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题目：

Which of the following most logically completes the passage?
Using new detection techniques, researchers have found trace amounts of various medicinal substances in lakes and rivers. Taken in large quantities, these substances could have serious health effects, but they are present in quantities far too low to cause any physiological response in people who drink the water or bathe in it. Nevertheless, medical experts contend that eliminating these trace amounts from the water will have public health benefits, since_____.

选项:

A、some of the medicinal substances found in lakes and rivers are harmless to humans even if taken in large quantities
B、some of the medicinal substances found in lakes and rivers can counteract possible harmful effects of other such substances found there 
C、people who develop undesirable side effects when being treated with medicines that contain these substances generally have their treatment changed 
D、most medicinal substances that reach lakes or rivers rapidly break down into harmless substances 
E、disease-causing bacteria exposed to low concentrations of certain medicinal substances can become resistant to them

答案:

E
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[Sentence Correction]

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题目：

After increasing steadily for centuries, the total annual catch of all wild fish peaked in 1989; since that time, the total catch for most species has declined or plateaued, prompting conservation efforts designed to help prevent population crashes and possible extinctions.

选项:

A、fish peaked in 1989; since that time, the total catch for most species has declined or plateaued, prompting
B、fish peaked in 1989, but with the total catch since then declining or plateauing in the case of most species, prompting
C、fish had peaked in 1989; since that time, the decline or plateau of the total catch for most species, which prompted
D、fish, which peaked in 1989, and, in the case of most species, it has declined or plateaued since, prompted
E、fish, which peaked in 1989 but has since declined or plateaued for most species, and this prompted

答案:

A
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[Reading Comprehension]

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文章：

After the Second World War, unionism in the Japanese auto industry was company-based, with separate unions in each auto company.  Most company unions played no independent role in bargaining shop-floor issues or pressing autoworkers' grievances.  In a 1981 survey, for example, fewer than 1 percent of workers said they sought union assistance for work-related problems, while 43 percent said they turned to management instead.  There was little to distinguish the two in any case: most union officers were foremen or middle-level managers, and the union's role was primarily one of passive support for company goals.  Conflict occasionally disrupted this cooperative relationship--one company union's opposition to the productivity campaigns of the early 1980s has been cited as such a case.  In 1986, however, a caucus led by the Foreman's Association forced the union's leadership out of office and returned the union's policy to one of passive cooperation.  In the United States, the potential for such company unionism grew after 1979, but it had difficulty taking hold in the auto industry, where a single union represented workers from all companies, particularly since federal law prohibited foremen from joining or leading industrial unions.
 
The Japanese model was often invoked as one in which authority decentralized to the shop floor empowered production workers to make key decisions.  What these claims failed to recognize was that the actual delegation of authority was to the foreman, not the workers.  The foreman exercised discretion over job assignments, training, transfers, and promotions; worker initiative was limited to suggestions that fine-tuned a management-controlled production process.  Rather than being proactive, Japanese workers were forced to be reactive, the range of their responsibilities being far wider than their span of control.  For example, the founder of one production system, Taichi Ohno, routinely gave department managers only 90 percent of the resources needed for production.  As soon as workers could meet production goals without working overtime, 10 percent of remaining resources would be removed.  Because the "OH! NO!" system continually pushed the production process to the verge of breakdown in an effort to find the minimum resource requirement, critics described it as "management by stress."

题目：

It can be inferred that the author of the passage sees which of the following as the primary advantage to companies in implementing the "OH! NO!" system?

选项:

A、It permitted the foreman to take initiative.
B、It minimized the effort required to produce automobiles.
C、It ensured that production costs would be as low as possible.
D、It allowed the foreman to control the production process.
E、It required considerable worker empowerment to achieve managers' goals.

答案:

C
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[Sentence Correction]

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题目：

Rising inventories, when unaccompanied correspondingly by increases in sales, can lead to production cutbacks that would hamper economic growth.

选项:

A、when unaccompanied correspondingly by increases in sales, can lead
B、when not accompanied by corresponding increases in sales, possibly leads
C、when they were unaccompanied by corresponding sales increases, can lead
D、if not accompanied by correspondingly increased sales, possibly leads
E、if not accompanied by corresponding increases in sales, can lead

答案:

E
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题目：

A leading figure in the Scottish Enlightenment, Adam Smith's two major books are to democratic capitalism what Marx's Das Kapital is to socialism.

选项:

A、Adam Smith's two major books are to democratic capitalism what
B、Adam Smith's two major books are to democratic capitalism like
C、Adam Smith's two major books are to democratic capitalism just as
D、Adam Smith wrote two major books that are to democratic capitalism similar to
E、Adam Smith wrote two major books that are to democratic capitalism what

答案:

E
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[Critical Reasoning]

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题目：

Which of the following most logically completes the argument?

In a typical year, Innovair’s airplanes are involved in 35 collisions while parked or being towed in airports, with a resulting yearly cost of $1,000,000 for repairs.

To reduce the frequency of ground collisions, Innovair will begin giving its ground crews additional training, at an annual cost of $500,000. Although this will cut the number of ground collisions by about half at best, the drop in repair costs can be expected to be much greater, since __________.

选项:

A、most ground collisions happen when ground crews are rushing to minimize the time a delayed airplane spends on the ground
B、a ground collision typically occurs when there are no passengers on the airplane
C、the additional training will focus on helping ground crews avoid those kinds of ground collisions that cause the most costly damage
D、the $500,000 cost figure for the additional training of ground crews includes the wages that those crews will earn during the time spent in actual training
E、most ground collisions have been caused by the least experienced ground-crew members

答案:

C
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[Critical Reasoning]

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题目：

 The news media is often accused of being willing to do anything for ratings. However, recent action by a television network indicates that the news media is sometimes guided by moral principle. This network had discovered through polling voters on the east coast that the Republican candidate for President had garnered enough votes to ensure victory before the polls closed on the west coast. However, the network withheld this information until the polls on the west coast closed so that the information would not affect the outcome of key congressional races.
Which one of the following most strengthens the argument? 

选项:

A、The network had endorsed the Republican candidate for President.
B、The network expected its ratings to increase if it predicted the winner of the presidential race, and to decrease if did not predict the winner.
C、A rival network did predict a winner of the presidential race before the polls on the west coast closed.
D、The network believed that it would receive higher ratings by not predicting the winner of the presidential race.
E、The network feared that predicting the winner of the presidential race could so anger Congress that it might enact legislation preventing all future polling outside of voting centers.

答案:

B
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[Reading Comprehension]

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文章：

After evidence was obtained in the 1920s that the universe is expanding, it became reasonable to ask: Will the universe continue to expand indefinitely, or is there enough mass in it for the mutual attraction of its constituents to bring this expansion to a halt? It can be calculated that the critical density of matter needed to brake the expansion and "close" the universe is equivalent to three hydrogen atoms per cubic meter. But the density of the observable universe-luminous matter in the form of galaxies-comes to only a fraction of this. If the expansion of the universe is to stop, there must be enough invisible matter in the universe to exceed the luminous matter in density by a factor of roughly 70.

Our contribution to the search for this "missing matter" has been to study the rotational velocity of galaxies at various distances from their center of rotation. It has been known for some time that outside the bright nucleus of a typical spiral galaxy luminosity falls off rapidly with distance from the center. If luminosity were a true indicator of mass, most of the mass would be concentrated toward the center. Outside the nucleus the rotational velocity would decrease geometrically with distance from the center, in conformity with Kepler's law. Instead we have found that the rotational velocity in spiral galaxies either remains constant with increasing distance from the center or increases slightly. This unexpected result indicates that the falloff in luminous mass with distance from the center is balanced by an increase in nonluminous mass.

Our findings suggest that as much as 90 percent of the mass of the universe is not radiating at any wavelength with enough intensity to be detected on the Earth. Such dark matter could be in the form of extremely dim stars of low mass, of large planets like Jupiter, or of black holes, either small or massive. While it has not yet been determined whether this mass is sufficient to close the universe, some physicists consider it significant that estimates are converging on the critical value.

题目：

The authors’ study indicates that, in comparison with the outermost regions of a typical spiral galaxy, the region just outside the nucleus can be characterized as having

选项:

A、higher rotational velocity and higher luminositylower rotational velocity and higher luminosity
B、lower rotational velocity and lower luminosity
C、similar rotational velocity and higher luminosity
D、similar rotational velocity and similar luminosity

答案:

D
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[Reading Comprehension]

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文章：

Line         Most attempts by physicists to send particles
  faster than the speed of light involve a remarkable
  phenomenon called quantum tunneling, in which
  particles travel through solid barriers that appear
(5) to be impenetrable. If you throw a ball at a wall,
  you expect it to bounce back, not to pass straight
  through it. Yet subatomic particles perform the
  equivalent feat. Quantum theory says that there is a
  distinct, albeit small, probability that such a particle
(10) will tunnel its way through a barrier; the probability
  declines exponentially as the thickness of the
  barrier increases. Though the extreme rapidity of
  quantum tunneling was noted as early as 1932,
  not until 1955 was it hypothesized—by Wigner and
(15) Eisenbud—that tunneling particles sometimes
  travel faster than light. Their grounds were
  calculations that suggested that the time it takes a
  particle to tunnel through a barrier increases with
  the thickness of the barrier until tunneling time
(20) reaches a maximum; beyond that maximum,
  tunneling time stays the same regardless of
  barrier thickness. This would imply that once
  maximum tunneling time is reached, tunneling
  speed will increase without limit as barrier thickness
(25) increases. Several recent experiments have
  supported this hypothesis that tunneling particles
  sometimes reach superluminal speed. According to
  measurements performed by Raymond Chiao and
  colleagues, for example, photons can pass through
(30) an optical filter at 1.7 times the speed of light.


题目：

The passage implies that if tunneling time reached no maximum in increasing with barrier thickness, then

选项:

A、tunneling speed would increase with barrier thickness
B、tunneling speed would decline with barrier thickness
C、tunneling speed would vary with barrier thickness
D、tunneling speed would not be expected to increase without limit
E、successful tunneling would occur even less frequently than it does

答案:

D
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[Reading Comprehension]

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文章：

Line        In their study of whether offering a guarantee of
 service quality will encourage customers to visit a
 particular restaurant, Tucci and Talaga have found
 that the effect of such guarantees is mixed. For
(5)higher-priced restaurants, there is some evidence
 that offering a guarantee increases the likelihood of
 customer selection, probably reflecting the greater
 financial commitment involved in choosing an
 expensive restaurant. For lower-priced restaurants,
(10)where one expects less assiduous service, Tucci and
 Talaga found that a guarantee could actually have a
 negative effect: a potential customer might think that
 a restaurant offering a guarantee is worried about
 its service. Moreover, since customers understand a
(15)restaurant’s product and know what to anticipate in
 terms of service, they are empowered to question its
 quality. This is not generally true in the case of skilled
 activities such as electrical work, where, consequently,
 a guarantee might have greater customer appeal.
(20)     For restaurants generally, the main benefit of
 a service guarantee probably lies not so much in
 customer appeal as in managing and motivating staff.
 Staff members would know what service standards
 are expected of them and also know that the success
(25)of the business relies on their adhering to those
 standards. Additionally, guarantees provide some
 basis for defining the skills needed for successful
 service in areas traditionally regarded as unskilled,
 such as waiting tables.


题目：

It can be inferred that the author of the passage would agree with which of the following statements about the appeal of service guarantees to customers?

选项:

A、which made it easier for them
B、 which makes it easier for it
C、 thus making it easier for them
D、thus making it easier for the ant
E、thereby, it was made easier for the ant

答案:

C
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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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[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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[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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[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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[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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