问答

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[Critical Reasoning]

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题目：

Certain messenger molecules fight damage to the lungs from noxious air by telling the muscle cells encircling the lungs' airways to contract.  This partially seals off the lungs.  An asthma attack occurs when the messenger molecules are activated unnecessarily, in response to harmless things like pollen or household dust.
Which of the following, if true, points to the most serious flaw of a plan to develop a medication that would prevent asthma attacks by blocking receipt of any messages sent by the messenger molecules referred to above?

选项:

A、Researchers do not yet know how the body produces the messenger molecules that trigger asthma attacks.
B、Researchers do not yet know what makes one person's messenger molecules more easily activated than another's.
C、Such a medication would not become available for several years, because of long lead times in both development and manufacture.
D、Such a medication would be unable to distinguish between messages triggered by pollen and household dust and messages triggered by noxious air.
E、Such a medication would be a preventative only and would be unable to alleviate an asthma attack once it had started.

答案:

D
2答疑

[Critical Reasoning]

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题目：

Which of the following most logically completes the reasoning?
 
Either food scarcity or excessive hunting can threaten a population of animals.  If the group faces food scarcity, individuals in the group will reach reproductive maturity later than otherwise.  If the group faces excessive hunting, individuals that reach reproductive maturity earlier will come to predominate.  Therefore, it should be possible to determine whether prehistoric mastodons became extinct because of food scarcity or human hunting, since there are fossilized mastodon remains from both before and after mastodon populations declined, and ______.

选项:

A、there are more fossilized mastodon remains from the period before mastodon populations began to decline than from after that period
B、the average age at which mastodons from a given period reached reproductive maturity can be established from their fossilized remains
C、it can be accurately estimated from fossilized remains when mastodons became extinct
D、it is not known when humans first began hunting mastodons
E、climate changes may have gradually reduced the food available to mastodons

答案:

B
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[Problem Solving]

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题目：

If 30!/10! is written as the product of consecutive integers, the largest of which is 30, what is the smallest of the integers?

选项:

A、1
B、3
C、7
D、11
E、20

答案:

D
2答疑

[Reading Comprehension]

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文章：

Line In their study of whether offering a guarantee of
service quality will encourage customers to visit a
particular restaurant, Tucci and Talaga have found
that the effect of such guarantees is mixed. For
(5) higher-priced restaurants, there is some evidence
that offering a guarantee increases the likelihood of
customer selection, probably reflecting the greater
financial commitment involved in choosing an
expensive restaurant. For lower-priced restaurants,
(10) where one expects less assiduous service, Tucci and
Talaga found that a guarantee could actually have a
negative effect: a potential customer might think that
a restaurant offering a guarantee is worried about
its service. Moreover, since customers understand a
(15) restaurant’s product and know what to anticipate in
terms of service, they are empowered to question its
quality. This is not generally true in the case of skilled
activities such as electrical work, where, consequently,
a guarantee might have greater customer appeal.
(20) For restaurants generally, the main benefit of
a service guarantee probably lies not so much in
customer appeal as in managing and motivating staff.
Staff members would know what service standards
are expected of them and also know that the success
(25) of the business relies on their adhering to those
standards. Additionally, guarantees provide some
basis for defining the skills needed for successful
service in areas traditionally regarded as unskilled,
such as waiting tables.

题目：

It can be inferred that the author of the passage would agree with which of the following statements about the appeal of service guarantees to customers?

选项:

A、Such guarantees are likely to be somewhat more appealing to customers of restaurants than to customers of other businesses.
B、Such guarantees are likely to be more appealing to customers who know what to anticipate in terms of service.
C、Such guarantees are likely to have less appeal in situations where customers are knowledgeable about a business’s product or service.
D、In situations where a high level of financial commitment is involved, a service guarantee is not likely to be very appealing.
E、In situations where customers expect a high level of customer service, a service guarantee is likely to make customers think that a business is worried about its service.

答案:

C
2答疑

[Sentence Correction]

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题目：

The spectacular disintegration of a comet last year in full view of ground- and space-based telescopes provided new insights into how comets form and may thus force a rethinking of the role of comets in the delivery of organic compounds to the evolving Earth.

选项:

A、The spectacular disintegration of a comet last year in full view of ground- and space-based telescopes provided new insights into how comets form and may thus force
B、The spectacular disintegration of a comet last year in full view of ground- as well as space-based telescopes, provided new insights into how comets form and thus possibly forcing
C、When a comet's spectacular disintegration occurred in full view of ground- and space-based telescopes last year, it provided new insights into how comets form and thus may possibly force
D、Last year, in full view of ground- and space-based telescopes, a comet's spectacular disintegration provided new insights into how comets form and thus possibly forcing
E、Last year, in full view of ground- as well as space-based telescopes, the spectacular disintegration of a comet has provided new insights into how comets form and may thus force

答案:

A
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[Sentence Correction]

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题目：

According to the laws of this nation, individuals are minors until they reach the age of eighteen, although this is less in some countries and more in others.

选项:

A、although this is less in some countries and more in others
B、but this age is lower in some countries; higher in others
C、although in some countries, it is lower and in others it is higher
D、although it is less than that in some countries and more than that in others
E、but the relevant age is lower in some countries and higher in others

答案:

E
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[Problem Solving]

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题目：

The inside dimensions of a rectangular wooden box are 6 inches by 8 inches by 10 inches. A cylindrical canister is to be placed inside the box so that it stands upright when the closed box rests on one of its six faces. Of all such canisters that could be used, what is the radius, in inches, of the one that has maximum volume?

选项:

A、34
B、4
C、5
D、6
E、8

答案:

B
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[Data Sufficiency]

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题目：

If x^3y^4=5,000, is y=5?
(1)y is a positive integer.
(2)x is an integer.

选项:

答案:

C
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[Problem Solving]

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题目：

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?

选项:

A、$20,000$15,000
B、$12,000
C、$10,000
D、$9,000

答案:

A
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[Problem Solving]

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题目：

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?

选项:

A、75
B、120
C、210
D、246
E、252

答案:

D
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384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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1385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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1550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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595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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1383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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976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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651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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666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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157102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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164211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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