问答

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[Critical Reasoning]

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题目：

Proposal:  Carbon dioxide and methane in the atmosphere block the escape of heat into space.  So emission of these "greenhouse" gases contributes to global warming.  In order to reduce global warming, emission of greenhouse gases needs to be reduced.  Therefore, the methane now emitted from open landfills should instead be burned to produce electricity.
 
Objection:  The burning of methane generates carbon dioxide that is released into the atmosphere.
 
Which of the following, if true, most adequately counters the objection made to the proposal?

选项:

A、Every time a human being or other mammal exhales, there is some carbon dioxide released into the air.
B、The conversion of methane to electricity would occur at a considerable distance from the landfills.
C、The methane that is used to generate electricity would generally be used as a substitute for a fuel that does not produce any greenhouse gases when burned.
D、Methane in the atmosphere is more effective in blocking the escape of heat from the Earth than is carbon dioxide.
E、The amount of methane emitted from the landfills could be reduced if the materials whose decomposition produces methane were not discarded, but recycled.

答案:

D
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[Problem Solving]

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题目：

When positive integer x is divided by positive integer y, the remainder is 9.  If x/y = 96.12, what is the value of y?

选项:

A、 96
B、 75
C、 48
D、 25
E、 12

答案:

B
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[Sentence Correction]

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题目：

Recent breakthroughs in technology have made it possible that high-definition digital video cameras are able to capture material with a degree of fidelity that nearly compares to 35-millimeter film and to project it digitally in theaters with no resulting loss of image quality.

选项:

A、 it possible that high-definition digital video cameras are able to capture material with a degree of fidelity that nearly compares to
B、 it possible to have high-definition digital video cameras that can capture material at a degree of fidelity almost like that with
C、 it possible for high-definition digital video cameras to capture material with a degree of fidelity nearly comparable to that of
D、 possible high-definition digital video cameras that can capture material at a degree of fidelity almost like
E、 possible high-definition digital video cameras able to capture material with a degree of fidelity that nearly compares to that with

答案:

C
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[Critical Reasoning]

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题目：

Healthy lungs produce a natural antibiotic that protects them from infection by routinely killing harmful bacteria on airway surfaces.  People with cystic fibrosis, however, are unable to fight off such bacteria, even though their lungs produce normal amounts of the antibiotic.  The fluid on airway surfaces in the lungs of people with cystic fibrosis has an abnormally high salt concentration; accordingly, scientists hypothesize that the high salt concentration is what makes the antibiotic ineffective.
 
Which of the following, if true, most strongly supports the scientists' hypothesis?

选项:

A、When the salt concentration of the fluid on the airway surfaces of healthy people is raised artificially, the salt concentration soon returns to normal.
B、A sample of the antibiotic was capable of killing bacteria in an environment with an unusually low concentration of salt.
C、When lung tissue from people with cystic fibrosis is maintained in a solution with a normal salt concentration, the tissue can resist bacteria.
D、Many lung infections can be treated by applying synthetic antibiotics to the airway surfaces.
E、High salt concentrations have an antibiotic effect in many circumstances.

答案:

C
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[Critical Reasoning]

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题目：

A recent report determined that although only three percent of drivers on Maryland highways equipped their vehicles with radar detectors, thirty-three percent of all vehicles ticketed for exceeding the speed limit were equipped with them.  Clearly, drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than are drivers who do not.
The conclusion drawn above depends on which of the following assumptions?

选项:

A、Drivers who equip their vehicles with radar detectors are less likely to be ticketed for exceeding the speed limit than are drivers who do not.
B、Drivers who are ticketed for exceeding the speed limit are more likely to exceed the speed limit regularly than are drivers who are not ticketed.
C、The number of vehicles that were ticketed for exceeding the speed limit was greater than the number of vehicles that were equipped with radar detectors.
D、Many of the vehicles that were ticketed for exceeding the speed limit were ticketed more than once in the time period covered by the report.
E、Drivers on Maryland highways exceeded the speed limit more often than did drivers on other state highways not covered in the report.

答案:

B
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[Sentence Correction]

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题目：

Like ancient Egyptian architectural materials that were recycled in the construction of ancient Greek Alexandria, so ancient Greek materials from the construction of that city were reused in subsequent centuries by Roman, Muslim, and modern builders.

选项:

A、Like ancient Egyptian architectural materials that were recycled in the construction of
B、Like recycling ancient Egyptian architectural materials to construct
C、Just as ancient Egyptian architectural materials were recycled in the construction of
D、Just as they recycled ancient Egyptian architectural materials in constructing
E、Just like ancient Egyptian architectural materials that were recycled in constructing

答案:

C
4答疑

[Reading Comprehension]

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文章：

    Earth's surface consists of rigid plates that are constantly shifting and jostling one another. Plate movements are the surface expressions of motions in the mantle—the thick shell of rock that lies between Earth's crust and its metallic core. Although the hot rock of the mantle is a solid, under the tremendous pressure of the crust and overlying rock of the mantle, it flows like a viscous liquid. The mantle's motions, analogous to those in a pot of boiling water, cool the mantle by carrying hot material to the surface and returning cooler material to the depths. When the edge of one plate bends under another and its cooler material is consumed in the mantle, volcanic activity occurs as molten lava rises from the downgoing plate and erupts through the overlying one.

    Most volcanoes occur at plate boundaries. However, certain "misplaced" volcanoes far from plate edges result from a second, independent mechanism that cools the deep interior of Earth. Because of its proximity to Earth's core, the rock at the base of the mantle is much hotter than rock in the upper mantle. The hotter the mantle rock is, the less it resists flowing. Reservoirs of this hot rock collect in the base of the mantle. When a reservoir is sufficiently large, a sphere of this hot rock forces its way up through the upper mantle to Earth's surface, creating a broad bulge in the topography. The "mantle plume" thus formed, once established, continues to channel hot material from the mantle base until the reservoir is emptied. The surface mark of an established plume is a hot spot—an isolated region of volcanoes and uplifted terrain located far from the edge of a surface plate. Because the source of a hot spot remains fixed while a surface plate moves over it, over a long period of time an active plume creates a chain of volcanoes or volcanic islands, a track marking the position of the plume relative to the moving plate. The natural history of the Hawaiian island chain clearly shows the movement of the Pacific plate over a fixed plume.

题目：

The passage is primarily concerned with discussing

选项:

A、the composition of Earth's mantle
B、how the Hawaiian Islands were created
C、what causes Earth's surface plates to move
D、two different mechanisms by which volcanoes are formed
E、why most volcanoes occur at plate boundaries

答案:

D
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[Critical Reasoning]

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题目：

Tourists have long complained that hotel accommodations in Midville are too expensive.  Starting last year, the city council, hoping to attract more tourists, lowered the hotel tax rate to 5 percent of room charges.  By the end of last year, Midville had taken in no less money from hotel taxes than it did the year before, so an examination of the hotel records will show that more tourists stayed in city hotels last year than the year before.
 
Which of the following is an assumption on which the argument depends?

选项:

A、The tourists who stayed in Midville hotels last year were aware that the hotel tax rate had been lowered.
B、The average price of hotel accommodations in Midville was not significantly higher than in hotels in other cities either last year or the year before.
C、The average length of a tourist's stay in Midville hotels was not longer last year than it had been the year before.
D、There were significantly more efforts to publicize Midville as a tourist destination last year than there had been the year before.
E、On average, tourists in Midville did not spend significantly more on meals last year than they did on hotels accommodations.

答案:

C
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[Sentence Correction]

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题目：

Rock samples taken from the remains of an asteroid about twice
the size of the 6-nuke-wide asteroid that eradicated the dinosaurs
has been dated to be 3.47 billion years old and thus is evidence
of the earliest known asteroid impact on Earth.

选项:

A、has been dated to be 3.47 billion years old and thus is
B、has been dated at 3.47 billion years old and thus
C、have been dated to be 3.47billion years old and thus are
D、have been dated as being 3.47 billion years old and thus
E、have been dated at 3.47 billion years old and thus are

答案:

E
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[Critical Reasoning]

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题目：

A certain mayor has proposed a fee of five dollars per day on private vehicles entering the city, claiming that the fee will alleviate the city's traffic congestion.  The mayor reasons that, since the fee will exceed the cost of round-trip bus fare from many nearby points, many people will switch from using their cars to using the bus.
 
Which of the following statements, if true, provides the best evidence that the mayor's reasoning is flawed?

选项:

A、Projected increases in the price of gasoline will increase the cost of taking a private vehicle into the city.
B、The cost of parking fees already makes it considerably more expensive for most people to take a private vehicle into the city than to take a bus.
C、Most of the people currently riding the bus do not own private vehicles.
D、Many commuters opposing the mayor's plan have indicated that they would rather endure traffic congestion than pay a five-dollar-per day fee.
E、During the average workday, private vehicles owned and operated by people living within the city account for twenty percent of the city's traffic congestion.

答案:

B
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945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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2750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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3038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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1036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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2364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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1639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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1054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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1117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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258418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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265535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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