问答

1答疑

[Critical Reasoning]

试题详情

题目:

To prevent a newly built dam on the Chiff River from blocking the route of fish migrating to breeding grounds upstream, the dam includes a fish pass, a mechanism designed to allow fish through the dam. Before the construction of the dam and fish pass, several thousand fish a day swam upriver during spawning season. But in the first season after the project's completion, only 300 per day made the journey. Clearly, the fish pass is defective.

Which of the following, if true, most seriously weakens the argument?

选项:

A、
A. Fish that have migrated to the upstream breeding grounds do not return down the Chiff River again.
B、
B. On other rivers in the region, the construction of dams with fish passes has led to only small decreases in the number of fish migrating upstream.
C、
C. The construction of the dam stirred up potentially toxic river sediments that were carried downstream.
D、
D. Populations of migratory fish in the Chiff River have been declining slightly over the last 20 years.
E、
E. During spawning season, the dam releases sufficient water for migratory fish below the dam to swim upstream.

答案:

C
1答疑

[Critical Reasoning]

试题详情

题目:

Which of the following, if true, most logically completes the politician's argument?

United States politician: Although the amount of United States goods shipped to Mexico doubled in the year after tariffs on trade between the two countries were reduced, it does not follow that the reduction in tariffs caused the sales of United States goods to companies and consumers in Mexico to double that year, because __________.

选项:

A、many of the United States companies that produced goods that year had competitors based in Mexico that had long produced the same kind of goods
B、most of the increase in goods shipped by United States companies to Mexico was in parts shipped to the companies’ newly relocated subsidiaries for assembly and subsequent shipment back to the United States
C、marketing goods to a previously unavailable group of consumers is most successful when advertising specifically targets those consumers, but developing such advertising often takes longer than a year
D、the amount of Mexican goods shipped to the United States remained the same as it had been before the tariff reductions
E、there was no significant change in the employment rate in either of the countries that year

答案:

B
1答疑

[Data Sufficiency]

试题详情

题目:

For each landscaping job that takes more than 4 hours, a certain contractor charges a total of r dollars for the first 4 hours plus 0.2r dollars for each additional hour or fraction of an hour, where . Did a particular landscaping job take more than 10 hours?
(1)     The contractor charged a total of $288 for the job.
(2)     The contractor charged a total of 2.4r dollars for the job.

选项:

答案:

B
1答疑

[Multi-Source Reasoning]

试题详情

文章:

Height-for-age standards

The World Health Organization (WHO) has produced a comprehensive set of growth stan­dards for children. These standards are based on studies of children living in 6 nations on 5 continents under optimal conditions with respect to health and nutrition. The table dis­plays the percentile distribution of height, in centimeters, at 3-month intervals, for boys ages 2 through 5 according to the WHO model. In a model population—a large population of boys ages 2 through 5 that conforms to the WHO growth standards—for n = 3.15, 50. 85. and 97, the nth percentile in height for a given age is the unique height among boys of that age that is greater than or equal to n percent, and less than or equal to (100 - n) percent, of heights of boys of that age.

Weight-for-height standards

The graph shows the percentile distribution of weight, in kilograms, for heights from 80 cm to 120 cm. for boys ages 2 through 5, according to the WHO model. In a model population, for n = 3,15,50,85, and 97. the nth percentile in weight for a given height is the unique weight among boys of that height that is greater than or equal to n percent, and less than or equal to (100 - n) percent, of weights of boys of that age.

题目:

14. For each of the following statements, select Yes if the statements must be true of a boy select at random from a model population. Otherwise, select No.

选项:

A、If his age is greater than 3 years 3 mouths, the probability that his height is at least 98.0 cm is greater than 50%.
B、If he is at least 105 cm tall, the probability that his weight is 14.0 kg is no greater than 3%.
C、If he is 114 cm tall, he is taller than at least 85% of boys his age.

答案:

A A B
1答疑

[Data Sufficiency]

试题详情

题目:

In the xy-plane, what is the x-intercept of a certain line?
(1)   The line passes through the point (0,2).
(2) The y-intercept of the line is 2.

选项:

答案:

E
1答疑

[Critical Reasoning]

试题详情

题目:

United Lumber will use trees from its forests for two products. The tree trunks will be used for lumber and the branches converted into wood chips to make fiberboard. The cost of this conversion would be the same whether done at the logging site, where the trees are debranched, or at United's factory. However, wood chips occupy less than half the volume of the branches from which they are made.
The information given, if accurate, most strongly supports which of the following?

选项:

A、Converting the branches into wood chips at the logging site would require transporting a fully assembled wood-chipping machine to and from the site.
B、It would be more economical to debranch the trees at the factory where the fiberboard is manufactured.
C、The debranching of trees and the conversion of the branches into chips are the only stages in the processing of branches that it would be in United's economic advantage to perform at the logging site. 
D、Transportation costs from the logging site to the factory that are determined by volume of cargo would be lower if the conversion into chips is done at the logging site rather than at the factory.
E、In the wood-processing industry, branches are used only for the production of wood chips for fiberboard.

答案:

D
1答疑

[Problem Solving]

试题详情

题目:

Enrollment in City College in 1980 was 83⅓ percent of enrollment in 1990.  What was the percent increase in the college's enrollment from 1980 to 1990?

选项:

A、10%
B、16⅔%
C、20%
D、25%
E、183⅓%

答案:

C
1答疑

[Problem Solving]

试题详情

题目:

What is the maximum number of 3×3 squares that can be formed from the squares in the 6×6 checker board below? 

选项:

A、A 4
B、B 6
C、C 12
D、D 16
E、E 24

答案:

D
1答疑

[Sentence Correction]

试题详情

题目:

In late 1997, the chambers inside the pyramid of the Pharaoh Menkaure at Giza were closed to visitors for cleaning and repair due to moisture exhaled by tourists, which raised its humidity to such levels so that salt from the stone was crystallizing and fungus was growing on the walls.

选项:

A、due to moisture exhaled by tourists, which raised its humidity to such levels so that salt from the stone was crystallizing
B、due to moisture that tourists had exhaled, thereby raising its humidity to such levels that salt from the stone would crystallize
C、because tourists were exhaling moisture, which had raised the humidity within them to levels such that salt from the stone would crystallize
D、because of moisture that was exhaled by tourists raising the humidity within them to levels so high as to make the salt from the stone crystallize
E、because moisture exhaled by tourists had raised the humidity within them to such levels that salt from the stone was crystallizing

答案:

E
1答疑

[Reading Comprehension]

试题详情

文章:

Most office workers assume that the messages they send to each other via electronic mail and as private as a telephone call or a face-to-face meeting. That assumption is wrong. Although it is illegal in many areas for an employer to eavesdrop on private conversations or telephone calls--even if they take place on a company-owned telephone--there are no clear rules governing electronic mail. In fact, the question of how private electronic mail transmissions should be has emerged as one of the more complicated legal issues of the electronic age.

People's opinions about the degree of privacy that electronic mail should have vary depending on whose electronic mail system is being used and who is reading the messages. Does a government office, for example, have the right to destroy electronic messages created in the course of running the government, thereby denying public access to such documents? Some hold that government offices should issue guidelines that allow their staff to delete such electronic records, and defend this practice by claiming that the messages thus deleted already exist in paper versions whose destruction is forbidden. Opponents of such practices argue that the paper versions often omit such information as who received the messages and when they received them, information commonly carried on electronic mail systems. Government officials, opponents maintain, are civil servants: the public should thus have the right to review any documents created during the conducting of government business.

Questions about electronic mail privacy have also arisen in the private sector. Recently, two employees of an automotive company were discovered to have been communicating disparaging information about their supervisor via electronic mail. The supervisor, who had been monitoring the communication, threatened to fire the employees. When the employees field a grievance complaining that their privacy had been violated, they were let go. Later, their court case for unlawful termination was dismissed: the company's lawyers successfully argued that because the company owned the computer system, its supervisors had the right to read anything created on it.
In some areas, laws prohibit outside interception of electronic mail by a third party without proper authorization such as a search warrant. However, these laws do not cover "inside" interception such as occurred at the automotive company. In the past, courts have ruled that interoffice communications may be considered private only if employees have a "reasonable expectation" of privacy when they send the messages.

The fact is that no absolute guarantee of privacy exists in any computer system. The only solution may be for users to scramble their own messages with encryption codes: unfortunately, such complex codes are likely to undermine the principal virtue of electronic mail: its convenience.

题目:

Which one of the following statements most accurately summarizes the main point of the passage?

选项:

A、Until the legal questions surrounding the privacy of electronic mail in both the public and private sectors have been resolved, office workers will need to scramble their electronic mail messages with encryption codes.
B、The legal questions surrounding the privacy of electronic mail in the work place can best be resolved by treating such communications as if they were as private as telephone conversations or face-to-face meetings.
C、Any attempt to resolve the legal questions surrounding the privacy of electronic mail in the workplace must take into account the essential difference between public-sector and private sector business.
D、At present, in both the public and private sectors, there seem to be no clear general answers to the electronic mail in the workplace.
E、The legal questions surrounding the privacy of electronic mail in the workplace of electronic mail in the workplace can best be resolved by allowing supervisors in public-sector but not private-sector offices to monitor their employees' communications.

答案:

D
0评分
322浏览

[Undefined]

Art historian: Unlike many artistic traditions that sought to depict plants native to the local area in a seasonally appropriate way (for example, depicting scenes of spring with the plants in the appropriate stages of development for that season), seventeenth-century Dutch artists specializing in flower paintings almost exclusively chose to depict exotic species of flowers from outside the local area. Painting such species was worthwhile primarily because the art-buying public had developed a strong preference for images of the exotic. The great botanical centers of the time gave the artists direct access to such flowers, which the artists would freely combine in a single painting, regardless of whether the combined species occurred together in the wild, and depicted each in full bloom, regardless of whether those species bloomed at the same time in nature.

Statement: The art historian makes the point that the species of flowers these Dutch artists chose to paint were 1 largely because the species were 2 .

Select for 1 and for 2 the options that complete the statement so that it is most strongly supported by the information provided. Make only two selections, one in each column.
我选的CE,和EC有什么区别?怎么选出EC的?
0评分
1261浏览

[Undefined]

An unusually severe winter occurred in Europe after the continent was blanketed by a blue haze resulting from the eruption of the Laki Volcano in the European republic of Iceland in the summer of 1984.  Thus, it is evident that major eruptions cause the atmosphere to become cooler than it would be otherwise.
Which of the following statements, if true, most seriously weakens the argument above?
C选项为什么就不会有张冠李戴的问题呢,1984和1982的气候情况能一样吗,C里的火山就可以试用于原文的火山吗
0评分
1436浏览

[Undefined]

The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100 percent, which of the following is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged?
为什么这个题一定是相乘不能是相加呢?y=k1A方-k2B (k1,k2大于0 ),也满足题目说的与A方成正比与B成反比啊?但是这道题只有相乘的情况才能选出正确答案
0评分
555浏览

[Undefined]

Tiger beetles are such fast runners that they can capture virtually any nonflying insect.  However, when running toward an insect, the beetles intermittently stop, and then, a moment later, resume their attack.  Perhaps they cannot maintain their pace and must pause for a moment's rest; but an alternative hypothesis is that while running tiger beetles are unable to process the resulting rapidly changing visual information, and so quickly go blind and stop.
 
Which of the following, if discovered in experiments using artificially moved prey insects, would support one of the two hypotheses and undermine the other?
答案C是怎么支持一个猜想又削弱另一个猜想的?
0评分
1304浏览

[GWD]

The author of the passage implies that which of the following is a possible partial explanation for acquisition behavior during the 1970's and 1980's?
请解释这道题为什么不选C或E,除了正确选项B,我认为文中也正确地提到了这两个选项可以解释acquisition behavior during 1970s and 80s
0评分
929浏览

[OG]

The primary purpose of the passage is to
为什么选E不选B
0评分
623浏览

[Undefined]

Club X has more than 10 but fewer than 40 members. Sometimes the members sit at tables with 3 members at one table and 4 members at each of the other tables, and sometimes they sit at tables with 3 members at one table and 5 members at each of the other tables. If they sit at tables with 6 members at each table except one and fewer than 6 members at that one table, how many members will be at the table that has fewer than 6 members?
提问小梅老师 这道题求讲一下 我没什么思路 带入数字得的是3
0评分
629浏览

[Undefined]

A photography dealer ordered 60 Model X cameras to be sold for $250 each, which represents a 20 percent markup over the dealer's initial cost for each camera. Of the cameras ordered, 6 were never sold and were returned to the manufacturer for a refund of 50 percent of the dealer's initial cost. What was the dealer's approximate profit or loss as a percent of the dealer's initial cost for the 60 cameras?
请问小梅老师 这道题讲讲一下 我算的是19% 原来成本是200每个 亏了6个 每个亏100. 最后得不出答案
0评分
149009浏览

[Undefined]

Analytical!
请问may老师,这题该用什么思路来做?
0评分
156117浏览

[Undefined]

Analytical!
请问张老师,这道题为什么D不对?我有我觉得second paragraph最后一句话特别指向D
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