问答

2答疑

[Critical Reasoning]

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题目：

Capuchin monkeys often rub their bodies with a certain type of millipede.  Laboratory tests show that secretions from the bodies of these millipedes are rich in two chemicals that are potent mosquito repellents, and mosquitoes carry parasites that debilitate capuchins.  Some scientists hypothesize that the monkeys rub their bodies with the millipedes because doing so helps protect them from mosquitoes.
 
Which of the following, if true, provides the most support for the scientists' hypothesis?

选项:

A、A single millipede often gets passed around among several capuchins, all of whom rub their bodies with it.
B、The two chemicals that repel mosquitoes also repel several other varieties of insects.
C、The capuchins rarely rub their bodies with the millipedes except during the rainy season, when mosquito populations are at their peak.
D、Although the capuchins eat several species of insects, they do not eat the type of millipede they use to rub their bodies.
E、The two insect-repelling chemicals in the secretions of the millipedes are carcinogenic for humans but do not appear to be carcinogenic for capuchins.

答案:

C
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[Problem Solving]

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题目：

2x + y = 12
│y│≤ 12
For how many ordered pairs (x, y) that 2 solutions of the system above are x and y both integers?

选项:

A、7
B、10
C、12
D、13
E、14

答案:

D
2答疑

[Data Sufficiency]

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题目：

If x is negative, is x ＜ -3?
(1)   x2 ＞ 9
(2) x3 ＜ -9
b

选项:

答案:

A
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[Problem Solving]

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题目：

The membership of a committee consists of 3 English teachers, 4 Mathematics teachers, and 2 Social Studies teachers.  If 2 committee members are to be selected at random to write the committee's report, what is the probability that the two members selected will both be English teachers?

选项:

A、   2/3
B、   1/3
C、   2/9
D、   1/12
E、   1/24

答案:

D
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[Problem Solving]

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题目：

What is the volume of a given cube?

(1) The ratio of an edge of the cube and the greatest distance between two points on the cube is

(2) The length of the diagonal across a face of the cube is 2.

选项:

A、Aif statement (1) ALONE is sufficient to answer the question but statement (2) alone is not sufficient;
B、Bif statement (2) ALONE is sufficient to answer the question but statement (1) alone is not sufficient;
C、Cif the two statements TAKEN TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient;
D、Dif EACH statement ALONE is sufficient to answer the question;
E、Eif the two statements TAKEN TOGETHER are still NOT sufficient to answer the question.     

答案:

B
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[Sentence Correction]

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题目：

In contrast to environmentalists proposals to limit emissions of certain
pollutants, the administration proposed calling for mandatory restrictions of
only three such pollutants from power plants-mercury, sulfur dioxide, and
nitrogen oxides-and the plan would delay such cuts until 2010 or later.

选项:

A、administration proposed calling for mandatory restriction of
B、administration proposed a call for mandatory restrictions, including those for
C、administration, proposing mandatory restrictions on
D、administration's proposal was a call for mandatory restrictions, which include
E、administration's proposal would call for mandatory restrictions on

答案:

E
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[Critical Reasoning]

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题目：

Delta Products Inc. has recently switched at least partly from older technologies using fossil fuels to new technologies powered by electricity. The question has been raised whether it can be concluded that for a given level of output Delta’s operation now causes less fossil fuel to be consumed than it did formerly. The answer, clearly, is yes, since the amount of fossil fuel used to generate the electricity needed to power the new technologies is less than the amount needed to power the older technologies, provided level of output is held constant.

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

选项:

A、The first identifies the content of the conclusion of the argument; the second provides support for that conclusion.
B、The first provides support for the conclusion of the argument; the second identifies the content of that conclusion.
C、The first states the conclusion of the argument; the second calls that conclusion into question.
D、The first provides support for the conclusion of the argument; the second calls that conclusion into question.
E、Each provides support for the conclusion of the argument.

答案:

B
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[Reading Comprehension]

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文章：

题目：

The author of the passage would be most likely to make which of the following recommendations to scholars of women's history?

选项:

A、They should take into account their own life experiences when interpreting the oral accounts of women's historical experiences.
B、They should assume that the observations made in women's oral narratives are believed by the intended audience of the story.
C、They should treat skeptically observations reported in oral narratives unless the observations can be confirmed in standard histories.
D、They should consider the cultural and historical context in which an oral narrative was created before arriving at an interpretation of such a narrative.
E、They should rely on information gathered from oral narratives only when equivalent information is not available in standard histories.

答案:

D
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[Reading Comprehension]

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文章：

    Acting on the recommendation of a British government committee investigating the high incidence in white lead factories of illness among employees, most of whom were women, the Home Secretary proposed in 1895 that Parliament enact legislation that would prohibit women from holding most jobs in white lead factories. Although the Women's Industrial Defence Committee (WIDC), formed in 1892 in response to earlier legislative attempts to restrict women's labor, did not discount the white lead trade's potential health dangers, it opposed the proposal, viewing it as yet another instance of limiting women's work opportunities. Also opposing the proposal was the Society for Promoting the Employment of Women (SPEW), which attempted to challenge it by investigating the causes of illness in white lead factories. SPEW contended, and WIDC concurred, that controllable conditions in such factories were responsible for the development of lead poisoning. SPEW provided convincing evidence that lead poisoning could be avoided if workers were careful and clean and if already extant workplace safety regulations were stringently enforced.

    However, the Women's Trade Union League (WTUL), which had ceased in the late 1880's to oppose restrictions on women's labor, supported the eventually enacted proposal, in part because safety regulations were generally not being enforced in white lead factories, where there were no unions (and little prospect of any) to pressure employers to comply with safety regulations.

题目：

The passage suggests that WIDC differed from WTUL in which of the following ways?
             

选项:

A、WIDC believed that the existing safety regulations were adequate to protect women's health, whereas WTUL believed that such regulations needed to be strengthened.
B、WIDC believed that unions could not succeed in pressuring employers to comply with such regulations, whereas WTUL believed that unions could succeed in doing so.
C、WIDC believed that lead poisoning in white lead factories could be avoided by controlling conditions there, whereas WTUL believed that lead poisoning in such factories could not be avoided no matter how stringently safety regulations were enforced.
D、At the time that the legislation concerning white lead factories was proposed, WIDC was primarily concerned with addressing health conditions in white lead factories, whereas WTUL was concerned with improving working conditions in all types of factories.
E、At the time that WIDC was opposing legislative attempts to restrict women's labor, WTUL had already ceased to do so.

答案:

E
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[Problem Solving]

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题目：

As shown in the figure above, a thin conveyor belt 15 feet long is drawn tightly around two circular wheels each 1 foot in diameter. What is the distance, in feet, between the centers of the two wheels?

选项:

A、(15-π)/2 
B、5π/4
C、15-2π
D、15-π
E、2π

答案:

A
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1919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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4984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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5684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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1901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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4118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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2878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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1905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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1994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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425484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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432621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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