[Problem Solving]
试题详情
题目：
The points R, T, and U lie on a circle that has radius 4. If the length of arc RTU is 4π/3, what is the length of line segment RU?
bu选项:
A、4/3
B、8/3
C、3
D、4
E、6
答案:
D
问答
1答疑
1答疑
[Reading Comprehension]
试题详情
文章：
Recently biologists have been interested in a tide-associated periodic behavior displayed by the diatom Hantzschia virgata, a microscopic golden-brown alga that inhabits that portion of a shoreline washed by tides (the intertidal zone).Diatoms of this species, sometimes called "commuter" diatoms, remain burrowed in the sand during high tide, and emerge on the sand surface during the daytime low tide. Just before the sand is inundated by the rising tide, the diatoms burrow again. Some scientists hypothesize that commuter diatoms know that it is low tide because they sense an environmental change, such as an alteration in temperature or a change in pressure caused by tidal movement. However, when diatoms are observed under constant conditions in a laboratory, they still display periodic behavior, continuing to burrow on schedule for several weeks. This indicates that commuter diatoms, rather than relying on environmental cues to keep time, possess an internal pacemaker or biological clock that enables them to anticipate periodic changes in the environment. A commuter diatom has an unusually accurate biological clock, a consequence of the unrelenting environmental pressures to which it is subjected; any diatoms that do not burrow before the tide arrives are washed away.
This is not to suggest that the period of this biological clock is immutably fixed. Biologists have concluded that even though a diatom does not rely on the environment to keep time, environmental factors—including changes in the tide's hydrostatic pressure, salinity, mechanical agitation, and temperature—can alter the period of its biological clock according to changes in the tidal cycle. In short, the relation between an organism's biological clock and its environment is similar to that between a wristwatch and its owner: the owner cannot make the watch run faster or slower, but can reset the hands. However, this relation is complicated in intertidal dwellers such as commuter diatoms by the fact that these organisms areexposed to the solar-day cycle as well as to the tidal cycle, and sometimes display both solar-day and tidal periods in a single behavior. Commuter diatoms, for example, emerge only during those low tides that occur during the day.
This is not to suggest that the period of this biological clock is immutably fixed. Biologists have concluded that even though a diatom does not rely on the environment to keep time, environmental factors—including changes in the tide's hydrostatic pressure, salinity, mechanical agitation, and temperature—can alter the period of its biological clock according to changes in the tidal cycle. In short, the relation between an organism's biological clock and its environment is similar to that between a wristwatch and its owner: the owner cannot make the watch run faster or slower, but can reset the hands. However, this relation is complicated in intertidal dwellers such as commuter diatoms by the fact that these organisms areexposed to the solar-day cycle as well as to the tidal cycle, and sometimes display both solar-day and tidal periods in a single behavior. Commuter diatoms, for example, emerge only during those low tides that occur during the day.
题目：
The author of the passage compares the relationship between an organism's biological clock and its environment to the relation between a wristwatch and its owner most probably in order to
选项:
A、point out a fundamental difference between the function of biological clocks in organisms and the use of mechanical clocks by humans
B、illustrate the way in which the period of an organism's biological clock can be altered by environmental factors
C、suggest that there are important similarities between the biological clock in organisms such as the commuter diatom and the biological clock in humans
D、support an argument regarding the methods used by certain organisms to counteract the influence of the environment on their biological clocks
E、question the accuracy of the biological clock in organisms such as the commuter diatom
答案:
B
1答疑
[Sentence Correction]
试题详情
题目：
According to a recent poll, owning and living in a freestanding house on its own land is still a goal of a majority of young adults, like that of earlier generations.
选项:
A、like that of earlier generations
B、as that for earlier generations
C、just as earlier generations did
D、as have earlier generations
E、as it was of earlier generations
答案:
E
1答疑
[Problem Solving]
试题详情
题目：
In a survey, 2,500 executives were each asked whether they read Newsletter A or Newsletter B. According to the survey, 55 percent of the executives read Newsletter A, 62 percent read Newsletter B, and 37 percent read both Newsletter A and Newsletter B. How many of the executives surveyed read neither Newsletter A nor Newsletter B?
选项:
A、425
B、500
C、600
D、675
E、750
答案:
B
1答疑
[Sentence Correction]
试题详情
题目：
Published in Harlem, the owner and editor of The Messenger were two young journalists, Chandler Owen and A. Philip Randolph, who would later make his reputation as a labor leader.
选项:
A、Published in Harlem, the owner and editor of The Messenger were two young journalists, Chandler Owen and A. Philip Randolph, who would later make his reputation as a labor leaderPublished in Harlem, two young journalists, Chandler Owen and A. Philip Randolph, who would later make his reputation as a labor leader, were the owner and editor of The Messenger.
B、Published in Harlem, The Messenger was owned and edited by two young journalists, A. Philip Randolph, who would later make his reputation as a labor leader, and Chandler Owen.
C、The Messenger was owned and edited by two young journalists, Chandler Owen and A. Philip Randolph, who would later make his reputation as a labor leader, and published in Harlem.
D、The owner and editor being two young journalists, Chandler Owen and A. Philip Randolph, who would later make his reputation as a labor leader, The Messenger was published in Harlem.
答案:
C
1答疑
[Critical Reasoning]
试题详情
题目：
The significance of Monet’s work is reflected in a recent discussion of art more than it was in his own descriptions. He is, usually, considered a founding member of French impressionists. Thus, his descriptions are unlikely to do more than confirm what he thought to be true.
Which one of the following most accurately describes a questionable technique used in the argument?
Which one of the following most accurately describes a questionable technique used in the argument?
选项:
A、A. It cites two pieces of evidence, each of which is both questionable and unverifiable, and uses this evidence to support its conclusions.
B、B. It uses the descriptions from a famous artist to support its conclusions.
C、C. It attempts to establish the validity of a claim, which is otherwise unsupported, by denying the truth of the opposite of that claim.
D、D. It bases a conclusion on two premises that contradict each other and minimize this contradiction by the vagueness of the terms employed.
E、E. It draws conclusions about the merit of a position from evidence about the position's source.
答案:
E
1答疑
[Critical Reasoning]
试题详情
题目：
Ten years ago, the total share of federal, state, and local taxes was 23 percent of the nation’s Gross National Product. Now, that share has decreased to 21 percent.
Which one of the following can be properly inferred from the facts given above?
Which one of the following can be properly inferred from the facts given above?
选项:
A、A. The total amount of federal, state, and local taxes paid now is less than the amount paid ten years ago.
B、B. On average, people now have a better standard of living than they did ten years ago.
C、C. The average taxpayer keeps a greater percentage of income for his own use than he did ten years ago.
D、D. Federal, state, and local governments have reduced the level of services they offer to constituents.
E、E. Inefficiency and fraud have been reduced in government services.
答案:
C
1答疑
[Critical Reasoning]
试题详情
题目：
Which of the following most logically completes the argument below?
Davison River farmers are currently deciding between planting winter wheat this fall or spring wheat next spring. Winter wheat and spring wheat are usually about equally profitable. Because of new government restrictions on the use of Davison River water for irrigation, per acre yields for winter wheat, though not for spring wheat, would be much lower than average. Therefore, planting spring wheat will be more profitable than planting winter wheat, since ________.
Davison River farmers are currently deciding between planting winter wheat this fall or spring wheat next spring. Winter wheat and spring wheat are usually about equally profitable. Because of new government restrictions on the use of Davison River water for irrigation, per acre yields for winter wheat, though not for spring wheat, would be much lower than average. Therefore, planting spring wheat will be more profitable than planting winter wheat, since ________.
选项:
A、the smaller-than-average size of a winter wheat harvest this year would not be compensated for by higher winter wheat prices
B、new crops of spring wheat must be planted earlier than the time at which standing crops of winter wheat are ready to be harvested
C、the spring wheat that farmers in the Davison River region plant is well adapted to the soil of the region
D、spring wheat has uses that are different from those of winter wheat
E、planting spring wheat is more profitable than planting certain other crops, such as rye
答案:
A
1答疑
[Reading Comprehension]
试题详情
文章：
| Line | Historians remain divided over the role of |
| banks in facilitating economic growth in the | |
| United States in the late eighteenth and early | |
| nineteenth centuries. Some scholars contend | |
| (5) | that banks played a minor role in the nation’s |
| growing economy. Financial institutions, they | |
| argue, appeared only after the economy had | |
| begun to develop, and once organized, followed | |
| conservative lending practices, providing aid to | |
| (10) | established commercial enterprises but |
| shunning those, such as manufacturing and | |
| transportation projects, that were more | |
| uncertain and capital-intensive (i.e., requiring | |
| greater expenditures in the form of capital than in | |
| (15) | labor). |
| A growing number of historians argue, in | |
| contrast, that banks were crucial in transforming | |
| the early national economy. When state | |
| legislatures began granting more bank charters | |
| (20) | in the 1790s and early 1800s, the supply of |
| credit rose accordingly. Unlike the earliest banks, | |
| which had primarily provided short-term loans to | |
| well-connected merchants, the banks of the early | |
| nineteenth century issued credit widely. As Paul | |
| (25) | Gilje asserts, the expansion and democratization |
| of credit in the early nineteenth century became | |
| the driving force of the American economy, as | |
| banks began furnishing large amounts of capital | |
| to transportation and industrial enterprises. The | |
| (30) | exception, such historians argue, was in the |
| South; here, the overwhelmingly agrarian nature | |
| of the economy generated outright opposition | |
| to banks, which were seen as monopolistic | |
| institutions controlled by an elite group of | |
| (35) | planters. |
题目：
The passage suggests that the scholars mentioned in line 4 would argue that the reason banks tended not to fund manufacturing and transportation projects in the late eighteenth and early nineteenth centuries was that
选项:
A、these projects, being well established and well capitalized, did not need substantial long-term financing from banks
B、these projects entailed a level of risk that was too great for banks’ conservative lending practices
C、banks preferred to invest in other, more speculative projects that offered the potential for higher returns
D、bank managers believed that these projects would be unlikely to contribute significantly to economic growth in the new country
E、bank managers believed funding these projects would result in credit being extended to too many borrowers
答案:
B
1答疑
[Critical Reasoning]
试题详情
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, studies show that of scientists who produce highly creative work beyond the age of forty, a disproportionately large number entered their field at an older age than is usual. Since by the age of forty the large majority of scientists have been working in their field for at least fifteen years, the studies’ finding strongly suggests that the real reason why scientists over forty rarely produce highly creative work is not that they have aged but rather that scientists over forty have generally spent too long in their field.
In the argument given, the two portions in boldface play which of the following roles?
In the argument given, the two portions in boldface play which of the following roles?
选项:
A、The first is a claim, the accuracy of which is at issue in the argument; the second is a conclusion drawn on the basis of that claim.
B、The first is an objection that has been raised against a position defended in the argument; the second is that position.
C、The first is evidence that has been used to support an explanation that the argument challenges; the second is that explanation.
D、The first is evidence that has been used to support an explanation that the argument challenges; the second is a competing explanation that the argument favors.
E、The first provides evidence to support an explanation that the argument favors; the second is that explanation.
答案:
E
0评分
1933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.
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
5023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
5707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
1912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
4131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
2898浏览
0评分
1915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
2003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
427215浏览
0评分
434353浏览
