问答

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[Critical Reasoning]

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文章：

Scientists typically do their most creative work before the age of forty. It is commonly thought that this happens because aging by itself brings about a loss of creative capacity. However, studies show that of scientists who produce highly creative work beyond the age of forty, a disproportionately large number entered their fi eld at an older age than is usual. Since by the age of forty the large majority of scientists have been working in their fi eld for at least fifteen years, the studies' finding strongly suggests that the real reason why scientists over forty rarely produce highly creative work is not that they have aged but rather that scientists over forty have generally spent too long in their field.

题目：

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

选项:

A、The first is a claim, the accuracy of which is at issue in the argument; the second is a conclusion drawn on the basis of that claim.The first is an objection that has been raised against a position defended in the argument; the second is that position
B、The first is evidence that has been used to support an explanation that the argument challenges; the second is that explanation.
C、The first is evidence that has been used to support an explanation that the argument challenges; the second is a competing explanation that the argument favors. 
D、The first provides evidence to support an explanation that the argument favors; the second is that explanation

答案:

E
2答疑

[Critical Reasoning]

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题目：

The Hyksos invaded the Nile Delta of Egypt and ruled it from 1550 B.C Their origin is uncertain, but archaeologists hypothesize that they were Canaanites. In support of this hypothesis, the archaeologists point out that excavations of Avans, the Hyksos capital in Egypt, have uncovered large numbers of artifacts virtually identical to artifacts produced in Ashkelon, and Ashkelon was a major city of Canaan at the time of the Hyksos' invasion.
 
In order to evaluate the force of the archaeologists evidence ,it would useful to determine which of the following ?

选项:

A、Whether artifacts from Ashkelon were widely traded to non-Canaanite cities
B、Whether significant numbers of artifacts that do not resemble artifacts produced in Ashkelon have been found at Avaris
C、Whether Avaris was the nearest Hyksos city in Egypt to Canaan
D、Whether Ashkelon after 1550 B.C. continued to produce artifacts similar to whose  found at Avaris
E、Whether any artifacts produced by the Hyksos after 1550 B.C .have been found in Egypt

答案:

A
2答疑

[Critical Reasoning]

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题目：

Electronic computer chips made of tiny silicon wafers now regularly contain millions of electronic switches.  Unfortunately, electronic switches that are this small cannot withstand intense radiation.  Micro-Mechanics plans to produce a chip that, because it uses only microscopic mechanical switches, will be invulnerable to radiation damage.  The switches will, however, be slower than electronic switches and the chip will contain only 12,000 switches.
 
For there to be a market for Micro-Mechanics' chip as a result of the apparent advantage described above, each of the following would have to be true EXCEPT:

选项:

A、There will be applications in which the speed attainable by an electronic switch is not essential.
B、Switches used on electronic chips that contain only 12,000 switches are more vulnerable to radiation damage than the switches on Micro-Mechanics' chip will be.
C、There will be applications for computer chips in environments where the chips may have to survive intense radiation.
D、Some devices in which computer chips will be used will have other components that will be able to function during or after exposure to radiation.
E、Manufacturers are able to protect electronic computer chips against exposure to intense radiation, where this protection is necessary.

答案:

E
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[Sentence Correction]

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题目：

A new genetically engineered papaya was produced not by seed companies who have been motivated by profit, which was the case with most genetically modified crops previously approved for commercial use, but university and United States Department of Agriculture researchers who allowed growers to use it free of charge.

选项:

A、produced not by seed companies who have been motivated by profit, which was the case with most genetically modified crops previously approved for commercial use, but
B、produced not by profit-motivated seed companies, the case with most genetically modified crops previously approved for commercial use, but
C、produced not by profit-motivated seed companies, as was the case with most genetically modified crops previously approved for commercial use, but by
D、not produced by profit-motivated seed companies, which was the case with most genetically modified crops previously approved for commercial use, but was produced by
E、not produced by seed companies who have been motivated by profit, the case with most genetically modified crops previously approved for commercial use, but by

答案:

C
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[Data Sufficiency]

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题目：

The average (arithmetic mean) of a list of numbers is what percent of the sum of the numbers?
(1) There are 8 numbers in the list.
(2) The sum of the numbers in the list is 100.

选项:

答案:

A
2答疑

[Reading Comprehension]

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文章：

    In American Genesis, which covers the century of technological innovation in the United States beginning in 1876,Thomas Hughes assigns special prominence to Thomas Edison as archetype of the independent nineteenth-century inventor. However, Hughes virtually ignores Edison's famous contemporary and notorious adversary in the field of electric light and power,George Westinghouse. This comparative neglect of Westinghouse is consistent with other recent historians' works, although it marks an intriguing departure from the prevailing view during the inventors' lifetimes (and for decades afterward) of Edison and Westinghouse as the two "pioneer innovators" of the electrical industry.

    My recent reevaluation of Westinghouse, facilitated by materials found in railroad archives, suggests that while Westinghouse and Edison shared important traits as inventors, they differed markedly in their approach to the business aspects of innovation. For Edison as an inventor, novelty was always paramount: the overriding goal of the business of innovation was simply to generate funding for new inventions. Edison therefore undertook just enough sales, product development, and manufacturing to accomplish this. Westinghouse, however, shared the attitudes of the railroads and other industries for whom he developed innovations: product development, standardization, system, and order were top priorities. Westinghouse thus better exemplifies the systematic approach to technological development that would become a hallmark of modern corporate research and development.

题目：

According to the passage, Edison's chief concern as an inventor was the

选项:

A、availability of a commercial market
B、costs of developing a prototype
C、originality of his inventions
D、maintenance of high standards throughout production
E、generation of enough profits to pay for continued marketing

答案:

C
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[Data Sufficiency]

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题目：

Is the number of seconds required to travel feet at feet per second greater than the number of seconds required to travel feet at feet per second?
(1) is 30 greater than .
(2)  is 30 greater than .

选项:

答案:

E
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[Sentence Correction]

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题目：

According to its proponents, a proposed new style of aircraft could, by skimming along the top of the atmosphere, fly between most points on Earth in under two hours.

选项:

A、According to its proponents, a proposed new style of aircraft could, by skimming along the top of the atmosphere, fly between most points on Earth in under two hours.
B、By skimming along the top of the atmosphere, proponents of a proposed new style of aircraft say it could fly between most points on Earth in under two hours.
C、A proposed new style of aircraft could fly between most points on Earth in under two hours, according to its proponents, with it skimming along the top of the atmosphere.
D、A proposed new style of aircraft, say its proponents, could fly between most points on Earth in under two hours because of its skimming along the top of the atmosphere.
E、According to its proponents, skimming along the top of the atmosphere makes it possible that a proposed new style of aircraft could fly between most points on Earth in under two hours.

答案:

A
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[Sentence Correction]

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题目：

Beneath the soil of the Malheur National Forest in eastern Oregon, a fungus has for centuries been slowly weaving its way through the roots of trees, to become the largest living single organism known to humans.

选项:

A、 has for centuries been slowly weaving its way through the roots of trees, to become
B、 has slowly woven its way through the roots of trees for centuries, and so becoming
C、 that has been slowly weaving its way through the roots of trees for centuries has become
D、 that has for centuries slowly woven its way through the roots of trees and has become
E、 that, having slowly woven its way through the roots of trees for centuries, to become

答案:

C
2答疑

[Reading Comprehension]

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文章：

What kinds of property rights apply to Algonquian family hunting territories, and how did they come to be?  The dominant view in recent decades has been that family hunting territories, like other forms of private landownership, were not found among Algonquians (a group of North American Indian tribes) before contact with Europeans but are the result of changes in Algonquian society brought about by the European-Algonquian fur trade, in combination with other factors such as ecological changes and consequent shifts in wildlife harvesting patterns.  Another view claims that Algonquian family hunting territories predate contact with Europeans and are forms of private landownership by individuals and families.  More recent fieldwork, however, has shown that individual and family rights to hunting territories form part of a larger land-use system of multifamilial hunting groups, that rights to hunting territories at this larger community level take precedence over those at the individual or family level, and that this system reflects a concept of spiritual and social reciprocity that conflicts with European concepts of private property.  In short, there are now strong reasons to think that it was erroneous to claim that Algonquian family hunting territories ever were, or were becoming, a kind of private property system.

题目：

The primary purpose of the passage is to

选项:

A、provide an explanation for an unexpected phenomenon
B、suggest that a particular question has yet to be answered
C、present a new perspective on an issue
D、defend a traditional view from attack
E、reconcile opposing sides of an argument

答案:

C
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1924浏览

[Undefined]

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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？
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5011浏览

[Undefined]

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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
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5692浏览

[Undefined]

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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
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1905浏览

[Undefined]

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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？
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4123浏览

[GWD]

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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
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2883浏览

[OG]

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The primary purpose of the passage is to
为什么选E不选B
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1907浏览

[Undefined]

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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
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1997浏览

[Undefined]

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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
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426240浏览

[Undefined]

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Analytical!
请问may老师，这题该用什么思路来做？
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433378浏览

[Undefined]

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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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