问答

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[Reading Comprehension]

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文章：

    Most pre-1990 literature on businesses' use of information technology (IT)-defined as any form of computer based information system-focused on spectacular IT successes and reflected a general optimism concerning IT's potential as a resource for creating competitive advantage. But toward the end of the 1980's, some economists spoke of a"productivity paradox"; despite huge IT investments, most notably in the service sectors, productivity stagnated. In the retail industry, for example, in which IT had been widely adopted during the 1980's, productivity (average output per hour) rose at an average annual rate of 1.1 percent between 1973 and 1989, compared with 2.4 percent in the preceding 25-year period. Proponents of IT argued that it takes both time and a critical mass of investment for IT to yield benefits, and some suggested that growth figures for the 1990's proved these benefits were finally being realized. They also argued that measures of productivity ignore what would have happened without investments in IT productivity gains might have been even lower. There were even claims that IT had improved the performance of the service sector significantly, although macroeconomic measures of productivity did not reflect the improvement.

    But some observers questioned why, if IT had conferred economic value, it did not produce direct competitive advantages for individual firms. Resource-based theory offers an answer, asserting that, in general, firms gain competitive advantages by accumulating resources that are economically valuable, relatively scarce, and not easily replicated. According to a recent study of retail firms, which confirmed that IT has become pervasive and relatively easy to acquire, IT by itself appeared to have conferred little advantage. In fact, though little evidence of any direct effect was found, the frequent negative correlations between IT and performance suggested that IT had probably weakened some firms' competitive positions. However, firms' human resources, in and of themselves, did explain improved performance, and some firms gained IT-related advantages by merging IT with complementary resources, particularly human resources. The findings support the notion, founded in resource-based theory, that competitive advantages do not arise from easily replicated resources, no matter how impressive or economically valuable they may be, but from complex, intangible resources.

题目：

The passage suggests that proponents of resource-based theory would be likely to explain IT's inability to produce direct competitive advantages for individual firms by pointing out that

选项:

A、IT is not a resource that is difficult to obtain
B、IT is not an economically valuable resource
C、IT is a complex, intangible resource
D、economic progress has resulted from IT only in the service sector
E、changes brought about by IT cannot be detected by macroeconomic measures

答案:

A
5答疑

[Reading Comprehension]

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文章：

In its 1903 decision in the case of Lone Wolf v. Hitchcock, the United States Supreme Court rejected the efforts of three Native American tribes to prevent the opening of tribal lands to non-Indian settlement without tribal consent.  In his study of the Lone Wolf case, Blue Clark properly emphasizes the Court's assertion of a virtually unlimited unilateral power of Congress (the House of Representatives and the Senate) over Native American affairs.  But he fails to note the decision's more far-reaching impact:  shortly after Lone Wolf, the federal government totally abandoned negotiation and execution of formal written agreements with Indian tribes as a prerequisite for the implementation of federal Indian policy.  Many commentators believe that this change had already occurred in 1871 when--following a dispute between the House and the Senate over which chamber should enjoy primacy in Indian affairs--Congress abolished the making of treaties with Native American tribes.  But in reality the federal government continued to negotiate formal tribal agreements past the turn of the century, treating these documents not as treaties with sovereign nations requiring ratification by the Senate but simply as legislation to be passed by both houses of Congress.  The Lone Wolf decision ended this era of formal negotiation and finally did away with what had increasingly become the empty formality of obtaining tribal consent.

题目：

According to the passage, the congressional action of 1871 had which of the following effects?

选项:

A、Native American tribal agreements were treated as legislation that had to be passed by both houses of Congress.
B、The number of formal agreements negotiated between the federal government and Native American tribes decreased.
C、The procedures for congressional approval and implementation of federal Indian policy were made more precise.
D、It became more difficult for Congress to exercise unilateral authority over Native American affairs.
E、The role of Congress in the ratification of treaties with sovereign nations was eventually undermined.

答案:

A
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[Sentence Correction]

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题目：

Whereas the use of synthetic fertilizers has greatly expanded agricultural productivity in many parts of the world, an increase in their use can create serious environmental problems such as water pollution, and their substitution for more traditional fertilizers may accelerate soil structure deterioration and soil erosion.

选项:

A、 an increase in their use can create serious environmental problems such as water pollution, and their substitution for more traditional fertilizers
B、 an increase in their use can create serious environmental problems like water pollution, and if substituted for more traditional fertilizers, it
C、 if these fertilizers are used increasingly, they can create serious environmental problems such as water pollution, and if used as substitutions for more traditional fertilizers, they
D、 the increased usage of these fertilizers can create serious environmental problems such as water pollution, while if substituted for more traditional fertilizers, this substitution
E、 the increased usage of these fertilizers can create serious environmental problems like water pollution, while their substitution for more traditional fertilizers

答案:

A
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[Critical Reasoning]

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题目：

In recent years, networks of fiber-optic cable have been replacing electrical wire for transmitting telecommunications signals, Signals running through fiber-optic cables deteriorate, and wo the signals must be run through a piece of e3quiplent called a regenerator before being transmitted father. Light-Line is the leading manufacturer of signal regenerators. Therefore, Light-line is one of the companies that will most benefit if new long-distance fiber-optic telecommunications networks are constructed.
 
Which of the following, if true, casts the most doubt on the prediction about light-ling's prospects?

选项:

A、Telecommunications signals sent along electrical wires can travel much Farther than signals transmitted through fiber-optic before needing to be regenerated.
B、Expanding its production of regenerators will require Light-line to spend Proportionately more on labor and materials.
C、The volume of signals that a fiber-optic cable can carry is several Thousand timesgreater than the volume that can be carried by an electrical Wire of similar size.
D、There are technologies that enable telecommunications signals to be Transmitted without either wire or fiber-optic cable
E、 Several manufacturers are developing regenerator technologies that willow signals To be transmitted many times farther than at present before requiring regeneration

答案:

E
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[Sentence Correction]

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题目：

Since the start of the space age, more and more littering has occurred in orbits near Earth, often because the intentional discarding of lens caps, packing material, fuel tanks, and payload covers.

选项:

A、more and more littering has occurred in orbits near Earth, often because
B、orbits near Earth have become more and more littered, often from
C、orbits near Earth became littered more and more, often resulting from
D、there have been more and more littering of orbits near Earth, often because of
E、there had been littering more and more of orbits near Earth, often with

答案:

B
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[Critical Reasoning]

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题目：

Archaeologist: Researchers excavating a burial site in Cyprus found a feline skeleton lying near a human skeleton. Both skeletons were in the same sediment at the same depth and equally well-preserved, suggesting that the feline and human were buried together about 9,500 years ago. This shows that felines were domesticated around the time farming began, when they would have been useful in protecting stores of grain from mice.

Which of the following, if true, would most seriously weaken the archaeologist’s argument?

选项:

A、Archaeologists have not found any remains of stores of grain in the immediate vicinity of the burial site.
B、The burial site in Cyprus is substantially older than any other known burial site in which a feline skeleton and a human skeleton appear to have been buried together.
C、Paintings found near the burial site seem to show people keeping felines as domestic companions, but do not show felines hunting mice.
D、In Cyprus, there are many burial sites dating from around 9,500 years ago in which the remains of wild animals appear to have been buried alongside human remains.
E、Before felines were domesticated, early farmers had no effective way to protect stores of grain from mice.

答案:

D
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[Critical Reasoning]

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题目：

Editorial: The roof of Northtown’s municipal equipment-storage building collapsed under the weight of last week’s heavy snowfall. The building was constructed recently and met local building-safety codes in every particular, except that the nails used for attaching roof supports to the building’s columns were of a smaller size than the codes specify for this purpose. Clearly, this collapse exemplifies how even a single, apparently insignificant departure from safety standards can have severe consequences.

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

选项:

A、The only other buildings to suffer roof collapses from the weight of the snowfall were older buildings constructed according to less exacting standards than those in the codes.
B、The amount of snow that accumulated on the roof of the equipment-storage building was greater than the predicted maximum that was used in drawing up the safety codes.
C、Because the equipment-storage building was not intended for human occupation, some safety-code provisions that would have applied to an office building did not apply to it.
D、The municipality of Northtown itself has the responsibility for ensuring that buildings constructed within its boundaries meet the provisions of the building-safety codes.
E、Because the equipment-storage building was used for storing snow-removal equipment, the building was almost completely empty when the roof collapsed.

答案:

B
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[Sentence Correction]

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题目：

Each year companies in the United States could save as much as $58 billion annually by preventing illness among employees and gain as much as $200 billion through improving performance of workers if they simply provided offices with cleaner air.

选项:

A、 annually by preventing illness among employees and gain as much as $200 billion through improving performance of workers if they simply provided
B、 annually if they prevented employee illness and gain as much as $200 billion through worker performance improved by simply providing
C、 annually in employee illness prevention and gain as much as $200 billion through worker performance improved by simply providing
D、 in employee illness prevention and gain as much as $200 billion through improving performance of workers if they simply provided
E、 by preventing illness among employees and gain as much as $200 billion through improved worker performance if they simply provided

答案:

E
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[Reading Comprehension]

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A recent study has provided clues to predator-prey dynamics in the late Pleistocene era.  Researchers compared the number of tooth fractures in present-day carnivores with tooth fractures in carnivores that lived 36,000 to 10,000 years ago and that were preserved in the Rancho La Brea tar pits in Los Angeles.  The breakage frequencies in the extinct species were strikingly higher than those in the present-day species.
 
In considering possible explanations for this finding, the researchers dismissed demographic bias because older individuals were not overrepresented in the fossil samples.  They rejected preservational bias because a total absence of breakage in two extinct species demonstrated that the fractures were not the result of abrasion within the pits.  They ruled out local bias because breakage data obtained from other Pleistocene sites were similar to the La Brea data.  The explanation they consider most plausible is behavioral differences between extinct and present-day carnivores--in particular, more contact between the teeth of predators and the bones of prey due to more thorough consumption of carcasses by the extinct species.  Such thorough carcass consumption implies to the researchers either that prey availability was low, at least seasonally, or that there was intense competition over kills and a high rate of carcass theft due to relatively high predator densities.

题目：

The passage suggests that, compared with Pleistocene carnivores in other areas, Pleistocene carnivores in the La Brea area

选项:

A、included the same species, in approximately the same proportions
B、had a similar frequency of tooth fractures
C、populated the La Brea area more densely
D、consumed their prey more thoroughly
E、found it harder to obtain sufficient prey

答案:

B
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[Critical Reasoning]

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题目：

For several years, per capita expenditure on prescription drugs in Voronia rose by fifteen percent or more annually.  In order to curb these dramatic increases, the ministry of health prohibited drug manufacturers from raising any of their products' prices.  Even though use of prescription drugs did not expand after this price freeze, per capita expenditure for prescription drugs continued to increase by a substantial percentage each year.
 
Which of the following, if true, most helps to explain why the ministry's action did not achieve its goal?

选项:

A、After price increases were prohibited, drug manufacturers concentrated on producing new medications to replace existing products.
B、The population of Voronia rose steadily throughout the period.
C、Improvements in manufacturing processes enabled drug manufacturers to maintain high profit levels on drugs despite the price freeze.
D、In addition to imposing a price freeze, the government encouraged doctors to prescribe generic versions of common drugs instead of the more expensive brand-name versions.
E、After price increases were prohibited, some foreign manufacturers of expensive drugs ceased marketing them in Voronia.

答案:

A
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448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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[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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[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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635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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1465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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[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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692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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704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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[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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[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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