问答

2答疑

[Problem Solving]

试题详情

题目:

A certain right triangle has sides of length x , y , and z, where. If the area of this triangular region is 1, which of the following indicates all of the possible values of y   ?

选项:

A、
B、
C、
D、
E、

答案:

A
2答疑

[Problem Solving]

试题详情

题目:

Yesterday each of the 35 members of a certain task force spent some time working on project P .  The graph shows the number of hours and the number of members who spent that number of hours working on project P  yesterday.  What was the median number of hours that the members of the task force spent working on project P  yesterday?

选项:

A、2
B、3
C、4
D、5
E、6

答案:

E
2答疑

[Critical Reasoning]

试题详情

题目:

Economist:  Tropicorp, which constantly seeks profitable investment opportunities, has been buying and clearing sections of tropical forest for cattle ranching, although pastures newly created there become useless for grazing after just a few years.  The company has not gone into rubber tapping, even though greater profits can be made from rubber tapping, which leaves the forest intact.  Thus, some environmentalists conclude that Tropicorp has not acted wholly out of economic self-interest.  However, these environmentalists are probably wrong.  The initial investment required for a successful rubber-tapping operation is larger than that needed for a cattle ranch.  Furthermore, there is a shortage of workers employable in rubber-tapping operations, and finally, taxes are higher on profits from rubber tapping than on profits from cattle ranching.
 
In the economist's argument, the two boldfaced portions play which of the following roles?

选项:

A、The first supports the conclusion of the economist's argument; the second calls that conclusion into question.
B、The first states the conclusion of the economist's argument; the second supports that conclusion.
C、The first supports the environmentalists' conclusion; the second states that conclusion.
D、The first states the environmentalists' conclusion; the second states the conclusion of the economist's argument.
E、Each supports the conclusion of the economist's argument.

答案:

C
2答疑

[Reading Comprehension]

试题详情

文章:

题目:

Which of the following statements about Clark's study of the telephone exchange can be inferred from information in the passage?

选项:

A、Clark's reason for undertaking the study was to undermine Braverman's analysis of the function of technology.
B、Clark's study suggests that the implementation of technology should be discussed in the context of conflict between labor and management.
C、Clark examined the impact of changes in the technology of switching at the exchange in terms of overall operations and organization.
D、Clark concluded that the implementation of new switching technology was equally beneficial to management and labor.
E、Clark's analysis of the change in switching systems applies only narrowly to the situation at the particular exchange that he studied.

答案:

C
2答疑

[Sentence Correction]

试题详情

题目:

The eyes of the elephant seal adapt to darkness more quickly than any other animal yet tested, thus allowing it to hunt efficiently under the gloomy conditions at its feeding depth of between 300 and 700 meters.

选项:

A、The eyes of the elephant seal adapt to darkness more quickly than any other animal yet tested, thus allowing it
B、The eyes of the elephant seal adapt to darkness more quickly than does any other animal yet tested, allowing them
C、The eyes of the elephant seal adapt to darkness more quickly than do those of any other animal yet tested, allowing it
D、Because they adapt to darkness more quickly than any other animal yet tested, the eyes of the elephant seal allow it
E、Because the eyes of the elephant seal adapt to darkness more quickly than do those of any other animal yet tested, it allows them

答案:

C
2答疑

[Reading Comprehension]

试题详情

文章:

Milankovitch proposed in the early twentieth century that the ice ages were caused by variations in the Earth’s orbit around the Sun. For some time this theory was considered untestable, largely because there was no sufficiently precise chronology of the ice ages with which the orbital variations could be matched.

To establish such a chronology it is necessary to determine the relative amounts of land ice that existed at various times in the Earth’s past. A recent discovery makes such a determination possible: relative land-ice volume for a given period can be deduced from the ratio of two oxygen isotopes, 16 and 18, found in ocean sediments. Almost all the oxygen in water is oxygen 16, but a few molecules out of every thousand incorporate the heavier isotope 18. When an ice age begins, the continental ice sheets grow, steadily reducing the amount of water evaporated from the ocean that will eventually return to it. Because heavier isotopes tend to be left behind when water evaporates from the ocean surfaces, the remaining ocean water becomes progressively enriched in oxygen 18. The degree of enrichment can be determined by analyzing ocean sediments of the period, because these sediments are composed of calcium carbonate shells of marine organisms, shells that were constructed with oxygen atoms drawn from the surrounding ocean. The higher the ratio of oxygen 18 to oxygen 16 in a sedimentary specimen, the more land ice there was when the sediment was laid down.

As an indicator of shifts in the Earth’s climate, the isotope record has two advantages. First, it is a global record: there is remarkably little variation in isotope ratios in sedimentary specimens taken from different continental locations. Second, it is a more continuous record than that taken from rocks on land. Because of these advantages, sedimentary evidence can be dated with sufficient accuracy by radiometric methods to establish a precise chronology of the ice ages. The dated isotope record shows that the fluctuations in global ice volume over the past several hundred thousand years have a pattern: an ice age occurs roughly once every 100,000 years. These data have established a strong connection between variations in the Earth’s orbit and the periodicity of the ice ages.

However, it is important to note that other factors, such as volcanic particulates or variations in the amount of sunlight received by the Earth, could potentially have affected the climate. The advantage of the Milankovitch theory is that it is testable; changes in the Earth’s orbit can be calculated and dated by applying Newton’s laws of gravity to progressively earlier configurations of the bodies in the solar system. Yet the lack of information about other possible factors affecting global climate does not make them unimportant.

题目:

It can be inferred from the passage that precipitation formed from evaporated ocean water has

选项:

A、the same isotopic ratio as ocean waterless oxygen 18 than does ocean water
B、less oxygen 18 than has the ice contained in continental ice sheets
C、a different isotopic composition than has precipitation formed from water on land
D、more oxygen 16 than has precipitation formed from fresh water

答案:

B
2答疑

[Reading Comprehension]

试题详情

文章:

In Winters v. United States (1908), the Supreme Court held that the right to use waters flowing through or adjacent to the Fort Belknap Indian Reservation was reserved to American Indians by the treaty establishing the reservation. Although this treaty did not mention water rights, the Court ruled that the federal government, when it created the reservation, intended to deal fairly with American Indians by reserving for them the waters without which their lands would have been useless. Later decisions, citing Winters, established that courts can find federal rights to reserve water for particular purposes if (1) the land in question lies within an enclave under exclusive federal jurisdiction, (2) the land has been formally withdrawn from federal public lands—i.e., withdrawn from the stock of federal lands available for private use under federal land use laws—and set aside or reserved, and (3) the circumstances reveal the government intended to reserve water as well as land when establishing the reservation.

Some American Indian tribes have also established water rights through the courts based on their traditional diversion and use of certain waters prior to the United States’ acquisition of sovereignty. For example, the Rio Grande pueblos already existed when the United States acquired sovereignty over New Mexico in 1848. Although they at that time became part of the United States, the pueblo lands never formally constituted a part of federal public lands; in any event, no treaty, statute, or executive order has ever designated or withdrawn the pueblos from public lands as American Indian reservations. This fact, however, has not barred application of the Winters doctrine. What constitutes an American Indian reservation is a question of practice, not of legal definition, and the pueblos have always been treated as reservations by the United States. This pragmatic approach is buttressed by Arizona v. California (1963), wherein the Supreme Court indicated that the manner in which any type of federal reservation is created does not affect the application to it of the Winters doctrine. Therefore, the reserved water rights of Pueblo Indians have priority over other citizens’ water rights as of 1848, the year in which pueblos must be considered to have become reservations.

题目:

Which of the following most accurately summarizes the relationship between Arizona v. California in highlight text, and the criteria citing the Winters doctrine in the last sentence of first paragraph?

选项:

A、Arizona v. California abolishes these criteria and establishes a competing set of criteria for applying the Winters doctrine.Arizona v. California establishes that the Winters doctrine applies to a broader range of situations than those defined by these criteria.
B、Arizona v. California represents the sole example of an exception to the criteria as they were set forth in the Winters doctrine.
C、Arizona v. California does not refer to the Winters doctrine to justify water rights, whereas these criteria do rely on the Winters doctrine.
D、Arizona v. California applies the criteria derived from the Winters doctrine only to federal lands other than American Indian reservations.

答案:

B
2答疑

[Critical Reasoning]

试题详情

题目:

Economist: The price of tap water in our region should be raised drastically. Supplies in local freshwater reservoirs have been declining for years because water is being used faster than it can be replenished. Since the price of tap water has been low, few users have bothered to adopt even easy conservation measures.

The two sections in boldface play which of the following roles in the economist’s argument?

选项:

答案:

C
2答疑

[Critical Reasoning]

试题详情

文章:

Bank depositors in the United States are all financially protected against bank failure because the government insures all individuals' bank deposits.An economist argues that this insurance is partly responsible for the high rate of bank failures, since it removes from depositors any financial incentive to find out whether the bank that holds their money is secure against failure.If depositors were more selective.then banks would need to be secure in order to compete for depositors' money.

题目:

The economist's argument makes which of the following assumptions?

选项:

A、Bank failures are caused when big borrowers default on loan repayments. A significant proportion of depositors maintain accounts at several different banks.
B、The more a depositor has to deposit, the more careful he or she tends to be in selecting a bank.
C、The difference in the interest rates paid to depositors by different banks is not a significant factor in bank failures.
D、Potential depositors are able to determine which banks are secure against failure.

答案:

E
2答疑

[Sentence Correction]

试题详情

题目:

The only way for growers to salvage frozen citrus is to process them quickly into juice concentrate before they rot when warmer weather returns.

选项:

A、to process them quickly into juice concentrate before they rot when warmer weather returnsif they are quickly processed into juice concentrate before warmer weather returns to rot them
B、for them to be processed quickly into juice concentrate before the fruit rots when warmer weather returns
C、if the fruit is quickly processed into juice concentrate before they rot when warmer weather returns
D、to have it quickly processed into juice concentrate before warmer weather returns and rots the fruit

答案:

E
0评分
792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
2411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
2641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
923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
2117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
1459浏览

[OG]

The primary purpose of the passage is to
为什么选E不选B
0评分
948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
984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
230416浏览

[Undefined]

Analytical!
请问may老师,这题该用什么思路来做?
0评分
237540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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