GMAT逻辑易错题

Among people who experience migraine headaches, some experience what
doctors call "common" migraines, whereas others experience "classical" migraines.
Siblings and spouses of common migraine sufferers are themselves twice as likely as the general population to experience common migraines. Siblings of classical migraine sufferers are four times more likely than the general population to
experience classical migraines, whereas spouses of classical migraine sufferers are no more likely than the general population to experience such headaches.
The information above provides the most support for which of the following
hypotheses?
∙A Susceptibility to classical migraines is more dependent on hereditary factors than is susceptibility to common migraines. 分析A选项
∙B Unmarried adults are more likely to suffer from classical migraines than they are to suffer from common migraines. 分析B选项
∙C People who do not experience migraine headaches are unlikely to have spouses who are migraine headache sufferers. 分析C选项
∙D Children of people who suffer from common migraines are not more likely than the general population to experience a common migraine. 分析D选项
∙E Between one-quarter and one-half of the general population suffer from either common or classical migraine headaches. 分析E选项
对于common m：兄妹（遗传）和夫妻都是2倍
对于classical m：兄妹是4倍，夫妻是相同可能性（1倍）
A说的是classical与遗传有关（4倍）>common与遗传有关（2倍）
B错了，说反了2>1
C推不出
D错了，会more likely，与遗传有关
E推不出
Susceptibility易受影响hereditary遗传
Over the last five years, demand for hotel rooms in Cenopolis has increased
significantly, as has the average price Cenopolis hotels charge for rooms. These trends are projected to continue for the next several years. In response to this economic forecast, Centennial Commercial, a real estate developer, is considering a plan to convert several unoccupied office buildings it owns in Cenopolis into hotels in order to maximize its revenues from these properties.
Which of the following would it be most useful for Centennial Commercial to know in evaluating the plan it is considering?
∙A Whether the population of Cenopolis is expected to grow in the next several years 分析A选项
∙B Whether demand for office space in Cenopolis is projected to increase in the near future 分析B选项
∙C Whether the increased demand for hotel rooms, if met, is likely to lead to an increase in the demand for other travel-related services 分析C选项
∙D Whether demand for hotel rooms has also increased in other cities where Centennial owns office buildings 分析D选项
∙E Whether, on average, hotels that have been created by converting office buildings have fewer guest rooms than do hotels that were built as hotels
原文中，plan--convert several unoccupied office buildings it owns in Cenopolis into hotels 。

goal--maximize its revenues from these properties。

评价题正确答案需要与plan高度相关，plan出现的关键词unoccupied office buildings 和hotels 。

A， population明显无关。

C other travel-related services明显无关。

Din other cities，讨论对象转移。

E，hotels that were built as hotels无关。

其实原文还暗含了比较，要增加收益是相对于原来写字楼的用途而言，所以答案猜测要么和hotel收入有关，要么和office收入有关。

The use of radar detectors in commercial vehicles was banned because commercial truck and bus drivers were using these devices to drive faster than the posted speed limit without fear of arrest. Since drivers of noncommercial vehicles also use radar detectors and since speeding decreases safety for any vehicle, use of radar detectors should also be banned in noncommercial vehicles to increase safety.
Which of the following, if true, most strongly supports the argument above?
∙A The average noncommercial-vehicle driver is involved in less long-distance driving than is the average commercial-vehicle driver. 分析A选项
∙B In many places airplanes or helicopters are used rather than radar to locate vehicles traveling faster than the posted speed limit. 分析B选项
∙C The ban on radar detectors in commercial vehicles has been effective in deterring them from speeding. 分析C选项
∙D Traffic accidents involving a truck or bus generally pose a greater threat of injury or death than do other accidents. 分析D选项
∙E Radar detectors are sometimes set off by devices other than the law enforcement devices that the radar detectors were built to detect. 分析E选项
C
Traveler: Southern Airways has a far worse safety record than Air Dacentaria over the past few years, in terms of both the frequency of accidents and the severity of accidents. Therefore, although Air Dacentaria is slightly more expensive, I will
choose it over Southern Airways for my flight from Pederton to Dacenta, since it is worth paying extra to have a safer flight.
Which of the following, if true, casts the most serious doubt on the traveler's
argument?
∙A AirDacentaria's flight from Pederton to Dacenta is nonstop, whereas Southern Airways' flight touches down in Gorinda on the way. 分析A选项
∙B Most Southern Airways flights, but not its flight from Pederton to Dacenta, use Sarmouth airport, which because of its mountainous location is one of the world's most dangerous. 分析B选项
∙C For its flights from Pederton to Dacenta, Southern Airways uses a different model of airplane, with a smaller capacity, than the model Air Dacentaria uses for its flights on the same route. 分析C选项
∙D Only in the last few years has the cost of flying from Pederton to Dacenta been more expensive on Air Dacentaria than on Southern Airways. 分析D选项
∙E Although the frequency of accidents is greater on Southern Airways, on both airlines the proportion of flights that have accidents is very small. 分析E选项
A 无关选项
B因为这个机场很危险，所以出事频率大，但不包括P到D的航线。

削弱
强调题目中的信息！
C容量小，无关
D票价，无关
E虽然S的事故频率较高但是两家公司的总体事故频率都很低（并没有涉及S和D安全系数的比较。

无关）
In the past, most children who went sledding in the winter snow in Verland used wooden sleds with runners and steering bars. Ten years ago, smooth plastic sleds became popular; they go faster than wooden sleds but are harder to steer and slow.
The concern that plastic sleds are more dangerous is clearly borne out by the fact that the number of children injured while sledding was much higher last winter than it was ten years ago.
Which of the following, if true in Verland, most seriously undermines the force of the evidence cited?
∙A A few children still use traditional wooden sleds. 分析A选项
∙B Very few children wear any kind of protective gear, such as helmets, while sledding. 分析B选项
∙C Plastic sleds can be used in a much wider variety of snow conditions than wooden sleds can. 分析C选项
∙D Most sledding injuries occur when a sled collides with a tree, a rock, or, another sled. 分析D选项
∙E Because the traditional wooden sled can carry more than one rider, an accident involving a wooden sled can result in several children being injured. 分析E选项C解释塑料滑板出事故多的原因他因！事故多是因为应用范围多，基数大
Metal rings recently excavated from seventh-century settlements in the western part of Mexico were made using the same metallurgical techniques as those used by Ecuadorian artisans before and during that period. These techniques are
sufficiently complex to make their independent development in both areas unlikely.
Since the people of these two areas were in cultural contact, archaeologists
hypothesize that the metallurgical techniques used to make the rings found in Mexico were learned by Mexican artisans from Ecuadorian counterparts.
Which of the following would it be most useful to establish in order to evaluate the archaeologists' hypothesis?
∙A Whether metal objects were traded from Ecuador to western Mexico during the seventh century 分析A选项
∙B Whether travel between western Mexico and Ecuador in the seventh century would have been primarily by land or by sea 分析B选项
∙C Whether artisans from western Mexico could have learned complex metallurgical techniques from their Ecuadorian counterparts without actually leaving western Mexico 分析C选项
∙D Whether metal tools were used in the seventh-century settlements in western Mexico 分析D选项
∙E Whether any of the techniques used in the manufacture of the metal rings found in western Mexico are still practiced among artisans in Ecuador today 分析E选项M国发现了一种文物，该文物用了某技术，某技术由另一个国家艺术家发明，因此，M国学习了该技术可能是从另国购买的
在第7世纪是否有从厄瓜多尔到墨西哥的金属制品。

这个貌似符合，有了金属制品过来，墨西哥的工匠就可以偷学了。

Following several years of declining advertising sales, the Greenville Times
reorganized its advertising sales force. Before reorganization, the sales force was
organized geographically, with some sales representatives concentrating on
city-center businesses and others concentrating on different outlying regions. The reorganization attempted to increase the sales representatives' knowledge of
clients' businesses by having each sales representative deal with only one type of industry or of retailing. After the reorganization, revenue from advertising sales increased.
In assessing whether the improvement in advertising sales can properly be
attributed to the reorganization, it would be most helpful to find out which of the following?
∙A What proportion of the total revenue of the Greenville Times is generated by advertising sales? 分析A选项
∙B Has the circulation of the Greenville Times increased substantially in the last two years? 分析B选项
∙C Among all the types of industry and retailing that use the Greenville Times as an advertising vehicle, which type accounts for the largest proportion of the
newspaper's advertising sales? 分析C选项
∙D Do any clients of the sales representatives of the Greenville Times have a standing order with the Times for a fixed amount of advertising per month?
∙E Among the advertisers in the Greenville Times, are there more types of retail business or more types of industrial business? 分析E选项
B circulation 发行量可能是他因，发行量变大导致的收入增加
Motorists in a certain country frequently complain that traffic congestion is much worse now than it was 20 years ago. No real measure of how much traffic
congestion there was 20 years ago exists, but the motorists' complaints are almost certainly unwarranted. The country's highway capacity has tripled in the last twenty years, thanks to a vigorous highway construction program, whereas the number of automobiles registered in the country has increased by only 75 percent.
Which of the following, if true, most seriously weakens the argument?
∙A Most automobile travel is local, and the networks of roads and streets in the country's settled areas have changed little over the last 20 years. 分析A选项
∙B Gasoline prices are high, and miles traveled per car per year have not changed much over the last 20 years. 分析B选项
∙C The country's urban centers have well-developed public transit systems that carry most of the people who commute into those centers. 分析C选项
∙D The average age of automobiles registered in the country is lower now than it was
20 years ago. 分析D选项
∙E Radio stations have long been broadcasting regular traffic reports that inform motorists about traffic congestion. 分析E选项
Motorists in a certain country frequently complain that traffic congestion is much worse now than it was 20 years ago. No real measure of how much traffic
congestion there was 20 years ago exists, but the motorists' complaints are almost certainly unwarranted. The country's highway capacity has tripled in the last twenty years, thanks to a vigorous highway construction program, whereas the number of automobiles registered in the country has increased by only 75 percent.
Which of the following, if true, most seriously weakens the argument?
∙A Most automobile travel is local, and the networks of roads and streets in the country's settled areas have changed little over the last 20 years. 分析A选项
∙B Gasoline prices are high, and miles traveled per car per year have not changed much over the last 20 years. 分析B选项
∙C The country's urban centers have well-developed public transit systems that carry most of the people who commute into those centers. 分析C选项
∙D The average age of automobiles registered in the country is lower now than it was
20 years ago. 分析D选项
∙E Radio stations have long been broadcasting regular traffic reports that inform motorists about traffic congestion. 分析E选项
A
The percentage of households with an annual income of more than $40,000 is higher in Merton County than in any other county. However, the percentage of
households with an annual income of $60,000 or more is higher in Sommer County.
If the statements above are true, which of the following must also be true?
∙A The percentage of households with an annual income of $80,000 is higher in Sommer County than in Merton County. 分析A选项
∙B Merton County has the second highest percentage of households with an annual income of $60,000 or more. 分析B选项
∙C Some households in Merton County have an annual income between $40,000 and $60,000. 分析C选项
∙D The number of households with an annual income of more than $40,000 is greater in Merton County than in Sommer County. 分析D选项
∙E Average annual household income is higher in Sommer County than in Merton County. 分析E选项
选项A，题目没有给出两县收入8万以上的对比，所以无法得出S>M，排除
选项B，题目只说S大，无法推断出M第二大，排除
选项C，题目没交代，先保留
选项D，题目给出的是百分比，而选项是数目，排除
选项E，题目只给出6万以上是S>M，并没有指出总的年均收入也是S>M，扩大了范围，因此只有C保留，选C百分比和数值不同。