问答

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题目：

Since the 1930s aircraft manufacturers have tried to build airplanes with frictionless wings, shaped so smoothly and perfectly that the air passing over them would not become turbulent.

选项:

A、wings, shaped so smoothly and perfectly
B、wings, wings so smooth and so perfectly shaped
C、wings that are shaped so smooth and perfect
D、wings, shaped in such a smooth and perfect manner
E、wings, wings having been shaped smoothly and perfectly so

答案:

B
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题目：

In a plan to stop the erosion of East Coast beaches, the Army Corps of Engineers proposed building parallel to shore a breakwater of rocks that would rise six feet above the waterline and act as a buffer, so that it absorbs the energy of crashing waves and protecting the beaches.

选项:

A、act as a buffer, so that it absorbsact like a buffer so as to absorb
B、act as a buffer, absorbing
C、acting as a buffer, absorbing
D、acting like a buffer, absorb

答案:

C
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[Problem Solving]

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题目：

An illustration shows 3 vertical lines and 4 horizontal lines arranged as a grid. The vertical lines are labeled from left to right as follows: Avenue A, Avenue B, and Avenue C. The horizontal lines are labeled from top to bottom as follows: Fourth street, third street, second street, and, first street. The intersection point between the third vertical line labeled avenue C and the first horizontal line labeled Fourth Street is marked and labeled Y. The intersection point between the first vertical line labeled avenue A and the fourth horizontal line labeled first street is marked and labeled X.

Pat will walk from intersection X to intersection Y along a route that is confined to the square grid of four streets and three avenues shown in the map above. How many routes from X to Y can Pat take that have the minimum possible length?

选项:

A、Six
B、Eight
C、Ten
D、Fourteen
E、Sixteen

答案:

C
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题目：

Working simultaneously at their respective constant rates, Machines A and B produce 800 nails in x hours. Working alone at its constant rate, Machine A produces 800 nails in y hours. In terms of x and y, how many hours does it take Machine B, working alone at its constant rate, to produce 800 nails?

选项:

A、 $$\frac{x}{x+y}$$
B、 $$\frac{y}{x+y}$$
C、 $$\frac{xy}{x+y}$$
D、 $$\frac{xy}{x-y}$$
E、 $$\frac{xy}{y-x}$$

答案:

E
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[Data Sufficiency]

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题目：

The annual rent collected by a corporation from a certain building was x percent more in 1998 than in 1997 and y percent less in 1999 than in 1998. Was the annual rent collected by the corporation from the building more in 1999 than in 1997?

(1)$$x > y$$

(2)$$frac{xy} {100}<{x}-{y}$$

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:

B
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[Critical Reasoning]

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题目：

A successful coffee stand that serves the workers in a large office building plans to increase its profits by adding oatmeal—a hot cereal popular among the workers—to its menu. The manager says that oatmeal is “the ultimate convenience food” because it can be served by the cup, as coffee is; further, offering oatmeal will enable the stand to get into the breakfast business without making a large investment, because it does not require elaborate cooking equipment.

Which of the following would, if true, most strengthen the likelihood that the manager's plan will achieve its goal?

选项:

A、Some of the office building's businesses have recently begun providing free coffee to their employees.
B、The ingredients needed to make oatmeal are inexpensive and do not spoil easily the way many fresh breakfast foods typically sold at coffee stands do.
C、In order to offer more flexible schedules to their workers, several businesses in the office building will soon be expanding their hours.
D、Supermarket sales of oatmeal and other cereals slowed this year following large gains last year.
E、Oatmeal manufacturers have recently reduced their oatmeal offerings, which had included oatmeal in microwaveable cups and convenient cereal bars made with rolled oats.

答案:

B
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题目：

If $${n}={3}^{8}-{2}^{8}$$, which of the following is NOT a factor of n ?

选项:

A、 97
B、 65
C、 35
D、 13
E、 5

答案:

C
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[Data Sufficiency]

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题目：

Mary persuaded n friends to donate $500 each to her election campaign, and then each of these n friends persuaded n more people to donate $500 each to Mary's campaign.  If no one donated more than once and if there were no other donations, what was the value of n?
(1)     The first n people donated  of the total amount donated.
(2)     The total amount donated was $120,000.

选项:

答案:

D
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题目：

If n is a positive integer, which of the following is a possible value of |56 - 5n|?

选项:

A、7
B、9
C、12
D、15
E、20

答案:

B
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题目：

 Month Average Price per Dozen

 April

 May

 June

$1.26

$1.20

$1.08

The table above shows the average (arithmetic mean) price per dozen eggs sold in a certain store during three successive months. If as many dozen were sold in April as in May, and twice as many were sold in June as in April, what was the average price per dozen of the eggs sold over the three-month period?

选项:

A、$1.08
B、$1.10
C、$1.14
D、$1.16
E、$1.18

答案:

D
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1931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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5019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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5705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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1911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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4129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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2894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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1913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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2002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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426872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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434010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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