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题目：

In ancient Mesopotamia, prior to 2900 B.C., wheat was cultivated in considerable quantities, but After 2900B.C., production of that grain began to decline as the production of barely increased sharply.Some historians who study ancient Mesopotamia content that the decline in wheat production was due to excessive irrigation, lack of drainage, and the consequent accumulation of salt residues in the soil.
 
Which one of the following, if true, most help to support the historian's contention concerning the reasons for the decline in wheat production in ancient Mesopotamia?

选项:

A、The cultivation of barely requires considerably less water than does the cultivation of wheat.
B、Barely has much greater resistance to the presence of salt in soil ant does wheat.
C、Prior to 2900 B.C., barely was cultivated along with wheat, but the amount of barely produced was far less than the amount of wheat blights.
D、Around 2900 B.C., a series of wheat blights occurred, destroying much of the wheat crop year after year.
E、Literary and archaeological evidence indicates that in the period following 2900B.C., barely became the principal grain in the diet of most of the inhabitants of Mesopotamia.

答案:

B
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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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[Problem Solving]

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题目：

The graph above shows the combined revenue, in billions of dollars, of a chain of food stores for each year over a four-year period. In 1994 a certain store's revenue accounted for 2.0 percent of the combined revenue for that year, and in the 1995 the same store accounted for 2.3 percent of the combined revenue for that year. What was the approximate percent increase in revenue for this store from 1994 to 1995 ?

选项:

A、0.3%
B、15.0%
C、25.0%
D、30.4%
E、43.8%

答案:

E
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[Critical Reasoning]

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题目：

Although the earliest surviving Greek inscriptions written in an alphabet date from the eighth century B.C., a strong case can be made that the Greeks actually adopted alphabetic writing at least two centuries earlier.  Significantly, the text of these earliest surviving Greek inscriptions sometimes runs from right to left and sometimes from left to right.  Now, the Greeks learned alphabetic writing from the Phoenicians, and in the process they would surely have adopted whatever convention the Phoenicians were then using with respect to the direction of writing.  Originally, Phoenician writing ran in either direction, but by the eighth century B.C. it had been consistently written from right to left for about two centuries.
 
In the argument given, the two portions in boldface play which of the following roles?

选项:

A、The first is the position that the argument seeks to establish; the second reports a discovery that has been used to support a position that the argument opposes.
B、The first is the position that the argument seeks to establish; the second presents an assumption on which the argument relies.
C、The first presents evidence that is used in support of the position that the argument seeks to establish; the second presents an assumption on which the argument relies.
D、The first is an objection raised against a position that the argument opposes; the second is the position that the argument seeks to establish.
E、The first is an objection raised against a position that the argument opposes; the second is evidence that has been used to support that position.

答案:

B
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题目：

In contrast to some fish eggs requiring months to incubate, the Rio Grande silvery minnow produces eggs that hatch in about 24 hours, yielding larvae that can swim in just three to four days.

选项:

A、 some fish eggs requiring months to incubate
B、 some fish, whose eggs require months to incubate
C、 some fish that have eggs requiring months to incubate
D、 the requirement of months of incubation for some fish eggs
E、 requiring months of incubation, as some fish eggs do

答案:

B
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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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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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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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题目：

Early in the twentieth century, Lake Konfa became very polluted.  Recently fish populations have recovered as release of industrial pollutants has declined and the lake's waters have become cleaner.  Fears are now being voiced that the planned construction of an oil pipeline across the lake's bottom might revive pollution and cause the fish population to decline again.  However, a technology for preventing leaks is being installed.  Therefore, provided this technology is effective, those fears are groundless.
 
The argument depends on assuming which of the following?

选项:

A、Apart from development related to the pipeline, there will be no new industrial development around the lake that will create renewed pollution in its waters.
B、Other than the possibility of a leak, there is no realistic pollution threat posed to the lake by the pipeline's construction.
C、There is no reason to believe that the leak-preventing technology would be ineffective when installed in the pipeline in Lake Konfa.
D、Damage to the lake's fish populations would be the only harm that a leak of oil from the pipeline would cause.
E、The species of fish that are present in Lake Konfa now are the same as those that were in the lake before it was affected by pollution.

答案:

B
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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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4982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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1904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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425340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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432477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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