问答

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 discovery of which of the following would call into question the conclusion mentioned in line 16?

选项:

A、An asteroid 100 meters in diameter rotating at a rate of once per week
B、An asteroid 150 meters in diameter rotating at a rate of 20 times per hour
C、An asteroid 250 meters in diameter rotating at a rate of once per week
D、An asteroid 500 meters in diameter rotating at a rate of once per hour
E、An asteroid 1,000 meters in diameter rotating at a rate of once every 24 hours

答案:

D
1答疑

[Data Sufficiency]

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题目：

Is the sum of p2 and q2 greater than 1?
(1)   p is greater than 1/2.
(2) q is greater than 1/2.

选项:

答案:

E
1答疑

[Sentence Correction]

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题目：

The type of behavior exhibited when an animal recognizes itself in a mirror comes within the domain of “theory of mind,” thus is best studied as part of the field of animal cognition.

选项:

A、
A. of “theory of mind,” thus is best
B、
B. “theory of mind,” and so is best to be
C、
C. of a “theory of mind,” thus it is best
D、
D. of “theory of mind” and thus is best
E、
E. of the “theory of mind,” and so it is best to be

答案:

D
1答疑

[Critical Reasoning]

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文章：

The amount of time it takes for most of a worker’s occupational knowledge and skills to become obsolete has been declining because of the introduction of advanced manufacturing technology (AMT). Given the rate at which AMT is currently being introduced in manufacturing, the average worker’s old skills become obsolete and new skills are required within as little as five years.

题目：

Which of the following plans, if feasible, would allow a company to prepare most effectively for the rapid obsolescence of skills described above?

选项:

A、The company will develop a program to offer selected employees the opportunity to receive training six years after they were originally hired. The company will increase its investment in AMT every year for a period of at least five years
B、The company will periodically survey its employees to determine how the introduction of AMT has affected them
C、Before the introduction of AMT, the company will institute an educational program to inform its employees of the probable consequences of the introduction of AMT
D、The company will ensure that it can offer its employees any training necessary for meeting their job requirements

答案:

E
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[Sentence Correction]

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题目：

An exceptionally literate people, more Icelanders publish books per capita than do the people of any other nation.

选项:

A、more Icelanders publish books per capita than do the people of 
B、more Icelandic books are published by Icelanders per capita than by the people of 
C、Icelanders publish more books per capita than do the people of 
D、Iceland's per capita publication of books is higher than that by 
E、the per capita publication of Icelandic books is higher than that in

答案:

C
1答疑

[Data Sufficiency]

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题目：

A conveyor belt moves bottles at a constant speed of 120 centimeters per second. If the conveyor belt moves a bottle from a loading dock to an unloading dock, is the distance that the conveyor belt moves the bottle less than 90 meters? (1 meter = 100 centimeters)
  1. It takes the conveyor belt less than 1.2 minutes to move the bottle from the loading dock to the unloading dock.
  2. It takes the conveyor belt more than 1.1 minutes to move the bottle from the loading dock to the unloading dock.

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 statements 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:

A
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[Data Sufficiency]

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题目：

The cardinality of a finite set is the number of elements in the set. What is the cardinality of set A ?
  1. 2 is the cardinality of exactly 6 subsets of set A.
  2. Set A has a total of 16 subsets, including the empty set and set A itself.

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 statements 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:

D
1答疑

[Reading Comprehension]

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文章：

Line In addition to conventional galaxies, the universe
contains very dim galaxies that until recently went
unnoticed by astronomers. Possibly as numerous
as conventional galaxies, these galaxies have the
(5) same general shape and even the same
approximate number of stars as a common type of
conventional galaxy, the spiral, but tend to be much
larger. Because these galaxies’ mass is spread out
over larger areas, they have far fewer stars per unit
(10) volume than do conventional galaxies. Apparently
these low-surface-brightness galaxies, as they are
called, take much longer than conventional galaxies
to condense their primordial gas and convert it to
stars—that is, they evolve much more slowly.
(15) These galaxies may constitute an answer to the
long-standing puzzle of the missing baryonic mass
in the universe. Baryons—subatomic particles that
are generally protons or neutrons—are the source
of stellar, and therefore galactic, luminosity, and so
(20) their numbers can be estimated based on how
luminous galaxies are. However, the amount of
helium in the universe, as measured by
spectroscopy, suggests that there are far more
baryons in the universe than estimates based on
(25) galactic luminosity indicate. Astronomers have long
speculated that the missing baryonic mass might
eventually be discovered in intergalactic space or as
some large population of galaxies that are
difficult to detect.

题目：

It can be inferred from the passage that which of the following is an accurate physical description of typical low-surface-brightness galaxies?

选项:

A、
They are large spiral galaxies containing fewer stars than conventional galaxies.
B、
They are compact but very dim spiral galaxies.
C、
They are diffuse spiral galaxies that occupy a large volume of space.
D、
They are small, young spiral galaxies that contain a high proportion of primordial gas.
E、
They are large, dense spirals with low luminosity.

答案:

C
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[Data Sufficiency]

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题目：

If a certain animated cartoon consists of a total of 17,280 frames on film, how many minutes will it take to run the cartoon?

(1)The cartoon runs without interruption at the rate of 24 frames per second.

(2)It takes 6 times as long to run the cartoon as it takes to rewind the film, and it takes a total of 14 minutes to do both.

选项:

答案:

D
1答疑

[Sentence Correction]

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题目：

According to its proponents, a proposed new style of aircraft could, by
skinning along the top of the atmosphere, fly between most points on
Earth in under two hours.

选项:

A、According to its proponents, a proposed new style of aircraft could,by skimming along the top of the atmosphere, fly between most points on earth in under two hours.
B、By skimming along the top of the atmosphere, proponents of a pro-posed new style of aircraft say it could fly between most points on earth in under two hours.
C、A proposed new style of aircraft could fly between most points onearth in under two hours, according to kits proponents, with kit skim-ming along the top of the atmosphere.
D、A proposed new style of aircraft, say its proponents, could fly between most points on earth in under two hours because of it is skimming along the top of the atmosphere..
E、According to its proponents, skinning along the top of the atmo-sphere makes it possible that a proposed new style of aircraft could fly between most points on earth in under two hours.

答案:

A
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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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[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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