问答

2答疑

[Problem Solving]

试题详情

题目:

Define the symbol * by the following equation: x* = 1 – x, for all non-negative x. If ((1 − x)*)* = (1 − x)*, then x

选项:

A、1/2
B、3/4
C、1
D、2
E、3

答案:

A
2答疑

[Problem Solving]

试题详情

题目:

The toll for crossing a certain bridge is $0.75 each crossing. Drivers who frequently use the bridge may instead purchase a sticker each month for $13.00 and then pay only $0.30 each crossing during that month.  If a particular driver will cross the bridge twice on each of x days next month and will not cross the bridge on any other day, what is the least value of x for which this driver can save money by using the sticker?

选项:

A、14
B、15
C、16
D、28
E、29

答案:

B
2答疑

[Reading Comprehension]

试题详情

文章:

Ethnohistoric documents from sixteenth-century Mexico suggesting that weaving and cooking were the most common productive activities for Aztec women may lead modern historians to underestimate the value of women's contributions to Aztec society.  Since weaving and cooking occurred mostly (but not entirely) in a domestic setting, modern historians are likely to apply to the Aztec culture the modern Western distinction between "private" and "public" production.  Thus, the ethnohistoric record conspires with Western culture to foster the view that women's production was not central to the demographic, economic, and political structures in sixteenth-century Mexico.
 
A closer examination of Aztec culture indicates that treating Aztec women's production in Mexico in such a manner would be a mistake.  Even if the products of women's labor did not circulate beyond the household, such products were essential to population growth.  Researchers document a tenfold increase in the population of the valley of Mexico during the previous four centuries, an increase that was crucial to the developing Aztec political economy.  Population growth--which could not have occurred in the absence of successful household economy, in which women's work was essential--made possible the large-scale development of labor-intensive chinampa (ridged-field) agriculture in the southern valley of Mexico which, in turn, supported urbanization and political centralization in the Aztec capital.
 
But the products of women's labor did in fact circulate beyond the household.  Aztec women wove cloth, and cloth circulated through the market system, the tribute system, and the redistributive economy of the palaces.  Cotton mantles served as a unit of currency in the regional market system.  Quantities of woven mantles, loincloths, blouses, and skirts were paid as tribute to local lords and to imperial tax stewards and were distributed to ritual and administrative personnel, craft specialists, warriors, and other faithful servants of the state.  In addition, woven articles of clothing served as markers of social status and clothing fulfilled a symbolic function in political negotiation.  The cloth that was the product of women's work thus was crucial as a primary means of organizing the flow of goods and services that sustained the Aztec state.

题目:

The passage is primarily concerned with

选项:

A、using modern understanding of cultural bias to challenge ethnohistoric documents
B、evaluating competing descriptions of women's roles in Aztec society
C、comparing the influence of gender on women's roles in Aztec society and in modern society
D、remedying a potential misconception about the significance of women's roles in Aztec society
E、applying new evidence in a reevaluation of ethnohistoric documents

答案:

D
2答疑

[Problem Solving]

试题详情

题目:

If x, y, and k

选项:

A、10
B、12
C、15
D、18
E、30

答案:

D
2答疑

[Reading Comprehension]

试题详情

文章:

    In a 1918 editorial, W.E.B. Du Bois advised African Americans to stop agitating for equality and to proclaim their solidarity with White Americans for the duration of the First World War. The editorial surprised many African Americans who viewed Du Bois as an uncompromising African American leader and a chief opponent of the accommodationist tactics urged by Booker, T.Washington. In fact, however, Du Bois often shifted positions along the continuum between Washington and confrontationists such as William Trotter. In 1895, when Washington called on African Americans to concentrate on improving their communities instead of opposing discrimination and agitating for political rights, Du Bois praised Washington's speech. In 1903, however, Du Bois aligned himself with Trotter, Washington's militant opponent, less for ideological reasons than because Trotter had described to him Washington's efforts to silence those in the African American press who opposed Washington's positions.reflected not a change in his long-term goals but rather a pragmatic response in the face of social pressure: government officials had threatened African American journalists with censorship if they continued to voice grievances. Furthermore, Du Bois believed that African Americans' contributions to past war efforts had brought them some legal and political advances. Du Bois' accommodationism did not last, however. Upon learning of systematic discrimination experienced by African Americans in the military, he called on them to "return fighting" from the war.

题目:

The passage indicates which of the following about Du Bois' attitude toward Washington?

选项:

A、It underwent a shift during the First World War as Du Bois became more sympa-thetic with Trotter's views.
B、It underwent a shift in 1903 for reasons Other than Du Bois' disagreement with Washington's accommodationist views.
C、It underwent a shift as Du Bois made a long-term commitment to the strategy of accommodation.
D、It remained consistently positive even Though Du Bois disagreed with Washington's efforts to control the African American press.
E、It was shaped primarily by Du Bois'appreciation of Washington's pragmatic approach to the advancement of the interests of African Americans.

答案:

B
2答疑

[Critical Reasoning]

试题详情

题目:

Which of the following most logically completes the argument?
 
The irradiation of food kills bacteria and thus retards spoilage.  However, it also lowers the nutritional value of many foods.  For example, irradiation destroys a significant percentage of whatever vitamin B1 a food may contain.  Proponents of irradiation point out that irradiation is no worse in this respect than cooking.  However, this fact is either beside the point, since much irradiated food is eaten raw, or else misleading, since _______.

选项:

A、many of the proponents of irradiation are food distributors who gain from food's having a longer shelf life
B、it is clear that killing bacteria that may be present on food is not the only effect that irradiation has
C、cooking is usually the final step in preparing food for consumption, whereas irradiation serves to ensure a longer shelf life for perishable foods
D、certain kinds of cooking are, in fact, even more destructive of vitamin B1 than carefully controlled irradiation is
E、for food that is both irradiated and cooked, the reduction of vitamin B1 associated with either process individually is compounded

答案:

E
2答疑

[Sentence Correction]

试题详情

题目:

Nobody knows exactly how many languages there are in the world,
partly because of the difficulty of distinguishing between a language
and the sub-languages or dialects within it, but those who have tried
 to count typically have found about five thousand.

选项:

A、and the sub-languages or dialects within it, but those who have tried to count typically have found
B、and the sub-languages or dialects within them, with those who have tried counting typically finding
C、and the sub-languages or dialects within it, but those who have tried counting it typically find
D、or the sub-languages or dialects within them, but those who tried to count them typically found
E、or the sub-languages or dialects within them, with those who have tried to count typically finding

答案:

A
2答疑

[Reading Comprehension]

试题详情

文章:

    Is it possible to decrease inflation without causing a recession and its concomitant increase in unemployment? The orthodox answer is "no." whether they support the "inertia" theory of inflation (that today's inflation rate is caused by yesterday's infla tion, the state of the economic cycle, and external influences such as import prices) or the "rational expectations" theory (that inflation is caused by workers' and employers' expectations, coupled with a lack of credible monetary and fiscal policies), most economists agree that tight monetary and fiscal policies, which cause recessions, are necessary to decelerate inflation. They point out that in the 1980's, many European countries and the United States conquered high (by these countries' standards) inflation, but only by applying tight monetary and fiscal policies that sharply increased unemployment. Nevertheless, some governments' policymakers insist that direct controls on wages and prices, without tight monetary and fiscal policies, can succeed in decreasing inflation. Unfortunately, because this approach fails to deal with the underlying causes of inflation, wage and price controls eventually collapse, the hitherto-repressed inflation resurfaces, and in the meantime, though the policymakers succeed in avoiding a recession, a frozen structure of relative prices imposes distortions that do damage to the economy's prospects for longterm growth.

题目:

The passage suggests that the high inflation in the United States and many European countries in the 1980's differed from inflation elsewhere in which of the following ways?

选项:

A、It fit the rational expectations theory of inflation but not the inertia theory of inflation.
B、It was possible to control without causing a recession.
C、It was easier to control in those countries by applying tight monetary and fiscal policiesthan it would have been elsewhere.
D、It was not caused by workers' and employers'expectations.
E、It would not necessarily be considered high elsewhere.

答案:

E
2答疑

[Problem Solving]

试题详情

题目:

If x and y are different prime numbers, each greater than 2, which of the following must betrue?

II x - y is an even integer.
III is not an integer.

选项:

A、II onlyI and II only
B、I and III only
C、II and III only
D、I,IIandIII

答案:

E
2答疑

[Data Sufficiency]

试题详情

题目:

A total of 100 customers purchased books at a certain bookstore last week. If these customers purchased a total of 200 books, how many of the customers purchased only 1 book each?
(1)   None of the customers purchased more than 3 books.
(2)   20 of the customers purchased only 2 books each.

选项:

答案:

C
0评分
390浏览

[Undefined]

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?
0评分
1399浏览

[Undefined]

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
0评分
1565浏览

[Undefined]

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
0评分
599浏览

[Undefined]

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?
0评分
1391浏览

[GWD]

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
0评分
981浏览

[OG]

The primary purpose of the passage is to
为什么选E不选B
0评分
653浏览

[Undefined]

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
0评分
670浏览

[Undefined]

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
0评分
157592浏览

[Undefined]

Analytical!
请问may老师,这题该用什么思路来做?
0评分
164701浏览

[Undefined]

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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