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题目：

Scientists typically do their most creative work before the age of forty.  It is commonly thought that this happens because aging by itself brings about a loss of creative capacity.  However, a study has found that almost all scientists who produce highly creative work beyond the age of forty entered their fields late and less than a dozen years before their creative breakthroughs.  Since creative breakthroughs by scientists under forty also generally occur within a dozen years of the scientist's entry into the field, the study's finding strongly suggests that the real reason why scientists over forty rarely produce highly creative work is not due to age but rather because most have spent too long in their fields.
 
In the argument given, the two portions in boldface play which of the following roles?

选项:

A、The first is the position that the argument as a whole defends; the second is evidence that is advanced as part of that defense.
B、The first and second are both claims that have been advanced in support of a position that the argument as a whole opposes.
C、The first is an explanation that the argument challenges; the second provides evidence in support of a competing explanation that the argument defends.
D、The first is an explanation that the argument challenges; the second is evidence that has been used against an alternative explanation that the argument defends.
E、The first is an explanation that the argument defends; the second is evidence that has been used to challenge that explanation.

答案:

C
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题目：

Urban air contains more sulfur dioxide than does rural air, and plants in cities typically grow more slowly than do plants in rural areas.  In an experiment to see how much of the difference in growth is due to sulfur dioxide, classes in an urban and a rural school grew plants in greenhouses at their schools and filtered the greenhouse air to eliminate sulfur dioxide.  Plants in the urban greenhouse grew more slowly than those in the rural greenhouse.
 
Which of the following, if true, would it be most important to take into account in evaluating the result?

选项:

A、The urban school was located in a part of the city in which levels of sulfur dioxide in the air were usually far lower than is typical for urban areas.
B、At both schools, the plants in the greenhouses grew much more quickly than did plants planted outdoors in plots near the greenhouses.
C、The urban class conducting the experiment was larger than the rural class conducting the experiment.
D、Heavy vehicular traffic such as is found in cities constantly deposits grime on greenhouse windows, reducing the amount of light that reaches the plants inside.
E、Because of the higher levels of sulfur dioxide in the air at the urban school, the air filters for the urban school's greenhouse were changed more frequently than were those at the rural school.

答案:

D
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题目：

A researcher plans to identify each participant in a certain medical experiment with a code consisting of either a single letter or a pair of distinct letters written in alphabetic order. What is the least number of letters that can be used if there are 12 participants, and each participant is to receive a different code?

选项:

A、4
B、5
C、6
D、7
E、8

答案:

B
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题目：

Sales of telephones have increased dramatically over the last year. In order to take advantage of this increase, Mammoth Industries plans to expand production of its own model of telephone, while continuing its already very extensive advertising of this product.
 
Which of the following, if true, provides most support for the view that Mammoth Industries cannot increase its sales of telephones by adopting the plan outlined above?

选项:

A、Although it sells all of the telephones that it produces, Mammoth Industries' share of all telephone sales has declined over the last year.
B、Mammoth Industries' average inventory of telephones awaiting shipment to retailers has declined slightly over the last year.
C、Advertising has made the brand name of Mammoth Industries' telephones widely known, but few consumers know that Mammoth Industries owns this brand.
D、Mammoth Industries' telephone is one of three brands of telephone that have together accounted for the bulk of the last year's increase in sales.
E、Despite a slight decline in the retail price, sales of Mammoth Industries' telephones have fallen in the last year.

答案:

E
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题目：

Outbreaks of Rift Valley fever occur irregularly in East Africa, several years apart.  When outbreaks do occur, they kill thousands of cattle.  A livestock vaccine against the disease exists but is rarely used.  It is too expensive for farmers to use routinely, and since it is not effective until a month after vaccination, administering it after an outbreak begins helps very little.  Nevertheless, experts predict that use of the vaccine will increase significantly within the next few years.
 
Which of the following, if true, provides the strongest justification for the experts' prediction?

选项:

A、Rift Valley fever is spread by mosquitoes, but each outbreak is so widespread that it is impractical to control it by using insecticides.
B、When an outbreak of Rift Valley fever occurs, unaffected countries often refuse to import livestock from the countries affected by the outbreak.
C、It would take less than a month for producers of the vaccine to adjust their production operations to cope with a large increase in demand.
D、Many cattle farmers in East Africa are nomadic or live in remote villages, and such farmers, who have little access to modern veterinary medicine, are particularly hard hit by outbreaks of Rift Valley fever.
E、Recently published research has shown that certain identifiable climatic conditions are almost invariably followed, within two to five months, by an outbreak of Rift Valley fever.

答案:

E
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[Sentence Correction]

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题目：

Deserts are inhabited with several distinct animal species, with each their own method of adapting to long periods of moisture shortage.

选项:

A、with several distinct animal species, with each their
B、with distinctly several animal species, each with its 
C、by several distinct animal species, each with its 
D、by several distinct animal species, having each its 
E、by several distinct animal species, that each has their

答案:

C
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题目：

People who do regular volunteer work tend to live longer, on average, than people who do not. It has been found that “doing good,” a category that certainly includes volunteer work, releases endorphins, the brain’s natural opiates, which induce in people a feeling of well-being. Clearly, there is a connection: Regular releases of endorphins must in some way help to extend people’s lives.

Which of the following, if true, most seriously undermines the force of the evidence given as support for the hypothesis that endorphins promote longevity?

选项:

A、People who do regular volunteer work are only somewhat more likely than others to characterize the work they do for a living as “doing good.”
B、Although extremely high levels of endorphins could be harmful to health, such levels are never reached as a result of the natural release of endorphins.
C、There are many people who have done some volunteer work but who do not do such work regularly.
D、People tend not to become involved in regular volunteer work unless they are healthy and energetic to begin with.
E、Releases of endorphins are responsible for the sense of well-being experienced by many long-distance runners while running.

答案:

D
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题目：

Thelonious Monk, who was a jazz pianist and composer, produced a body of work both rooted in the stride-piano tradition of Willie (The Lion) Smith and Duke Ellington, yet in many ways he stood apart from the mainstream jazz repertory.
 

选项:

A、Thelonious Monk, who was a jazz pianist and composer, produced a body of work both rooted
B、Thelonious Monk, the jazz pianist and composer, produced a body of work that was rooted both
C、Jazz pianist and composer Thelonious Monk, who produced a body of work rooted
D、Jazz pianist and composer Thelonious Monk produced a body of work that was rooted
E、Jazz pianist and composer Thelonious Monk produced a body of work rooted both

答案:

D
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题目：

If a code word is defined to be a sequence of different letters chosen from the 10 letters A , B , C , D , E , F , G , H , I , and J , what is the ratio of the number of 5-letter code words to the number of 4-letter code words?

选项:

A、5 to 4
B、3 to 2
C、2 to 1
D、5 to 1
E、6 to 1

答案:

E
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题目：

The cottontail rabbit population in Orange County, California, has increased unchecked in recent years as a result of the removal of the native fox population and the clearing of surrounding woodlands.

选项:

A、 years as a result of the removal of
B、 years as a result of removing
C、 years, resulting from the removing of
D、 years, which is a result of removing
E、 years, which is a result of the removal of

答案:

A
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581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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1766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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1962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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729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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1663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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1149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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772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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791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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[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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