问答

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[Problem Solving]

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题目：

 In the game of chess, the Knight can make any of the moves displayed in the diagram below. If a Knight is the only piece on the board, what is the greatest number of spaces from which not all 8 moves are possible? 

选项:

A、A 8
B、B 24
C、C 38
D、D 48
E、E 56

答案:

D
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[Reading Comprehension]

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文章：

    In a 1918 editorial, W.E.B. Du Bois advised African Americans to stop agitating for equality and to proclaim their solidarity with White Americans for the duration of the First World War. The editorial surprised many African Americans who viewed Du Bois as an uncompromising African American leader and a chief opponent of the accommodationist tactics urged by Booker, T.Washington. In fact, however, Du Bois often shifted positions along the continuum between Washington and confrontationists such as William Trotter. In 1895, when Washington called on African Americans to concentrate on improving their communities instead of opposing discrimination and agitating for political rights, Du Bois praised Washington's speech. In 1903, however, Du Bois aligned himself with Trotter, Washington's militant opponent, less for ideological reasons than because Trotter had described to him Washington's efforts to silence those in the African American press who opposed Washington's positions.reflected not a change in his long-term goals but rather a pragmatic response in the face of social pressure: government officials had threatened African American journalists with censorship if they continued to voice grievances. Furthermore, Du Bois believed that African Americans' contributions to past war efforts had brought them some legal and political advances. Du Bois' accommodationism did not last, however. Upon learning of systematic discrimination experienced by African Americans in the military, he called on them to "return fighting" from the war.

题目：

The passage is primarily concerned with

选项:

A、identifying historical circumstances that led Du Bois to alter his long-term goals.
B、defining 'accommodationism' and show-ing how Du Bois used this strategy to achieve certain goals
C、accounting for a particular position adopted by Du Bois during the First World War.
D、contesting the view that Du Bois was sig-nificantly influenced by either Washington or Trotter.
E、assessing the effectiveness of a strategy that Du Bois urged African Americans to adopt.

答案:

C
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[Problem Solving]

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题目：

A coin that is tossed will land heads or tails, and each outcome has equal probability. What is the probability that the coin will land heads at least once on two tosses?

选项:

A、1/4
B、1/3
C、1/2
D、2/3
E、3/4

答案:

E
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[Reading Comprehension]

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文章：

Line         There are recent reports of apparently drastic
  declines in amphibian populations and of extinctions
  of a number of the world’s endangered amphibian
  species. These declines, if real, may be signs of a
(5) general trend toward extinction, and many
  environmentalists have claimed that immediate
  environmental action is necessary to remedy
  this “amphibian crisis,” which, in their view, is an
  indicator of general and catastrophic environmental
(10) degradation due to human activity.
       To evaluate these claims, it is useful to make a
  preliminary distinction that is far too often ignored.
  A declining population should not be confused with
  an endangered one. An endangered population is
(15) always rare, almost always small, and, by definition,
  under constant threat of extinction even without a
  proximate cause in human activities. Its disappearance,
  however unfortunate, should come as no great
  surprise. Moreover, chance events—which may
(20) indicate nothing about the direction of trends in
  population size—may lead to its extinction. The
  probability of extinction due to such random factors
  depends on the population size and is independent of
  the prevailing direction of change in that size.
(25)      For biologists, population declines are potentially
  more worrisome than extinctions. Persistent
  declines, especially in large populations, indicate a
  changed ecological context. Even here, distinctions
  must again be made among declines that are only
(30) apparent (in the sense that they are part of habitual
  cycles or of normal fluctuations), declines that take
  a population to some lower but still acceptable
  level, and those that threaten extinction (e.g., by
  taking the number of individuals below the minimum
(35) viable population). Anecdotal reports of population
  decreases cannot distinguish among these
  possibilities, and some amphibian populations have
  shown strong fluctuations in the past.
       It is indisputably true that there is simply not
(40) enough long-term scientific data on amphibian
  populations to enable researchers to identify real
  declines in amphibian populations. Many fairly
  common amphibian species declared all but extinct
  after severe declines in the 1950s and 1960s
(45) have subsequently recovered, and so might
  the apparently declining populations that have
  generated the current appearance of an amphibian
  crisis. Unfortunately, long-term data will not soon
  be forthcoming, and postponing environmental
(50) action while we wait for it may doom species and
  whole ecosystems to extinction.


题目：

It can be inferred from the passage that the author believes which of the following to be true of the environmentalists mentioned in lines 5–6 ?

选项:

A、They have wrongly chosen to focus on anecdotal reports rather than on the long-term data that are currently available concerning amphibians.
B、Their recommendations are flawed because their research focuses too narrowly on a single category of animal species.
C、Their certainty that population declines in general are caused by environmental degradation is not warranted.
D、They have drawn premature conclusions concerning a crisis in amphibian populations from recent reports of declines.
E、They have overestimated the effects of chance events on trends in amphibian populations.

答案:

D
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[Reading Comprehension]

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文章：

Line         Ecoefficiency (measures to minimize environmental
  impact through the reduction or elimination of waste
  from production processes) has become a goal for
  companies worldwide, with many realizing significant
(5) cost savings from such innovations. Peter Senge and
  Goran Carstedt see this development as laudable
  but suggest that simply adopting ecoefficiency
  innovations could actually worsen environmental
  stresses in the future. Such innovations reduce
(10) production waste but do not alter the number of
  products manufactured nor the waste generated
  from their use and discard; indeed, most companies
  invest in ecoefficiency improvements in order to
  increase profits and growth. Moreover, there is no
(15) guarantee that increased economic growth from
  ecoefficiency will come in similarly ecoefficient
  ways, since in today’s global markets, greater profits
  may be turned into investment capital that could easily
  be reinvested in old-style eco-inefficient industries.
(20) Even a vastly more ecoefficient industrial system
  could, were it to grow much larger, generate more
  total waste and destroy more habitat and species
  than would a smaller, less ecoefficient economy.
  Senge and Carstedt argue that to preserve the global
(25) environment and sustain economic growth,
  businesses must develop a new systemic approach
  that reduces total material use and total accumulated
  waste. Focusing exclusively on ecoefficiency, which
  offers a compelling business case according to
(30) established thinking, may distract companies from
  pursuing radically different products and business
  models.


题目：

The passage implies that which of the following is a possible consequence of a company’s adoption of innovations that increase its ecoefficiency?

选项:

A、Company profits resulting from such innovations may be reinvested in that company with no guarantee that the company will continue to make further improvements in ecoefficiency.
B、Company growth fostered by cost savings from such innovations may allow that company to manufacture a greater number of products that will be used and discarded, thus worsening environmental stress.
C、A company that fails to realize significant cost savings from such innovations may have little incentive to continue to minimize the environmental impact of its production processes.
D、A company that comes to depend on such innovations to increase its profits and growth may be vulnerable in the global market to competition from old-style eco-inefficient industries.
E、A company that meets its ecoefficiency goals is unlikely to invest its increased profits in the development of new and innovative ecoefficiency measures.

答案:

B
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[Critical Reasoning]

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题目：

While many people think of genetic manipulation of food crops as being aimed at developing larger and larger plant varieties, some plant breeders have in fact concentrated on discovering or producing dwarf varieties, which are roughly half as tall as normal varieties.

Which of the following would, if true, most help to explain the strategy of the plant breeders referred to above?

选项:

A、Plant varieties used as food by some are used as ornamentals by others.
B、The wholesale prices of a given crop decrease as the supply of it increases.
C、Crops once produced exclusively for human consumption are often now used for animal feed.
D、Short plants are less vulnerable to strong wind and heavy rains.
E、Nations with large industrial sectors tend to consume more processed grains.

答案:

D
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[Data Sufficiency]

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题目：

In quadrilateral ABCD, is angle BCD a right angle?
(1)   Angle ABC is a right angle.
(2) Angle ADC is a right angle.

选项:

答案:

E
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[Reading Comprehension]

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文章：

Line        Conodonts, the spiky phosphatic remains (bones
 and teeth composed of calcium phosphate) of
 tiny marine animals that probably appeared about
 520 million years ago, were once among the most
(5)controversial of fossils. Both the nature of the
 organism to which the remains belonged and the
 function of the remains were unknown. However,
 since the 1981 discovery of fossils preserving not
 just the phosphatic elements but also other remains
(10)of the tiny soft-bodied animals (also called conodonts)
 that bore them, scientists' reconstructions of the
 animals' anatomy have had important implications
 for hypotheses concerning the development of the
 vertebrate skeleton.
(15)     The vertebrate skeleton had traditionally been
 regarded as a defensive development, champions of
 this view postulating that it was only with the much
 later evolution of jaws that vertebrates became
 predators. The first vertebrates, which were soft-
(20)bodied, would have been easy prey for numerous
 invertebrate carnivores, especially if these early
 vertebrates were sedentary suspension feeders.
 Thus, traditionalists argued, these animals developed
 coverings of bony scales or plates, and teeth were
(25)secondary features, adapted from the protective
 bony scales. Indeed, external skeletons of this
 type are common among the well-known fossils of
 ostracoderms, jawless vertebrates that existed from
 approximately 500 to 400 million years ago.
(30)However, other paleontologists argued that many of
 the definitive characteristics of vertebrates, such as
 paired eyes and muscular and skeletal adaptations
 for active life, would not have evolved unless the
(35)first vertebrates were predatory. Teeth were more
 primitive than external armor according to this view,
 and the earliest vertebrates were predators.
      The stiffening notochord along the back of the
 body, V-shaped muscle blocks along the sides,
(40)and posterior tail fins help to identify conodonts as
 among the most primitive of vertebrates. The lack of
 any mineralized structures apart from the elements
 in the mouth indicates that conodonts were more
 primitive than the armored jawless fishes such as the
(45)ostracoderms. It now appears that the hard parts that
 first evolved in the mouth of an animal improved its
 efficiency as a predator, and that aggression rather
 than protection was the driving force behind the origin
 of the vertebrate skeleton.

题目：

According to the passage, the anatomical evidence provided by the preserved soft bodies of conodonts led scientists to conclude that

选项:

答案:

D
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[Critical Reasoning]

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文章：

Kitchen magazine plans to license the use of its name by a line of cookware. For a magazine, licensing the use of its name for products involves some danger, since if the products disappoint consumers, the magazine's reputation suffers, with consequent reductions in circulation and advertising. However, experts have evaluated the cookware and found it superior to all other cookware advertised in Kitchen. Therefore, Kitchen can collect its licensing fee without endangering its other revenues.

题目：

The argument above assumes which of the following?

选项:

A、No other line of cookware is superior to that which will carry the Kitchen name. Kitchen will not license the use of its name for any products other than the line of cookware. 
B、Makers of cookware will not find Kitchen a less attractive advertising vehicle because the magazine's name is associated with a competing product. 
C、Consumers who are not regular readers of Kitchen magazine will be attracted to the cookware by the Kitchen name.
D、Kitchen is one of the most prestigious cooking-related magazines.

答案:

C
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[Critical Reasoning]

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题目：

The Calex Telecommunications Company is planning to introduce cellular telephone service into isolated coastal areas of Caladia, a move which will require considerable investment.  However, the only significant economic activity in these areas is small-scale coffee farming, and none of the coffee farmers make enough money to afford the monthly service fees that Calex would have to charge to make a profit.  Nevertheless, Calex contends that making the service available to these farmers will be profitable.
Which of the following, if true, provides the strongest support for Calex's contention?

选项:

A、Currently, Caladian coffee farmers are forced to sell their coffee to local buyers at whatever price those buyers choose to pay because the farmers are unable to remain in contact with outside buyers who generally offer higher prices.
B、In the coastal areas of Caladia where Calex proposes to introduce cellular telephone service, there is currently no fixed-line telephone service because fixed-line companies do not believe that they could recoup their investment.
C、A cellular telephone company can break even with a considerably smaller number of subscribers than a fixed-line company can, even in areas such as the Caladian coast, where there is no difficult terrain to drive up the costs of installing fixed lines.
D、Calex bases its monthly fees for cellular telephone service in a given region partly on the cost of installing the necessary equipment to provide the service there.
E、Calex has for years made a profit on cellular telephone service in Caladia's capital city, which is not far from the coastal region.

答案:

A
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[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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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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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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[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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2996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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[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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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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Analytical!
请问may老师，这题该用什么思路来做？
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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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