问答

2答疑

[Data Sufficiency]

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题目：

If Antonio bought two half-gallon cartons of ice cream during a special sale, what percent of the total regular price of the two cartons did he save?
(1)   Antonio paid the regular price for the first carton and received the second carton for half the regular price.
(2)   The regular price of the ice cream Antonio bought was $4.00 per half-gallon carton.

选项:

答案:

A
2答疑

[Data Sufficiency]

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题目：

Is │x - y│>│x - z│?
(1)   │y│>│z│
(2)     x < 0
nbsp; I

选项:

答案:

E
2答疑

[Multi-Source Reasoning]

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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：

13. B is a boy aged 4 years 3 months whose height is 110 cm and whose weight is 19 kg. For each of the following statements, select Yes if, based on the given information, it must be true of B relative to a model population. Otherwise, select NO.

选项:

A、Approximately 50% of boys at the same weight are shorter than B.
B、No more than 15% of boys at this age are taller than B.
C、B's height is greater than or equal to that of 50% of boys aged 5 years 0 months.

答案:

B A A
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[Problem Solving]

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题目：

A certain computer program generates a sequence of numbers an such that  and  for all integers k such that . If , then ?

选项:

A、32
B、43
C、64
D、100
E、128

答案:

B
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[Critical Reasoning]

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题目：

Several ancient Greek texts provide accounts of people being poisoned by honey that the tests suggest was made from the nectar of rhododendron or oleander plants. Honey made from such nectar can cause the effects the tests describe, but only if eaten fresh, since the honey loses
its toxicity with a few weeks of being made. In Greece, rhododendron and oleander bloom only in springtime, when they are the predominant
sources of nectar.
 
Which of the following conclusions is most strongly supported by the information given?

选项:

A、There are no plants that grew in Greece in ancient times that produce more nectar than rhododendron or oleander do.
B、In area where neither rhododendron nor oleander grow, honey is never poisonous.
C、A beehive's honeycomb cannot have same sections that contain toxic honey and other sections that contain nontoxic honey.
D、The incidents of honey poisoning that are related in the ancient texts occurred in the springtime or in the early summer.
E、Whether the honey in a beehive is toxic depends solely on which plants were the source of the nectar that was used to make the money.

答案:

D
2答疑

[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 author of the passage discusses productivity in the retail industry in the first paragraph primarily in order to

选项:

A、suggest a way in which IT can be used to create a competitive advantage
B、provide an illustration of the 'productivity paradox'
C、emphasize the practical value of the introduction of IT
D、cite an industry in which productivity did not stagnate during the 1980's
E、counter the argument that IT could potentially create competitive advantage

答案:

B
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[Sentence Correction]

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题目：

According to some botanists, invasive plants are the second most serious threat, after habitat loss, to native species of plants and animals and to the maintenance of biologically diverse ecosystems.

选项:

A、threat, after habitat loss, to native species of plants and animals and to the maintenance of biologically diverse ecosystems
B、threat, after habitat loss, to native species of plants and animals and for maintaining biologically diverse ecosystems
C、threat, after losing their habitat, to native species of plants and animals and also to maintenance of biologically diverse ecosystems
D、threat to native species of plants and animals and for maintaining biologically diverse ecosystems, after habitat loss
E、threat to native species of plants and animals as well as to maintaining biologically diverse ecosystems, after losing their habitat

答案:

A
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[Data Sufficiency]

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题目：

What is the volume of the cube above?
(1) The surface area of the cube is 600 square inches.
(2)   The length of diagonal AB  is inches.

选项:

答案:

D
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[Reading Comprehension]

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文章：

Line         Two works published in 1984 demonstrate
  contrasting approaches to writing the history of
  United States women. Buel and Buel’s biography
  of Mary Fish (1736–1818) makes little effort to
(5) place her story in the context of recent
  historiography on women. Lebsock, meanwhile,
  attempts not only to write the history of women in
  one southern community, but also to redirect two
  decades of historiographical debate as to
(10) whether women gained or lost status in the
  nineteenth century as compared with the
  eighteenth century. Although both books offer the
  reader the opportunity to assess this controversy
  regarding women’s status, only Lebsock’s deals with
(15) it directly. She examines several different aspects
  of women’s status, helping to refine and resolve the
  issues. She concludes that while
  women gained autonomy in some areas,
  especially in the private sphere, they lost it in
(20) many aspects of the economic sphere. More
  importantly, she shows that the debate itself
  depends on frame of reference: in many respects,
  women lost power in relation to men, for example,
  as certain jobs (delivering babies, supervising
(25) schools) were taken over by men. Yet women also
  gained power in comparison with their previous
  status, owning a higher proportion of real estate,
  for example. In contrast, Buel and Buel’s
  biography provides ample raw material for
(30) questioning the myth, fostered by some
  historians, of a colonial golden age in the
  eighteenth century but does not give the reader
  much guidance in analyzing the controversy over
  women’s status.


题目：

According to the passage, Lebsock’s work differs from Buel and Buel’s work in that Lebsock’s work

选项:

A、uses a large number of primary sources
B、ignores issues of women’s legal status
C、refuses to take a position on women’s status in the eighteenth century
D、addresses larger historiographical issues
E、fails to provide sufficient material to support its claims

答案:

D
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[Sentence Correction]

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题目：

Scientists have found signs that moving water changed the chemical makeup of the surface of Mars in recent eras, therefore concluding that its crust is harboring up to three times as much water than was previously thought.
 

选项:

A、 eras, therefore concluding that its crust is harboring up to three times as much water than was
B、 eras, therefore concluding that the planet's crust harbors up to three times as much water or more as was
C、 eras and have therefore concluded that the planet's crust harbors up to three times as much water as
D、 eras and they have concluded, therefore, that its crust harbors up to three times as much water, or more, than
E、 eras and concluded, therefore, that the planet's crust is harboring up to three times more water as was

答案:

C
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1137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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3236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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3579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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1186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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2732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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1878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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[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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1262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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300277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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307404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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