countries whose manufactured products compete with Darfir's on the world market all currently have stable currencies. 无关
(E) A sharp improvement in the efficiency of Darfir's manufacturing plants would make Darfir's products a bargain on world markets even without any weakening of the pundra relative to other currencies. 无关 提到了其他方法 但没有讲到这个政策为什么不好


26. (31045-!-item-!-188;#058&004365)
The population of Megacity, a sprawling metropolis in Remsland, has grown at a fairly steady rate for over a century.  A hundred years ago, poor sanitation in the city caused high mortality rates among the city's inhabitants, and what fueled the population increase was immigration from rural villages.  This immigration has continued and even increased.  Moreover, in recent decades, city sanitation has improved enormously.  Yet the city's population growth has not significantly accelerated.
逻辑链：以前poor sanitation caused high mortality rates, immigration fueled the population increase——》now more immigration and better sanitation but population growth has not accelerated
Which of the following, if true, most helps to explain why the city's population growth rate has not changed?
(A) Mortality rates that were associated with poor sanitation in Megacity a hundred years ago were orders of magnitude higher than are mortality rates associated with vehicular traffic, which is currently a major cause of death in the city. 算是增强吧…
(B) For several decades, Megacity, as distinct from the countryside, has had a steadily declining birth rate. 正确 生的少了 虽然死的也少了 移民的也增加了 但是略抵消了 所以不加速
(C) Cities smaller than Megacity have also experienced sustained population growth. 无关
(D) The great majority of immigrants to Remsland settle in Megacity, at least initially. 无关
(E) Megacity has long offered better employment prospects than most rural areas. 无关


27. (31231-!-item-!-188;#058&004411)
Plant scientists have used genetic engineering on seeds to produce crop plants that are highly resistant to insect damage.  Unfortunately, the seeds themselves are quite expensive, and the plants require more fertilizer and water to grow well than normal ones.  Thus, for most farmers the savings on pesticides would not compensate for the higher seed costs and the cost of additional fertilizer.  However, since consumer demand for grains, fruits, and vegetables grown without the use of pesticides continues to rise, the use of genetically engineered seeds of this kind is likely to become widespread.
In the argument given, the two portions in boldface play which of the following roles?
(A) The first supplies a context for the argument; the second is the argument's main conclusion. 正确
(B) The first introduces a development that the argument predicts will have a certain outcome; the second is a state of affairs that the argument denies will be part of that outcome. 错
(C) The first presents a development that the argument predicts will have a certain outcome; the second acknowledges a consideration that weighs against that prediction. 错
(D) The first provides evidence to support a prediction that the argument seeks to defend; the second is that prediction. 错
(E) The first and the second each provide evidence to support the argument's main conclusion. 错


28. (31510-!-item-!-188;#058&004526)
First-time computer buyers buying PXC home computers typically buy models that cost much less and have a smaller profit margin per computer than do PXC computers bought by people replacing their computers with more powerful models.  Last year PXC's profits from computer sales were substantially higher than the previous year, although about the same number of PXC computers were sold and the prices and profit margins for each computer model that PXC sells remained unchanged.
逻辑链：第一次买电脑的人的利润比替换电脑的人的低； profit增加，但是数量和价格和每台电脑的边际利润没变
If the statements above are true, which of the following is most strongly supported by them?
(A) PXC's competitors raised the prices on their computers last year, making PXC computers more attractive to first-time computer buyers.无关
(B) The number of people buying PXC computers who also bought PXC computer-related products, such as printers, was larger last year than the previous year. 反前提
(C) Among computer buyers who bought a PXC computer to replace their existing computer, the proportion who were replacing a computer made by a competitor of PXC was greater last year than the previous year. 无关
(D) The proportion of PXC computers bought by first-time computer buyers was smaller last year than the previous year. 正确
(E) PXC's production costs for its computers were lower last year than they had been the previous year. 反前提

啊云苏苏

1-7-1-weaken
1)计时：36.97（看懂了，可找不到逻辑关系）
分析：原来我逻辑链都搞错了。。。
P-BT和JT有95%的dna相似
C-BT在超级远的地方hatch
gap-很多生物的dna都很相似；juvenile怎么能游10000km这么远
逻辑链整清楚就明白为什么选D了
A irrelevant
B irrelevant
C irrelevant
D bingo！
E irrelevant

1-7-2-weaken
1)计时：58.93
2）逻辑链：
-P
两次P大幅度贬值，产品价格↓，D国出口↑
-C
为了↑D国出口，应该再让P贬值
3）Prephrase
重点该放在，即便货币贬值商品价格下降，在国际市场上也没有竞争力
4)选项分析：
A irrelevant
B（right，生产部门已经到顶峰了，货币再怎么贬值，export也没有多少上升空间了）
C irrelvant
D support
E（是个推测，不是事实，不能用来攻击结论）
选B

1-7-3-explain
1)计时：44.98
2）逻辑链：
-B
近百年P稳定增长
百年前，PS导致了↑MR，I导致了P↑
-P
I在持续↑，PS也变好了，但P没有多多少
3）Prephrase
人口老龄化；也有很多人搬走；经历了战争；出生率下降
4)选项分析：
A 不懂。。。
B bingo！
C irrelevant
D opposite
E irrelevant

1-7-4-boldface
1)计时：43.97
2）逻辑链：
-P1
EE的cost很高
-P2
noP'D↑，EE可能会普及
3）Prephrase
1是一个事实，2是可以忽略1的原因
4)选项分析：
A no
B no
C yes
D no
E no

1-7-5-support
1)计时：36.57
2）逻辑链：
-B
第一次买的人会买成本比较低的型号，利润也比较少；换电脑的人就会买更好的型号，利润也更高
-C
PXC's profits from computer sales↑，但数量，价格，PM都没变
-gap
那是什么促使利润↑？第一次买的人少了，换电脑的人多了
4)选项分析：
A opposite，销量没变
B 讨论的是电脑的利润
C irrelevant
D（right，总销量没变，但换电脑的人多了，第一次买的人少了）
E（边际利润没变，所以成本没变）
第一句话要读懂！！！

kexiner

1-7
【精练】
  Loggerhead turtles live and breed in distinct groups, of which some are in the Pacific Ocean and some are in the Atlantic. New evidence suggests that juvenile Pacific loggerheads that feed near the Baja Peninsula hatch in Japanese waters 10,000 kilometers away. Ninety-five percent of the DNA samples taken from the Baja turtles match those taken from turtles at the Japanese nesting sites.
Which one of the following, if true, most seriously weakens the reasoning above?
逻辑链： L乌龟live和breed在不同的group，一些在P洋，一些在大西洋。新证据显示juvenile的P乌龟feed靠近BAJA 半岛，在J洋中孵化。 95%DNA样本与在J nesting 地点的乌龟符合。
结论：New evidence suggests that juvenile Pacific loggerheads that feed near the Baja Peninsula hatch in Japanese waters 10,000 kilometers away.
weaken

Nesting sites of loggerhead turtles have been found the Pacific coast of North America Several thousand kilometers north of the Baja peninsula.

(B) The distance between nesting sites and feeding sites of Atlantic loggerhead turtles is less than 5,000 kilometers.
(C) Loggerhead hatchlings in Japanese waters have been declining in number for the last decade while the number of nesting sites near the Baja peninsula has remained constant.
(D) Ninety-five percent of the DNA samples taken from the Baja turtles match those taken from Atlantic loggerhead turtles.
同样与A洋的吻合 说明不是在P洋的？
RIGHT
(E) Commercial aquariums have been successfully breeding Atlantic loggerheads with Pacific loggerheads for the last five years.
【逻辑链】
25. (30261-!-item-!-188;#058&004144)
Twelve years ago and again five years ago, there were extended periods when the Darfir Republic's currency, the pundra, was weak:  its value was unusually low relative to the world's most stable currencies.  Both times a weak pundra made Darfir's manufactured products a bargain on world markets, and Darfir's exports were up substantially.  Now some politicians are saying that, in order to cause another similarly sized increase in exports, the government should allow the pundra to become weak again.
逻辑链：20年前，当D国的汇率 PUNDRA很低时，它的价值不寻常的低于世界上最稳定的货币。当时，D国产的东西很值得买在世界市场上，andD国的出口量也很大。 现在，一些政客说，为了导致相同的效果增大出口，政府应当允许货币p再次贬值。


Which of the following, if true, provides the government with the strongest grounds to doubt that the politicians' recommendation, if followed, will achieve its aim?
Several of the politicians now recommending that the pundra be allowed to become weak made that same recommendation before each of the last two periods of currency weakness.
与lats periods currency weakness无关
(B) After several decades of operating well below peak capacity, Darfir's manufacturing sector is now operating at near-peak levels.
operating无关
--there is no space to have a increase in export--weaken--right
(C) The economy of a country experiencing a rise in exports will become healthier only if the country's currency is strong or the rise in exports is significant.

(D) Those countries whose manufactured products compete with Darfir's on the world market all currently have stable currencies.
其他国家无关
(E) A sharp improvement in the efficiency of Darfir's manufacturing plants would make Darfir's products a bargain on world markets even without any weakening of the pundra relative to other currencies.
right
--a improvement in the efficiency--irrelevant
26. (31045-!-item-!-188;#058&004365)
The population of Megacity, a sprawling metropolis in Remsland, has grown at a fairly steady rate for over a century.  A hundred years ago, poor sanitation in the city caused high mortality rates among the city's inhabitants, and what fueled the population increase was immigration from rural villages.  This immigration has continued and even increased.  Moreover, in recent decades, city sanitation has improved enormously.  Yet the city's population growth has not significantly accelerated.
Which of the following, if true, most helps to explain why the city's population growth rate has not changed?
M城市的人口，一直以很慢的增长速度生长。 100年前，poor卫生导致了高死亡率，导致了人口增长的是迁移到了rural villiages。 这种迁移一直在继续。 而且，在最近几十年，城市卫生提高了很多。然而城市人口增长率没有显著提升。
Mortality rates that were associated with poor sanitation in Megacity a hundred years ago were orders of magnitude higher than are mortality rates associated with vehicular traffic, which is currently a major cause of death in the city.
right
we should pay attention to the word ‘currently’, however, in the original text, it is ‘recent decades’
(B) For several decades, Megacity, as distinct from the countryside, has had a steadily declining birth rate.
这种decline不一定大于增长
Correct
(C) Cities smaller than Megacity have also experienced sustained population growth.
其他小城市无法对比
(D) The great majority of immigrants to Remsland settle in Megacity, at least initially.

(E) Megacity has long offered better employment prospects than most rural areas.
27. (31231-!-item-!-188;#058&004411)
Plant scientists have used genetic engineering on seeds to produce crop plants that are highly resistant to insect damage.  Unfortunately, the seeds themselves are quite expensive, and the plants require more fertilizer and water to grow well than normal ones.  Thus, for most farmers the savings on pesticides would not compensate for the higher seed costs and the cost of additional fertilizer.  However, since consumer demand for grains, fruits, and vegetables grown without the use of pesticides continues to rise, the use of genetically engineered seeds of this kind is likely to become widespread.
In the argument given, the two portions in boldface play which of the following roles?

The first supplies a context for the argument; the second is the argument's main conclusion.

(B) The first introduces a development that the argument predicts will have a certain outcome; the second is a state of affairs that the argument denies will be part of that outcome.
(C) The first presents a development that the argument predicts will have a certain outcome; the second acknowledges a consideration that weighs against that prediction.
right
(D) The first provides evidence to support a prediction that the argument seeks to defend; the second is that prediction.
(E) The first and the second each provide evidence to support the argument's main conclusion.

28. (31510-!-item-!-188;#058&004526)
First-time computer buyers buying PXC home computers typically buy models that cost much less and have a smaller profit margin per computer than do PXC computers bought by people replacing their computers with more powerful models.  Last year PXC's profits from computer sales were substantially higher than the previous year, although about the same number of PXC computers were sold and the prices and profit margins for each computer model that PXC sells remained unchanged.
If the statements above are true, which of the following is most strongly supported by them?
逻辑链：第一次购买电脑的买家买P电脑时倾向于买那些花费少和比更小的边际利润的model
卖出的数量一样的 价格和边际利润也都相同
PXC's competitors raised the prices on their computers last year, making PXC computers more attractive to first-time computer buyers.

(B) The number of people buying PXC computers who also bought PXC computer-related products, such as printers, was larger last year than the previous year.
文中说computer的profit提高 没有提及printer
(C) Among computer buyers who bought a PXC computer to replace their existing computer, the proportion who were replacing a computer made by a competitor of PXC was greater last year than the previous year.

(D) The proportion of PXC computers bought by first-time computer buyers was smaller last year than the previous year.
right 总量不变 其中的成分含量变化
(E) PXC's production costs for its computers were lower last year than they had been the previous year.
The price and profit margin do not change

Geranium_Bayy

Loggerheadturtles live and breed in distinct groups, of which some are in the PacificOcean and some are in the Atlantic. New evidence suggests that juvenile Pacificloggerheads that feed near the Baja Peninsula hatch in Japanese waters 10,000kilometers away. Ninety-five percent of the DNA samples taken from the Bajaturtles match those taken from turtles at the Japanese nesting sites.

Which one of thefollowing, if true, most seriously weakens the reasoning above?

Background information: LT live in distinct groups.

Premise: LT hatch in Japanese waters & 95% DNAmatch that

Conclusion: LT live in Japanese waters

Weaken: the statistics of 95% can’t say anything./other places also as same as or even larger than 95% DNA match.  

(A) Nestingsites of loggerhead turtles have been found the Pacific coast of North AmericaSeveral thousand kilometers north of the Baja peninsula. Irrelevant

(B) The distancebetween nesting sites and feeding sites of Atlantic loggerhead turtles is lessthan 5,000 kilometers. Irrelevant

(C) Loggerheadhatchlings in Japanese waters have been declining in number for the last decadewhile the number of nesting sites near the Baja peninsula has remainedconstant. Irrelevant

(D) Ninety-fivepercent of the DNA samples taken from the Baja turtles match those taken fromAtlantic loggerhead turtles. Correct

(E) Commercialaquariums have been successfully breeding Atlantic loggerheads with Pacificloggerheads for the last five years. Irrelevant

25.(30261-!-item-!-188;#058&004144)

Twelve years agoand again five years ago, there were extended periods when the DarfirRepublic's currency, the pundra, was weak: its value was unusually low relative to the world's most stable currencies.  Both times a weak pundra made Darfir'smanufactured products a bargain on world markets, and Darfir's exports were upsubstantially.  Now some politicians aresaying that, in order to cause another similarly sized increase in exports, thegovernment should allow the pundra to become weak again.

Background: the currency of D country was weaken twice and during these period itsexport went well.

Premise: the weaken currency results in the boom export.

Conclusion: In order to cause another similar increasein export, the government should allow its currency to become weaken again.

Weaken: 1、there areother factors that cause such an increase. And the weaken currency is an accidentalevent

2、there is a dramatic change over theglobal economical environment, and the weaken currency is not useful any more.

3、there is no room for manufacture todevelop.

Which of thefollowing, if true, provides the government with the strongest grounds to doubtthat the politicians' recommendation, if followed, will achieve its aim?

(A) Several ofthe politicians now recommending that the pundra be allowed to become weak madethat same recommendation before each of the last two periods of currencyweakness. Strengthen

(B) After several decades ofoperating well below peak capacity, Darfir's manufacturing sector is nowoperating at near-peak levels. Correct,the manufacturing sector is at peak, even though the government weak thecurrency, there is no more extra increase.

(C) The economyof a country experiencing a rise in exports will become healthier only if thecountry's currency is strong or the rise in exports is significant. Irrelevant, we do not talk aboutthe healthy economy.

(D) Thosecountries whose manufactured products compete with Darfir's on the world marketall currently have stable currencies. Irrelevantcomparison

(E) A sharpimprovement in the efficiency of Darfir's manufacturing plants would makeDarfir's products a bargain on world markets even without any weakening of thepundra relative to other currencies. We stilldon’t know what will happen if P is weaken.

26.(31045-!-item-!-188;#058&004365)

The populationof Megacity, a sprawling metropolis in Remsland, has grown at a fairly steadyrate for over a century.  A hundred yearsago, poor sanitation in the city caused high mortality rates among the city'sinhabitants, and what fueled the population increase was immigration from ruralvillages.  This immigration has continuedand even increased.  Moreover, in recentdecades, city sanitation has improved enormously.  Yet the city's population growth has notsignificantly accelerated.

Which of thefollowing, if true, most helps to explain why the city's population growth ratehas not changed?

Background information: the mortality in the countryand immigration from rural areas compensated its declining people. And theimmigration people is continued to increase.

Premise: the total population will increaseeventually

Conclusion: the city’s population has not increased.

Explanation: there are other factors affect thepopulation, such as birth rate.

(A) Mortalityrates that were associated with poor sanitation in Megacity a hundred years agowere orders of magnitude higher than are mortality rates associated withvehicular traffic, which is currently a major cause of death in the city.Irrelevant, we do not talk about the cause oftraffic.

(B) For several decades,Megacity, as distinct from the countryside, has had a steadily declining birthrate. Correct.

(C) Citiessmaller than Megacity have also experienced sustained population growth. Irrelevant comparison & strengthen

(D) The greatmajority of immigrants to Remsland settle in Megacity, at least initially. Beyond scope

(E) Megacity haslong offered better employment prospects than most rural areas. We do not talk about employment.

27.(31231-!-item-!-188;#058&004411)

Plant scientists have used genetic engineeringon seeds to 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 thesavings on pesticides would not compensate for the higher seed costs and thecost of additional fertilizer.  However,since consumer demand for grains, fruits, and vegetables grown without the useof pesticides continues to rise, the use of genetically engineered seeds ofthis kind is likely to become widespread.

In the argumentgiven, the two portions in boldface play which of the following roles?

(A) The firstsupplies a context for the argument; the second is the argument's mainconclusion.

(B) The firstintroduces a development that the argument predicts will have a certainoutcome; the second is a state ofaffairs that the argument denies will be part of that outcome.

(C) The first presents adevelopment that the argument predicts will have a certain outcome; the secondacknowledges a consideration that weighs against that prediction.

(D) The firstprovides evidence to support a prediction that the argument seeks to defend;the second is that prediction.

(E) The firstand the second each provideevidence to support the argument's main conclusion.

28.(31510-!-item-!-188;#058&004526)

First-timecomputer buyers buying PXC home computers typically buy models that cost muchless and have a smaller profit margin per computer than do PXC computers boughtby people replacing their computers with more powerful models.  Last year PXC's profits from computersales were substantiallyhigher than the previous year, although about the same number of PXCcomputers were sold and the prices and profit margins for each computer modelthat PXC sells remained unchanged.

If thestatements above are true, which of the following is most strongly supported bythem?

Background: first-time computer buyers buy computer modelscheaper than those who want to replace the computer. 2、theprofit is larger than previous year. 3、there areno change in the number , the price, and the profit of computers.

(A) PXC's competitors raised the prices ontheir computers last year, making PXC computers more attractive to first-timecomputer buyers. We don’t know the outcome of the option:making PXC more attractive.  If this is true, then the numberof computers sole by PXC last year should increase.

(B) The numberof people buying PXC computers who also bought PXC computer-related products,such as printers, was larger last year than the previous year.  We don’ttalk about computer-related products. Also, they can buy it last year andprevious year, whatever.

(C) Amongcomputer buyers who bought a PXC computer to replace their existing computer,the proportion who were replacing a computer made by a competitor of PXC wasgreater last year than the previous year. We don’tknow the exact number.

(D) The proportion of PXCcomputers bought by first-time computer buyers was smaller last year than theprevious year. First-time users buylow-price models for PXC computers, while people who replace their computerswill buy high-price models. correct

(E) PXC'sproduction costs for its computers were lower last year than they had been theprevious year.

hedyail

D7 错2对3，放下速度后，准确率有所提升，不过boldface题看答案后还是有点不太懂

精炼
BG:Some of L live in P,others in A
PRE:95% of DNA samples taken from Baja L match those L at Japanese nesting sites
CON:juvenile PL hatch in Japan
WEAKEN

(A) Nesting sites of loggerhead turtles have been found the Pacific coast of North America Several thousand kilometers north of the Baja peninsula. - not related
(B) The distance between nesting sites and feeding sites of Atlantic loggerhead turtles is less than 5,000 kilometers. - not related, it is about AL
(C) Loggerhead hatchlings in Japanese waters have been declining in number for the last decade while the number of nesting sites near the Baja peninsula has remained constant. - about hatchling,not related
(D) Ninety-five percent of the DNA samples taken from the Baja turtles match those taken from Atlantic loggerhead turtles. - 如果都匹配的话，可能就跟Japan没关系了？
(E) Commercial aquariums have been successfully breeding Atlantic loggerheads with Pacific loggerheads for the last five years. -not realted
T 58s
D

逻辑链
T1 40s
PRE:12 years and 5 years ago, the currency of P was weak. And both times exports were up.
CON:the value should be weak in order to cause increase in exports
猜想：other factors push exports; have some drawbacks when the value go down
E B有点像，ACD无关  b

T2 30s
BG:100 years ago, the city has poor sanitation and higher mortality rates. City increases its poplutaion by immigration of rural people.
PRE:Now better sanitation system and increased immigration
CON:The city's population remain the same growht rate
猜想:local people move to other cities
EXPLAIN
B CDE排除，A迷惑，但不说明死亡率下降

T3 40s
PRE:the seed can help produce crop plants that are resistant to insect damage. But the seed and further fertilizer and water are expensive. Farmers seldonm buy.
PRE:consumer want plants without the use of pesticides
CON:Use of seeds will become widespread
BOLDFACE
A c

T4 1:11min
PRE:First-time buyers buy cheaper PXC models, which have smaller profit margin.
PREast year PXC profit is higher, although same number were sold and price unchanged
Support
D

AstridHua

向各位大神提个问题
第28题我第一次做的时候选了d，但是再研究逻辑链的时候觉得d有点问题。
题目中说about the same number of PXC computers were sold and the prices and profit margins for each computer model that PXC sells remained unchanged，如果d选项正确，那么买smaller profit margin models 的少于powerful models（which assumed to be"higher profit margin models), 则在电脑售价相同，数量相同的情况下，总的profit margin会提高啊，d选项不就和原文给出的premise不相符了么？
求解！谢谢大神！

宋痂岛__

BBBCD
第一题做错了

May97

T: 25s
Loggerhead turtles live and breed in distinct groups, of which some are in the Pacific Ocean and some are in the Atlantic. --->background
New evidence suggests that juvenile Pacific loggerheads that feed near the Baja Peninsula hatch in Japanese waters 10,000 kilometers away. --->conclusion
Ninety-five percent of the DNA samples taken from the Baja turtles match those taken from turtles at the Japanese nesting sites.--->Premise
Weaken: Baja turtules are not loggerheads
(A) Nesting sites of loggerhead turtles have been found the Pacific coast of North America Several thousand kilometers north of the Baja peninsula.--->irreverent.在其他地方存在nesting sites, 不代表loggerheads 不在日本 hatch
(B) The distance between nesting sites and feeding sites of Atlantic loggerhead turtles is less than 5,000 kilometers.--->irreverent
(C) Loggerhead hatchlings in Japanese waters have been declining in number for the last decade while the number of nesting sites near the Baja peninsula has remained constant.--->直接说了loggerhend hatch in Japanese
(D) Ninety-five percent of the DNA samples taken from the Baja turtles match those taken from Atlantic loggerhead turtles.--->Correct
(E) Commercial aquariums have been successfully breeding Atlantic loggerheads with Pacific loggerheads for the last five years. --->irreverent

25. T: 44s
Twelve years ago and again five years ago, there were extended periods when the Darfir Republic's currency, the pundra, was weak:  its value was unusually low relative to the world's most stable currencies.--->background  
Both times a weak pundra made Darfir's manufactured products a bargain on world markets, and Darfir's exports were up substantially. --->premise
Now some politicians are saying that, in order to cause another similarly sized increase in exports, the government should allow the pundra to become weak again.--->conclusion
Weaken:
(A) Several of the politicians now recommending that the pundra be allowed to become weak made that same recommendation before each of the last two periods of currency weakness.--->irreverent
(B) After several decades of operating well below peak capacity, Darfir's manufacturing sector is now operating at near-peak levels.--->correct
(C) The economy of a country experiencing a rise in exports will become healthier only if the country's currency is strong or the rise in exports is significant.--->irreverent
(D) Those countries whose manufactured products compete with Darfir's on the world market all currently have stable currencies.--->support
(E) A sharp improvement in the efficiency of Darfir's manufacturing plants would make Darfir's products a bargain on world markets even without any weakening of the pundra relative to other currencies.--->irreverent

26. T: 34s
The population of Megacity, a sprawling metropolis in Remsland, has grown at a fairly steady rate for over a century. --->background
A hundred years ago, poor sanitation in the city caused high mortality rates among the city's inhabitants, and what fueled the population increase was immigration from rural villages.--->premise  
This immigration has continued and even increased.  Moreover, in recent decades, city sanitation has improved enormously.--->premise  
Yet the city's population growth has not significantly accelerated.--->conclusion
EP:
(A) Mortality rates that were associated with poor sanitation in Megacity a hundred years ago were orders of magnitude higher than are mortality rates associated with vehicular traffic, which is currently a major cause of death in the city.--->correct
(B) For several decades, Megacity, as distinct from the countryside, has had a steadily declining birth rate.--->即使出生率低人口依然会增加
(C) Cities smaller than Megacity have also experienced sustained population growth.--->irreverent
(D) The great majority of immigrants to Remsland settle in Megacity, at least initially.--->weaken
(E) Megacity has long offered better employment prospects than most rural areas.--->weaken

27. T:40s
Plant scientists have used genetic engineering on seeds to produce crop plants that are highly resistant to insect damage.  Unfortunately, the seeds themselves are quite expensive, and the plants require more fertilizer and water to grow well than normal ones.  Thus, for most farmers the savings on pesticides would not compensate for the higher seed costs and the cost of additional fertilizer.  However, since consumer demand for grains, fruits, and vegetables grown without the use of pesticides continues to rise, the use of genetically engineered seeds of this kind is likely to become widespread.
BF:
(A) The first supplies a context for the argument; the second is the argument's main conclusion.--->correct
(B) The first introduces a development that the argument predicts will have a certain outcome; the second is a state of affairs that the argument denies will be part of that outcome.
(C) The first presents a development that the argument predicts will have a certain outcome; the second acknowledges a consideration that weighs against that prediction.
(D) The first provides evidence to support a prediction that the argument seeks to defend; the second is that prediction.--->the first doesn't support the second
(E) The first and the second each provide evidence to support the argument's main conclusion.--->the second shi conclusion

28. T: 39s
First-time computer buyers buying PXC home computers typically buy models that cost much less and have a smaller profit margin per computer than do PXC computers bought by people replacing their computers with more powerful models.  
Last year PXC's profits from computer sales were substantially higher than the previous year, although about the same number of PXC computers were sold and the prices and profit margins for each computer model that PXC sells remained unchanged.
(A) PXC's competitors raised the prices on their computers last year, making PXC computers more attractive to first-time computer buyers.--->number changes
(B) The number of people buying PXC computers who also bought PXC computer-related products, such as printers, was larger last year than the previous year.--->correct
(C) Among computer buyers who bought a PXC computer to replace their existing computer, the proportion who were replacing a computer made by a competitor of PXC was greater last year than the previous year.--->number changes
(D) The proportion of PXC computers bought by first-time computer buyers was smaller last year than the previous year.--->irreverent
(E) PXC's production costs for its computers were lower last year than they had been the previous year.--->profit margins change