问答

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[Critical Reasoning]

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题目：

Which of the following most logically completes the argument?
 
A certain cultivated herb is one of a group of closely related plants that thrive in soil with high concentrations of metals that are toxic to most other plants.  Agronomists studying the herb have discovered that it produces large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert.  Possibly, therefore, the herb's high histidine production is what allows it to grow in metal-rich soils, a hypothesis that would gain support if ______.

选项:

A、histidine is found in all parts of the plant—roots, stem, leaves, and flowers
B、the herb's high level of histidine production is found to be associated with an unusually low level of production of other amino acids
C、others of the closely related group of plants are also found to produce histidine in large quantities
D、cultivation of the herb in soil with high concentrations of the metals will, over an extended period, make the soil suitable for plants to which the metals are toxic
E、the concentration of histidine in the growing herb declines as the plant approaches maturity

答案:

C
6答疑

[Critical Reasoning]

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题目：

Nitrogen dioxide is a pollutant emitted by automobiles.  Catalytic converters, devices designed to reduce nitrogen dioxide emissions, have been required in all new cars in Donia since 1993, and as a result, nitrogen dioxide emissions have been significantly reduced throughout most of the country.  Yet although the proportion of new cars in Donia's capital city has always been comparatively high, nitrogen dioxide emissions there have showed only an insignificant decline since 1993.
 
Which of the following, if true, most helps to explain the insignificant decline in nitrogen dioxide emissions in Donia's capital city?

选项:

A、More of the cars in Donia's capital city were made before 1993 than after 1993.
B、The number of new cars sold per year in Donia has declined slightly since 1993.
C、Pollutants other than nitrogen dioxide that are emitted by automobiles have also been significantly reduced in Donia since 1993.
D、Many Donians who own cars made before 1993 have had catalytic converters installed in their cars.
E、Most car trips in Donia's capital city are too short for the catalytic converter to reach its effective working temperature.

答案:

E
6答疑

[Critical Reasoning]

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题目：

From 1978 to 1988, beverage containers accounted for a steadily decreasing percentage of the total weight of household garbage in the United States.  The increasingly widespread practice of recycling aluminum and glass was responsible for most of this decline.  However, although aluminum recycling was more widely practiced in this period than glass recycling, it was found that the weight of glass bottles in household garbage declined by a greater percentage than the weight of aluminum cans.
 
Which of the following, if true of the United States in the period 1978 to 1988, most helps to account for the finding?

选项:

A、Glass bottles are significantly heavier than aluminum cans of comparable size.
B、Recycled aluminum cans were almost all beverage containers, but a significant fraction of the recycled glass bottles had contained products other than beverages.
C、Manufacturers replaced many glass bottles, but few aluminum cans, with plastic containers.
D、The total weight of glass bottles purchased by households increased at a slightly faster rate than the total weight of aluminum cans.
E、In many areas, glass bottles had to be sorted by color of the glass before being recycled, whereas aluminum cans required no sorting.

答案:

C
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[Sentence Correction]

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题目：

A surge in new home sales and a drop in weekly unemployment claims suggest that the economy might not be as weak as some analysts previously thought.

选项:

A、claims suggest that the economy might not be as weak as some analysts previously thought
B、claims suggests that the economy might not be so weak as some analysts have previously thought
C、claims suggest that the economy might not be as weak as have been previously thought by some analysts
D、claims, suggesting about the economy that it might not be so weak as previously thought by some analysts
E、claims, suggesting the economy might not be as weak as previously thought to be by some analysts

答案:

A
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[Problem Solving]

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题目：

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?

选项:

A、100% decrease
B、50% decrease
C、40% decrease
D、40% increase
E、50% increase

答案:

D
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[Sentence Correction]

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题目：

Authoritative parents are more likely than permissive parents to have children who as adolescents are self-confident, high in self-esteem, and responsibly independent.

选项:

A、Authoritative parents are more likely than permissive parents to have children who as adolescents are self-confident, high in self-esteem, and responsibly independent.
B、Authoritative parents who are more likely than permissive parents to have adolescent children that are self-confident, high in self-esteem, and responsibly independent.
C、Children of authoritative parents, rather than permissive parents, are the more likely to be self-confident, have a high self-esteem, and to be responsibly independent as adolescents.
D、Children whose parents are authoritative rather than being permissive, are more likely to have self-confidence, a high self-esteem, and be responsibly independent when they are an adolescent.
E、Rather than permissive parents, the children of authoritative parents are the more likely to have self-confidence, a high self-esteem, and to be responsibly independent as an adolescent.

答案:

A
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[Sentence Correction]

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题目：

Both the Federal Reserve's decision that borrowing rates be raised, along with investor's speculation that another increase might be on the way, helped bolster the dollar in recent weeks by making deposits more attractive.

选项:

A、that borrowing rates be raised, along with investor's speculation that another increase might be on the way, helped bolster the dollar in recent weeks by making
B、that borrowing rates be raised and investors' speculation of possibly another increase on the way helped to bolster the dollar in recent weeks because they made
C、to raise borrowing rates and investors' speculation that another increase might be on the way helped to bolster the dollar in recent weeks by making
D、to raise borrowing rates, along with investors' speculation that another increase might be on the way, helped bolster the dollar in recent weeks because it made
E、to raise borrowing rates and investors' speculation of possibly another increase on the way helped bolster the dollar in recent weeks because they made

答案:

C
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[Sentence Correction]

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题目：

Rising inventories, when unaccompanied correspondingly by increases in sales, can lead to production cutbacks that would hamper economic growth.

选项:

A、when unaccompanied correspondingly by increases in sales, can lead
B、when not accompanied by corresponding increases in sales, possibly leads
C、when they were unaccompanied by corresponding sales increases, can lead
D、if not accompanied by correspondingly increased sales, possibly leads
E、if not accompanied by corresponding increases in sales, can lead

答案:

E
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[Sentence Correction]

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题目：

Digging in sediments in northern China, evidence has been gathered by scientists suggesting that complex life-forms emerged much earlier than they had previously thought.

选项:

A、evidence has been gathered by scientists suggesting that complex life-forms emerged much earlier than they had
B、evidence gathered by scientists suggests a much earlier emergence of complex life-forms than had been
C、scientists have gathered evidence suggesting that complex life-forms emerged much earlier than
D、scientists have gathered evidence that suggests a much earlier emergence of complex life-forms than that which was
E、scientists have gathered evidence which suggests a much earlier emergence of complex life-forms than that

答案:

C
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[Sentence Correction]

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题目：

In no other historical sighting did Halley’s Comet cause such a worldwide sensation as did its return in 1910–1911.

选项:

A、did its return in 1910–1911
B、had its 1910–1911 return
C、in its return of 1910–1911
D、its return of 1910–1911 did
E、its return in 1910–1911

答案:

C
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443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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1487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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1674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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635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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1459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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1037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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690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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704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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165835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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172949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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