问答

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[Sentence Correction]

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题目：

Until Berta and Ernst Scharrer established the concept of neurosecretion in 1928, scientists believed that either cells secreted hormones, which made them endocrine cells and thus part of the endocrine system, or conducted electrical impulses, in which case they were nerve cells and thus part of the nervous system.

选项:

A、 either cells secreted hormones, which made them
B、 either cells secreted hormones, making them
C、 either cells secreted hormones and were
D、 cells either secreted hormones, in which case they were
E、 cells either secreted hormones, which made them

答案:

D
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[Data Sufficiency]

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题目：

If x and y are positive integers such that x = 8y + 12, what is the greatest common divisor of x and y ?
(1)x = 12u, where u is an integer.
(2)y = 12z, where z is an integer.

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:

B
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[Critical Reasoning]

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文章：

When there is less rainfall than normal, the water level of Australian rivers falls and the rivers fl ow more slowly. Because algae whose habitat is river water grow best in slow-moving water, the amount of algae per unit of water generally increases when there has been little rain. By contrast, however, following a period of extreme drought, algae levels are low even in very slow-moving river water.

题目：

Which of the following, if true, does most to explain the contrast described above?

选项:

A、During periods of extreme drought, the populations of some of the species that feed on algae tend to fall. The more slowly water moves, the more conducive its temperature is to the growth of algae
B、When algae populations reach very high levels, conditions within the river can become toxic for some of the other species that normally live there. 
C、Australian rivers dry up completely for short intervals in periods of extreme drought
D、Except during periods of extreme drought, algae levels tend to be higher in rivers in which the fl ow has been controlled by damming than in rivers that fl ow freely.

答案:

D
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[Data Sufficiency]

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题目：

In triangle ABC, point X  is the midpoint of side AC  and point Y  is the midpoint of side BC . If point R  is the midpoint of line segment XC  and if point S  is the midpoint of line segment YC , what is the area of triangular region RCS  ?
(1)   The area of triangular region ABX  is 32.
(2)   The length of one of the altitudes of triangle ABC  is 8.

选项:

答案:

A
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[Sentence Correction]

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题目：

The Supreme Court has ruled that public universities can collect student activity fees even with students’ objections to particular activities, so long as the groups they give money to will be chosen without regard to their views.

选项:

A、with students’ objections to particular activities, so long as the groups they give money to will be
B、if they have objections to particular activities and the groups that are given the money are
C、if they object to particular activities, but the groups that the money is given to have to be
D、from students who object to particular activities, so long as the groups given money are
E、though students have an objection to particular activities, but the groups that are given the money be

答案:

D
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[Problem Solving]

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题目：

The figure above represents a square garden that is divided into 9 rectangular regions with indicated dimensions in meters.  The shaded regions are planted with peas, and the unshaded regions are planted with tomatoes.  If the sum of the areas of the regions planted with peas is equal to the sum of the areas of the regions planted with tomatoes, what is the value of x?

选项:

A、0.5
B、1
C、1.5
D、2
E、2.5

答案:

C
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[Sentence Correction]

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题目：

Indoor air pollution can threaten the health of closely confined farm animals and the workers who tend them and perhaps as well impairs the quality of such farm products like eggs, poultry, and pork.

选项:

A、perhaps as well impairs the quality of such farm products like
B、perhaps as well impairs the quality of such farm products as
C、perhaps also impairs the quality of such farm products like
D、may also impair the quality of such farm products like
E、may also impair the quality of such farm products as

答案:

E
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[Critical Reasoning]

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题目：

Situation:  For five years the Souper restaurant chain has maintained rapid sales growth in Danport, primarily by opening new restaurants that draw patrons away from other restaurants in their vicinity.
 
Goal:  Souper wishes to achieve continued rapid sales growth in Danport over the next two years.
 
Proposal for consideration:  Continue to open new restaurants in Danport during the next two years at the same rate as in the last two years.
 
In light of the situation, which of the following, if true, most strongly argues that adopting the proposal would be an ineffective way of achieving the goal?

选项:

A、At times at which customers find Souper restaurants too crowded, they often go to other restaurants nearby.
B、The Souper chain has generally opened new restaurants in locations that are in the vicinity of a large number of other restaurants.
C、Souper restaurants generally offer a much smaller variety of foods than many of the other restaurants in their vicinity.
D、Virtually all potential sites for new Souper restaurants in Danport are located in the vicinity of existing Souper restaurants.
E、Souper restaurants have always offered meals that are somewhat less expensive than meals at restaurants that compete with Souper for patrons.

答案:

D
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[Data Sufficiency]

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题目：

Of the 66 people in a certain auditorium, at most 6 people have their birthdays in any one given month. Does at least one person in the auditorium have a birthday in January?
(1) More of the people in the auditorium have their birthday in February than in March.
(2) Five of the people in the auditorium have their birthday in March.

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
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[Data Sufficiency]

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题目：

Each week a certain salesman is made a fixed amount equal to $300 plus a commission equal to 5 percent of the amount of these sales that week over $1,000.  What is the total amount the salesman was paid last week?
(1)   The total amount the salesman was paid last week is equal to 10 percent of the amount of these sales last week.
(2)     The salesman's sales last week total $5,000.

选项:

答案:

D
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792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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2411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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2641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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923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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2117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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1459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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948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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984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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230403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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[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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