问答

1答疑

[Reading Comprehension]

试题详情

文章:

At the end of the nineteenth centum a rising interest in Native American customs and an increasing desire to understand Native American culture prompted ethnologists to begin recording the life stories of Native Americans. Ethnologists had a distinct reason for wanting to hear the stories:they were after linguistic or anthropological data that would supplement their own field observations, and they believed that the personal stories, even of a single individual, could increase their understanding of the cultures that they had been observing from without. In addition many ethnologists at the turn of the century believed that Native American manners and customs were rapidly disappearing, and that it was important to preserve for posterity as much information as could be adequately recorded before the cultures disappeared forever.

There were, however, arguments against this method as a way of acquiring accurate and complete information. Franz Boas, for example, described autobiographies as being of limited value, and useful chiefly for the study of the perversion of truth by memory,¨ while Paul Radin contended that investigators rarely spent enough time with the tribes they were observing, and inevitably derived results too tinged by the investigator's own emotional tone to be reliable.

Even more importantly, as these lire stories moved from the traditional oral mode to recorded written form, much was inevitably lost. Editors often decided what elements were significant to the field research on a given tribe. Native Americans recognized that the essence of their lives could not be communicated in English and that events that they thought significant were often deemed unimportant by their interviewers. Indeed, the very act of telling their stories could force Native American narrators to distort their cultures, as taboos had to be broken to speak the names of dead relatives crucial to their family stories.

Despite all of this, autobiography remains a useful tool for ethnological research:such personal reminiscences and impressions, incomplete as they may be, are likely to throw more light on the working of the mind and emotions than any amount of speculation from an ethnologist or ethnological theorist from another culture.

题目:

It can be inferred from the passage that a characteristic of the ethnological research on Native Americans conducted during the nineteenth century was the use of which of the following?

选项:

A、Investigators familiar with the culture under studyA language other than the informant's for recording lire stories
B、Life stories as the ethnologist's primary source of information
C、Complete transcriptions of informant's descriptions of tribal beliefs
D、Stringent guidelines for the preservation of cultural data

答案:

B
1答疑

[Data Sufficiency]

试题详情

题目:

If r is a constant and an = r·n for all positive integers n, for how many values of n is an < 100?
(1)     a50 = 500
(2)     a100 + a105 = 2,050

选项:

答案:

D
1答疑

[Critical Reasoning]

试题详情

题目:

Sasha: It must be healthy to follow a diet high in animal proteins and fats. Human beings undoubtedly evolved to thrive on such a diet, since our prehistoric ancestors ate large amounts of meat.

Jamal: But our ancestors also exerted themselves intensely in order to obtain this food, whereas most human beings today are much less physically active.

Jamal responds to Sasha by doing which of the following?

选项:

A、Refuting her statement about our prehistoric ancestors
B、Bringing forth a piece of information for the purpose of suggesting that she should qualify her main conclusion
C、Citing additional evidence that indirectly supports her conclusion and suggests a way to broaden it
D、Questioning whether her assumption about our prehistoric ancestors permits any conclusions about human evolution
E、Expressing doubts about whether most human beings today are as healthy as our prehistoric ancestors were

答案:

B
1答疑

[Problem Solving]

试题详情

题目:

The diagram shows a scale from the range of -5 to +5 and the range from -5 to +3 is shaded.

Which of the following inequalities is an algebraic expression for the shaded part of the number line above?

选项:

A、
B、
C、
D、
E、

答案:

E
1答疑

[Problem Solving]

试题详情

题目:

Working alone at its constant rate, machine K  took 3 hours to produce 1/4 of the units produced last Friday.  Then machine M  started working and the two machines, working simultaneously at their respective constant rates, took 6 hours to produce the rest of the units produced last Friday.  How many hours would it have taken machine M , working alone at its constant rate, to produce all of the units produced last Friday?

选项:

A、8
B、12
C、16
D、24
E、30

答案:

D
1答疑

[Sentence Correction]

试题详情

题目:

The coyote is one of several recent ecological success stories:  along with the white-tailed deer, the moose, and other species that are enlarging their natural domains, they have established themselves as supreme adapters in an era when the capability to adjust to the environmental changes wrought by human beings has created a whole new class of dominant large mammals.

选项:

A、they have established themselves as supreme adapters in an era when the capability
B、they have established themselves as being supreme adapters in an era when being able
C、it has established itself as a supreme adapter in an era when to be able
D、it has established itself as being a supreme adapter in an era when its ability
E、it has established itself as a supreme adapter in an era when the ability

答案:

E
1答疑

[Reading Comprehension]

试题详情

文章:

Line         While the most abundant and dominant species
  within a particular ecosystem is often crucial in
  perpetuating the ecosystem, a “keystone” species,
  here defined as one whose effects are much larger
(5) than would be predicted from its abundance, can
  also play a vital role. But because complex species
  interactions may be involved, identifying a keystone
  species by removing the species and observing
  changes in the ecosystem is problematic. It might
(10) seem that certain traits would clearly define a species
  as a keystone species; for example,
  Pisaster ochraceus is often a keystone predator
  because it consumes and suppresses mussel
  populations, which in the absence of this starfish
(15) can be a dominant species. But such predation on a
  dominant or potentially dominant species occurs in
  systems that do as well as in systems that do not
  have species that play keystone roles. Moreover,
  whereas P. ochraceus occupies an unambiguous
(20) keystone role on wave-exposed rocky headlands,
  in more wave-sheltered habitats the impact of
  P. ochraceus predation is weak or nonexistent,
  and at certain sites sand burial is responsible for
  eliminating mussels. Keystone status appears to
(25) depend on context, whether of particular
  geography or of such factors as community
  diversity (for example, a reduction in species
  diversity may thrust more of the remaining species
  into keystone roles) and length of species
(30) interaction (since newly arrived species in particular
  may dramatically affect ecosystems).


题目:

The passage mentions which of the following as a factor that affects the role of P. ochraceus as a keystone species within different habitats?

选项:

A、The degree to which the habitat is sheltered from waves
B、The degree to which other animals within a habitat prey on mussels
C、The fact that mussel populations are often not dominant within some habitats occupied by P. ochraceus
D、The size of the P. ochraceus population within the habitat
E、The fact that there is great species diversity within some habitats occupied by P. ochraceus

答案:

A
1答疑

[Critical Reasoning]

试题详情

文章:

Many people argue that tobacco advertising plays a crucial role in causing teen-agers to start or continuesmoking. In Norway, however, where there has been a ban on tobacco advertising since 1975, smoking is atleast as prevalent among teen-agers as it is in countries that do not ban such advertising.

题目:

Which of the following statements draws the most reliable conclusion from the information above?

选项:

A、Tobacco advertising cannot be the only factor that affects the prevalence of smoking among teen-agers.Advertising does not play a role in causing teen-agers to start or continue smoking.
B、Banning tobacco advertising does not reduce the consumption of tobacco. 
C、More teen-agers smoke if they are not exposed to tobacco advertising than if they are.
D、Most teen-agers who smoked in 1975 did not stop when the ban on tobacco advertising was implemented. 

答案:

A
1答疑

[Critical Reasoning]

试题详情

题目:

A certain species of desert lizard digs tunnels in which to lay its eggs. The eggs must incubate inside the tunnel for several weeks before hatching, and they fail to hatch if they are disturbed at any time during this incubation period. Yet these lizards guard their tunnels for only a few days after laying their eggs.

Which of the following, if true, most helps explain why there is no need for lizards to guard their tunnels for more than a few days?

选项:

A、The eggs are at risk of being disturbed only during the brief egg-laying season when many lizards are digging in a relatively small area.
B、The length of the incubation period varies somewhat from one tunnel to another.
C、Each female lizard lays from 15 to 20 eggs, only about 10 of which hatch even if the eggs are not disturbed at any time during the incubation period.
D、The temperature and humidity within the tunnels will not be suitable for the incubating eggs unless the tunnels are plugged with sand immediately after the eggs are laid.
E、The only way to disturb the eggs of this lizard species is by opening up one of the tunnels in which they are laid.

答案:

A
1答疑

[Sentence Correction]

试题详情

题目:

Most vaccines are derived from weakened or killed strains of the same virus that they prevent, unlike the derivation of smallpox vaccine from a different virus altogether.

选项:

A、(A) the derivation of smallpox vaccine from a different virus altogether
B、(B) smallpox vaccine, which is derived from a different virus altogether
C、(C) smallpox's vaccine, which gets derived from a different virus altogether
D、(D) when smallpox vaccine is derived from an altogether different virus
E、(E) the altogether different virus from which smallpox vaccine is derived

答案:

B
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
3255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
2747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
302440浏览

[Undefined]

Analytical!
请问may老师,这题该用什么思路来做?
0评分
309567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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