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题目：

Five hundred million different species of living creatures have appeared on Earth, nearly 99 percent of them vanishing.

选项:

A、Five hundred million different species of living creatures have appeared on Earth, nearly 99 percent of them vanishing.

B、Nearly 99 percent of five hundred million different species of living creatures that appeared on Earth have vanished.

C、Vanished are nearly 99 percent of the five hundred million different species of living creatures that appeared on Earth.

D、Of five hundred million different species of living creatures that have appeared on Earth, nearly 99 percent of them have vanished.

E、Of the five hundred million different species of living creatures that have appeared on Earth, nearly 99 percent have vanished.

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Among lower-paid workers, union members are less likely than nonunion members to be enrolled in lower-end insurance plans imposing stricter limits on medical services and requiring doctors to see more patients, and spend less time with each.

选项:

A、 imposing stricter limits on medical services and requiring doctors to see more patients, and spend

B、 imposing stricter limits on medical services, requiring doctors to see more patients, and spending

C、 that impose stricter limits on medical services, require doctors to see more patients, and spend

D、 that impose stricter limits on medical services and require doctors to see more patients, spending

E、 that impose stricter limits on medical services, requiring doctors to see more patients and spending

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While digging in the Egyptian desert, huge fossil bones have been found by paleontologists, which appears to have been the second most massive dinosaur that ever lived.

选项:

A、huge fossil bones have been found by paleontologists, which appears to have been

B、huge fossil bones have been found by paleontologists, which appear to be from

C、it appears that paleontologists have found huge fossil bones that are from

D、paleontologists have found huge fossil bones from what appears to be

E、paleontologists have found huge fossil bones, which are from what appear to be

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Since February, the Federal Reserve has raised its short-term interest rate target five times, and because of the economy's continued strength, analysts have been predicting for weeks that the target will be raised again in November.

选项:

A、because of the economy's continued strength, analysts have been predicting for weeks that the target will

B、with the economy's strength continuing, analysts predicted for weeks that the target

C、because the economy continues strong, analysts predicted for weeks that the target would

D、due to the economy's continued strength, analysts have been predicting for weeks that the target

E、due to the fact of the economy's continued strength, analysts predicted for weeks that the target will

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14答疑

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The average hourly wage of television assemblers in Vernland has long been significantly lower than that in neighboring Borodia. Since Borodia dropped all tariffs on Vernlandian televisions three years ago, the number of televisions sold annually in Borodia has not changed. However, recent statistics show a droip in the number of television assemblers in Borodia. Therefore, updated trade statistics will probably indicate that the number of televisions Borodia imports annually from Vernland has increased.

Which of the following is an assumption on which the argument depends?

选项:

A、The number of television assemblers in Vernland has increased by at least as much as the number of television assemblers in Borodia has decreased.

B、Televisions assembled in Vernland have features that televisions assembled in Borodia do not have.

C、The average number of hours it takes a Borodian television assembler to assemble a television has not decreased significantly during the past three years.

D、The number of televisions assembled annually in Vernland has increased significantly during the past three years.

E、The difference between the hourly wage of television assemblers in Vernland and the hourly wage of television assemblers in Borodia is likely to decrease in the next few years.

答案:

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题目：

Although improved efficiency in converting harvested trees into wood products

may reduce harvest rates, it will stimulate demand by increasing supply and

lowering prices, thereby boosting consumption.

选项:

A、in converting harvested trees into wood products may reduce harvest rates, it will stimulate demand by increasing supply and lowering prices, thereby boosting.

B、In converting harvested trees into wood products may reduce harvest rates, demand will be stimulated because of increasing supply and lowering prices, which boost.

C、Of converting harvested trees into wood products may reduce harvest rates, it will stimulate demand by increasing supply and lowering prices, which boosts.

D、Of harvested trees being converted into wood products may reduce harvest rates, it will stimulate demand, because it will increase supply and lower prices, thereby boosting.

E、When harvested trees are converted into wood products may reduce harvest rates, demand will be stimulated because of increasing supply and lowering prices, which boost.

答案:

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题目：

The market for recycled commodities like aluminum and other metals remain strong despite economic changes in the recycling industry.

选项:

A、commodities like aluminum and other metals remain

B、commodities like those of aluminum and other metals are remaining

C、commodities such as aluminum and other metals remains

D、commodities, such as aluminum and other metals, remain

E、commodities, like the commodities of aluminum and other metals, remains

答案:

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Having been named for a mythological nymph who cared for the infant Jupiter, the asteroid named Ida, in the middle of the belt of asteroids that orbit the Sun between Mars and Jupiter, was discovered in 1884.

选项:

A、Having been named for a mythological nymph who cared for the infant Jupiter, the asteroid named Ida, in the middle of the belt of asteroids that orbit the Sun between Mars and Jupiter, was discovered in 1884.

B、Discovered in 1884, the asteroid Ida, named for a mythological nymph who cared for the infant Jupiter, is in the middle of the belt of asteroids that orbit the Sun between Mars and Jupiter.

C、In the middle of the belt of asteroids that orbit the Sun between Mars and Jupiter, the asteroid Ida, discovered in 1884 and named for a mythological nymph who cared for the infant Jupiter.

D、The asteroid Ida, named for a mythological nymph who cared for the infant Jupiter and discovered in 1884, is in the middle of the belt of asteroids to orbit the Sun between Mars and Jupiter.

E、Ida, an asteroid discovered in 1884 and which was named for a mythological nymph who cared for the infant Jupiter, is in the middle of the belt of asteroids to orbit the Sun between Mars and Jupiter

答案:

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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:

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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:

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215浏览

[OG19]

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Each year for 4 years, a farmer increased the number of trees in a certain orchard by

\frac{1}{4}

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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156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 a_n = t and n ˃ 2, what is the value of a_{n + 2} in terms of t ?

没有听懂an an+1 an+2怎么出来的

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129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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210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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291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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363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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283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

1评分

332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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397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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308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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