问答

1答疑

[Critical Reasoning]

试题详情

题目:

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?

选项:

A、Whether there are insect pests that sometimes reduce feed-corn yields, but against which commonly used insecticides and the genetic modification are equally ineffective
B、Whether the price that farmers receive for feed corn has remained steady over the past few years
C、Whether the insecticides typically used on feed corn tend to be more expensive than insecticides typically used on other crops
D、Whether most of the farmers who tried the genetically modified corn last season applied more insecticide than was actually necessary
E、Whether, for most farmers who plant feed corn, it is their most profitable crop

答案:

D
1答疑

[Data Sufficiency]

试题详情

题目:

Is the standard deviation of the salaries of Company Y's employees greater than the standard deviation of the salaries of Company Z's employees?
(1)   The average (arithmetic mean) salary of Company Y's employees is greater than the average salary of Company Z's employees.
(2)   The median salary of Company Y's employees is greater than the median salary of Company Z's employees.

选项:

答案:

E
1答疑

[Problem Solving]

试题详情

题目:

For a finite sequence of nonzero numbers, the number of variations in sign is defined as the number of pairs of consecutive terms of the sequence for which the product of the two consecutive terms is negative. What is the number of variations in sign for the sequence 1, -3, 2, 5, -4, -6?

选项:

A、One 
B、Two 
C、Three 
D、Four 
E、Five

答案:

C
1答疑

[Problem Solving]

试题详情

题目:

In the figure, AB = AE = 8, BC = CD = 13, and DE = 2. What is the area of region ABCDE ?

选项:

A、76
B、84
C、92
D、100
E、108

答案:

D
1答疑

[Sentence Correction]

试题详情

题目:

Critical-thinking instruction is predicted on two assumptions:  that there are clearly identifiable thinking skills that students can be taught to recognize and apply appropriately, and if recognized and applied, students will become more effective thinkers.

选项:

A、if recognized and applied, students
B、if these skills are recognized and applied, that students
C、if students recognize and apply them, that they
D、that if recognized and applied, students
E、that if students recognize and apply these skills, they

答案:

E
1答疑

[Problem Solving]

试题详情

题目:

If ø is a function, does a ø 1 = 1 for all a?
(1) 1 ø a = 1 for all a.
(2) a ø b = b  ø a for all a and b

选项:

A、Aif statement (1) ALONE is sufficient to answer the question but statement (2) alone is not sufficient;
B、Bif statement (2) ALONE is sufficient to answer the question but statement (1) alone is not sufficient;
C、Cif the two statements TAKEN TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient;
D、Dif EACH statement ALONE is sufficient to answer the question;
E、Eif the two statements TAKEN TOGETHER are still NOT sufficient to answer the question.

答案:

C
1答疑

[Sentence Correction]

试题详情

题目:

Retail sales rose 0.8 of 1 percent in August, intensifying expectations that personal spending in the July–September quarter more than doubled that of the 1.4 percent growth rate in personal spending for the previous quarter.

选项:

A、that personal spending in the July–September quarter more than doubled that of
B、that personal spending in the July–September quarter would more than double
C、of personal spending in the July–September quarter, that it more than doubled
D、of personal spending in the July–September quarter more than doubling that of
E、of personal spending in the July–September quarter, that it would more than double that of

答案:

B
1答疑

[Data Sufficiency]

试题详情

题目:

In  

选项:

答案:

A
1答疑

[Problem Solving]

试题详情

题目:

How many different ways can 3 cubes be painted if each cube is painted one color and only the 3 colors red, blue, and green are available? (Order is not considered, for example, green, green, blue is considered the same as green, blue, green.) 

选项:

A、A 2
B、B 3
C、C 9
D、D 10
E、E 27

答案:

D
1答疑

[Critical Reasoning]

试题详情

题目:

Thyrian lawmaker: Thyria’s Cheese Importation Board inspects all cheese shipments to Thyria and rejects shipments not meeting specified standards. Yet only 1 percent is ever rejected. Therefore, since the health consequences and associated economic costs of not rejecting that 1 percent are negligible, whereas the board’s operating costs are considerable, for economic reasons alone the board should be disbanded.

Consultant: I disagree. The threat of having their shipments rejected deters many cheese exporters from shipping substandard product.

The consultant responds to the lawmaker’s argument by

选项:

A、rejecting the lawmaker’s argument while proposing that the standards according to which the board inspects imported cheese should be raised
B、providing evidence that the lawmaker’s argument has significantly overestimated the cost of maintaining the board
C、objecting to the lawmaker’s introducing into the discussion factors that are not strictly economic
D、pointing out a benefit of maintaining the board, which the lawmaker’s argument has failed to consider
E、shifting the discussion from the argument at hand to an attack on the integrity of the cheese inspectors

答案:

D
0评分
358浏览

[Undefined]

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?
0评分
1321浏览

[Undefined]

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
0评分
1498浏览

[Undefined]

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
0评分
579浏览

[Undefined]

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?
0评分
1340浏览

[GWD]

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
0评分
953浏览

[OG]

The primary purpose of the passage is to
为什么选E不选B
0评分
637浏览

[Undefined]

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
0评分
651浏览

[Undefined]

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
153443浏览

[Undefined]

Analytical!
请问may老师,这题该用什么思路来做?
0评分
160551浏览

[Undefined]

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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