问答

1答疑

[Data Sufficiency]

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题目：

The diagram shows an obtuse triangle with sides x, y, and z. One needs to calculate the area of triangular region above or less than 20.

Is the area of the triangular region above less than 20 ?

  1. x2 + y2 ≠ z2
  2. x + y < 13

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 statements 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:

E
1答疑

[Sentence Correction]

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题目：

While most of the earliest known ball courts in Mesoamerica date to 900&#8211;400 b.c., waterlogged latex balls found at El Manati and representations of ballplayers painted on ceramics found at San Lorenzo attest to the fact that the Mesoamerican ballgame was well established by the mid-thirteenth century b.c.

选项:

A、waterlogged latex balls found at El Manati and representations of ballplayers painted on ceramics found at San Lorenzo attest
B、waterlogged latex balls found at El Manati and the painting of representations of ballplayers on ceramics found at San Lorenzo attests
C、waterlogged latex balls found at El Manati and ceramics painted with representations of ballplayers found at San Lorenzo attests
D、the finding of waterlogged latex balls at El Manati and the painting of representations of ballplayers on ceramics found at San Lorenzo attests
E、the finding of waterlogged latex balls at El Manati and of representations of ballplayers painted on ceramics at San Lorenzo attest

答案:

A
1答疑

[Sentence Correction]

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题目：

Certain pesticides can become ineffective if used repeatedly in the same place: one reason is suggested by the finding that there are much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals.

选项:

A、Certain pesticides can become ineffective if used repeatedly in the same place: one reason is suggested by the finding that there are much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicalsIf used repeatedly in the same place, one reason that certain pesticides can become ineffective is suggested by the finding that there are much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals
B、If used repeatedly in the same place, one reason certain pesticides can become ineffective is suggested by the finding that much larger populations of pesticide-degrading microbes are found in soils with a relatively long history of pesticide use than those that are free of such chemicals.
C、The finding that there are much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals is suggestive of one reason, if used repeatedly in the same place, certain pesticides can become ineffective
D、The finding of much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in those that are free of such chemicals suggests one reason certain pesticides can become ineffective if used repeatedly in the same place

答案:

A
1答疑

[Critical Reasoning]

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题目：

Clearbell Telephone provides slow-dialing (SD) service to customers for a low fee, and fast-dialing (FD) service to other customers who pay a somewhat higher fee. FD technology, however, is so efficient that it costs Clearbell substantially less per average call to provide than does SD. Nonetheless, accountants have calculated that Clearbell’s profits would drop if it provided FD to all its customers at the current low-fee rate.

Assume that installation costs for FD are insignificant if the customer already has SD service. Which of the following, if true about Clearbell, best explains the results of the accountants’ calculation?

选项:

A、The extra revenue collected from customers who pay the high fee is higher than the extra cost of providing SD to customers who pay the low fee.
B、The low fee was increased by 6 percent last year, whereas the higher fee was not increased last year.
C、Although 96 percent of customers regard FD service as reliable and more convenient than SD, fewer than 10 percent of them choose to pay the higher fee for FD service.
D、The company’s competitors generally provide business customers with FD service at low-fee rates.
E、Profits rose slightly each month for the first three months after FD was first offered to customers, then fell slightly each month for the succeeding three months.

答案:

A
1答疑

[Reading Comprehension]

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题目：

The passage suggests that Twigg believes that rats could not have spread the Black Death unless which of the following were true?

选项:

A、The rats escaped from ships that had been in Asia.
B、The rats were immune to the diseases that they carried.
C、The rats population was larger in medieval Europe than Twigg believes it actually was.
D、The rats population primarily infested densely populated areas.
E、The rats interacted with other animals that Twigg believes could have carried plague.

答案:

C
1答疑

[Problem Solving]

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题目：

If Whitney wrote the decimal representations for the first 300 positive integer multiples of 5 and did not write any other numbers, how many times would she have written the digit 5 ?

选项:

A、150
B、185
C、186
D、200
E、201

答案:

E
1答疑

[Sentence Correction]

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题目：

The Commerce Department reported that the nation's economy grew at a brisk annual pace of 3.7 percent in the second quarter, but that while businesses were expanding their production, unsold goods piled up on store shelves as consumer spending is slowed sharply.

选项:

A、unsold goods piled up on store shelves as consumer spending is slowed sharply
B、unsold goods were piling up on store shelves as consumer spending slowed sharply
C、unsold goods had piled up on store shelves with a sharp slowing of consumer spending
D、consumer spending was slowing sharply, with the piling up of unsold goods on store shelves
E、consumer spending has slowed sharply, with unsold goods piling up on store shelves

答案:

B
1答疑

[Data Sufficiency]

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题目：

In the xy-plane, the line k passes through the origin and through the point (a, b), where ab ≠ 0. Is b positive?
(1) The slope of line k is negative.
(2) a ＜ b
湡

选项:

答案:

C
1答疑

[Data Sufficiency]

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题目：

From Leland's gross pay of p  dollars last week, t  percent was deducted for taxes and then s dollars was deducted for savings.  What amount of Leland's gross pay last week remained after these two deductions?
(1)     = 244
(2)     pt = 7,552

选项:

答案:

C
1答疑

[Critical Reasoning]

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文章：

Community activist: If Morganville wants to keep its central shopping district healthy, it should prevent the opening of a huge SaveAll discount department store on the outskirts of Morganville. Records from other small towns show that whenever SaveAll has opened a store outside the central shopping district of a small town, within fi ve years the town has experienced the bankruptcies of more than a quarter of the stores in the shopping district.

题目：

The answer to which of the following would be most useful for evaluating the community activist’s reasoning?

选项:

A、Have community activists in other towns successfully campaigned against the opening of a SaveAll store on the outskirts of their towns? Do a large percentage of the residents of Morganville currently do almost all of their shopping at stores in Morganville? 
B、In towns with healthy central shopping districts, what proportion of the stores in those districts suffer bankruptcy during a typical fi ve-year period? 
C、What proportion of the employees at the SaveAll store on the outskirts of Morganville will be drawn from Morganville?
D、Do newly opened SaveAll stores ever lose money during their fi rst fi ve years of operation?

答案:

C
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1142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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3252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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3606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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1196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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2747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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1888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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1212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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1272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
0评分
302307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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309434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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