问答

3答疑

[Problem Solving]

试题详情

题目:

A certain club has 20 members.  What is the ratio of the member of 5-member committees that can be formed from the members of the club to the number of 4-member committees that can be formed from the members of the club?

选项:

A、16 to 1
B、15 to 1
C、16 to 5
D、15 to 6
E、5 to 4

答案:

C
3答疑

[Problem Solving]

试题详情

题目:

For any integer k greater than 1, the symbol k* denotes the product of all the fractions of the form 1/t, where t is an integer between 1 and k, inclusive.  What is the value of 5*/4*?

选项:

A、5
B、5/4
C、4/5
D、1/4
E、1/5

答案:

E
3答疑

[Reading Comprehension]

试题详情

文章:

    Frazier and Mosteller assert that medical research could be improved by a move toward larger, simpler clinical trials of medical treatments. Currently, researchers collect far more background information on patients than is strictly required for their trials—substantially more than hospitals collect-thereby escalating costs of data collection, storage, and analysis. Although limiting information collection could increase the risk that researchers will overlook facts relevant to a study, Frazier and Mosteller contend that such risk, never entirely eliminable from research, would still be small in most studies. Only in research on entirely new treatments are new and unexpected variables likely to arise.

    Frazier and Mosteller propose not only that researchers limit data collection on individual patients but also that researchers enroll more patients in clinical trials, thereby obtaining a more representative sample of the total population with the disease under study. Often researchers restrict study participation to patients who have no ailments besides those being studied. A treatment judged successful under these ideal conditions can then be evaluated under normal conditions. Broadening the range of trial participants, Frazier and Mosteller suggest, would enable researchers to evaluate a treatment's efficacy for diverse patients under various conditions and to evaluate its effectiveness for different patient subgroups. For example, the value of a treatment for a progressive disease may vary according to a patient's stage of disease. Patients' ages may also affect a treatment's efficacy.

题目:

According to the passage, Frazier and Mosteller believe which of the following about medical research?

选项:

A、It is seriously flawed as presently conducted because researchers overlook facts that are relevant to the subject of their research.
B、It tends to benefit certain subgroups of patients disproportionately.
C、It routinely reveals new variables in research on entirely new treatments.
D、It can be made more accurate by limiting the amount of information researchers collect.
E、It cannot be freed of the risk that significant variables may be overlooked.

答案:

E
3答疑

[Reading Comprehension]

试题详情

文章:

Current feminist theory, in validating women’s own stories of their experience, has encouraged scholars of women’s history to view the use of women’s oral narratives as the methodology, next to the use of women’s written autobiography, that brings historians closest to the "reality" of women’s lives. Such narratives, unlike most standard histories, represent experience from the perspective of women, affirm the importance of women’s contributions, and furnish present-day women with historical continuity that is essential to their identity, individually and collectively.

Scholars of women’s history should, however, be as cautious about accepting oral narratives at face value as they already are about written memories. Oral narratives are no more likely than are written narratives to provide a disinterested commentary on events or people. Moreover, the stories people tell to explain themselves are shaped by narrative devices and storytelling conventions, as well as by other cultural and historical factors, in ways that the storytellers may be unaware of. The political rhetoric of a particular era, for example, may influence women’s interpretations of the significance of their experience. Thus a woman who views the Second World War as pivotal in increasing the social acceptance of women’s paid work outside the home may reach that conclusion partly and unwittingly because of wartime rhetoric encouraging a positive view of women’s participation in such work.

题目:

According to the passage, scholars of women’s history should refrain from doing which of the following?

选项:

A、Relying on traditional historical sources when women's oral narratives are unavailableFocusing on the influence of political rhetoric on women's perceptions to the exclusion of other equally important factors
B、Attempting to discover the cultural and historical factors that influence the stories women tell
C、Assuming that the conventions of women's written autobiographies are similar to the conventions of women's oral narratives
D、Accepting women's oral narratives less critically than they accept women's written histories

答案:

E
3答疑

[Reading Comprehension]

试题详情

文章:

    Many scholars have theorized that economic development, particularly industrialization and urbanization, contributes to the growth of participatory democracy; according to this theory, it would seem logical that women would both demand and gain suffrage in ever greater numbers whenever economic development expanded their economic opportunities. However, the economic development theory is inadequate to explain certain historical facts about the implementation of women's suffrage. For example, why was women's suffrage, instituted nationally in the United States in 1920, not instituted nationally in Switzerland until the 1970's? Industrialization was well advanced in both countries by 1920: over 33 percent of American workers were employed in various industries, as compared to 44 percent of Swiss workers. Granted, Switzerland and the United States diverged in the degree to which the expansion of industry coincided with the degree of urbanization: only 29 percent of the Swiss population lived in cities of 10,000 or more inhabitants by 1920. However, urbanization cannot fully explain women's suffrage. Within the United States prior to 1920, for example, only less urbanized states had granted women suffrage. Similarly, less urbanized countries such as Cambodia and Ghana had voting rights for women long before Switzerland did. It is true that Switzerland's urbanized cantons (political subdivisions) generally enacted women's suffrage legislation earlier than did rural cantons. However, these cantons often shared other characteristics—similar linguistic backgrounds and strong leftist parties—that may help to explain this phenomenon.

题目:

The passage suggests which of the following about urbanization in Switzerland and the United States by 1920?

选项:

A、A greater percentage of Swiss industrial workers than American industrial workers lived in urban areas.
B、There were more cities of 10,000 or more inhabitants in Switzerland than there were in the United States.
C、Swiss workers living in urban areas were more likely to be employed in industry than were American workers living in urban areas.
D、Urbanized areas of Switzerland were more likely than similar areas in the United States to have strong leftist parties.
E、A greater percentage of the United States population than the Swiss population lived in urban areas.

答案:

E
3答疑

[Critical Reasoning]

试题详情

题目:

In a certain wildlife park, park rangers are able to track the movements of many rhinoceroses because those animals wear radio collars.  When, as often happens, a collar slips off, it is put back on.  Putting a collar on a rhinoceros involves immobilizing the animal by shooting it with a tranquilizer dart.  Female rhinoceroses that have been frequently recollared have significantly lower fertility rates than uncollared females.  Probably, therefore, some substance in the tranquilizer inhibits fertility.
 
Which of the following is an assumption on which the argument depends?

选项:

A、The dose of tranquilizer delivered by a tranquilizer dart is large enough to give the rangers putting collars on rhinoceroses a generous margin of safety.
B、The fertility rate of uncollared female rhinoceroses in the park has been increasing in the past few decades.
C、Any stress that female rhinoceroses may suffer as a result of being immobilized and handled has little or no negative effect on their fertility.
D、The male rhinoceroses in the wildlife park do net lose their collars as often as the park's female rhinoceroses do.
E、The tranquilizer used in immobilizing rhinoceroses is the same as the tranquilizer used in working with other large mammals.

答案:

C
3答疑

[Sentence Correction]

试题详情

题目:

Recently implemented "shift-work equations" based on studies of the human sleep cycle have reduced sickness, sleeping on the job, fatigue among shift workers, and have raised production efficiency in various industries.

选项:

A、fatigue among shift workers, and have raised
B、fatigue among shift workers, and raised
C、and fatigue among shift workers while raising
D、lowered fatigue among shift workers, and raised
E、and fatigue among shift workers was lowered while raising

答案:

C
3答疑

[Critical Reasoning]

试题详情

题目:

Normally, the pineal gland governs a person’s sleep-wake cycle by secreting melatonin in response to the daily cycle of light and darkness as detected by the eye. Nonetheless, many people who are totally blind due to lesions in the visual cortex of the brain easily maintain a 24-hour sleep-wake cycle. So the neural pathway by which the pineal gland receives information from the eye probably does not pass through the visual cortex.

For purposes of evaluating the argument it would be most useful to establish which of the following?

选项:

A、Whether melatonin supplements help people who have difficulty maintaining a 24-hour sleep cycle to establish such a pattern
B、Whether the melatonin levels of most totally blind people who successfully maintain a 24-hour sleep-wake cycle change in response to changes in exposure to light and darkness
C、Whether melatonin is the only substance secreted by the pineal gland
D、Whether most people who do not have a 24-hour sleep-wake cycle nevertheless have a cycle of consistent duration
E、Whether there are any people with normal vision whose melatonin levels respond abnormally to periods of light and darkness

答案:

B
3答疑

[Sentence Correction]

试题详情

题目:

Unlike most severance packages, which require workers to stay
until the last day scheduled to collect, workers at the automobile
company are eligible for its severance package even if they find
a new job before they are terminated.

选项:

A、the last day scheduled to collect, workers at the automobile company are eligible for its severance package.
B、the last day they are scheduled to collect, workers are eligible for the automobile company's severance package
C、their last scheduled day to collect, the automobile company offers its severance package to workers.
D、their last scheduled day in order to collect, the automobile company's severance package is available to workers.
E、the last day that they are scheduled to collect, the automobile company's severance package is available to workers.

答案:

D
3答疑

[Problem Solving]

试题详情

题目:

In Country C, the unemployment rate among construction workers dropped from 16 percent on September 1, 1992, to 9 percent on September 1, 1996. If the number of construction workers was 20 percent greater on September 1, 1996, than on September 1, 1992, what was the approximate percent change in the number of unemployed construction workers over this period?

选项:

A、50% decrease
B、30% decrease
C、15% decrease
D、30% increase
E、55% increase

答案:

B
0评分
791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
2409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
2638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
2116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
947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
981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
230263浏览

[Undefined]

Analytical!
请问may老师,这题该用什么思路来做?
0评分
237387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
点我领取
免费专项课程
在线咨询