问答

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[Sentence Correction]

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题目：

When drive-ins were at the height of their popularity in the late 1950's, some 4,000 existed in the United States, but today there are less than one-quarter that many.

选项:

A、there are less than one-quarter that many
B、there are fewer than one-quarter as many
C、there are fewer than one-quarter of that amount
D、the number is less than one-quarter the amount
E、it is less than one-quarter of that amount

答案:

B
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[Problem Solving]

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题目：

The sum of the first k positive integers is equal to $$frac{k(k+1)}{2}$$. What is the sum of the integers from n to m, inclusive, where $$0<{n}<{m}$$?

选项:

A、 $$\frac{m(m+1)}{2}-\frac{({n}+{1})({n}+{2})}{2}$$
B、 $$\frac{m(m+1)}{2}-\frac{(n-1)n}{2}$$
C、 $$\frac{m(m+1)}{2}-\frac{(n+1)(n+2)}{2}$$
D、 $$\frac{(m-1)m}{2}-\frac{(n+1)(n+2)}{2}$$
E、 $$\frac{(m-1)m}{2}-\frac{n(n+1)}{2}$$

答案:

B
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[Sentence Correction]

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题目：

Whereas high speeds generally cannot be achieved by ramjets without their initially being assisted by a rocket, a scramjet, or supersonic combustion ramjet, can attain high speeds by reducing airflow compression at the entrance of the engine and letting air pass through at supersonic speeds.

选项:

A、Whereas high speeds generally cannot be achieved by ramjets without their initially being assisted by
B、Whereas a ramjet generally cannot achieve high speeds without the initial assistance of
C、With ramjets, high speeds generally are not able to be achieved without initially being assisted by
D、Unlike with ramjets, generally unable to achieve high speeds without the initial assistance of
E、Although a ramjet generally does not have the capability of achieving high speeds without the initial assistance from

答案:

B
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[Sentence Correction]

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题目：

The treasury market dropped in response to a decrease in the value of the dollar and to continued concern that the economy might be growing as fast as to accelerate inflation and drive interest rates higher.

选项:

A、
A. that the economy might be growing as fast as
B、
B. that the economy might be growing fast enough
C、
C. with the economy's possibly growing so fast as
D、
D. with the possibility of the economy growing fast enough so as
E、
E. with the possibility of the economy possibly growing fast enough

答案:

B
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[Data Sufficiency]

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题目：

if p, s, and t are positive prime numbers, what is the value of p^3s^3t^3?
(1) p^3st=728
(2) t=13

选项:

答案:

A
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[Critical Reasoning]

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题目：

More and more law firms specializing in corporate taxes are paid on a contingency-fee basis. Under this arrangement, if a case is won, the firm usually receives more than it would have received if it had been paid on the alternate hourly rate basis. If the case is lost, the firm receives nothing. Most firms are likely to make more under the contingency-fee arrangement.

Which of the following, if true, would most strengthen the prediction above?

选项:

A、Firms that work exclusively under the hourly rate arrangement spend, on average, fewer hours on cases that are won than on cases that are lost.
B、Some litigation can last for years before any decision is reached, and, even then, the decision may be appealed.
C、Firms under the contingency-fee arrangement still pay their employees on an hourly basis.
D、Since the majority of firms specialize in certain kinds of cases, they are able to assess accurately their chances of winning each potential case.
E、Firms working under the contingency-fee arrangement take in fewer cases per year than do firms working under the hourly rate arrangement.

答案:

D
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[Critical Reasoning]

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题目：

Outsourcing is the practice of obtaining from an independent supplier a product or service that a company has previously provided for itself.  Vernon, Inc., a small manufacturing company that has in recent years experienced a decline in its profits, plans to boost its profits by outsourcing those parts of its business that independent suppliers can provide at lower cost than Vernon can itself.
 
Which of the following, if true, most strongly supports the prediction that Vernon's plan will achieve its goal?

选项:

A、Among the parts of its business that Vernon does not plan to outsource are some that require standards of accuracy too high for most independent suppliers to provide at lower cost than Vernon can.
B、Vernon itself acts as an independent supplier of specialized hardware items to certain manufacturers that formerly made those items themselves.
C、Relatively few manufacturers that start as independent suppliers have been able to expand their business and become direct competitors of the companies they once supplied.
D、Vernon plans to select the independent suppliers it will use on the basis of submitted bids.
E、Attending to certain tasks that Vernon performs relatively inefficiently has taken up much of the time and effort of top managers whose time would have been better spent attending to Vernon's core business.

答案:

E
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[Critical Reasoning]

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题目：

Since 1978 when the copyright law was changed, books that are less than fifty years old must not be photocopied without the publisher’s permission. Thus, any book that has been photocopied since 1978 without the publisher’s permission must be at least fifty years old.

The reasoning above exhibits a flaw similar to one in which of the following?

选项:

A、Any member of the solar system must be either a planet or a moon, so if an asteroid is neither a planet nor a moon, it must not be a member of the solar system.
B、Anyone who rides a city bus must buy a bus pass, and since Demetrios has a bus pass, he must be riding on a city bus.
C、A driver who turns right must signal, so any driver who did not signal must not have turned right.
D、Anyone who legally crosses a national boundary must have a passport; thus anyone who does not have a passport cannot legally cross a national boundary.
E、Any wage earner residing in the state must pay state taxes, so since Blodwen pays state taxes, she must be resident in the state.

答案:

C
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[Sentence Correction]

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题目：

Because of a similarity to dance, synchronized swimming—exhibition swimming in which the movements of one or more swimmers synchronize to a musical accompaniment—is sometimes called water ballet, especially in theatrical situations.i

选项:

A、of one or more swimmers synchronize to
B、of one swimmer or more is synchronized with
C、of one or more swimmers are synchronized with
D、by one swimmer or more is synchronized to
E、by one or more swimmers synchronize to

答案:

C
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[Critical Reasoning]

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题目：

Researchers have found that when very overweight people, who tend to have relatively low metabolic rates, lose weight primarily through dieting, their metabolisms generally remain unchanged.  They will thus burn significantly fewer calories at the new weight than do people whose weight is normally at that level.  Such newly thin persons will, therefore, ultimately regain weight until their body size again matches their metabolic rate.
The conclusion of the argument above depends on which of the following assumptions?

选项:

A、Relatively few very overweight people who have dieted down to a new weight tend to continue to consume substantially fewer calories than do people whose normal weight is at that level.
B、The metabolisms of people who are usually not overweight are much more able to vary than the metabolisms of people who have been very overweight.
C、The amount of calories that a person usually burns in a day is determined more by the amount that is consumed that day than by the current weight of the individual.
D、Researchers have not yet determined whether the metabolic rates of formerly very overweight individuals can be accelerated by means of chemical agents.
E、Because of the constancy of their metabolic rates, people who are at their usual weight normally have as much difficulty gaining weight as they do losing it.

答案:

A
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1917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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4981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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5682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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1900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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4115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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2877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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1903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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1993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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425254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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432391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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