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题目：

The list of animals that exhibits a preference of either using the right or the left hand (i.e., claw, paw, or foot) has been expanded to include the lower vertebrates.

选项:

A、 exhibits a preference of either using the right or the left hand (i.e., claw, paw, or foot) has been expanded to include
B、 exhibits the preference to use either the right or the left hand (i.e., claw, paw, or foot) has been expanded and includes
C、 exhibit a preference in either using the right or the left hand (i.e., claw, paw, or foot) has been expanded to include
D、 exhibit a preference for using either the right or the left hand (i.e., claw, paw, or foot) has been expanded to include
E、 exhibit the preference as to either using the right or the left hand (i.e., claw, paw, or foot) has been expanded and includes

答案:

D
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题目：

Scientists believe that unlike the males of most species of moth, the male whistling moths of Nambung, Australia, call female moths to them by the use of acoustical signals, but not olfactory ones, and they attract their mates during the day, rather than at night.

选项:

A、by the use of acoustical signals, but not olfactory ones, and they attract
B、by the use of acoustical signals instead of using olfactory ones, and attracting
C、by using acoustical signals, not using olfactory ones, and by attracting
D、using acoustical signals, rather than olfactory ones, and attract
E、using acoustical signals, but not olfactory ones, and attracting

答案:

D
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[Critical Reasoning]

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题目：

Magazine Publisher:  Our magazine does not have a liberal bias.  It is true that when a book review we had commissioned last year turned out to express distinctly conservative views, we did not publish it until we had also obtained a second review that took a strongly liberal position.  Clearly, however, our actions demonstrate not a bias in favor of liberal views but rather a commitment to a balanced presentation of diverse opinions.
 
Determining which of the following would be most useful in evaluating the cogency of the magazine publisher's response?

选项:

A、Whether any other magazines in which the book was reviewed carried more than one review of the book
B、Whether the magazine publishes unsolicited book reviews as well as those that it has commissioned
C、Whether in the event that a first review commissioned by the magazine takes a clearly liberal position the magazine would make any efforts to obtain further reviews
D、Whether the book that was the subject of the two reviews was itself written from a clearly conservative or a clearly liberal point of view
E、Whether most of the readers of the magazine regularly read the book reviews that the magazine publishes

答案:

C
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题目：

To estimate the expansion rate of the universe is a notoriously difficult problem because there is a lack of a single yardstick that all distances can be measured by.

选项:

A、To estimate the expansion rate of the universe is a notoriously difficult problem because there is a lack of a single yardstick that all distances can be measured by.
B、Estimating the expansion rate of the universe is a notoriously difficult problem because there is no single yardstick by which all distances can be measured.
C、Because there is a lack of a single yardstick to measure all distances by, estimating the expansion rate of the universe is a notoriously difficult problem.
D、A notoriously difficult problem is to estimate the expansion rate of the universe because a single yardstick is lacking by which all distances can be measured.
E、It is a notoriously difficult problem to estimate the expansion rate of the universe because by no single yardstick can all distances be measured.

答案:

B
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题目：

Tiger sharks are common in the waters surrounding Tenare Island.  Usually tiger sharks feed on smaller sharks, but sometimes they have attacked tourists swimming and surfing at Tenare's beaches.  This has hurt Tenare's tourism industry, which is second only to its fishing industry in annual revenues.  In order to help the economy, therefore, the mayor of the island has proposed an ongoing program to kill any tiger sharks within a mile of the beaches.
 
Which of the following, if true, most strongly calls into question the likelihood that implementation of the mayor's proposal will have the desired consequence?

选项:

A、Even if not all the tiger sharks that come close to the beaches are killed, the existence of the program would reassure tourists.
B、Business owners who depend on tourism are willing to pay most of the cost of implementing the program.
C、Tourists come to Tenare Island for its beaches, even though the island features a number of other tourist attractions.
D、The small sharks on which tiger sharks prey feed on fish that are commercially important to the island's fisheries.
E、Not all tourists who come to Tenare Island enjoy swimming or surfing.

答案:

D
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题目：

In many corporations, employees are being replaced by automated equipment in order to save money.  However, many workers who lose their jobs to automation will need government assistance to survive, and the same corporations that are laying people off will eventually pay for that assistance through increased taxes and unemployment insurance payments.
 
Which of the following, if true, most strengthens the author's argument?

选项:

A、Many workers who have already lost their jobs to automation have been unable to find new jobs.
B、Many corporations that have failed to automate have seen their profits decline.
C、Taxes and unemployment insurance are paid also by corporations that are not automating.
D、Most of the new jobs created by automation pay less than the jobs eliminated by automation did.
E、The initial investment in machinery for automation is often greater than the short-term savings in labor costs.

答案:

A
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题目：

Two centuries ago, Tufe Peninsula became separated form the mainland, isolating on the newly formed Tufe Island a population of Turfil sunflowers.  This population's descendants grow to be, on average, 40 centimeters shorter than Turfil sunflowers found on the mainland.  Tufe Island is significantly drier than Tufe Peninsula was.  So the current average height of Tufe's Turfil sunflowers is undoubtedly at least partially attributable to changes in Tufe's environmental conditions.
 
Which of the following is an assumption on which the argument depends?

选项:

A、There are no types of vegetation on Tufe Island that are known to benefit from dry conditions.
B、There were about as many Turfil sunflowers on Tufe Peninsula two centuries ago as there are on Tufe Island today.
C、The mainland's environment has not changed in ways that have resulted in Turfil sunflowers on the mainland growing to be 40 centimeters taller than they did two centuries ago.
D、The soil on Tufe Island, unlike that on the mainland, lacks important nutrients that help Turfil sunflowers survive and grow tall in a dry environment.
E、The 40-centimeter height difference between the Turfil sunflowers on Tufe Island and those on the mainland is the only difference between the two populations.

答案:

C
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题目：

Unlike the nests of leaf cutters and most other ants, situated underground or in pieces of wood, raider ants make a portable nest by entwining their long legs to form “curtains” of ants that hang from logs or boulders, providing protection for the queen and the colony larvae and pupae.

选项:

A、the nests of leaf cutters and most other ants,
B、the nests of leaf cutters and most other ants, which are
C、leaf cutters and most other ants, whose nests are
D、leaf cutters and most other ants in having nests
E、those of leaf cutters and most other ants with nests

答案:

C
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[Reading Comprehension]

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文章：

    Over the last 150 years, large stretches of salmon habitat have been eliminated by human activity: mining, livestock grazing, timber harvesting, and agriculture as well as recreational and urban development. The numerical effect is obvious: there are fewer salmon in degraded regions than in pristine ones; however, habitat loss also has the potential to reduce genetic diversity. This is most evident in cases where it results in the extinction of entire salmon populations. Indeed, most analysts believe that some kind of environmental degradation underlies the demise of many extinct salmon populations. Although some rivers have been recolonized, the unique genes of the original populations have been lost.

    Large-scale disturbances in one locale also have the potential to alter the genetic structure of populations in neighboring areas, even if those areas have pristine habitats. Why? Although the homing instinct of salmon to their natal stream is strong, a fraction of the fish returning from the sea(rarely more than 15 percent) stray and spawn in nearby streams. Low levels of straying are crucial, since the process provides a source of novel genes and a mechanism by which a location can be repopulated should the fish there disappear. Yet high rates of straying can be problematic because misdirected fish may interbreed with the existing stock to such a degree that any local adaptations that are present become diluted. Straying rates remain relatively low when environmental conditions are stable, but can increase dramatically when streams suffer severe disturbance. The 1980 volcanic eruption of Mount Saint Helens, for example, sent mud and debris into several tributaries of the Columbia River. For the next couple of years, steelhead trout (a species included among the salmonids) returning from the sea to spawn were forced to find alternative streams. As a consequence, their rates of straying, initially 16 percent, rose to more than 40 percent overall.

    Although no one has quantified changes in the rate of straying as a result of the disturbances caused by humans, there is no reason to suspect that the effect would be qualitatively different than what was seen in the aftermath of the Mount Saint Helens eruption. Such a dramatic increase in straying from damaged areas to more pristine streams results in substantial gene flow, which can in turn lower the overall fitness of subsequent generations.

题目：

The author mentions the "aftermath of the Mount Saint Helens eruption" (the highlighted text) most likely in order to

选项:

A、provide an example of the process that allows the repopulation of rivers whose indigenous salmon population has become extinct
B、indicate the extent to which the disturbance of salmon habitat by human activity in one stream might affect the genetic structure of salmon populations elsewhere
C、provide a standard of comparison against which the impact of human activity on the gene flow among salmon populations should be measured
D、show how salmons' homing instinct can be impaired as a result of severe environmental degradation of their natal streams
E、show why straying rates in salmon populations remain generally low except when spawning streams suffer severe environmental disturbance

答案:

C
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题目：

The spacing of the four holes on a fragment of a bone flute excavated at a Neanderthal campsite is just what is required to play the third through sixth notes of the diatonic scale—the seven-note musical scale used in much of Western music since the Renaissance. Musicologists therefore hypothesize that the diatonic musical scale was developed and used thousands of years before it was adopted by Western musicians.

Which of the following, if true, most strongly supports the hypothesis?

选项:

A、Bone flutes were probably the only musical instrument made by Neanderthals.
B、No musical instrument that is known to have used a diatonic scale is of an earlier date than the flute found at the Neanderthal campsite.
C、The flute was made from a cave-bear bone and the campsite at which the flute fragment was excavated was in a cave that also contained skeletal remains of cave bears.
D、Flutes are the simplest wind instrument that can be constructed to allow playing a diatonic scale.
E、The cave-bear leg bone used to make the Neanderthal flute would have been long enough to make a flute capable of playing a complete diatonic scale.

答案:

E
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1917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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4968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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5641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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1898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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4099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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2868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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1903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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1992浏览

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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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424414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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431551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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