问答

1答疑

[Data Sufficiency]

试题详情

题目:

  Number Studying
Biology
Number Not
Studying Biology
Total
Number
of Boys
    18
Number
of Girls
     
Total 26    

The table above shows the number of students in a certain high school class who are boys and the number of students in the class who are studying biology. What is the total number of students in the class?

(1)   Of the boys in the class, 15 are studying biology.
(2)   The number of girls in the class is twice the number of students in the class who are not studying biology.

选项:

答案:

B
1答疑

[Problem Solving]

试题详情

题目:

The diagram shows a shaded 9-sided polygon and 9 unshaded isosceles triangles. For each isosceles triangle, the longest side is a side of the shaded polygon and the two sides of equal length are extensions of the two adjacent sides of the shaded polygon.

The figure shown above consists of a shaded 9-sided polygon and 9 unshaded isosceles triangles. For each isosceles triangle, the longest side is a side of the shaded polygon and the two sides of equal length are extensions of the two adjacent sides of the shaded polygon. What is the value of a ?

选项:

A、100
B、105
C、110
D、115
E、120

答案:

A
1答疑

[Data Sufficiency]

试题详情

题目:

For a convention, a hotel charges a daily room rate of $120 for 1 person and x dollars for each additional person.  What is the charge for each additional person?
(1)     The daily cost per person for 4 people sharing the cost of a room equally is $45.
(2)   The daily cost per person for 2 people sharing the cost of a room equally is $25 more than the corresponding cost for 4 people.

选项:

答案:

D
1答疑

[Data Sufficiency]

试题详情

题目:

If the average (arithmetic mean) of four different numbers is 30, how many of the numbers are greater than 30?
(1)     None of the four numbers is greater than 60.
(2)     Two of the four numbers are 9 and 10, respectively.

选项:

答案:

C
1答疑

[Problem Solving]

试题详情

题目:

In the xy-plane, the points (c, d ) , (c, -d ), and (-c, -d ) are three vertices of a certain square. If and , which of the following points is in the same quadrant as the fourth vertex of the square?

选项:

A、(-5, -3)
B、(-5, 3)
C、(5, -3)
D、(3, -5)
E、(3, 5)

答案:

E
1答疑

[Problem Solving]

试题详情

题目:

A rancher is constructing a fence by stringing wire between posts 20 feet apart. If the fence is 400 feet long, how many posts must the rancher use?

选项:

A、A. 18
B、B. 19
C、C. 20
D、D. 21
E、E. 22

答案:

D
1答疑

[Critical Reasoning]

试题详情

题目:

A major health insurance company in Lagolia pays for special procedures prescribed by physicians only if the procedure is first approved as "medically necessary" by a company-appointed review panel.  The rule is intended to save the company the money it might otherwise spend on medically unnecessary procedures.  The company has recently announced that in order to reduce its costs, it will abandon this rule.
 
Which of the following, if true, provides the strongest justification for the company's decision?

选项:

A、Patients often register dissatisfaction with physicians who prescribe nothing for their ailments.
B、Physicians often prescribe special procedures that are helpful but not altogether necessary for the health of the patient.
C、The review process is expensive and practically always results in approval of the prescribed procedure.
D、The company's review process does not interfere with the prerogative of physicians, in cases where more than one effective procedure is available, to select the one they personally prefer.
E、The number of members of the company-appointed review panel who review a given procedure depends on the cost of the procedure.

答案:

C
1答疑

[Problem Solving]

试题详情

题目:

An integer greater than 1 is prime if it is divisible only by itself and 1. Is n prime?
(1) n is between 1 and 4.
(2) n2 − 5n + 6 = 0 

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:

D
1答疑

[Critical Reasoning]

试题详情

文章:


题目:

大众广泛认为,实施严格的环境制度会降低经济增长。但有一个事实反驳了这个假说:环境制度最严格的国家拥有着最快的经济增长。可是,这并不意味着环境制度促使经济增长,因为           

下面哪个选项,能够补完下面的论证?

选项:

A、A. 那些拥有最严格环境制度的国家也把财政经费大部分投资在教育和职业培训上了。
B、B. 就算是那些只有少量环境制度的国家的经济增长也比几乎没有环境制度的国家的经济增长要高。
C、C. 很多经济增长放缓的国家在考虑放宽他们的环境制度。
D、D.引入了更加严格的环境制度之后,很多国家实现了经济增长。
E、E. 就算是这些有少量环境制度的国家也有一些经济增长。

答案:

A
1答疑

[Problem Solving]

试题详情

题目:

A researcher plans to identify each participant in a certain medical experiment with a code consisting of either a single letter or a pair of distinct letters written in alphabetical order. What is the least number of letters that can be used if there are 12 participants, and each participant is to receive a different code?

选项:

A、4
B、5
C、6
D、7
E、8

答案:

B
0评分
1137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
3238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
3587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
1186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
2736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
1878浏览

[OG]

The primary purpose of the passage is to
为什么选E不选B
0评分
1206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
1265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
300623浏览

[Undefined]

Analytical!
请问may老师,这题该用什么思路来做?
0评分
307750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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