问答

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[Critical Reasoning]

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题目：

Macrophages are cells that play a role in the response of the immune system of mice and other mammals to invasive organisms such as bacteria.  Unlike other mice, mice that are genetically incapable of making these particular cells do not show elevated levels of nitrates when infected with bacteria.
 
The statements above, if true, provide the most support for which of the following conclusions?

选项:

A、Mice that are unable either to make macrophages or to make them in sufficient numbers will protect themselves from bacterial infections in some other way.
B、Mice that show elevated levels of nitrates can easily fight off most types of bacterial infections.
C、In mice, macrophages play a role in the production of nitrates or inhibit a process by which nitrates are broken down or otherwise eliminated.
D、When a healthy mouse becomes infected with an invasive organism, the number of macrophages in the mouse's body decreases.
E、Injections of nitrates into mice that lack macrophages will not enhance the ability of these animals' immune systems to fight off infection.

答案:

C
3答疑

[Critical Reasoning]

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文章：

Editor: Articles in Gardening Magazine often spur sales of the plants they describe, particularly among people new to gardening. Accordingly, we will no longer publish articles or accept advertisements praising the beauty of rare wildflowers. Most such plants sold to gardeners have been difficult to propagate under cultivation, so plant sellers often collect them in the wild. Our new policy is part of our efforts to halt this yearly plundering of our native plant populations.

题目：

Which of the following, if true, casts the most doubt on the wisdom of the magazine's new policy as a way of pursuing the intended effect?

选项:

A、When people new to gardening buy plants, they often fail to take adequate care of the plants that they buy and become discouraged from buying those varieties again.Plant sellers who sell rare wildflowers have no reasonably inexpensive alternative way to offer their wares directly to new gardeners.
B、The demand for rare wildflowers rarely exceeds the number of such plants that can be collected in the wild by plant sellers.
C、The propagation of rare wildflowers often depends on the plants' interaction with other organisms in their environment, such as plants that create suitable soil conditions or insects and birds that disperse seeds.
D、Revenues from sales of plants collected in the wild are supporting the discovery of new low-cost techniques enabling rare wildflowers to be readily propagated in nurseries. 

答案:

E
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[Sentence Correction]

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题目：

For the best extraction of the flavor of saffron threads, it should be soaked in liquid after being pounded with a mortar and pestle.

选项:

A、 For the best extraction of the flavor of saffron threads, it should be soaked in liquid after being pounded
B、 To best extract their flavor, saffron threads should be soaked in liquid after pounding
C、 The best way to extract the flavor from saffron threads is soaking them in liquid after being pounded
D、 The best way to extract the flavor from saffron threads is to soak them in liquid after pounding them
E、 The flavor of saffron threads can best be extracted by soaking it in liquid after pounding it

答案:

D
3答疑

[Reading Comprehension]

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文章：

The United States government has a long-standing policy of using federal funds to keep small business viable.  The Small Business Act of 1953 authorized the Small Business Administration (SBA) to enter into contracts with government agencies having procurement powers and to arrange for fulfillment of these contracts by awarding subcontracts to small businesses.  In the mid-1960's, during the war on poverty years, Congress hoped to encourage minority entrepreneurs by directing such funding to minority businesses.  At first this funding was directed toward minority entrepreneurs with very low incomes.  A 1967 amendment to the Economic Opportunity Act directed the SBA to pay special attention to minority-owned businesses located in urban or rural areas characterized by high proportions of unemployed or low-income individuals.  Since then, the answer given to the fundamental question of who the recipients should be--the most economically disadvantaged or those with the best prospects for business success--has changed, and the social goals of the programs have shifted, resulting in policy changes.
 
The first shift occurred during the early 1970's.  While the goal of assisting the economically disadvantaged entrepreneur remained, a new goal emerged:  to remedy the effects of past discrimination.  In fact, in 1970 the SBA explicitly stated that their main goal was to increase the number of minority-owned businesses.  At the time, minorities constituted seventeen percent of the nation's population, but only four percent of the nation's self-employed.  This ownership gap was held to be the result of past discrimination.  Increasing the number of minority-owned firms was seen as a way to remedy this problem.  In that context, providing funding to minority entrepreneurs in middle- and high-income brackets seemed justified.
 
In the late 1970's, the goals of minority-business funding programs shifted again.  At the Minority Business Development Agency, for example, the goal of increasing numbers of minority-owned firms was supplanted by the goal of creating and assisting more minority-owned substantive firms with future growth potential.  Assisting manufacturers or wholesalers became far more important than assisting small service businesses.  Minority-business funding programs were now justified as instruments for economic development, particularly for creating jobs in minority communities of high unemployment.

题目：

Which of the following best describes the function of the second paragraph in the passage as a whole?

选项:

A、It narrows the scope of the topic introduced in the first paragraph.
B、It presents an example of the type of change discussed in the first paragraph.
C、It cites the most striking instance of historical change in a particular government policy.
D、It explains the rationale for the creation of the government agency whose operations are discussed in the first paragraph.
E、It presents the results of policies adopted by the federal government.

答案:

B
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[Sentence Correction]

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题目：

Performing a risky maneuver that required precision flying, not only did space shuttle astronauts retrieve an orbiting satellite, it was done simultaneously while avoiding being rear-ended by a passing ultraviolet telescope.

选项:

A、not only did space shuttle astronauts retrieve an orbiting satellite, it was done simultaneously while avoiding
B、not only was an orbiting satellite retrieved by space shuttle astronauts, but they also simultaneously avoided
C、an orbiting satellite was retrieved by space shuttle astronauts who also avoided simultaneously
D、space shuttle astronauts retrieved an orbiting satellite, simultaneously while avoiding
E、space shuttle astronauts retrieved an orbiting satellite and simultaneously avoided

答案:

E
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[Critical Reasoning]

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题目：

Certain politicians in the country of Birangi argue that a 50 percent tax on new automobiles would halt the rapid increase of automobiles on Birangi's roads and thereby slow the deterioration of Birangi's air quality.  Although most experts agree that such a tax would result in fewer Birangians buying new vehicles and gradually reduce the number of automobiles on Birangi's roads, they contend that it would have little impact on Birangi's air-quality problem.
 
Which of the following, if true in Birangi, would most strongly support the experts' contention about the effect of the proposed automobile tax on Birangi's air-quality problem?

选项:

A、Automobile emissions are the largest single source of air pollution.
B、Some of the proceeds from the new tax would go toward expanding the nonpolluting commuter rail system.
C、Currently, the sales tax on new tax on new automobiles is considerably lower than 50 percent.
D、Automobiles become less fuel efficient and therefore contribute more to air pollution as they age.
E、The scrapping of automobiles causes insignificant amounts of air pollution.

答案:

D
3答疑

[Data Sufficiency]

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题目：

What is the median number of employees assigned per project for the projects at Company Z?
(1)   25 percent of the projects at Company Z have 4 or more employees assigned to each project.
(2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project.

选项:

答案:

C
3答疑

[Reading Comprehension]

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文章：

    In recent years, Western business managers have been heeding the exhortations of business journalists and academics to move their companies toward long-term, collaborative "strategic partnerships" with their external business partners (e.g., suppliers). The experts' advice comes as a natural reaction to numerous studies conducted during the past decade that compared Japanese production and supply practices with those of the rest of the world. The link between the success of a certain well-known Japanese automaker and its effective management of its suppliers, for example, has led to an unquestioning belief within Western management circles in the value of strategic partnerships. Indeed, in the automobile sector all three United States manufacturers and most of their European competitors have launched programs to reduce their total number of suppliers and move toward having strategic partnerships with a few.

    However, new research concerning supplier relationships in various industries demonstrates that the widespread assumption of Western managers and business consultants that Japanese firms manage their suppliers primarily through strategic partnerships is unjustified. Not only do Japanese firms appear to conduct a far smaller proportion of their business through strategic partnerships than is commonly believed, but they also make extensive use of "market-exchange" relationships, in which either party can turn to the marketplace and shift to different business partners at will, a practice usually associated with Western manufacturers.

题目：

According to the passage, the advice referred to in the highlighted text was a response to which of the following?

选项:

A、A recent decrease in the number of available suppliers within the United States automobile industry
B、A debate within Western management circles during the past decade regarding the value of strategic partnerships
C、The success of certain European automobile manufacturers that have adopted strategic partnerships
D、An increase in demand over the past decade for automobiles made by Western manufacturers
E、Research comparing Japanese business practices with those of other nations

答案:

E
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[Sentence Correction]

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题目：

Scientists have recently discovered that the ultrathin, layered construction of a butterfly's wings, the same as the one making some butterflies shimmer via the phenomenon of iridescence, are enabling the insect to control how much heat energy is absorbed by its wings and how much is reflected away.

选项:

A、wings, the same as the one making some butterflies shimmer via the phenomenon of iridescence, are enabling
B、wings, which is the same one that makes some butterflies shimmer via the phenomenon of iridescence, that also enables
C、wings is the same as the one that makes some butterflies shimmer via the phenomenon of iridescence, enabling
D、wings—the same construction that makes some butterflies shimmer via the phenomenon of iridescence—also enables
E、wings—of the same construction that makes some butterflies shimmer via the phenomenon of iridescence—also enable

答案:

D
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[Sentence Correction]

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题目：

In the 1820's, anthracite coalfields opened in eastern Pennsylvania, and when canals and eventually railroads reached into the region, there were substantial supplies of coal that was exported to the nation's growing mills, forges, factories, and railways.

选项:

A、when canals and eventually railroads reached into the region, there were substantial supplies of coal that was
B、once canals and eventually railroads reaching into the region, there were substantial supplies of coal having been
C、with canals and eventually railroads reaching into the region, there had been substantial supplies of coal
D、canals and eventually railroads reached into the region, with substantial supplies of coal being
E、as canals and eventually railroads reached into the region, substantial supplies of coal were

答案:

E
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1128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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3192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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3521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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1180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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2704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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1846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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1193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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1249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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296200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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303328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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