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题目：

On account of a law passed in 1993, making it a crime punishable by imprisonment that a United States citizen hold gold in the form of bullion or coins, immigrants found that on arrival in the United States they had to surrender all of the gold they had brought with them.

选项:

A、On account of a law passed in 1993, making it a crime punishable by imprisonment that a United States citizen hold
B、With a law passed in 1933 that makes it a crime punishable by imprisonment that a United States citizen hold
C、A law passed in 1933 that made it a crime punishable by imprisonment for a United States citizen holding
D、Because of a law passed in 1933 making it a crime punishable by imprisonment for a United States citizen to hold
E、Due to a law being passed in 1933 that makes it a crime punishable by imprisonment for a United States citizen to hold

答案:

D
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[Sentence Correction]

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题目：

Since 1975 so many people have been moving to Utah such that Mormons who were once 75 percent of the population are now only accounting for half of it.

选项:

A、so many people have been moving to Utah such that Mormons who were once 75 percent of the population are now only accounting for half of it
B、many people have been moving to Utah, so Mormons once 75 percent of the population are now accounting for only half
C、that many people have been moving to Utah, such that the Mormons that were once 75 percent of the population are now accounting for only half of it
D、many people have been moving to Utah such that the Mormons, who once represented 75 percent of the population, now only account for half
E、so many people have been moving to Utah that the Mormons, who once represented 75 percent of the population, now account for only half

答案:

E
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[Critical Reasoning]

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题目：

It is widely assumed that people need to engage in intellectual activities such as solving crossword puzzles or mathematics problems in order to maintain mental sharpness as they age. In fact, however, simply talking to other people—that is, participating in social interaction, which engages many mental and perceptual skills—suffices. Evidence to this effect comes from a study showing that the more social contact people report, the better their mental skills.

Which of the following, if true, most seriously weakens the force of the evidence cited?

选项:

A、As people grow older, they are often advised to keep exercising their physical and mental capacities in order to maintain or improve them.
B、Many medical conditions and treatments that adversely affect a person’s mental sharpness also tend to increase that person’s social isolation.
C、Many people are proficient both in social interactions and in solving mathematical problems.
D、The study did not itself collect data but analyzed data bearing on the issue from prior studies.
E、The tasks evaluating mental sharpness for which data were compiled by the study were more akin to mathematics problems than to conversation.

答案:

B
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题目：

Navigators have known for thousands of years that the ocean has variable currents, but it is only in the last half century that a reasonably clear picture has emerged of the patterns and causes of ocean currents.

选项:

A、a reasonably clear picture has emerged of the patterns and causes of ocean currents
B、a reasonably clear picture of the patterns of ocean currents and their causes have emerged
C、a reasonably clear picture emerged of ocean currents, their patterns and the causes of them
D、there have emerged a reasonably clear picture of the patterns of ocean currents and what caused them
E、there had emerged a reasonably clear picture of the patterns of ocean currents and their causes

答案:

A
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题目：

Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.

选项:

A、 while at the same time they have introduced some 100,000 dangerous chemical pollutants, having
B、 while at the same time introducing some 100,000 dangerous chemical pollutants that have
C、 while they have introduced some 100,000 dangerous chemical pollutants at the same time, and have
D、 but introducing some 100,000 dangerous chemical pollutants at the same time that have
E、 but at the same time introduce some 100,000 dangerous chemical pollutants, having

答案:

B
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题目：

In the major cities of industrialized countries at the end of the nineteenth century, important public places such as theaters, restaurants, shops, and banks had installed electric lighting, but electricity was in less than one percent of homes, where lighting was still provided mainly by candles or gas.

选项:

A、 electricity was in less than one percent of homes, where lighting was still
B、 electricity was in less than one percent of homes and lighting still
C、 there were less than one percent of homes with electricity, where lighting was still being
D、 there was less than one percent of homes that had electricity, having lighting that was still
E、 less than one percent of homes had electricity, where lighting had still been

答案:

A
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题目：

Retail sales rose 8/10 of 1 percent in August, intensifying expectations that personal spending in the July-September quarter more than doubled that of the 1.4 percent growth rate in personal spending for the previous quarter.

选项:

A、that personal spending in the July-September quarter more than doubled that of
B、that personal spending in the July-September quarter would more than double
C、of personal spending in the July-September quarter, that it more than doubled
D、of personal spending in the July-September quarter, more than doubling that of
E、of personal spending in the July-September quarter, that it would more than double that of

答案:

B
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题目：

For the last five years the Dutch economy has grown faster than Britain, France, or Germany, with the unemployment rate having remained well below that of the other three countries.

选项:

A、Britain, France, or Germany, with the unemployment rate having remained
B、have those of Britain, France, or Germany, and the unemployment rate remaining
C、have Britain, France, and Germany, and the unemployment rate has remained
D、the economy of Britain, France, and Germany, with the unemployment rate that has remained
E、the economies of Britain, France, and Germany, and the unemployment rate has remained

答案:

E
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[Critical Reasoning]

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题目：

Kernland imposes a high tariff on the export of unprocessed cashew nuts in order to ensure that the nuts are sold to domestic processing plants.  If the tariff were lifted and unprocessed cashews were sold at world market prices, more farmers could profit by growing cashews.  However, since all the processing plants are in urban areas, removing the tariff would seriously hamper the government's effort to reduce urban unemployment over the next five years.
 
Which of the following, if true, most seriously weakens the argument?

选项:

A、Some of the by-products of processing cashews are used for manufacturing paints and plastics.
B、Other countries in which cashews are processed subsidize their processing plants.
C、More people in Kernland are engaged in farming cashews than in processing them.
D、Buying unprocessed cashews at lower than world market prices enables cashew processors in Kernland to sell processed nuts at competitive prices.
E、A lack of profitable crops is driving an increasing number of small farmers in Kernland off their land and into the cities.

答案:

E
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[Reading Comprehension]

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文章：

    Extensive research has shown that the effects of short-term price promotions on sales are themselves short-term. Companies' hopes that promotions might have a positive aftereffect have not been borne out for reasons that researchers have been able to identify. A price promotion entices only a brand's long-term or "loyal" customers; people seldom buy an unfamiliar brand merely because the price is reduced. They simply avoid paying more than they have to when one of their customary brands is temporarily available at a reduced price. A price promotion does not increase the number of long-term customers of a brand, as it attracts virtually no new customers in the first place. Nor do price promotions have lingering aftereffects for a brand, even negative ones such as damage to a brand's reputation or erosion of customer loyalty, as is often feared.

    So why do companies spend so much on price promotions? Clearly price promotions are generally run at a loss, otherwise there would be more of them. And the bigger the increase in sales at promotion prices, the bigger the loss. While short-term price promotions can have legitimate uses, such as reducing excess inventory, it is the recognizable increase in sales that is their main attraction to management, which is therefore reluctant to abandon this strategy despite its effect on the bottom line.

题目：

The passage suggests that evidence for price promotions' "effect on the bottom line" (in the highlighted text) is provided by

选项:

A、the lack of lingering aftereffects from price promotions
B、the frequency with which price promotions occur
C、price promotions' inability to attract new customers
D、price promotions' recognizable effect on sales
E、the legitimate uses to which management can put price promotions

答案:

B
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204浏览

[OG19]

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Each year for 4 years, a farmer increased the number of trees in a certain orchard by of the number of trees in the orchard the preceding year. If all of the trees thrived and there were 6,250 trees in the orchard at the end of the 4-year period, how many trees were in the orchard at the beginning of the 4-year period?
计算过程没有看懂，麻烦may老师再讲一遍
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151浏览

[OG]

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A sequence of numbers a1, a2, a3, . . . is defined as follows: a1 = 3, a2 = 5, and every term in the sequence after a2 is the product of all terms in the sequence preceding it, e.g., a3 = (a1)(a2) and a4 = (a1)(a2)(a3). If an = t and n ˃ 2, what is the value of an + 2 in terms of t ?
没有听懂an an+1 an+2怎么出来的
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123浏览

[GWD]

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In the rectangular coordinate system, points (4, 0) and (– 4, 0) both lie on circle C. What is the maximum possible value of the radius of C ?
这里的lie on的意思是两个点可以在圆上（相交）也可以在圆的上部（不相交）吗？
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201浏览

[OG]

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Thabo owns exactly 140 books, and each book is either paperback fiction, paperback nonfiction, or hardcover nonfiction. If he owns 20 more paperback nonfiction books than hardcover nonfiction books, and twice as many paperback fiction books as paperback nonfiction books, how many hardcover nonfiction books does Thabo own?
为什么hardcover fiction是0，没有想通是怎么判断的
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283浏览

[OG19]

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There are 10 books on a shelf, of which 4 are paperbacks and 6 are hardbacks. How many possible selections of 5 books from the shelf contain at least one paperback and at least one hardback?
为什么c（4，1）c（6，1）c（8，3）取出来的是不完整的
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353浏览

[Undefined]

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A company plans to assign identification numbers to its employees. Each number is to consist of four different digits from 0 to 9, inclusive, except that the first digit cannot be 0. How many different identification numbers are possible?
这个为什么不能是c（9，1）c（10，1）c（10，1）c（10，1）
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276浏览

[Undefined]

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If money is invested at r percent interest, compounded annually, the amount of the investment will double in approximately  years. If Pat's parents invested $5,000 in a long-term bond that pays 8 percent interest, compounded annually, what will be the approximate total amount of the investment 18 years later, when Pat is ready for college?
没有理解为什么题目意思是每70/8年翻倍一次，我的理解是这个翻倍是一次性的，在70/8年的时候
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326浏览

[Undefined]

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Scientists have modified feed corn genetically, increasing its resistance to insect pests. Farmers who tried out the genetically modified corn last season applied less insecticide to their corn fields and still got yields comparable to those they would have gotten with ordinary corn. Ordinary corn seed, however, costs less, and what these farmers saved on insecticide rarely exceeded their extra costs for seed. Therefore, for most feed-corn farmers, switching to genetically modified seed would be unlikely to increase profits.

Which of the following would it be most useful to know in order to evaluate the argument?
没有理解为什么D是对的，需要比较的不是普通种子需要的杀虫剂用量吗？为啥转基因corn的杀虫剂用量可以影响结论？
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388浏览

[Undefined]

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Between 1980 and 2000 the sea otter population of the Aleutian Islands declined precipitously. There were no signs of disease or malnutrition, so there was probably an increase in the number of otters being eaten by predators. Orcas will eat otters when seals, their normal prey, are unavailable, and the Aleutian Islands seal population declined dramatically in the 1980s. Therefore, orcas were most likely the immediate cause of the otter population decline.

Which of the following, if true, most strengthens the argument?
可以理解为什么C对，但是为什么E的slight decline是影响很小到可以忽略不计呢？就是小规模的食物减少也会引起seal减少，从而使orca吃otter
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300浏览

[Undefined]

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When there is less rainfall than normal, the water level of Australian rivers falls and the rivers flow more slowly. Because algae whose habitat is river water grow best in slow-moving water, the amount of algae per unit of water generally increases when there has been little rain. By contrast, however, following a period of extreme drought, algae levels are low even in very slow-moving river water.

Which of the following, if true, does most to explain the contrast described above?
为什么D选项河流短暂干了推出海藻死了，不算过度推理？可能干了很短时间但海藻没死呢？
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