问答

2答疑

[Reading Comprehension]

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文章：

    The system of patentgranting, which confers temporary monopolies for the exploitation of new technologies, was originally established as an incentive to the pursuit of risky new ideas. Yet studies of the most patent-conscious business of all—the semiconductor industry-suggest that firms do not necessarily become more innovative as they increase their patenting activity. Ziedonis and Hall, for example, found that investment in research and development (a reasonable proxy for innovation) did not substantially increase between 1982 and 1992, the industry's most feverish period of patenting. Instead, semiconductor firms simply squeezed more patents out of existing research and development expenditures. Moreover, Ziedonis and Hall found that as patenting activity at semiconductor firms increased in the 1980's, the consensus among industry employees was that the average quality of their firms' patents declined. Though patent quality is a difficult notion to measure, the number of times a patent is cited in the technical literature is a reasonable yardstick, and citations per semiconductor patent did decline during the 1980's. This decline in quality may be related to changes in the way semiconductor firms managed their patenting process: rather than patenting to win exclusive rights to a valuable new technology, patents were filed more for strategic purposes, to be used as bargaining chips to ward off infringement suites or as a means to block competitors' products.

题目：

The passage makes which of the following claims about patent quality in the semiconductor industry?

选项:

A、It was higher in the early 1980's than it was a decade later.
B、It is largely independent of the number of patents granted.
C、It changed between 1982 and 1992 in ways that were linked to changes in research and development expenditures.
D、It is not adequately discussed in the industry's technical literature.
E、It was measured by inappropriate means during the period from 1982 to 1992.

答案:

A
2答疑

[Critical Reasoning]

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文章：

Most of Western music since the Renaissance has been based on a seven-note scale known as the diatonic scale, but when did the scale originate? A fragment of a bone flute excavated at a Neanderthal campsite has four holes, which are spaced in exactly the right way for playing the third through sixth notes of a diatonic scale. The entire flute must surely have had more holes, and the flute was made from a bone that was long enough for these additional holes to have allowed a complete diatonic scale to be played. Therefore, the Neanderthals who made the flute probably used a diatonic musical scale.

题目：

In the argument given, the two portions in boldface play which of the following roles?

选项:

A、The first introduces evidence to support the main conclusion of the argument; the second is the main conclusion stated in the argument. The first introduces evidence to support the main conclusion of the argument; the second presents a position to which the argument is opposed.
B、The first describes a discovery as undermining the position against which the argument as a whole is directed; the second states the main conclusion of the argument. 
C、The first introduces the phenomenon that the argument as a whole seeks to explain; the second presents a position to which the argument is opposed. 
D、The first introduces the phenomenon that the argument as a whole seeks to explain; the second gives a reason to rule out one possible explanation

答案:

A
2答疑

[Problem Solving]

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题目：

A rectangular bar of length 20 feet and width 6 inches. A vertical divides the rectangle into 2 parts. This line meets the base of the rectangle at point B. The left section of the rectangle has a right inclined line from a point A on the base. It forms an angle x degrees above the base of the rectangle at point A. The right section of the rectangle has a right inclined line from a point C on the base. It forms an angle x degrees above the base of the rectangle at point C.

The figure above shows the dimensions of a rectangular board that is to be cut into four identical pieces by making cuts at points A, B, and C, as indicated. If x = 45, what is the length AB ?

(1 foot = 12 inches)

选项:

A、5 ft 6 in
B、5 ft in
C、5 ft 3 in
D、5 ft
E、4 ft 9 in

答案:

C
2答疑

[Critical Reasoning]

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题目：

The ancient Nubians inhabited an area in which typhus occurred, yet surprisingly few of their skeletons show the usual evidence of this disease.  The skeletons do show deposits of tetracycline, an antibiotic produced by a bacterium common in Nubian soil.  This bacterium can flourish on the dried grain used for making two staples of the Nubian diet, beer and bread.  Thus, tetracycline in their food probably explains the low incidence of typhus among ancient Nubians.
 
Which of the following is an assumption on which the argument relies?

选项:

A、The tetracycline deposits did not form after the bodies were buried.
B、The diseases other than typhus to which the ancient Nubians were exposed would not be affected by tetracycline.
C、Typhus is generally fatal.
D、Nubian grain became contaminated with tetracycline-producing bacteria prior to being harvested.
E、Bread and beer were the only foods eaten by the ancient Nubians which could have contained tetracycline.

答案:

A
2答疑

[Data Sufficiency]

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题目：

If x is a positive integer, is the remainder 0 when 3x + 1 is divided by 10?
(1)     x = 4n + 2, where n is a positive integer.
(2)     x ＞ 4

选项:

答案:

A
2答疑

[Data Sufficiency]

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题目：

If Line k in the xy-plane has equation y = mx + b, where m and b are constants, what is the slope of k?
(1) k is parallel to the line with equation y = (1-m)x + b +1.
(2)   k intersects the line with equation y = 2x + 3 at the point (2, 7).

选项:

答案:

A
2答疑

[Reading Comprehension]

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文章：

    Anole lizard species that occur together (sympatrically) on certain Caribbean islands occupy different habitats: some live only in the grass, some only on tree trunks, and some only on twigs. These species also differ morphologically: grass dwellers are slender with long tails, tree dwellers are stocky with long legs, twig dwellers are slender but stubby-legged. What is striking about these lizards is not that coexisting species differ in morphology and habitat use (such differences are common among closely related sympatric species), but that the same three types of habitat specialists occur on each of four islands: Puerto Rico, Cuba, Hispaniola, and Jamaica.Moreover, the Puerto Ricantwig species closely resembles the twig species of Cuba, Hispaniola, and Jamaica in morphology, habitat use, and behavior. Likewise, the specialists for other habitats are similar across the islands.

    The presence of similar species on different islands could be variously explained. An ancestral species might have adapted to exploit a particular ecological niche on one island and then traveled over water to colonize other islands. Or this ancestral species might have evolved at a time when the islands were connected, which some of these islands may once have been. After the islands separated, the isolated lizard populations would have become distinct species while also retaining their ancestors' niche adaptations. Both of these scenarios imply that specialization to each niche occurred only once. Alternatively, each specialist could have arisen independently on each of the is lands.

    If each type of specialist evolved just once, then similar specialists on different islands would be closely related. Conversely, if the specialists evolved independently on each island, then a specialist on one island would be more closely related to other types of anoles on the same island-regardless of their ecological niches-than it would be to a similar specialist on a different island.

    Biologists can infer how species are related evolutionarily by comparing DNA sequences for the same genes in different species. Species with similar DNA sequences for these genes are generally more closely related to each other than to species with less-similar DNA sequences. DNA evidence concerning the anoles led researchers to conclude that habitat specialists on one island are not closely related to the same habitat specialists elsewhere, indicating that specialists evolved independently on each island.

题目：

The passage suggests that if a grass-dwelling anole lizard species evolved on one island and then traveled over water to colonize a second island, the grass-dwelling anoles on the two islands would eventually

选项:

A、develop very different DNA sequences
B、develop into different species that are more distantly related to each other than to tree- and twig-dwelling anoles on their own islands
C、come to differ significantly from one another in habitat use
D、develop into different, but closely related, species
E、evolve significant morphological differences

答案:

D
2答疑

[Data Sufficiency]

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题目：

What is the total value of Company H's stock?
(1) Investor P owns ¼ of the shares of Company H's total stock.
(2)   The total value of Investor Q's shares of Company H's stock is $16,000.

选项:

答案:

E
2答疑

[Critical Reasoning]

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题目：

Businesses are suffering because of a lack of money available for development loans. To help businesses, the government plans to modify the income-tax structure in order to induce individual taxpayers to put a larger portion of their incomes into retirement savings accounts, because as more money is deposited in such accounts, more money becomes available to borrowers.

Which of the following, if true, raises the most serious doubt regarding the effectiveness of the government's plan to increase the amount of money available for development loans for businesses?

选项:

A、When levels of personal retirement savings increase, consumer borrowing always increases correspondingly.
B、The increased tax revenue the government would receive as a result of business expansion would not offset the loss in revenue from personal income taxes during the first year of the plan.
C、Even with tax incentives, some people will choose not to increase their levels of retirement savings.
D、Bankers generally will not continue to lend money to businesses whose prospective earnings are insufficient to meet their loan repayment schedules.
E、The modified tax structure would give all taxpayers, regardless of their incomes, the same tax savings for a given increase in their retirement savings.

答案:

A
2答疑

[Sentence Correction]

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题目：

Vivien Thomas, who had no formal medical training, in struggling against overwhelming odds, he became a cardiac surgeon and eventually to receive an honorary doctorate from Johns Hopkins University.

选项:

A、who had no formal medical training, in struggling against over whelming odds, he became
B、Having had no formal medical training, in struggling against overwhelming odds to become
C、Who, having no formal medical training, he struggled against overwhelming odds in becoming
D、Who, having had no formal medical training and struggled against overwhelming odds, became
E、Who had no formal medical training, struggled against overwhelming odds to become

答案:

E
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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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3238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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3587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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2736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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1206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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1265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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300542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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307669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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