问答

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[Problem Solving]

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题目：

A company has assigned a distinct 3-digit code number to each of its 330 employees.  Each code number was formed from the digits
 
2, 3, 4, 5, 6, 7, 8, 9
 
and no digit appears more than once in any one code number.  How many unassigned code numbers are there?

选项:

A、6
B、58
C、174
D、182
E、399

答案:

A
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[Critical Reasoning]

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题目：

Until mow, only injectable vaccines against influenza have been available.  Parents are reluctant to subject children to the pain of injections, but adults, who are at risk of serious complications from influenza, are commonly vaccinated.  A new influenza vaccine, administered painlessly in a nasal spray, is effective for children.  However, since children seldom develop serious complications from influenza, no significant public health benefit would result from widespread vaccination of children using the nasal spray.
 
Which of the following is an assumption on which the argument depends?

选项:

A、Any person who has received the injectable vaccine can safely receive the nasal-spray vaccine as well.
B、The new vaccine uses the same mechanism to ward off influenza as jnjectable vaccines do.
C、The injectable vaccine is affordable for all adults.
D、Adults do not contract influenza primarily from children who have influenza.
E、The nasal spray vaccine is mot effective when administered to adults.

答案:

D
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[Sentence Correction]

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题目：

One of the earliest known birds with a beak and contour feathers, Confuciusornis sanctus, with large clawlike "thumbs" on its wings, which probably helped them to climb up to a launching position for flight.

选项:

A、with large clawlike 'thumbs' on its wings, which probably helped them to
B、with large clawlike 'thumbs' on their wings, which probably helped it to
C、had large clawlike 'thumbs' on its wings, which probably helped them
D、had large clawlike 'thumbs' on its wings, probably to help it
E、had large clawlike 'thumbs' on their wings, probably to help it

答案:

D
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[Problem Solving]

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题目：

选项:

A、0
B、
C、
D、
E、

答案:

A
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[Critical Reasoning]

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题目：

It is illegal to advertise prescription medications in Hedland except in professional medical journals or by mail directly to physicians.  A proposed law would allow general advertising of prescription medications.  Opponents object that, in general, laypersons lack the specialized knowledge to evaluate such advertisements and might ask their physicians for inappropriate medications.  But since physicians have the final say as to whether to prescribe a medication for a patient, the objection provides no grounds for concern.
 
Which of the following would it be most useful to establish in order to evaluate the argument?

选项:

A、Whether nonprescription medications can interact with and block the action of any prescription medications that could be advertised to the general public
B、Whether most prescription medication advertisements directed at the general public would be advertisements for recently developed medications newly available by prescription
C、Whether prescription medication advertisements directed at the general public would appear on television and radio as well as in print
D、Whether physicians are more likely to pay attention to advertising directed to the general public than to advertising directed to physicians
E、Whether physicians are likely to succumb to pressure from patients to prescribe inappropriate medications

答案:

E
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[Problem Solving]

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题目：

King School has an enrollment of 900 students. The school day consists of 6 class periods during which each class is taught by one teacher. There are 30 students per class. Each teacher teaches a class during 5 of the 6 class periods and has one class period free. No students have a free class period. How many teachers does the school have?

选项:

A、25
B、30
C、36
D、60
E、150

答案:

C
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[Problem Solving]

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题目：

If a committee of 3 people is to be selected from among 5 married couples so that the committee does not include two people who are married to each other, how many such committees are possible?
 

选项:

A、20
B、40
C、50
D、80
E、120

答案:

D
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[Reading Comprehension]

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文章：

Line The argument for “monetizing”—or putting a
monetary value on—ecosystem functions may be
stated thus: Concern about the depletion of natural
resources is widespread, but this concern, in the
(5) absence of an economic argument for conservation,
has not translated into significant conservational
progress. Some critics blame this impasse on
environmentalists, whom they believe fail to address
the economic issues of environmental degradation.
(10) Conservation can appear unprofitable when compared
with the economic returns derived from converting
natural assets (pristine coastlines, for example) into
explicitly commercial ones (such as resort hotels).
But according to David Pearce, that illusion stems
(15) from the fact that “services” provided by ecological
systems are not traded on the commodities market,
and thus have no readily quantifiable value. To
remedy this, says Pearce, one has to show that all
ecosystems have economic value—indeed, that all
(20) ecological services are economic services. Tourists
visiting wildlife preserves, for example, create
jobs and generate income for national economies;
undisturbed forests and wetlands regulate water
runoff and act as water-purifying systems, saving
(25) millions of dollars worth of damage to property
and to marine ecosystems. In Gretchen Daily’s
view, monetization, while unpopular with many
environmentalists, reflects the dominant role that
economic considerations play in human behavior,
(30) and the expression of economic value in a common
currency helps inform environmental decision-making
processes.

题目：

Which of the following can be inferred from the passage concerning the environmentalists mentioned in line 8?

选项:

A、They are organized in opposition to the generation of income produced by the sale of ecological services.
B、They are fewer in number but better organized and better connected to the media than their opponents.
C、They have sometimes been charged with failing to use a particular strategy in their pursuit of conservational goals.
D、They have been in the forefront of publicizing the extent of worldwide environmental degradation.
E、They define environmental progress differently and more conservatively than do other organized groups of environmentalists.

答案:

C
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[Problem Solving]

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题目：

The interior of a rectangular carton is designed by a certain manufacturer to have a volume of x cubic feet and a ratio of length to width to height of 3:2:2. In terms of x, which of the following equals the height of the carton, in feet?

选项:

A、
B、
C、
D、
E、

答案:

B
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[Data Sufficiency]

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题目：

Material A costs $3 per kilogram, and material B costs $5 per kilogram. If 10 kilograms of material K consists of x kilograms of material A and y kilograms of material B, is x ＞ y?

(1)y ＞ 4

(2)The cost of the 10 kilograms of material K is less than $40.

选项:

A、 Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B、 Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C、 BOTH statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D、 EACH statement ALONE is sufficient.
E、 Statements (1) and (2) TOGETHER are NOT sufficient.

答案:

B
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1932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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5020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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5706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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1911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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4129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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2895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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1914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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2003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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426940浏览

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Analytical!
请问may老师，这题该用什么思路来做？
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434078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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