[Two-part Analysis]
试题详情
题目：
选项:
A、1
B、2
C、3
D、4
E、5
F、6
答案:
D D
问答
1答疑
1答疑
[Problem Solving]
试题详情
题目：
C(m,n) = m! / [(m-n)! n!] for nonnegative integers m and n, m ≥n. If C(5,3) = C(5,x) and x ≠ 3, what is the value of x?
渦选项:
A、0
B、1
C、2
D、4
E、5
答案:
C
1答疑
[Critical Reasoning]
试题详情
题目：
Traverton’s city council wants to minimize the city’s average yearly expenditures on its traffic signal lights and so is considering replacing the incandescent bulbs currently in use with arrays of light-emitting diodes (LEDs) as the incandescent bulbs burn out. Compared to incandescent bulbs, LED arrays consume significantly less energy and cost no more to purchase. Moreover, the costs associated with the conversion of existing fixtures so as to accept LED arrays would be minimal.
Which of the following would it be most useful to know in determining whether switching to LED arrays would be likely to help minimize Traverton’s yearly maintenance costs?
Which of the following would it be most useful to know in determining whether switching to LED arrays would be likely to help minimize Traverton’s yearly maintenance costs?
选项:
A、Whether the expected service life of LED arrays is at least as long as that of the currently used incandescent bulbs
B、Whether any cities have switched from incandescent lights in their traffic signals to lighting elements other than LED arrays
C、Whether the company from which Traverton currently buys incandescent bulbs for traffic signals also sells LED arrays
D、Whether Traverton’s city council plans to increase the number of traffic signal lights in Traverton
E、Whether the crews that currently replace incandescent bulbs in Traverton’s traffic signals know how to convert the existing fixtures so as to accept LED arrays
答案:
A
1答疑
[Problem Solving]
试题详情
题目：
In the figure shown, if the area of the shaded region is 3 times the area of the smaller circular region, then the circumference of the larger circle is how many times the circumference of the smaller circle?
选项:
A、4
B、3
C、2
D、
E、
答案:
C
1答疑
[Critical Reasoning]
试题详情
题目：
In the last decade there has been a significant decrease in coffee consumption. During this same time, there has been increasing publicity about the adverse long-term effects on health of the caffeine in coffee. Therefore, the decrease in coffee consumption must have been caused by consumers’ awareness of the harmful effects of caffeine.
Which of the following, if true, most seriously calls into question the explanation above?
Which of the following, if true, most seriously calls into question the explanation above?
选项:
A、On average, people consume 30 percent less coffee today than they did 10 years ago.
B、Heavy coffee drinkers may have mild withdrawal symptoms, such as headaches, for a day or so after significantly decreasing their coffee consumption.
C、Sales of specialty types of coffee have held steady as sales of regular brands have declined.
D、The consumption of fruit juices and caffeine-free herbal teas has increased over the past decade.
E、Coffee prices increased steadily in the past decade because of unusually severe frosts in coffee-growing nations.
答案:
E
1答疑
[Problem Solving]
试题详情
题目：
Is the negative number x less than –1?
(1) 1x < 12
(2) 1x2 < 12
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:
B
1答疑
[Reading Comprehension]
试题详情
文章：
| Line | In terrestrial environments, gravity places |
| special demands on the cardiovascular systems of | |
| animals. Gravitational pressure can cause blood to | |
| pool in the lower regions of the body, making it | |
| (5) | difficult to circulate blood to critical organs such as |
| the brain. Terrestrial snakes, in particular, exhibit | |
| adaptations that aid in circulating blood against the | |
| force of gravity. | |
| The problem confronting terrestrial snakes is best | |
| (10) | illustrated by what happens to sea snakes when |
| removed from their supportive medium. Because the | |
| vertical pressure gradients within the blood vessels | |
| are counteracted by similar pressure gradients in | |
| the surrounding water, the distribution of blood | |
| (15) | throughout the body of sea snakes remains about |
| the same regardless of their orientation in space, | |
| provided they remain in the ocean. When removed | |
| from the water and tilted at various angles with the | |
| head up, however, blood pressure at their midpoint | |
| (20) | drops significantly, and at brain level falls to zero. |
| That many terrestrial snakes in similar spatial | |
| orientations do not experience this kind of circulatory | |
| failure suggests that certain adaptations enable them | |
| to regulate blood pressure more effectively in those | |
| (25) | orientations. |
| One such adaptation is the closer proximity of | |
| the terrestrial snake’s heart to its head, which helps | |
| to ensure circulation to the brain, regardless of the | |
| snake’s orientation in space. The heart of sea snakes | |
| (30) | can be located near the middle of the body, a |
| position that minimizes the work entailed in | |
| circulating blood to both extremities. In arboreal | |
| snakes, however, which dwell in trees and often | |
| assume a vertical posture, the average distance | |
| (35) | from the heart to the head can be as little as |
| 15 percent of overall body length. Such a location | |
| requires that blood circulated to the tail of the | |
| snake travel a greater distance back to the heart, | |
| a problem solved by another adaptation. When | |
| (40) | climbing, arboreal snakes often pause |
| momentarily to wiggle their bodies, causing waves | |
| of muscle contraction that advance from the lower | |
| torso to the head. By compressing the veins and | |
| forcing blood forward, these contractions | |
| (45) | apparently improve the flow of venous blood |
| returning to the heart. |
题目：
The author suggests that which of the following is a disadvantage that results from the location of a snake’s heart in close proximity to its head?
选项:
A、A decrease in the efficiency with which the snake regulates the flow of blood to the brain
B、A decrease in the number of orientations in space that a snake can assume without loss of blood flow to the brain
C、A decrease in blood pressure at the snake’s midpoint when it is tilted at various angles with its head up
D、An increase in the tendency of blood to pool at the snake’s head when the snake is tilted at various angles with its head down
E、An increase in the amount of effort required to distribute blood to and from the snake’s tail
答案:
E
1答疑
[Problem Solving]
试题详情
题目：
If a two-digit positive integer has its digits reversed, the resulting integer differs from the original by 27. By how much do the two digits differ?
选项:
A、3
B、4
C、5
D、6
E、7
答案:
A
1答疑
[Sentence Correction]
试题详情
题目：
Judge Bonham denied a motion to allow members of the jury to go home at the end of each day instead of to confine them to a hotel.
选项:
A、to allow members of the jury to go home at the end of each day instead of to confine them tothat would have allowed members of the jury to go home at the end of each day instead of confined to
B、under which members of the jury are allowed to go home at the end of each day instead of confining them in
C、that would allow members of the jury to go home at the end of each day rather than confinement in
D、to allow members of the jury to go home at the end of each day rather than be confined to
答案:
E
1答疑
[Data Sufficiency]
试题详情
题目：
What is the volume of the cube above?
(1) The surface area of the cube is 600 square inches.
(2) The length of diagonal AB is 
inches.
inches.选项:
答案:
D
0评分
1156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.
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
3293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
3642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
1212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
2778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
1903浏览
0评分
1221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
1287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
304817浏览
0评分
311943浏览
