问答

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[Critical Reasoning]

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题目：

Which of the following most logically completes the passage?
 
A certain tropical island received food donations in the form of powdered milk for distribution to its poorest residents, who were thought to be malnourished.  Subsequently, the rate of liver cancers among those islanders increased sharply.  The donated milk was probably to blame: recent laboratory research on rats has shown that rats briefly exposed to the substances aflatoxin tend to develop liver cancer when fed casein, a milk protein.  This result is relevant because _______.

选项:

A、in the tropics, peanuts, a staple of these island residents, support a mold growth that produces aflatoxin
B、the liver is more sensitive to carcinogens, of which aflatoxin may be one, than most other bodily organs
C、casein is not the only protein contained in milk
D、powdered milk is the most appropriate form in which to send milk to a tropical destination
E、the people who were given the donated milk had been screened for their ability to digest milk

答案:

A
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[Sentence Correction]

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题目：

In 1713, Alexander Pope began his translation of the Iliad, a work that, taking him seven years until completion, and that literary critic Samuel Johnson, Pope's contemporary, pronounced the greatest translation in any language.

选项:

A、his translation of the Iliad, a work that, taking him seven years until completion, and that literary critic Samuel Johnson, Pope's contemporary, pronounced
B、his translation of the Iliad, a work that took him seven years to complete and that literary critic Samuel Johnson, Pope's contemporary, pronounced
C、his translation of the Iliad, a work that had taken seven years to complete and that literary critic Samuel Johnson, Pope's contemporary, pronounced it as
D、translating the Iliad, a work that took seven years until completion and that literary critic Samuel Johnson, Pope's contemporary, pronounced it as
E、translating the Iliad, a work that had taken seven years to complete and literary critic Samuel Johnson, Pope's contemporary, pronounced it

答案:

B
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[Sentence Correction]

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题目：

Since 1990 the global economy has grown more than it did during the 10,000 years from the beginning of agriculture to 1950.

选项:

A、Since 1990 the global economy has grown more than it did during the 10,000 years from the beginning of agriculture
B、Since 1990 the growth of the global economy has been more than that during 10,000 years, from when agriculture began
C、The growth of the global economy since 1990 exceeds that which had been for 10,000 years from the beginning of agriculture
D、The growth of the global economy since 1990 exceeds what it has been for 10,000 years, from when agriculture began
E、The growth of the global economy since 1990 exceeds what it did for the 10,000 years from the beginning of agriculture

答案:

A
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[Problem Solving]

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题目：

The letters D, G, I, I, and T can be used to form 5-letter strings such as DIGIT or DGIIT. Using these letters, how many 5-letter strings can be formed in which the two occurrences of the letter I are separated by at least one other letter?

选项:

A、12
B、18
C、24
D、36
E、48

答案:

D
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[Reading Comprehension]

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文章：

The United States government has a long-standing policy of using federal funds to keep small business viable.  The Small Business Act of 1953 authorized the Small Business Administration (SBA) to enter into contracts with government agencies having procurement powers and to arrange for fulfillment of these contracts by awarding subcontracts to small businesses.  In the mid-1960's, during the war on poverty years, Congress hoped to encourage minority entrepreneurs by directing such funding to minority businesses.  At first this funding was directed toward minority entrepreneurs with very low incomes.  A 1967 amendment to the Economic Opportunity Act directed the SBA to pay special attention to minority-owned businesses located in urban or rural areas characterized by high proportions of unemployed or low-income individuals.  Since then, the answer given to the fundamental question of who the recipients should be--the most economically disadvantaged or those with the best prospects for business success--has changed, and the social goals of the programs have shifted, resulting in policy changes.
 
The first shift occurred during the early 1970's.  While the goal of assisting the economically disadvantaged entrepreneur remained, a new goal emerged:  to remedy the effects of past discrimination.  In fact, in 1970 the SBA explicitly stated that their main goal was to increase the number of minority-owned businesses.  At the time, minorities constituted seventeen percent of the nation's population, but only four percent of the nation's self-employed.  This ownership gap was held to be the result of past discrimination.  Increasing the number of minority-owned firms was seen as a way to remedy this problem.  In that context, providing funding to minority entrepreneurs in middle- and high-income brackets seemed justified.
 
In the late 1970's, the goals of minority-business funding programs shifted again.  At the Minority Business Development Agency, for example, the goal of increasing numbers of minority-owned firms was supplanted by the goal of creating and assisting more minority-owned substantive firms with future growth potential.  Assisting manufacturers or wholesalers became far more important than assisting small service businesses.  Minority-business funding programs were now justified as instruments for economic development, particularly for creating jobs in minority communities of high unemployment.

题目：

According to the passage, in 1970 funding to minority entrepreneurs focused primarily on which of the following?

选项:

A、Alleviating chronic unemployment in urban areas
B、Narrowing the ownership gap
C、Assisting minority-owned businesses with growth potential
D、Awarding subcontracts to businesses that encouraged community development
E、Targeting the most economically disadvantaged minority-owned businesses

答案:

B
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[Sentence Correction]

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题目：

Only seven people this century have been killed by the great white shark,  the man-eater of the movies—less than those killed by bee stings.

选项:

A、movies—less than those
B、movies—fewer than have been
C、movies, which is less than those
D、movies, a number lower than the people
E、movies, fewer than the ones

答案:

B
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[Reading Comprehension]

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文章：

A recent study has provided clues to predator-prey dynamics in the late Pleistocene era.  Researchers compared the number of tooth fractures in present-day carnivores with tooth fractures in carnivores that lived 36,000 to 10,000 years ago and that were preserved in the Rancho La Brea tar pits in Los Angeles.  The breakage frequencies in the extinct species were strikingly higher than those in the present-day species.
 
In considering possible explanations for this finding, the researchers dismissed demographic bias because older individuals were not overrepresented in the fossil samples.  They rejected preservational bias because a total absence of breakage in two extinct species demonstrated that the fractures were not the result of abrasion within the pits.  They ruled out local bias because breakage data obtained from other Pleistocene sites were similar to the La Brea data.  The explanation they consider most plausible is behavioral differences between extinct and present-day carnivores--in particular, more contact between the teeth of predators and the bones of prey due to more thorough consumption of carcasses by the extinct species.  Such thorough carcass consumption implies to the researchers either that prey availability was low, at least seasonally, or that there was intense competition over kills and a high rate of carcass theft due to relatively high predator densities.

题目：

The primary purpose of the passage is to

选项:

A、present several explanations for a well-known fact
B、suggest alternative methods for resolving a debate
C、argue in favor of a controversial theory
D、question the methodology used in a study
E、discuss the implications of a research finding

答案:

E
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[Sentence Correction]

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题目：

A South American bird that forages for winged termites and other small insects while swinging upside down form the foliage of tall trees, the graveteiro belongs to the ovenbird family, a group of New World tropical birds that includes more than 230 species and that are represented in virtually every kind of habitat.

选项:

A、graveteiro belongs to the ovenbird family, a group of New World tropical birds that includes more than 230 species and that are
B、graveteiro belongs to the ovenbird family, a group of New World tropical birds that includes more than 230 species and  is
C、graveteiro belongs to the ovenbird family, a group of New World tropical birds that include more than 230 species and  is
D、graveteiro, which belongs to the ovenbird family, a group of New World tropical birds that includes more than 230 species and that are
E、graveteiro, which belongs to the ovenbird family, a group of New World tropical birds that includes more than 230 species and is

答案:

B
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[Reading Comprehension]

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文章：

    Recently biologists have been interested in a tide-associated periodic behavior displayed by the diatom Hantzschia virgata, a microscopic golden-brown alga that inhabits that portion of a shoreline washed by tides (the intertidal zone).Diatoms of this species, sometimes called "commuter" diatoms, remain burrowed in the sand during high tide, and emerge on the sand surface during the daytime low tide. Just before the sand is inundated by the rising tide, the diatoms burrow again. Some scientists hypothesize that commuter diatoms know that it is low tide because they sense an environmental change, such as an alteration in temperature or a change in pressure caused by tidal movement. However, when diatoms are observed under constant conditions in a laboratory, they still display periodic behavior, continuing to burrow on schedule for several weeks. This indicates that commuter diatoms, rather than relying on environmental cues to keep time, possess an internal pacemaker or biological clock that enables them to anticipate periodic changes in the environment. A commuter diatom has an unusually accurate biological clock, a consequence of the unrelenting environmental pressures to which it is subjected; any diatoms that do not burrow before the tide arrives are washed away.

    This is not to suggest that the period of this biological clock is immutably fixed. Biologists have concluded that even though a diatom does not rely on the environment to keep time, environmental factors—including changes in the tide's hydrostatic pressure, salinity, mechanical agitation, and temperature—can alter the period of its biological clock according to changes in the tidal cycle. In short, the relation between an organism's biological clock and its environment is similar to that between a wristwatch and its owner: the owner cannot make the watch run faster or slower, but can reset the hands. However, this relation is complicated in intertidal dwellers such as commuter diatoms by the fact that these organisms areexposed to the solar-day cycle as well as to the tidal cycle, and sometimes display both solar-day and tidal periods in a single behavior. Commuter diatoms, for example, emerge only during those low tides that occur during the day.

题目：

The passage suggests which of the following about the accuracy of the commuter diatom's biological clock?

选项:

A、The accuracy of the commuter diatom's biological clock varies according to changes in the tidal cycle.
B、The unusual accuracy that characterizes the commuter diatom's biological clock is rare among intertidal species.
C、The commuter diatom's biological clock is likely to be more accurate than the biological clock of a species that is subject to less intense environmental pressures.
D、The commuter diatom's biological clock tends to be more accurate than the biological clocks of most other species because of the consistency of the tidal cycle.
E、The accuracy of the commuter diatom's biological clock tends to fluctuate when the diatom is observed under variable laboratory conditions.

答案:

C
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[Sentence Correction]

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题目：

The Arthritis Research Institute of America advises women of color that they have twice the likelihood to get osteoarthritis of the knee as do White women.

选项:

A、that they have twice the likelihood to get osteoarthritis of the knee as do White women
B、that they are twice as likely as White women to get osteoarthritis of the knee
C、that their likelihood of getting osteoarthritis of the knee is twice as much as White women
D、of being twice as likely as White women to get osteoarthritis of the knee
E、of having twice the likelihood of getting osteoarthritis of the knee as White women

答案:

B
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1284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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3626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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4000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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1333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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2984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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2067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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1330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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1398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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330144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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337270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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