问答

3答疑

[Critical Reasoning]

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题目：

From 1973 to 1976, total United States consumption of cigarettes increased 3.4 percent, and total sales of chewing tobacco rose 18.0 percent.  During the same period, total United States population increased 5.0 percent.
 
If the statements above are true, which of the following conclusions can be properly drawn?

选项:

A、United States manufacturers of tobacco products had higher profits in 1976 than in 1973.
B、Per capita consumption of cigarettes in the United States was lower in 1976 than in 1973.
C、The proportion of nonsmokers in the United States population dropped slightly between 1973 and 1976.
D、United States manufacturers of tobacco products realize a lower profit on cigarettes than on chewing tobacco.
E、A large percentage of United States smokers switched from cigarettes to chewing tobacco between 1973 and 1976.

答案:

B
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[Sentence Correction]

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题目：

Chinese public buildings erected under a construction code of the Sung dynasty have withstood earthquakes well because the white cedar used has four times the tensile strength of steel and the timber frame, incorporating many joints and few nails, is flexible.

选项:

A、used has four times the tensile strength of steel and the timber frame, incorporating
B、used in them has four times the tensile strength of steel has and the timber frame, incorporating
C、that was used in them has four times the tensile strength steel has, and the timber frame, incorporating
D、that was used has four times as much tensile strength as steel, and the timber frame incorporates
E、that was used has four times the tensile strength steel does, and the timber frame incorporates

答案:

A
3答疑

[Critical Reasoning]

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题目：

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

选项:

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

答案:

E
3答疑

[Reading Comprehension]

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文章：

    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 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 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 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 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 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 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 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 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 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 and eleven years. Nuclear polyhedrosis viral infection is one factor these disparate species share.

题目：

The primary purpose of the passage is to

选项:

A、describe the development of new techniques that may help to determine the driving force behind population cycles in lepidoptera
B、present evidence that refutes a particular theory about the driving force behind population cycles in lepidoptera
C、present a hypothesis about the driving force behind population cycles in lepidoptera
D、describe the fluctuating patterns of population cycles in lepidoptera
E、question the idea that a single driving force is behind population cycles in lepidoptera

答案:

C
3答疑

[Data Sufficiency]

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题目：

If n  and k  are positive integers, is n   divisible by 6?
(1)     n = k (k + 1)(k - 1)
(2)     k – 1 is a multiple of 3.

选项:

答案:

A
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[Critical Reasoning]

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题目：

Which of the following most logically completes the argument below?

NowNews, although still the most popular magazine covering cultural events in Kalopolis, has recently suffered a significant drop in advertising revenue because of falling circulation. Many readers have begun buying a competing magazine that, at 50 cents per copy, costs less than NowNews at $1.50 per copy. In order to boost circulation and thus increase advertising revenue, NowNews’s publisher has proposed making it available at no charge, but this proposal has a serious drawback, since __________.

选项:

A、Those Kalopolis residents with the greatest interest in cultural events are regular readers of both magazines.
B、One reason NowNews’s circulation fell was that its competitor’s reporting on cultural events was superior.
C、The newsstands and stores that currently sell NowNews will no longer carry it if it is being given away for free.
D、At present, 10 percent of the total number of copies of each issue of NowNews are distributed free to students on college campuses in the Kalopolis area.
E、NowNews’s competitor would begin to lose large amounts of money if it were forced to lower its cover price.

答案:

C
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[Reading Comprehension]

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文章：

Line         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
(5) 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
(10) 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.
(15)      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
(20) 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
(25) 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
(30) 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：

The passage is primarily concerned with

选项:

A、identifying two practices in medical research that may affect the accuracy of clinical trials
B、describing aspects of medical research that tend to drive up costs
C、evaluating an analysis of certain shortcomings of current medical research practices
D、describing proposed changes to the ways in which clinical trials are conducted
E、explaining how medical researchers have traditionally conducted clinical trials and how such trials are likely to change

答案:

D
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[Sentence Correction]

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题目：

There is nowhere in early American literature where the influence of Jane Austen is so apparent as the novels of James Fenimore Cooper.

选项:

A、There is nowhere in early American literature where the influence of Jane Austen is so apparent as 
B、In early American literature, nowhere is Jane Austin's Influence so apparent than in
C、It is nowhere more apparent in early American literature that Jane Austen was an influence as in 
D、Nowhere in early American literature is the influence of Jane Austen more apparent than in 
E、Nowhere in early American literature is it more apparent that Jane Austen had an influence than

答案:

D
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[Critical Reasoning]

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题目：

Paleontologist: About 2.8 million years ago, many species that lived near the ocean floor suffered substantial population declines.  These declines coincided with the onset of an ice age.  The notion that cold killed those bottom-dwelling creatures outright is misguided, however; temperatures near the ocean floor would have changed very little.  Nevertheless, the cold probably did cause the population declines, though indirectly.  Many bottom-dwellers depended for food on plankton, small organisms that lived close to the surface and sank to the bottom when they died.  Most probably, the plankton suffered a severe population decline as a result of sharply lower temperatures at the surface, depriving many bottom-dwellers of food.
In the paleontologist's reasoning, the two portions in boldface play which of the following roles?

选项:

A、The first introduces the hypothesis proposed by the paleontologist; the second is a judgment offered in spelling out that hypothesis.
B、The first introduces the hypothesis proposed by the paleontologist; the second is a position that the paleontologist opposes.
C、The first is an explanation challenged by the paleontologist; the second is an explanation proposed by the paleontologist.
D、The first is a judgment advanced in support of a conclusion reached by the paleontologist; the second is that conclusion.
E、The first is a generalization put forward by the paleontologist; the second presents certain exceptional cases in which that generalization does not hold.

答案:

A
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[Critical Reasoning]

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题目：

Museums that house Renaissance oil paintings typically store them in envbironments that are carefully kept within narrow margins of temperature and humidity to inhibit any deterioration. Laboratory tests have shown that the kind of oil paint used in these paintings actually adjusts to climatic changes quite well. If, as some museum directors believe,paint is the most sensitive substance in these works, then by relaxing the standards for temperature and humidity control, museums can reduce energy costs without risking damage to these paintings. Museums would be rash to relax those standards, however, since results of preliminary tests indicate that gesso, a compound routinely used by Renaissance artists to help paint adhere to the canvas, is unable to withstand significant variations in humidity.
 
In the argument above, the two portions in boldface play which of the following roles?

选项:

A、The first is an objection that has been raised against the position taken by the argument; the second is the position taken by the argument.
B、The first is the position taken by the argument; the second is the position that the argument calls into question.
C、The first is a judgment that has been offered in support of the position that the argument calls into question; the second is a circumstance on which that judgment is, in part based.
D、The first is a judgment that has been offered in support of the position that the argument calls into question; the second is that position.
E、The first is a claim that the argument calls into question; the second is the position taken by the argument.

答案:

D
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[Undefined]

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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？
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2794浏览

[Undefined]

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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
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[Undefined]

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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
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[Undefined]

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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？
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[GWD]

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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
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[OG]

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The primary purpose of the passage is to
为什么选E不选B
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[Undefined]

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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
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[Undefined]

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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
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[Undefined]

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Analytical!
请问may老师，这题该用什么思路来做？
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[Undefined]

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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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