GRE-93及答案解析.doc

1、GRE-93及答案解析(总分：25.00，做题时间：90 分钟)一、SECTION 1(总题数：22，分数：25.00)1. （分数：1.00）A.B.C.D.2.The median salary for professional group A is $40,610. The median salary for professsional group Bis $40,810.The median salaryfor groups A and $ 40,710B combined（分数：1.00）A.B.C.D.CORPORATE SUPPORT FOR THE ARTS BY SECTOR

2、 IN 1988 AND 1991（分数：3.00）(1).Approximately how many million dollars more did the wholesale sector contribute to the arts in 1988 than in 19917A. 10.4 B. 12.6 C. 14.0D. 16.5 E. 19.2（分数：1.00）A.B.C.D.E.(2).From 1988 to 1991 which corporate sector decreased its support for the arts by the greatest doll

3、ar amount?A. Services B. ManufacturingC. Retail D. WholesaleE. Other（分数：1.00）A.B.C.D.E.(3).Of the retail sectors 1991 contribution to the arts, went to symphony orchestras and （分数：1.00）A.B.C.D.E.3.a and b are positive integers（分数：1.00）A.B.C.D.4. （分数：1.00）A.B.C.D.5.If the radius of a circular region

4、were decreased by 20 percent, the area of the circular region would decrease by what percent?A. 16% B. 20% C. 36%D. 40% E. 44%（分数：1.00）A.B.C.D.E.6.How many students are either juniors or males or both?A. 678 B. 766 C. 948D. 1,130 E. 1,312（分数：1.00）A.B.C.D.E.7.If the cube of n is 180 greater than the

5、square of n, then n=A. 10 B. 9 C. 8D. 7 E. 6（分数：1.00）A.B.C.D.E.8.When 9 students took a zoology quiz with a possible score of 0 to 10 inclusive, their average (arithmetic mean) score was 7.5. If a tenth student takes the same quiz, what will be the least possible average score on the quiz for all 10

6、 students?A. 6.5 B. 6.75 C. 7.0D. 7.25 E. 7.5（分数：1.00）A.B.C.D.E.9.Carols age, in years, can be expressed by reversing the digits in her fathers age, in years. The sum of the digits in each age is 10.（分数：1.00）A.B.C.D.10.The water level in a tank is lowered by 6 inches, then raised by inches, and then

7、 lowered by 4 inches. If the water level was x inches before the changes in level, which of the following represents the water level, in inches, after the changes?（分数：1.00）A.B.C.D.E.11.The probability that events E and F will both occur is 0.42（分数：1.00）A.B.C.D.12.Josh works on the second floor of a

8、building. There are 10 doors to the building and 8 staircases from the first to the second floor. Josh decided that each day he would enter by one door and leave by a different one, and go up one staircase and down another. How many days could Josh do this before he had to repeat a path he had previ

9、ously taken?A. 80 B. 640 C. 800D. 5040 E. 6400（分数：1.00）A.B.C.D.E.13.Which of the following is an equation of a line that is perpendicular to the line whose equation is 2x+3y=4?Indicate all such equations.A. 3x+2y=4 B. 3x-2y=4C. 2x-3y=4 D. 4-3x=-2yE. 4+2x=3y（分数：1.00）14.Workers at Companies X and Y ar

10、e paid the same base hourly rate. Workers at Company X are paid 1.5 times the base hourly rate for each hour worked per week in excess of the first 37, while workers at Company Y are paid 1.5 times the base hourly rate for each hour worked per week in excess of the first 40. In a given week, how man

11、y hours must a Company X worker work in order to receive the same pay as a Company Y worker who works 46 hours?A. 46 B. 45 C. 44D. 43 E. 42（分数：1.00）A.B.C.D.E.15.If x is 1, 2, or 3 and y is either 2 or 4, then the product xy can have how many different possible values?A.Three B. Four C. FiveD. Six E.

12、 Seven（分数：1.00）A.B.C.D.E.（分数：2.00）(1).The ratio of the number of male freshmen to the number of female sophomores is approximatelyA. 2 to 1 B. 3 to 1 C. 3 to 2D. 4 to 1 E. 5 to 3（分数：1.00）A.B.C.D.E.(2).Which of the following can be inferred from the tables? The number of males majoring in physical sc

13、iences is greater than the number of females majoring in that area. Students majoring in either social sciences or physical sciences constitute more than 50 percent of the total enrollment. The ratio of the number of males to the number of females in the senior class is less than 2 to 1.A. only B. o

14、nly C. and D. and E. and （分数：1.00）A.B.C.D.E.16.If a is increased by 25% and b is decreased by 25%, the resulting numbers will be equal. What is the ratio of a tob?（分数：1.00）填空项 1:_17.In the figure above, M, N and P are midpoints of the sides of an equilateral triangle whose perimeter is 18. What is t

15、he perimeter of the shaded region?A. 2 B. 3 C. （分数：1.00）A.B.C.D.E.18. （分数：1.00）A.B.C.D.19.Which of the following sets of numbers has the greatest standard deviation?A. 2, 3, 4 B. 2.5, 3, 3.5C. 1, 1.25, 1.5 D. -2, 0, 2E. -20, 21, 21.5（分数：1.00）A.B.C.D.E.20. （分数：1.00）A.B.C.D.GRE-93答案解析(总分：25.00，做题时间：90

16、 分钟)一、SECTION 1(总题数：22，分数：25.00)1. （分数：1.00）A. B.C.D.解析：2.The median salary for professional group A is $40,610. The median salary for professsional group Bis $40,810.The median salaryfor groups A and $ 40,710B combined（分数：1.00）A.B.C.D. 解析：CORPORATE SUPPORT FOR THE ARTS BY SECTOR IN 1988 AND 1991（分数

17、3.00）(1).Approximately how many million dollars more did the wholesale sector contribute to the arts in 1988 than in 19917A. 10.4 B. 12.6 C. 14.0D. 16.5 E. 19.2（分数：1.00）A.B.C.D.E. 解析：(2).From 1988 to 1991 which corporate sector decreased its support for the arts by the greatest dollar amount?A. Ser

18、vices B. ManufacturingC. Retail D. WholesaleE. Other（分数：1.00）A.B. C.D.E.解析：(3).Of the retail sectors 1991 contribution to the arts, went to symphony orchestras and （分数：1.00）A. B.C.D.E.解析：3.a and b are positive integers（分数：1.00）A.B.C.D. 解析：4. （分数：1.00）A. B.C.D.解析：5.If the radius of a circular region

19、were decreased by 20 percent, the area of the circular region would decrease by what percent?A. 16% B. 20% C. 36%D. 40% E. 44%（分数：1.00）A.B.C. D.E.解析：6.How many students are either juniors or males or both?A. 678 B. 766 C. 948D. 1,130 E. 1,312（分数：1.00）A.B.C. D.E.解析：7.If the cube of n is 180 greater t

20、han the square of n, then n=A. 10 B. 9 C. 8D. 7 E. 6（分数：1.00）A.B.C.D.E. 解析：8.When 9 students took a zoology quiz with a possible score of 0 to 10 inclusive, their average (arithmetic mean) score was 7.5. If a tenth student takes the same quiz, what will be the least possible average score on the qui

21、z for all 10 students?A. 6.5 B. 6.75 C. 7.0D. 7.25 E. 7.5（分数：1.00）A.B. C.D.E.解析：9.Carols age, in years, can be expressed by reversing the digits in her fathers age, in years. The sum of the digits in each age is 10.（分数：1.00）A.B.C.D. 解析：10.The water level in a tank is lowered by 6 inches, then raised

22、 by inches, and then lowered by 4 inches. If the water level was x inches before the changes in level, which of the following represents the water level, in inches, after the changes?（分数：1.00）A. B.C.D.E.解析：11.The probability that events E and F will both occur is 0.42（分数：1.00）A.B.C.D. 解析：12.Josh wor

23、ks on the second floor of a building. There are 10 doors to the building and 8 staircases from the first to the second floor. Josh decided that each day he would enter by one door and leave by a different one, and go up one staircase and down another. How many days could Josh do this before he had t

24、o repeat a path he had previously taken?A. 80 B. 640 C. 800D. 5040 E. 6400（分数：1.00）A.B.C.D. E.解析：13.Which of the following is an equation of a line that is perpendicular to the line whose equation is 2x+3y=4?Indicate all such equations.A. 3x+2y=4 B. 3x-2y=4C. 2x-3y=4 D. 4-3x=-2yE. 4+2x=3y（分数：1.00）解析

25、14.Workers at Companies X and Y are paid the same base hourly rate. Workers at Company X are paid 1.5 times the base hourly rate for each hour worked per week in excess of the first 37, while workers at Company Y are paid 1.5 times the base hourly rate for each hour worked per week in excess of the

26、 first 40. In a given week, how many hours must a Company X worker work in order to receive the same pay as a Company Y worker who works 46 hours?A. 46 B. 45 C. 44D. 43 E. 42（分数：1.00）A.B. C.D.E.解析：15.If x is 1, 2, or 3 and y is either 2 or 4, then the product xy can have how many different possible

27、values?A.Three B. Four C. FiveD. Six E. Seven（分数：1.00）A.B.C. D.E.解析：（分数：2.00）(1).The ratio of the number of male freshmen to the number of female sophomores is approximatelyA. 2 to 1 B. 3 to 1 C. 3 to 2D. 4 to 1 E. 5 to 3（分数：1.00）A.B. C.D.E.解析：(2).Which of the following can be inferred from the tabl

28、es? The number of males majoring in physical sciences is greater than the number of females majoring in that area. Students majoring in either social sciences or physical sciences constitute more than 50 percent of the total enrollment. The ratio of the number of males to the number of females in th

29、e senior class is less than 2 to 1.A. only B. only C. and D. and E. and （分数：1.00）A.B.C.D.E. 解析：16.If a is increased by 25% and b is decreased by 25%, the resulting numbers will be equal. What is the ratio of a tob?（分数：1.00）填空项 1:_ （正确答案： ）解析：17.In the figure above, M, N and P are midpoints of the si

30、des of an equilateral triangle whose perimeter is 18. What is the perimeter of the shaded region?A. 2 B. 3 C. （分数：1.00）A.B.C.D.E. 解析：18. （分数：1.00）A. B.C.D.解析：19.Which of the following sets of numbers has the greatest standard deviation?A. 2, 3, 4 B. 2.5, 3, 3.5C. 1, 1.25, 1.5 D. -2, 0, 2E. -20, 21, 21.5（分数：1.00）A.B.C.D. E.解析：20. （分数：1.00）A.B. C.D.解析：