[Problem Solving]
试题详情
题目：
If f is the function defined by f(x) = x2 (1-x)2 for all x, then f(1-x) =
选项:
A、f(x)
B、[f(x)]2
C、1 - f(x)
D、(1-x) f(x)
E、f(1) - f(x)
答案:
A
问答
3答疑
3答疑
[Reading Comprehension]
试题详情
文章：
| Line | A small number of the forest species of |
| lepidoptera (moths and butterflies, which exist as | |
| caterpillars during most of their life cycle) exhibit | |
| regularly recurring patterns of population growth | |
| (5) | and decline—such fluctuations in population are |
| known as population cycles. Although many different | |
| variables influence population levels, a regular pattern | |
| such as a population cycle seems to imply a | |
| dominant, driving force. Identification of that driving | |
| (10) | force, however, has proved surprisingly elusive |
| despite considerable research. The common | |
| approach of studying causes of population cycles by | |
| measuring the mortality caused by different agents, | |
| such as predatory birds or parasites, has been | |
| (15) | unproductive in the case of lepidoptera. Moreover, |
| population ecologists’ attempts to alter cycles by | |
| changing the caterpillars’ habitat and by reducing | |
| caterpillar populations have not succeeded. In short, | |
| the evidence implies that these insect populations, if | |
| (20) | not self-regulating, may at least be regulated by an |
| agent more intimately connected with the insect than | |
| are predatory birds or parasites. | |
| Recent work suggests that this agent may be a | |
| virus. For many years, viral disease had been reported | |
| (25) | in declining populations of caterpillars, but population |
| ecologists had usually considered viral disease to | |
| have contributed to the decline once it was underway | |
| rather than to have initiated it. The recent work has | |
| been made possible by new techniques of molecular | |
| (30) | biology that allow viral DNA to be detected at low |
| concentrations in the environment. Nuclear | |
| polyhedrosis viruses are hypothesized to be the | |
| driving force behind population cycles in lepidoptera | |
| in part because the viruses themselves follow an | |
| (35) | infectious cycle in which, if protected from direct |
| sun light, they may remain virulent for many years | |
| in the environment, embedded in durable crystals of | |
| polyhedrin protein. Once ingested by a caterpillar, | |
| the crystals dissolve, releasing the virus to infect | |
| (40) | the insect’s cells. Late in the course of the infection, |
| millions of new virus particles are formed and | |
| enclosed in polyhedrin crystals. These crystals | |
| reenter the environment after the insect dies and | |
| decomposes, thus becoming available to infect | |
| (45) | other caterpillars. |
| One of the attractions of this hypothesis is its broad | |
| applicability. Remarkably, despite significant differences | |
| in habitat and behavior, many species of lepidoptera | |
| have population cycles of similar length, between eight | |
| (50) | and eleven years. Nuclear polyhedrosis viral infection is |
| one factor these disparate species share. |
题目：
It can be inferred from the passage that while inside its polyhedrin protein crystals, the nuclear polyhedrosis virus
选项:
A、is exposed to direct sunlight
B、is attractive to predators
C、cannot infect caterpillars’ cells
D、cannot be ingested by caterpillars
E、cannot be detected by new techniques of molecular biology
答案:
C
3答疑
[Reading Comprehension]
试题详情
文章：
| Line | It is an odd but indisputable fact that the |
| seventeenth-century English women who are | |
| generally regarded as among the forerunners of | |
| modern feminism are almost all identified with the | |
| (5) | Royalist side in the conflict between Royalists and |
| Parliamentarians known as the English Civil Wars. | |
| Since Royalist ideology is often associated with the | |
| radical patriarchalism of seventeenth-century | |
| political theorist Robert Filmer—a patriarchalism | |
| (10) | that equates family and kingdom and asserts the |
| divinely ordained absolute power of the king and, | |
| by analogy, of the male head of the household— | |
| historians have been understandably puzzled by the | |
| fact that Royalist women wrote the earliest | |
| (15) | extended criticisms of the absolute subordination |
| of women in marriage and the earliest systematic | |
| assertions of women’s rational and moral equality | |
| with men. Some historians have questioned the | |
| facile equation of Royalist ideology with Filmerian | |
| (20) | patriarchalism; and indeed, there may have been |
| no consistent differences between Royalists and | |
| Parliamentarians on issues of family organization | |
| and women’s political rights, but in that case one | |
| would expect early feminists to be equally divided | |
| (25) | between the two sides. |
| Catherine Gallagher argues that Royalism | |
| engendered feminism because the ideology of | |
| absolute monarchy provided a transition to an | |
| ideology of the absolute self. She cites the example | |
| (30) | of the notoriously eccentric author Margaret |
| Cavendish (1626–1673), duchess of Newcastle. | |
| Cavendish claimed to be as ambitious as any | |
| woman could be, but knowing that as a woman she | |
| was excluded from the pursuit of power in the real | |
| (35) | world, she resolved to be mistress of her own |
| world, the “immaterial world” that any person can | |
| create within her own mind—and, as a writer, on | |
| paper. In proclaiming what she called her | |
| “singularity,” Cavendish insisted that she was a | |
| (40) | self-sufficient being within her mental empire, the |
| center of her own subjective universe rather than a | |
| satellite orbiting a dominant male planet. In | |
| justifying this absolute singularity, Cavendish | |
| repeatedly invoked the model of the absolute | |
| (45) | monarch, a figure that became a metaphor for the |
| self-enclosed, autonomous nature of the individual | |
| person. Cavendish’s successors among early | |
| feminists retained her notion of woman’s sovereign | |
| self, but they also sought to break free from the | |
| (50) | complete political and social isolation that her |
| absolute singularity entailed. |
题目：
Which of the following, if true, would most clearly undermine Gallagher’s explanation of the link between Royalism and feminism?
选项:
A、Because of their privileged backgrounds, Royalist women were generally better educated than were their Parliamentarian counterparts.
B、Filmer himself had read some of Cavendish’s early writings and was highly critical of her ideas.
C、Cavendish’s views were highly individual and were not shared by the other Royalist women who wrote early feminist works.
D、The Royalist and Parliamentarian ideologies were largely in agreement on issues of family organization and women’s political rights.
E、The Royalist side included a sizable minority faction that was opposed to the more radical tendencies of Filmerian patriarchalism.
答案:
C
3答疑
[Sentence Correction]
试题详情
题目：
Rivaling the pyramids of Egypt or even the ancient cities of the Maya as an achievement, the army of terra-cotta warriors created to protect Qin Shi Huang, China's first emperor, in his afterlife is more than 2,000 years old and took 700,000 artisans more than 36 years to complete them.
选项:
A、took 700,000 artisans more than 36 years to complete them
B、took 700,000 artisans more than 36 years to complete it
C、took 700,000 artisans more than 36 years to complete
D、700,000 artisans took more than 36 years to complete
E、to complete them took 700,000 artisans more than 36 years
答案:
C
3答疑
[Sentence Correction]
试题详情
题目：
Often incorrectly referred to as a tidal wave, a tsunami, a seismic sea wave that can reach up to 150 miles per hour in speed and 200 feet high, is caused by underwater earthquakes or volcanic eruptions.
选项:
A、up to 150 miles per hour in speed and 200 feet high, is
B、up to 150 miles per hour in speed and heights of up to 200 feet, is
C、speeds of up to 150 miles per hour and 200 feet high, are
D、speeds of up to 150 miles per hour and heights of up to 200 feet, is
E、speeds of up to 150 miles per hour and as high as 200 feet, are
答案:
D
3答疑
[Critical Reasoning]
试题详情
题目：
Mayor: Migrating shorebirds stop at our beach just to feed on horseshoe-crab eggs, a phenomenon that attracts tourists. To bring more tourists, the town council plans to undertake a beach reclamation project to double the area available to crabs for nesting.
Birdwatcher: Without a high density of crabs on a beach, migrating shorebirds will go hungry because shorebirds only eat eggs that a crab happens to uncover when it is digging its own nest.
Which of the following, if true, would provide the mayor with the strongest counter to the birdwatcher's objection?
选项:
A、Every year a certain percentage of crabs are caught by fishermen as bait for eel traps.
B、Horseshoe crabs are so prolific that given favorable circumstances their numbers increase rapidly.
C、On average, tourists who come to the town in order to watch birds spend more money there than tourists who come for other purposes.
D、The additional land made available by the reclamation project will give migrating shorebirds more space.
E、Some of the migrating shorebirds make only one stop during their migration form South America to Canada.
答案:
B
3答疑
[Critical Reasoning]
试题详情
题目：
Over the past five years, the price gap between name-brand cereals and less expensive store-brand cereals has become so wide that consumers have been switching increasingly to store brands despite the name brands' reputation for better quality. To attract these consumers back, several manufacturers of name-brand cereals plan to narrow the price gap between their cereals and store brands to less than what it was five years ago.
Which of the following, if true, most seriously calls into question the likelihood that the manufacturers' plan will succeed in attracting back a large percentage of consumers who have switched to store brands?
选项:
A、There is no significant difference among manufacturers of name-brand cereals in the prices they charge for their products.
B、Consumers who have switched to store-brand cereals have generally been satisfied with the quality of those cereals.
C、Many consumers would never think of switching to store-brand cereals because they believe the name brand cereals to be of better quality.
D、Because of lower advertising costs, stores are able to offer their own brands of cereals at significantly lower prices than those charged for name-brand cereals.
E、Total annual sales of cereals-including both name-brand and store-brand cereals-have not increased significantly over the past five years.
答案:
B
3答疑
[Reading Comprehension]
试题详情
文章：
The term "episodic memory" was introduced by Tulving to refer to what he considered a uniquely human capacity-the ability to recollect specific past events, to travel back into the past in one's own mind-as distinct from the capacity simply to use information acquired through past experiences. Subsequently, Clayton et al. developed criteria to test for episodic memory in animals. According to these criteria, episodic memories are not of individual bits of information; they involvemultiple components of a single event "bound" together. Clayton sought to examine evidence of scrub jays' accurate memory of "what," "where," and "when" information and their binding of this information. In the wild, these birds store food for retrieval later during periods of food scarcity. Clayton's experiment required jays to remember the type, location, and freshness of stored food based on a unique learning event. Crickets were stored in one location and peanuts in another. Jays prefer crickets, but crickets degrade more quickly. Clayton's birds switched their preference from crickets to peanuts once the food had been stored for a certain length of time, showing that they retain information about the what, the where, and the when. Such experiments cannot, however, reveal whether the birds were reexperiencing the past when retrieving the information. Clayton acknowledged this by using the term "episodic-like" memory.
题目：
In order for Clayton's experiment to show that scrub jays have episodic-like memory, which of the following must be true in the experiment?
选项:
A、Some of the jays retrieved stored peanuts on the first occasion they were allowed to retrieve food.
B、All the crickets were retrieved before any of the peanuts were.
C、The peanuts were stored further away than the crickets.
D、When a jay attempted to retrieve a cricket or a peanut, the jay was prevented from eating it.
E、Throughout the experiment the jays were fed at levels typical of a time of scarcity.
答案:
E
3答疑
[Critical Reasoning]
试题详情
题目：
In order to raise revenue, the federal government planned a tax amnesty program that allows tax delinquents to pay all owed tax without added financial penalty. However, economists projected that the federal government would collect a far lower percentage of total tax owed by delinquents than did state governments implementing similar programs.
Which of the following, if true, would most contribute to an explanation of the economists' projections?
选项:
A、Tax amnesty programs are only successful if they are widely publicized.
B、Most people who honestly pay their state tax are equally honest in paying their federal tax.
C、Although federal tax delinquents usually must pay high financial penalties, the states require far lower financial penalties.
D、The state tax rate varies considerably from state to state, but the federal tax is levied according to laws which apply to citizens of all the states.
E、Unlike most federal tax delinquents, most state tax delinquents fail to pay state tax because of an oversight rather than a decision not to pay.
答案:
E
3答疑
[Sentence Correction]
试题详情
题目：
Gasoline marketing is undergoing major changes as stations often not only add convenience stores but also combine with major fast-food chains to build complexes where customers can shop and eat as well as buy gasoline.
选项:
A、 not only add convenience stores but also combine with major fast-food chains to build
B、 not only add convenience stores but also they combine with major fast-food chains to build
C、 are not only adding convenience stores but also in combination with major fast-food chains they build
D、 add not only convenience stores, but also combining with major fast-food chains to build
E、 are not only adding convenience stores, but also in combining with major fast-food chains they build
答案:
A
0评分
1285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
3633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
4012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
1334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
2989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
2074浏览
0评分
1331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
1400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
330728浏览
0评分
337854浏览
