问答

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[Problem Solving]

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题目：

If a code word is defined to be a sequence of different letters chosen from the 10 letters A, B, C, D, E, F, G, H, I, and J, what is the ratio of the number of 5-letter code words to the number of 4-letter code words?

选项:

A、5 to 4
B、3 to 2
C、2 to 1
D、5 to 1
E、6 to 1

答案:

E
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[Sentence Correction]

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题目：

The Swedish warship Vasa, sunk in 1628 and raised in 1961, was preserved in the cold water of Stockholm harbor, where low salinity inhibits the growth of marine borers that in most seas devour every exposed scrap of a sunken ship's wooden hull.

选项:

A、 was preserved in the cold water of Stockholm harbor, where low salinity inhibits
B、 being preserved in the cold water of Stockholm harbor, because the low salinity there is able to inhibit
C、 and preserved in the cold water of Stockholm harbor, the low salinity there inhibits
D、 having been preserved in the cold water of Stockholm harbor, whose low salinity inhibits
E、 had been preserved in the cold water of Stockholm harbor, because of low salinity there inhibiting

答案:

A
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[Critical Reasoning]

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题目：

In countries in which new life-sustaining drugs cannot be patented, such drugs are sold at widely affordable prices; those same drugs, where patented, command premium prices because the patents shield patent-holding manufacturers from competitors.  These facts show that future access to new life-sustaining drugs can be improved if the practice of granting patents on newly developed life-sustaining drugs were to be abolished everywhere.
 
Which of the following, if true, most seriously weakens the argument?

选项:

A、In countries in which life-sustaining drugs cannot be patented, their manufacture is nevertheless a profitable enterprise.
B、Countries that do not currently grant patents on life-sustaining drugs are, for the most part, countries with large populations.
C、In some countries specific processes for the manufacture of pharmaceutical drugs can be patented even in cases in which the drugs themselves cannot be patented.
D、Pharmaceutical companies can afford the research that goes into the development of new drugs only if patents allow them to earn high profits.
E、Countries that grant patents on life-sustaining drugs almost always ban their importation from countries that do not grant such patents.

答案:

D
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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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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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422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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1450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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[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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621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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1428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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674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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691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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