问答

4答疑

[Problem Solving]

登录查看答疑

试题详情

题目：

Of the 300 subjects who participated in an experiment using virtual-reality therapy to reduce their fear of heights, 40 percent experienced sweaty palms, 30 percent experienced vomiting, and 75 percent experienced dizziness. If all of the subjects experienced at least one of these effects and 35 percent of the subjects experienced exactly two of these effects, how many of the subjects experienced only one of these effects?

选项:

A、105
B、125
C、130
D、180
E、195

答案:

D
4答疑

[Critical Reasoning]

登录查看答疑

试题详情

题目：

City council member: Demand for electricity has been increasing by 1.5 percent a year, and there simply is no more space to build additional power plants to meet future demand increases. We must therefore begin to curtail usage, which is why I propose passing ordinances requiring energy-conservation measures in all city departments.

The city council member’s proposal assumes which of the following?

选项:

A、Existing power plants do not have the capacity to handle all of the projected increase in demand for electricity.
B、No city departments have implemented energy-conservation measures voluntarily.
C、Passing ordinances designed to curtail electricity usage will not have negative economic consequences for the city.
D、Residential consumers are not responsible for the recent increases in demand for electricity.
E、City departments that successfully conserve energy will set a good example for residential and industrial consumers of electricity.

答案:

A
4答疑

[Sentence Correction]

登录查看答疑

试题详情

题目：

About 5 million acres in the United States have been invaded by leafy spurge, a herbaceous plant from Eurasia with milky sap that gives mouth sores to cattle, displacing grasses and other cattle food and rendering rangeland worthless.

选项:

答案:

B
4答疑

[Reading Comprehension]

登录查看答疑

试题详情

文章：

Line        Resin is a plant secretion that hardens when
 exposed to air; fossilized resin is called amber.
 Although Pliny in the first century recognized that
 amber was produced from “marrow discharged by
(5)trees,” amber has been widely misunderstood to be
 a semiprecious gem and has even been described
 in mineralogy textbooks. Confusion also persists
 surrounding the term “resin,” which was defined
 before rigorous chemical analyses were available.
(10)Resin is often confused with gum, a substance
 produced in plants in response to bacterial infections,
 and with sap, an aqueous solution transported
 through certain plant tissues. Resin differs from both
 gum and sap in that scientists have not determined a
(15)physiological function for resin.
      In the 1950s, entomologists posited that resin
 may function to repel or attract insects. Fraenkel
 conjectured that plants initially produced resin in
 nonspecific chemical responses to insect attack
(20)and that, over time, plants evolved that produced
 resin with specific repellent effects. But some insect
 species, he noted, might overcome the repellent
 effects, actually becoming attracted to the resin.
 This might induce the insects to feed on those
(25)plants or aid them in securing a breeding site.
 Later researchers suggested that resin mediates
 the complex interdependence, or “coevolution,” of
 plants and insects over time. Such ideas led to the
 development of the specialized discipline of chemical
(30)ecology, which is concerned with the role of plant
 chemicals in interactions with other organisms and
 with the evolution and ecology of plant antiherbivore
 chemistry (plants' chemical defenses against attack
 by herbivores such as insects).


题目：

The author refers to “bacterial infections” (see line 11) most likely in order to

选项:

A、to both its introduction of new models in North America that are less expensive in their manufacture and to success in
B、to both its introduction of new models in North America that are less expensive in manufacturing and success in its
C、to both its introducing new models in North America that are less expensive in manufacturing and to success in
D、both to its introduction of new models in North America that are less expensive to manufacture and to success in
E、both to its introducing new models in North America that are less expensive in their manufacturing and to success in its

答案:

A
4答疑

[Sentence Correction]

登录查看答疑

试题详情

题目：

While most of the earliest known ball courts in Mesoamerica date to 900–400 b.c., waterlogged latex balls found at El Manati and representations of ballplayers painted on ceramics found at San Lorenzo attest to the fact that the Mesoamerican ballgame was well established by the mid-thirteenth century b.c.

选项:

答案:

A
4答疑

[Reading Comprehension]

登录查看答疑

试题详情

文章：

Line         There are recent reports of apparently drastic
  declines in amphibian populations and of extinctions
  of a number of the world’s endangered amphibian
  species. These declines, if real, may be signs of a
(5) general trend toward extinction, and many
  environmentalists have claimed that immediate
  environmental action is necessary to remedy
  this “amphibian crisis,” which, in their view, is an
  indicator of general and catastrophic environmental
(10) degradation due to human activity.
       To evaluate these claims, it is useful to make a
  preliminary distinction that is far too often ignored.
  A declining population should not be confused with
  an endangered one. An endangered population is
(15) always rare, almost always small, and, by definition,
  under constant threat of extinction even without a
  proximate cause in human activities. Its disappearance,
  however unfortunate, should come as no great
  surprise. Moreover, chance events—which may
(20) indicate nothing about the direction of trends in
  population size—may lead to its extinction. The
  probability of extinction due to such random factors
  depends on the population size and is independent of
  the prevailing direction of change in that size.
(25)      For biologists, population declines are potentially
  more worrisome than extinctions. Persistent
  declines, especially in large populations, indicate a
  changed ecological context. Even here, distinctions
  must again be made among declines that are only
(30) apparent (in the sense that they are part of habitual
  cycles or of normal fluctuations), declines that take
  a population to some lower but still acceptable
  level, and those that threaten extinction (e.g., by
  taking the number of individuals below the minimum
(35) viable population). Anecdotal reports of population
  decreases cannot distinguish among these
  possibilities, and some amphibian populations have
  shown strong fluctuations in the past.
       It is indisputably true that there is simply not
(40) enough long-term scientific data on amphibian
  populations to enable researchers to identify real
  declines in amphibian populations. Many fairly
  common amphibian species declared all but extinct
  after severe declines in the 1950s and 1960s
(45) have subsequently recovered, and so might
  the apparently declining populations that have
  generated the current appearance of an amphibian
  crisis. Unfortunately, long-term data will not soon
  be forthcoming, and postponing environmental
(50) action while we wait for it may doom species and
  whole ecosystems to extinction.


题目：

Which of the following most accurately describes the organization of the passage?

选项:

A、A question is raised, a distinction regarding it is made, and the question is answered.
B、An interpretation is presented, its soundness is examined, and a warning is given.
C、A situation is described, its consequences are analyzed, and a prediction is made.
D、Two interpretations of a phenomenon are described, and one of them is rejected as invalid.
E、Two methods for analyzing a phenomenon are compared, and further study of the phenomenon is recommended.

答案:

B
4答疑

[Sentence Correction]

登录查看答疑

试题详情

题目：

According to some analysts, the gains in the stock market reflect growing confidence that the economy will avoid the recession that many had feared earlier in the year and instead come in for a "soft landing," followed by a gradual increase in business activity.

选项:

A、that the economy will avoid the recession that many had feared earlier in the year and instead come
B、in the economy to avoid the recession, what many feared earlier in the year, rather to come
C、in the economy's ability to avoid the recession, something earlier in the year many had feared, and instead to come
D、in the economy to avoid the recession many were fearing earlier in the year, and rather to come
E、that the economy will avoid the recession that was feared earlier this year by many, with it instead coming

答案:

A
4答疑

[Critical Reasoning]

登录查看答疑

试题详情

题目：

Because postage rates are rising, Home Decorator magazine plans to maximize its profits by reducing by one half the number of issues it publishes each year.  The quality of articles, the number of articles published per year, and the subscription price will not change.  Market research shows that neither subscribers nor advertisers will be lost if the magazine's plan is instituted.
Which of the following, if true, provides the strongest evidence that the magazine's profits are likely to decline if the plan is instituted?

选项:

A、With the new postage rates, a typical issue under the proposed plan would cost about one-third more to mail than a typical current issue would.
B、The majority of the magazine's subscribers are less concerned about a possible reduction in the quantity of the magazine's articles than about a possible loss of the current high quality of its articles.
C、Many of the magazine's long-time subscribers would continue their subscriptions even if the subscription price were increased.
D、Most of the advertisers that purchase advertising space in the magazine will continue to spend the same amount on advertising per issue as they have in the past.
E、Production costs for the magazine are expected to remain stable.

答案:

D
4答疑

[Sentence Correction]

登录查看答疑

试题详情

题目：

Unlike the virginal, whose single set of strings runs parallel to the front edge of the instrument, the harpsichord’s several sets of strings are placed at right angles to its front edge.

选项:

A、whose single set of strings runs parallel to the front edge of the instrument, the harpsichord’s several sets of strings are
B、with a single set of strings running parallel to the front edge of the instrument, the several sets of strings of the harpsichord are
C、which has a single set of strings that runs parallel to the front edge of the instrument, in the case of the harpsichord, several sets of strings are
D、which has a single set of strings that run parallel to the front edge of the instrument, the harpsichord has several sets of strings
E、in which a single set of strings run parallel to the front edge of the instrument, the harpsichord’s several sets of strings are

答案:

D
4答疑

[Critical Reasoning]

登录查看答疑

试题详情

题目：

Unprecedented industrial growth in the country of Remo has created serious environmental problems because factories there lack adequate pollution-control systems.  Remo is developing a clean growth plan that includes environmental regulations that will require the installation of such systems.  Since no companies in Remo currently produce pollution-control systems, the plan, if implemented, will create significant opportunities for foreign exporters to market pollution-control systems.
 
Which of the following, if true, most seriously weakens the argument?

选项:

A、The clean growth plan will provide tax incentives for local businesses to develop and manufacture pollution-control devices.
B、Foreign exporters would provide factory-trained technicians to maintain the pollution-control systems sold to Remo.
C、Industrial lobbyists sponsored by local businesses in Remo are trying to prevent the implementation of the government regulations.
D、The regulations that Remo plans to implement are much less strict than those in neighboring nations.
E、Pollution in Remo has caused serious health problems for workers, contributing to a significant increase in the number of workdays lost to illness.

答案:

A
0评分
1126浏览

[Undefined]

登录查看答疑
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
3190浏览

[Undefined]

登录查看答疑
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
3518浏览

[Undefined]

登录查看答疑
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
1177浏览

[Undefined]

登录查看答疑
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
2701浏览

[GWD]

登录查看答疑
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
1844浏览

[OG]

登录查看答疑
The primary purpose of the passage is to
为什么选E不选B
0评分
1193浏览

[Undefined]

登录查看答疑
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
1248浏览

[Undefined]

登录查看答疑
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
295946浏览

[Undefined]

登录查看答疑
Analytical!
请问may老师，这题该用什么思路来做？
0评分
303074浏览

[Undefined]

登录查看答疑
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