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题目：

Some anthropologists believe that the genetic homogeneity evident in the world's people is the result of a "population bottleneck"—at some time in the past our ancestors suffered an event, greatly reducing their numbers and thus our genetic variation.

选项:

A、at some time in the past our ancestors suffered an event, greatly reducing their numbers
B、that at some time in the past our ancestors suffered an event that greatly reduced their numbers
C、that some time in the past our ancestors suffered an event so that their numbers were greatly reduced,
D、some time in the past our ancestors suffered an event from which their numbers were greatly reduced
E、some time in the past, that our ancestors suffered an event so as to reduce their numbers greatly,

答案:

B
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题目：

Although the discount stores in Goreville's central shopping district are expected to close within five years as a result of competition from a SpendLess discount department store that just opened, those locations will not stay vacant for long.  In the five years since the opening of Colson's, a nondiscount department store, a new store has opened at the location of every store in the shopping district that closed because it could not compete with Colson's.
 
Which of the following, if true, most seriously weakens the argument?

选项:

A、Many customers of Colson's are expected to do less shopping there than they did before the SpendLess store opened.
B、Increasingly, the stores that have opened in the central shopping district since Colson's opened have been discount stores.
C、At present, the central shopping district has as many stores operating in it as it ever had.
D、Over the course of the next five years, it is expected that Goreville's population will grow at a faster rate than it has for the past several decades.
E、Many stores in the central shopping district sell types of merchandise that are not available at either SpendLess or Colson's.

答案:

B
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题目：

In general, jobs are harder to get in times of economic recession because many businesses cut back operations.  However, any future recessions in Vargonia will probably not reduce the availability of teaching jobs at government-funded schools.  This is because Vargonia has just introduced a legal requirement that education in government-funded schools be available, free of charge, to all Vargonian children regardless of the state of the economy, and that current student-teacher ratios not be exceeded.
 
Which of the following, if true, most strengthens the argument?

选项:

A、The current student-teacher ratio at Vargonia's government-funded schools is higher than it was during the most recent period of economic recession.
B、During recent periods when the Vargonian economy has been strong, almost 25 percent of Vargonian children have attended privately funded schools, many of which charge substantial fees.
C、Nearly 20 percent more teachers are currently employed in Vargonia's government-funded schools than had been employed in those schools in the period before the last economic recession.
D、Teachers in Vargonia's government-funded schools are well paid relative to teachers in most privately funded schools in Vargonia, many of which rely heavily on part-time teachers.
E、During the last economic recession in Vargonia, the government permanently closed a number of the schools that it had funded.

答案:

B
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题目：

In the mid-1970's, since birds were overcome by pollution, and routinely falling from the sky above Los Angeles freeways, this prompted officials in California to devise a plan that reduced automobile emissions.

选项:

A、since birds were overcome by pollution, and routinely falling from the sky above Los Angeles freeways, this prompted officials in California to devise a plan that reduced
B、since birds that had been overcome by pollution were routinely falling from the sky above Los Angeles freeways, it prompted officials in California to devise a plan that would reduce
C、birds had been overcome by pollution and routinely fell from the sky above Los Angeles freeways, prompting officials in California to devise a plan that reduced
D、birds overcome by pollution routinely fell from the sky above Los Angeles freeways, prompting officials in California to devise a plan to reduce
E、birds overcome by pollution and routinely falling from the sky above Los Angeles freeways were prompting officials in California to devise a plan to reduce

答案:

D
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题目：

Press Secretary:  Our critics claim that the President's recent highway project cancellations demonstrate a vindictive desire to punish legislative districts controlled by opposition parties.  They offer as evidence the fact that 90 percent of the projects canceled were in such districts.  But all of the canceled projects had been identified as wasteful in a report written by respected nonpartisan auditors.  So the President's choice was clearly motivated by sound budgetary policy, not partisan politics.
 
Which of the following is an assumption on which the press secretary's argument depends?

选项:

A、Canceling highway projects was not the only way for the President to punish legislative districts controlled by opposition parties.
B、The scheduled highway projects identified as wasteful in the report were not mostly projects in districts controlled by the President's party.
C、The number of projects canceled was a significant proportion of all the highway projects that were to be undertaken by the government in the near future.
D、The highway projects canceled in districts controlled by the President's party were not generally more expensive than the projects canceled in districts controlled by opposition parties.
E、Reports by nonpartisan auditors are not generally regarded by the opposition parties as a source of objective assessments of government projects.

答案:

B
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题目：

The budget for education reflects the administration's demand that the money is controlled by local school districts, but it can only be spent on teachers, not on books, computers, or other materials or activities.

选项:

A、 the money is controlled by local school districts, but it can only be spent
B、 the money be controlled by local school districts, but it allows them to spend the money only
C、 the money is to be controlled by local school districts, but allowing it only to be spent
D、 local school districts are in control of the money, but it allows them to spend the money only
E、 local school districts are to be in control of the money, but it can only spend it

答案:

B
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题目：

The Achaemenid empire of Persia reached the Indus Valley in the fifth century B.C., bringing the Aramaic script with it, from which was derived both northern and southern Indian alphabets.

选项:

A、 the Aramaic script with it, from which was derived both northern and
B、 the Aramaic script with it, and from which deriving both the northern and the
C、 with it the Aramaic script, from which derive both the northern and the
D、 with it the Aramaic script, from which derives both northern and
E、 with it the Aramaic script, and deriving from it both the northern and

答案:

C
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题目：

Running at their respective constant rates, machine X takes 2 days longer to produce w widgets than machine Y. At these rates, if the two machines together produce 5/4 w widgets in 3 days, how many days would it take machine X alone to produce 2w widgets?

选项:

A、4
B、6
C、8
D、10
E、12

答案:

E
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题目：

Sulfur dioxide, a major contributor to acid rain, is an especially serious pollutant because it diminishes the respiratory system's ability to deal with all other pollutants.

选项:

A、an especially serious pollutant because it diminishes the respiratory system's ability to deal
B、an especially serious pollutant because of diminishing the respiratory system's capability of dealing
C、an especially serious pollutant because it diminishes the capability of  the respiratory system in dealing
D、a specially serious pollutant because it diminishes the capability of  the respiratory system to deal
E、a specially serious pollutant because of diminishing the respiratory system's ability to deal

答案:

A
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题目：

In 1981 children in the United States spent an average of slightly less than two and a half hours a week doing household chores; by 1997 they had spent nearly sixhours a week.

选项:

A、chores; by 1997 they had spent nearly six hours a week
B、chores; by 1997 that figure had grown to nearly six hours a week
C、chores, whereas nearly six hours a week were spent in 1997
D、chores, compared with a figure of nearly six hours a week in 1997
E、chores, that figure growing to nearly six hours a week in 1997

答案:

B
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[Undefined]

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From the consecutive integers –10 to 10, inclusive, 20 integers are randomly chosen with repetitions allowed. What is the least possible value of the product of the 20 integers?
题干说连续的整数-10到10，但是计算时候为什么只取-10和10呀？
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[GWD]

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Which of the following statements about the modernization of the telephone exchange is supported by information in the passage?
这题不太理解 为什么A对C一定对（C包含A）？
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[GWD]

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The primary purpose of the passage is to
A为什么不对 没太理解老师视频中讲的“A需要进一步推理”
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[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A和B的表达式相乘？
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[Undefined]

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Analytical!
为什么条件（2）可以整除2
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[GWD]

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For any integer k greater than 1, the symbol k* denotes the product of all the fractions of the form 1/t, where t is an integer between 1 and k, inclusive.  What is the value of 5*/4*?
between and不是应该不算首末数字吗？
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1005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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[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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[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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[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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