问答

3答疑

[Problem Solving]

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题目：

The probability that event M will not occur is 0.8 and the probability that event R will not occur is 0.6. If events M and R cannot both occur, which of the following is the probability that either event M or event R will occur?

选项:

A、
B、
C、
D、
E、

答案:

C
3答疑

[Data Sufficiency]

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题目：

If M is a positive integer, then M^3 has how many digits?
(1) M has 3 digits.
(2) M^2 has 5 digits

选项:

答案:

E
3答疑

[Data Sufficiency]

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题目：

In the sequence of nonzero numbers t1, t2, t3, …, tn, …, tn+1 = tn / 2 for all positive integers n.  What is the value of t5?
(1)     t3 = 1/4
(2)     t1 - t5 = 15/16
v

选项:

答案:

D
3答疑

[Critical Reasoning]

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题目：

Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg.  If they laid too many eggs in a host egg, the developing wasp larvae would compete with each other to the death for nutrients and space.  If too few eggs were laid, portions of the host egg would decay, killing the wasp larvae.
 
Which of the following conclusions can properly be drawn from the information above?

选项:

A、The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp's egg-laying behavior.
B、Host insects lack any effective defenses against the form of predation practiced by parasitic wasps.
C、Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species.
D、Failure to lay enough eggs would lead to the death of the developing wasp larvae more quickly than would laying too many eggs.
E、Parasitic wasps use visual clues to calculate the size of a host egg.

答案:

A
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[Problem Solving]

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题目：

To be eligible for retirement benefits at the Omega Corporation, the sum of an employee's age, in years, and the number of years of employment must be at least 70. If x , where , is a certain employee's age when hired and y  is the minimum number of years of employment required for the employee to be eligible for retirement benefits, which of the following equations represents the relationship between x  and y  ?

选项:

A、xy = 70
B、x + y = 70
C、2x + y = 70
D、x + 2y = 70
E、2x + 2y = 70

答案:

D
3答疑

[Sentence Correction]

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题目：

Currently 26 billion barrels a year, world consumption of oil is rising at a rate of 2 percent annually.

选项:

A、world consumption of oil is rising at a rate of
B、the world is consuming oil at an increasing rate of
C、the world's oil is being consumed at the increasing rate of
D、the rise in the rate of the world's oil consumption is
E、oil is consumed by the world at an increasing rate of

答案:

A
3答疑

[Sentence Correction]

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题目：

The direction in which the Earth and the other solid planets--Mercury, Venus, and Mars--spins were determined from collisions with giant celestial bodies in the early history of the Solar System.

选项:

A、spins were determined from
B、spins were determined because of
C、spins was determined through
D、spin was determined by
E、spin was determined as a result of

答案:

D
3答疑

[Sentence Correction]

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题目：

The stars, some of them at tremendous speeds, are in motion just as the planets are, yet being so far away from Earth that their apparent positions in the sky do not change enough for their movement to be observed during a single human lifetime.

选项:

A、The stars, some of them at tremendous speeds, are in motion just as the planets are, yet being
B、Like the planets, the stars are in motion, some of them at tremendous speeds, but they are
C、Although like the planets the stars are in motion, some of them at tremendous speeds, yet
D、As the planets, the stars are in motion, some of them at tremendous speeds, but they are
E、The stars are in motion like the planets, some of which at tremendous speeds are in motion but

答案:

B
3答疑

[Critical Reasoning]

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题目：

Politician: Hybrid cars use significantly less fuel per kilometer than nonhybrids. And fuel produces air pollution, which contributes to a number of environmental problems. Motorists can save money by driving cars that are more fuel efficient, and they will be encouraged to drive hybrid cars if we make them aware of that fact. Therefore, we can help reduce the total amount of pollution emitted by cars in this country by highlighting this advantage of hybrid cars.

Which of the following, if true, would most indicate a vulnerability of the politician’s argument?

选项:

A、People with more fuel-efficient cars typically drive more than do those with less fuel-efficient cars.
B、Not all air pollution originates from automobiles.
C、Hybrid cars have already begun to gain popularity.
D、Fuel-efficient alternatives to hybrid cars will likely become available in the future.
E、The future cost of gasoline and other fuel cannot be predicted with absolute precision or certainty.

答案:

A
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[Sentence Correction]

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题目：

As an actress and, more importantly, as a teacher of acting, Stella Adler was one of the most influential artists in the American theater, who trained several generations of actors including Marlon Brando and Robert De Niro.

选项:

A、Stella Adler was one of the most influential artists in the American theater, who trained several generations of actors including
B、Stella Adler, one of the most influential artists in the American theater, trained several generations of actors who include
C、Stella Adler was one of the most influential artists in the American theater, training several generations of actors whose ranks included
D、one of the most influential artists in the American theater was Stella Adler, who trained several generations of actors including
E、one of the most influential artists in the American theater, Stella Adler, trained several generations of actors whose ranks included

答案:

C
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1917浏览

[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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4980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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5644浏览

[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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1898浏览

[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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4114浏览

[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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2871浏览

[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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1903浏览

[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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1993浏览

[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
0评分
424892浏览

[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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432029浏览

[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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