问答

1答疑

[Critical Reasoning]

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题目：

NorthAir charges low fares for its economy-class seats, but it provides very cramped seating and few amenities. Market research shows that economy passengers would willingly pay more for wider seating and better service, and additional revenue provided by these higher ticket prices would more than cover the additional cost of providing these amenities. Even though NorthAir is searching for ways to improve its profitability, it has decided not to make these improvements.

Which of the following, if true, would most help to explain NorthAir’s decision in light of its objectives?

选项:

A、None of NorthAir’s competitors offers significantly better seating and service to economy-class passengers than NorthAir does.
B、On many of the routes that NorthAir flies, it is the only airline to offer direct flights.
C、A few of NorthAir’s economy-class passengers are satisfied with the service they receive, given the low price they pay.
D、Very few people avoid flying on NorthAir because of the cramped seating and poor service offered in economy class.
E、The number of people who would be willing to pay the high fares NorthAir charges for its business-class seats would decrease if its economy-class seating were more acceptable.

答案:

E
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[Sentence Correction]

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题目：

The growth projected for these storms in different computerized weather models varies widely.

选项:

A、
A. projected for these storms in different computerized weather models varies widely
B、
B. for these storms is projected in different computerized models of weather to vary widely
C、
C. of these storms, projected in different computerized weather models, vary widely
D、
D. projected for these storms, which vary widely in different computerized weather models
E、
E. that varies widely for these storms are projected in different computerized weather models

答案:

A
1答疑

[Data Sufficiency]

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题目：

A scientist recorded the number of eggs in each of 10 birds' nests. What was the standard deviation of the numbers of eggs in the 10 nests?
(1)   The average (arithmetic mean) number of eggs for the 10 nests was 4.
(2)   Each of the 10 nests contained the same number of eggs.

选项:

答案:

B
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[Problem Solving]

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题目：

A researcher computed the mean, the median, and the standard deviation for a set of performance scores. If 5 were to be added to each score, which of these three statistics would change?

选项:

A、The mean only
B、The median only
C、The standard deviation only
D、The mean and the median
E、The mean and the standard deviation

答案:

D
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[Sentence Correction]

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题目：

As a pianist, composer, scholar, and essayist on a variety of learned subjects, among the most gifted and versatile musicians of his time was Camille Saint-Saens(1835-1921) who was, as many of his contemporaries were, deeply interested in Oriental themes.

选项:

A、As a pianist ,composer, scholar, and essayist on a variety of learned subjects, among the most gifted and versatile musicians of his time was Camille Saint-Saens (1835-1921) who was
B、As a pianist, composer, scholar, and essayist on a variety of earned subjects, Camille Saint-Saens (1835-1921) was among the most gifted and versatile Musicians of his time and having been
C、Pianist, composer, scholar, and essayist on a variety of learned subjects, among the most gifted and versatile musicians of his time was Camille Saint-Saens(1835-1921), and he was
D、Pianist, composer, scholar, and essayist on a variety of learned subjects, Camille Saint-Saens (1835-1921) was among the most gifted and versatile musicians of his time and was
E、Pianist, composer, scholar, and essayist on a variety of learned subjects, Camille Saint-Saens (1835-1921), who was, among the musicians of his time, one of the most gifted and versatile, had been

答案:

D
1答疑

[Reading Comprehension]

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文章：

Line When asteroids collide, some collisions cause
an asteroid to spin faster; others slow it down. If
asteroids are all monoliths—single rocks—undergoing
random collisions, a graph of their rotation rates
(5) should show a bell-shaped distribution with statistical
“tails” of very fast and very slow rotators. If asteroids
are rubble piles, however, the tail representing the
very fast rotators would be missing, because any
loose aggregate spinning faster than once every few
(10) hours (depending on the asteroid’s bulk density)
would fly apart. Researchers have discovered that
all but five observed asteroids obey a strict limit on
rate of rotation. The exceptions are all smaller than
200 meters in diameter, with an abrupt cutoff for
(15) asteroids larger than that.
The evident conclusion—that asteroids larger than
200 meters across are multicomponent structures or
rubble piles—agrees with recent computer modeling
of collisions, which also finds a transition at that
(20) diameter. A collision can blast a large asteroid to bits,
but after the collision those bits will usually move
slower than their mutual escape velocity. Over several
hours, gravity will reassemble all but the fastest
pieces into a rubble pile. Because collisions among
(25) asteroids are relatively frequent, most large bodies
have already suffered this fate. Conversely, most
small asteroids should be monolithic, because impact
fragments easily escape their feeble gravity.

题目：

The passage implies which of the following about the five asteroids mentioned in line 12?

选项:

A、Their rotation rates are approximately the same.
B、They have undergone approximately the same number of collisions.
C、They are monoliths.
D、They are composed of fragments that have escaped the gravity of larger asteroids.
E、They were detected only recently.

答案:

C
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[Problem Solving]

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题目：

 n is an integer between 1 and 84. What is the value of n?
(1) The square root of n is divisible by 5.
(2) n is both the square of an integer and the cube of an integer. 

选项:

A、Aif statement (1) ALONE is sufficient to answer the question but statement (2) alone is not sufficient;
B、Bif statement (2) ALONE is sufficient to answer the question but statement (1) alone is not sufficient;
C、Cif the two statements TAKEN TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient;
D、Dif EACH statement ALONE is sufficient to answer the question;
E、Eif the two statements TAKEN TOGETHER are still NOT sufficient to answer the question.

答案:

D
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[Problem Solving]

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题目：

The function f is defined by f(x) = √x – 10 for all positive numbers x. If u = f(t) for some positive numbers t and u.  What is t in terms of u?
⼼

选项:

A、√(u+10)
B、(√u + 10)2
C、√(u2+10)
D、(u + 10)2
E、(u2 + 10)2

答案:

D
1答疑

[Critical Reasoning]

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题目：

Budget constraints have made police officials consider reassigning a considerable number of officers from traffic enforcement to work on higher-priority, serious crimes. Reducing traffic enforcement for this reason would be counterproductive, however, in light of the tendency of criminals to use cars when engaged in the commission of serious crimes. An officer stopping a car for a traffic violation can make a search that turns up evidence of serious crime.

Which of the following, if true, most strengthens the argument given?

选项:

A、
A. An officer who stops a car containing evidence of the commission of a serious crime risks a violent confrontation, even if the vehicle was stopped only for a traffic violation.
B、
B. When the public becomes aware that traffic enforcement has lessened, it typically becomes lax in obeying traffic rules.
C、
C. Those willing to break the law to commit serious crimes are often in committing such crimes unwilling to observe what they regard as the lesser constraints of traffic law.
D、
D. The offenders committing serious crimes who would be caught because of traffic violations are not the same group of individuals as those who would be caught if the arresting officers were reassigned from traffic enforcement.
E、
E. The great majority of persons who are stopped by officers for traffic violations are not guilty of any serious crimes.

答案:

C
1答疑

[Data Sufficiency]

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题目：

What is the ratio of the average (arithmetic mean) height of students in class X to the average height of students in class Y?

(1)The average height of the students in class X is 120 centimeters.

(2)The average height of the students in class X and class Y combined is 126 centimeters.

选项:

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 statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D、 EACH statement ALONE is sufficient.
E、 Statements (1) and (2) TOGETHER are NOT sufficient.

答案:

E
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348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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1304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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1489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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[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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1330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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[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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643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
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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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