问答

1答疑

[Problem Solving]

试题详情

题目:

The sides of a square region, measured to the
nearest centimeter, are 6 centimeters long. The
least possible value of the actual area of the
square region is

选项:

A、36.00 sq cm
B、35.00 sq cm
C、33.75 sq cm
D、30.25 sq cm
E、25.00 sq cm

答案:

D
1答疑

[Reading Comprehension]

试题详情

文章:

In the two decades between 1910 and 1930, more than ten percent of the black population of the United States left the South, where the preponderance of the black population had been located, and migrated to northern states, with the largest number moving, it is claimed, between 1916 and 1918. It has been frequently assumed, but not proved, that the majority of the migrants in what has come to be called the Great Migration came from rural areas and were motivated by two concurrent factors: the collapse of the cotton industry following the boll weevil infestation, which began in 1898, and increased demand in the North for labor following the cessation of European immigration caused by the outbreak of the First World War in 1914. This assumption has led to the conclusion that the migrants’ subsequent lack of economic mobility in the North is tied to rural background, a background that implies unfamiliarity with urban living and a lack of industrial skills.

But the question of who actually left the South has never been rigorously investigated. Although numerous investigations document an exodus from rural southern areas to southern cities prior to the Great Migration, no one has considered whether the same migrants then moved on to northern cities. In 1910 more than 600,000 black workers, or ten percent of the black workforce, reported themselves to be engaged in "manufacturing and mechanical pursuits," the federal census category roughly encompassing the entire industrial sector. The Great Migration could easily have been made up entirely of this group and their families. It is perhaps surprising to argue that an employed population could be enticed to move, but an explanation lies in the labor conditions then prevalent in the South.

About thirty-five percent of the urban black population in the South was engaged in skilled trades. Some were from the old artisan class of slavery—blacksmiths, masons, carpenters—which had had a monopoly of certain trades, but they were gradually being pushed out by competition, mechanization, and obsolescence. The remaining sixty-five percent, more recently urbanized, worked in newly developed industries—tobacco, lumber, coal and iron manufacture, and railroads. Wages in the South, however, were low, and black workers were aware, through labor recruiters and the black press, that they could earn more even as unskilled workers in the North than they could as artisans in the South. After the boll weevil infestation, urban black workers faced competition from the continuing influx of both black and white rural workers, who were driven to undercut the wages formerly paid for industrial jobs. Thus, a move north would be seen as advantageous to a group that was already urbanized and steadily employed, and the easy conclusion tying their subsequent economic problems in the North to their rural background comes into question.

题目:

The author indicates explicitly that which of the following records has been a source of information in her investigation?

选项:

A、United States Immigration Service reports from 1914 to 1930Payrolls of southern manufacturing firms between 1910 and 1930
B、The volume of cotton exports between 1898and 1910
C、The federal census of 1910
D、Advertisements of labor recruiters appearing in southern newspapers after 1910

答案:

D
1答疑

[Reading Comprehension]

试题详情

文章:

    In colonial Connecticut between 1670 and 1719, women participated in one of every six civil cases, the vast majority of which were debtrelated. Women's participation dropped to one in ten cases after 1719, and to one in twenty by the 1770's. however, as Cornelia Hughes Dayton notes in Women Before the Bar: Gender, Law, and Society in Connecticut, 1639-1789, these statistics are somewhat deceptive: in fact, both the absolute numbers and the percentage of adult women participating in civil cases grew steadily throughout the eighteenth century, but the legal activity of men also increased dramatically, and at a much faster rate. Single, married, and widowed women continued to pursue their own and their husbands' debtors through legal action much as they had done in the previous century, but despite this continuity, their place in the legal system shifted dramatically. Men's commercial interests and credit networks became increasingly far-flung, owing in part to the ability of creditors to buy and sell promissory notes (legal promises to pay debts). At the same time, women's networks of credit and debt remained primarily local and personal. Dayton contends that, although still performing crucial economic services in their communities—services that contributed to the commercialization of the colonial economy—women remained for the most part outside the new economic and legal culture of the eighteenth century.

题目:

The passage suggests that which of the following best compares the economic concerns of women with those of men toward the close of the eighteenth Century in colonial Connecticut?

选项:

A、Both men and women had more economic responsibilities at the end of the century than they had had at the beginning of the century.
B、Women's economic activities had become less varied by the end of the century;men's economic activities had become more varied.
C、Women's economic activities at the end of the century were similar to their activities at the beginning; men's economic activities changed considerably.
D、Women's economic concerns at the end of the century were primarily familial; men's economic concerns were primarily political.
E、Women's economic concerns at the end of the century were primarily personal; men's economic needs were primarily familial.

答案:

C
1答疑

[Data Sufficiency]

试题详情

题目:

Was the average (arithmetic mean) weight of the package mailed at a certain post office yesterday greater than 600 grams?
(1)   The total weight of the packages mailed at the post office yesterday was greater than 14,500 grams.
(2)   Fewer than 25 packages were mailed at the post office yesterday.

选项:

答案:

E
1答疑

[Problem Solving]

试题详情

题目:

√{2√63 + 2/[8+3√7]} =

选项:

A、8 + 3√7
B、4 + 3√7
C、8
D、4
E、√7

答案:

D
1答疑

[Sentence Correction]

试题详情

题目:

The personal income tax did not become permanent in the United States until the First World War; before that time the federal government was dependent on tariffs to be their main source of revenue.

选项:

A、
A. the federal government was dependent on tariffs to be their main source of revenue
B、
B. the federal government had depended on tariffs as its main source of revenue
C、
C. tariffs were what the federal government was dependent on to be its main source of revenue
D、
D. the main source of revenue for the federal government was dependent on tariffs
E、
E. for their main source of revenue, tariffs were depended on by the federal government

答案:

B
1答疑

[Reading Comprehension]

试题详情

文章:

Line Exactly when in the early modern era Native
Americans began exchanging animal furs with
Europeans for European-made goods is uncertain.
What is fairly certain, even though they left
(5) no written evidence of having done so, is that
the first Europeans to conduct such trade during
the modern period were fishing crews working the
waters around Newfoundland. Archaeologists had
noticed that sixteenth-century Native American
(10) sites were strewn with iron bolts and metal
pins. Only later, upon reading Nicolas Denys’s
1672 account of seventeenth-century European
settlements in North America, did archaeologists
realize that sixteenth-century European fishing
(15) crews had dismantled and exchanged parts of their
ships for furs.
By the time Europeans sailing the Atlantic coast
of North America first documented the fur trade, it
was apparently well underway. The first to record
(20) such trade—the captain of a Portuguese vessel
sailing from Newfoundland in 1501—observed that a
Native American aboard the ship wore Venetian silver
earrings. Another early chronicler noted in 1524 that
Native Americans living along the coast of what is now
(25) New England had become selective about European
trade goods: they accepted only knives, fishhooks,
and sharp metal. By the time Cartier sailed the Saint
Lawrence River ten years later, Native Americans had
traded with Europeans for more than thirty years,
(30) perhaps half a century.

题目:

Which of the following, if true, most strengthens the author’s assertion in the first sentence of the second paragraph?

选项:

A、
When Europeans retraced Cartier's voyage in the first years of the seventeenth century, they frequently traded with Native Americans.
B、
Furs from beavers, which were plentiful in North America but nearly extinct in Europe, became extremely fashionable in Europe in the final decades of the sixteenth century.
C、
Firing arms were rarely found on sixteenth-century Native American sites or on European lists of trading goods since such arms required frequent maintenance and repair.
D、
Europeans and Native Americans had established trade protocols, such as body language assuring one another of their peaceful intentions, that antedate the earliest records of trade.
E、
During the first quarter of the sixteenth century, an Italian explorer recorded seeing many Native Americans with what appeared to be copper beads, though they may have been made of indigenous copper.

答案:

D
1答疑

[Problem Solving]

试题详情

题目:

In the figure shown, the triangle is inscribed in the semicircle. If the length of line segment AB is 8 and the length of line segment BC is 6, what is the length of arc ABC?

选项:

A、15π
B、12π
C、10π
D、7π
E、5π

答案:

E
1答疑

[Problem Solving]

试题详情

题目:

Seed mixture X is 40 percent ryegrass and 60 percent bluegrass by weight; seed mixture Y is 25 percent ryegrass and 75 percent fescue. If a mixture of X and Y contains 30 percent ryegrass, what percent of the weight of the mixture is X ?

选项:

A、10%
B、
C、40%
D、50%
E、

答案:

B
1答疑

[Sentence Correction]

试题详情

题目:

Of all the record companies involved in early jazz, the three most prominent were Columbia, Victor, and OKeh.

选项:

A、
A. Of all the record companies involved in early jazz, the three most prominent were Columbia, Victor, and OKeh.
B、
B. Three most prominent record companies of all the ones that were involved in early jazz were Columbia, Victor, and OKeh.
C、
C. Columbia, Victor, and OKeh were, of all the record companies involved in early jazz, the three of them that were most prominent.
D、
D. Columbia, Victor, and OKeh were three most prominent of all the record companies involved in early jazz.
E、
E. Out of all the record companies that were involved in early jazz, three of them that were the most prominent were Columbia, Victor, and OKeh.

答案:

A
0评分
1142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
3256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
3609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
1196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
2749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
1890浏览

[OG]

The primary purpose of the passage is to
为什么选E不选B
0评分
1212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
1272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
302507浏览

[Undefined]

Analytical!
请问may老师,这题该用什么思路来做?
0评分
309634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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