问答

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[Problem Solving]

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题目：

Right triangle PQR is to be constructed in the xy-plane so that the right angle is at P and is parallel to the x-axis. The x- and y-coordinates of P, Q, and R are to be integers that satisfy the inequalities-4 ≤ x≤ 5and 6≤y≤16. How many different triangles with these properties could be constructed?

选项:

A、110
B、1,100
C、9,900
D、10,000
E、12,100

答案:

C
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[Critical Reasoning]

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题目：

Economist: Tropicorp, which constantly seeks profitable investment opportunities, has been buying and clearing sections of tropical forest for cattle ranching, although pastures newly created there become useless for grazing after just a few years. The company has not gone into rubber tapping, even though greater profits can be made from rubber tapping, which leaves the forest intact. Thus, some environmentalists argue that Tropicorp's actions do not serve even its own economic interest. However, the initial investment required for a successful rubber-tapping operation is larger than that needed for a cattle ranch; there is a shortage of workers employable in rubber-tapping operations; and taxes are higher on profits from rubber tapping than on profits from cattle ranching. Consequently, the environmentalists' conclusion is probably wrong.

In the economist's argument, the two boldface portions play which of the following roles?

选项:

A、The first supports the conclusion of the economist's argument; the second calls that conclusion into question.
B、The first states the conclusion of the economist's argument; the second supports that conclusion.
C、The first supports the conclusion of the environmentalists' argument; the second states that conclusion.
D、The first states the conclusion of the environmentalists' argument; the second states the conclusion of the economist's argument.
E、Each supports the conclusion of the economist's argument.

答案:

D
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[Sentence Correction]

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题目：

Even though Clovis points, spear points with longitudinal grooves chipped onto
their faces, have been round all over north America ,they are named for the
new Mexico site where whey were first discovered in 1932

选项:

A、Even though Clovis points , spear points with longitudinal grooves chipped onto their faces, have been found all over north America, they are named for the new Mexico site where they were first discovered in 1932.
B、Although named for the new Mexico site where fist discovered in 1932. Clovis points are spear points of longitudinal grooves chipped onto their faces and have been found all over north America .
C、Named for the new Mexico site where they have been first discovered in 1932, Clovis points, spear points of longitudinal grooves chipped onto the faces, have been found all over north America .
D、Spear points with longitudinal grooves that are chipped onto the faces ,Clovis  points , even though named for the new Mexico site where first discovered in 1932, but were found all over north America .
E、While Clovis points are spear points whose faces have longitudinal grooves chipped into them ,they have been found all over north America ,and named for the new Mexico site where they have been first discovered in 1932 

答案:

A
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[Problem Solving]

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题目：

A tank contains 10,000 gallons of a solution that is 5 percent sodium chloride by volume. If 2,500 gallons of water evaporate from the tank, the remaining solution will be approximately what percent sodium chloride?

选项:

A、1.25%
B、3.75%
C、6.25%
D、6.67%
E、11.7%

答案:

D
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[Data Sufficiency]

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题目：

If x and y are integers, is xy + 1 divisible by 3 ?
  1. When x is divided by 3, the remainder is 1.
  2. When y is divided by 9, the remainder is 8.

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:

C
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[Critical Reasoning]

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题目：

The ancient Nubians inhabited an area in which typhus occurred, yet surprisingly few of their skeletons show the usual evidence of this disease. The skeletons do show deposits of tetracycline, an antibiotic produced by a bacterium common in Nubian soil. This bacterium can flourish on the dried grain used for making two staples of the Nubian diet, beer and bread. Thus, tetracycline in their food probably explains the low incidence of typhus among ancient Nubians.

Which of the following is an assumption on which the argument relies?

选项:

A、The tetracycline deposits did not form after the bodies were buried.
B、The diseases other than typhus to which the ancient Nubians were exposed would not be affected by tetracycline.
C、Typhus is generally fatal.
D、Nubian grain became contaminated with tetracycline-producing bacteria prior to being harvested.
E、Bread and beer were the only foods eaten by the ancient Nubians which could have contained tetracycline.

答案:

A
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[Problem Solving]

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题目：

A thin piece of wire 40 meters long is cut into two pieces.  One piece is used to form a circle with radius r, and the other is used to form a square.  No wire is left over.  Which of the following represents the total area, in square meters, of the circular and the square regions in terms of r?

选项:

A、πr2
B、πr2+ 10
C、πr2+ 1/4π2r2
D、πr2 + (40-2πr)2
E、πr2 + (10- 1/2 πr)2

答案:

E
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[Sentence Correction]

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题目：

Hydrocarbons, with which fruit flies perfume themselves in species-specific blends, are known to be important in courtship, and apparently this assists flies that taste the hydrocarbons on prospective mates to distinguish their own species from that of others

选项:

A、and apparently this assists flies that taste the hydrocarbons on prospective mates to distinguish their own species from that of
B、 and apparently this assists flies when they taste the hydrocarbons on prospective mates in distinguishing their own species from those of
C、 which apparently assists flies that taste the hydrocarbons on prospective mates in being able to distinguish their own species from
D、 apparently assisting flies to taste the hydrocarbons on prospective mates to distinguish their own species from those of
E、 apparently assisting flies that taste the hydrocarbons on prospective mates in distinguishing their own species from

答案:

E
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[Problem Solving]

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题目：

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?

选项:

A、1
B、2
C、3
D、4
E、5

答案:

E
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[Data Sufficiency]

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题目：

If each of the 8 employees working on a certain project received an award, was the amount of each award the same?
(1)   The standard deviation of the amounts of the 8 awards was 0.
(2)   The total amount of the 8 awards was $10,000.

选项:

答案:

A
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1156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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3293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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3642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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1212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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2778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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1903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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1221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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1287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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304731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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311857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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