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GMAT考试每日一练(2019/6/21)
1题:Onepervasivetheoryexplainstheintroductionofbreakfastcerealsintheearly1900sasaresultofthegrowingnumberofautomobiles,whichledtoadeclineinhorseownershipandasubsequentgrainglut;bypersuadingpeopletoeatwhathadpreviouslybeenhorsefeed,marketequilibriumwasrestored.()
(A)bypersuadingpeopletoeatwhathadpreviouslybeenhorsefeed,marketequilibriumwasrestored
(B)persuadingpeopletoeatwhathadpreviouslybeenhorsefeedrestoredmarketequilibrium
(C)bypersuadingpeopletoeatwhathadpreviouslybeenhorsefeed,itrestoredmarketequilibrium
(D)thepersuasionofpeopletoeatwhathadpreviouslybeenhorsefeedrestoredmarketequilibrium
(E)marketequilibriumwasrestoredwhenpeoplewerepersuadedtoeatformerhorsefeed
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2题:The following questions present a sentence, part of which or all of which is underlineD、Beneath the sentence, you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.
These questions test correctness and effectiveness of expression. In choosing your answer, follow the requirements of standard writtenEnglish; that is, pay attention to grammar, choice of words, and sentence construction.Choose the answer that produces the most effective sentence; this answer should be clear and exact, without awkwardness, ambiguity, redundancy, or grammatical error.
The eighteenth-century author Jonathan Swift once suggested in a satiric essay Irish farmers could eat their children to address the twin problems of overpopulation and lack of food.
A、Irish farmers could eat their children to address the twin problems of overpopulation and lack of food
B、that the twin problems of overpopulation and lacking food could be addressed by the eating of children by Irish farmers
C、of the twin problems of Irish farmers, overpopulation and a lack of food, could be addressed by the eating of their children
D、that Irish farmers could address the twin problems of overpopulation and lack of food by eating their children
E、that Irish farmers, facing overpopulation and lacking food, could address the twin problems through eating their children
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3题:The cypress trees of the Louisiana wetlands are threatened by the exploding population of nutria, a type of SouthAmerican rodent introduced into the area in the 1930s in hopes of starting a nutria fur industry. Unfortunately, no one wanted the fur, and now the rodents number in the millions.
A、park ranger has suggested introducing the SouthAmerican jaguar, the nutria’s natural predator, into the Louisiana wetlands as a way to control the nutria population. Which of the following, if true, casts the most doubt on the ranger’s plan to introduce jaguars as an effective way to control the nutria population

A、Past attempts to control the nutria population through traps and poison have resulted in limited and temporary population reductions.
B、
A、program in Florida found that the best way to conserve the root systems of wetland trees such as cypresses is to surround the trees’ roots with tough plastic barriers.
C、The jaguar is a large and deadly predator that, if introduced, could kill livestock, pets, or even humans that it encounters in the Louisiana wetlands.
D、During the past year an unusually cold winter killed an estimated 35 percent of the nutria population in the Louisiana wetlands.
E、The SouthAmerican jaguar is a predator of the ferret, which is currently the chief predator of the nutria in the Louisiana wetlands.
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4题:The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether
A、Statement (1)ALONE、is sufficient, but statement (2) alone is not sufficient.
B、Statement (2)ALONE、is sufficient, but statement (1) alone is not sufficient.
C、BOTH statements TOGETHER are sufficient, but NEITHER statementALONE、is sufficient.
D、EACH statementALONE、is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
In the xy plane, is the point (4, -2) on the line l
(1) Point (1, 1) is on line l.
(2) The equation x=2-y describes line l.
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5题:The questions in this group are based on the content of a passage.After reading the passage, choose the best answer to each question.Answer all questions following the passage on the basis of what is stated or implied in the passage.
Pretty much everybody agrees that clean air is a good thing, rightEvidently not so. Since the 1960s, when people started talking about clean air in the first place, theAmerican energy industry, which includes coal companies, oil companies, and utility companies, has dragged its heels on every initiative to improve the quality of the air we breathe.Even after theCleanAirAct of 1970 and its amendments in 1977 and 1990 made it clear that controlling air pollution is a national priority, these companies have found tricks and loopholes to avoid compliance.
Perhaps the most egregious loophole is the one that allows older power plants to disregard limits on sulfux dioxide emissions until they undergo a major renovation, at which point they have to comply. Sulfur dioxide from coal-burning power plants is the primary cause of acid rain in NorthAmericA、TheCleanAirAct states that when coal-burning power plants upgrade their equipment, they must then comply with sulfur dioxide limitations by either installing scrubbing equipment that cleans the emissions or using fuel with lower sulfur content. The law tied the timing of compliance to major renovations in order to give power plants a grace period in which to comply. Many power plants, however, have exploited a loophole in this law by instituting a series of "minor" renovations that, in effect, upgrade their equipment without requiring them to comply with theCleanAirAct. Some plants have cheated the system by undergoing "minor" renovations for decades.
The power companies claim that they have to resort to these underhanded measures because the cost of compliance with theCleanAirAct is too high.And if everyone else is cheating the system, why should they have to install costly sulfur dioxide scrubbers
This cost argument falls apart upon scrutiny. Since 1977, more than 400 power plants across the country have managed to comply with the restrictions and are still making money. The sulfur dioxide scrubbing equipment has turned out to be far less expensive than the power industry naysayers claimed it would be. Many power plants have even complied with the emissions limits and reduced their operating costs by switching from high-sulfurAppalachian coal to the low-sulfur coal produced in western states such as Wyoming and Idaho. Western coal is not only cleaner than eastern coal, but also, because it is generally closer to the surface, as much as 30 percent less expensive to extract.
Clearly, the costs of compliance with theCleanAirAct can be justified, but if these companies were honest, such justifications would not have to be made. If they were honest, they would acknowledge the costs of not complying: the health costs of increased rates of asthma and lung cancer in high-emissions areas; the environmental costs of acid-scarred forests and lakes; the aesthetic costs of a haze of sulfur dioxide cutting visibility across the eastern United States to only half of what it was in pre-industrial times. When you look at the true costs you have to ask, is any cost too high for clean air
In the fourth paragraph, the passage mentions the "400 power plants" for what purpose
A、To provide concrete evidence that many power plants have complied with theCleanAirAct provisions without undergoing ruinous financial hardship
B、To demonstrate the size and influence of the energy industry in the United States
C、To demonstrate that only a fraction of the power plants in the country have complied with theCleanAirAct, while hundreds of others have avoided compliance through tricks and loopholes
D、To demonstrate that companies can both comply wit
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6题:某人以6公里/小时的平均速度上山。上山后立即以12公里/小时的平均速度原路返回.那么此人在往返过程中每小时平均所走的公里数为().
A.9
B、8
C、7
D、6
E、5
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7题:The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether
A、Statement (1)ALONE、is sufficient, but statement (2) alone is not sufficient.
B、Statement (2)ALONE、is sufficient, but statement (1) alone is not sufficient.
C、BOTH statements TOGETHER are sufficient, but NEITHER statementALONE、is sufficient.
D、EACH statementALONE、is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
What is the value of n
(1) n4=256
(2) n3>n2
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8题:In a sample of patients at an animal hospital, 30 percent are cats and 60 percent are not dogs. What fraction of those patients who are not cats are dogs

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9题:The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether
A、Statement (1)ALONE、is sufficient, but statement (2) alone is not sufficient.
B、Statement (2)ALONE、is sufficient, but statement (1) alone is not sufficient.
C、BOTH statements TOGETHER are sufficient, but NEITHER statementALONE、is sufficient.
D、EACH statementALONE、is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
An employee at a company was given the task of making a large number of copies. He spent the first 45 minutes making copies at a constant rate on copierA, but copierA、broke down before the task was completeD、He then spent the next 30 minutes finishing the task on copierB, which also produced copies at a constant rate. How many total minutes would the task have taken had copierA、not broken down
(1)CopierA、produced twice as many copies in its first 5 minutes of operation as copierB、produced in its first 15 minutes.
(2)CopierB、produces 10 copies per minute.
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10题:Incomeinasingleyearisaverypoorguidetoincomeandwealthoverevenafewyears,muchlessalifetime;inthelongerrun,ataxonwhatpeoplespendisthereforenotmuchdifferentthanataxontheirincome.()
(A)thanataxontheirincome
(B)fromataxonwhattheyearn
(C)thantaxingincome
(D)fromtheincometax
(E)thanataxonwhatpeopleearn
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