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1、2021年GRE考试模拟卷（6）本卷共分为1大题50小题，作答时间为180分钟，总分100分，60分及格。一、单项选择题（共50题，每题2分。每题的备选项中，只有一个最符合题意） 1. 2.D. 5 E. 6 3.A cylinder of gas has height 48 inches, and the base has radius 2 feet 4.For the line with equation y=ax+b, ab0, the x-intercept is twice the y-intercept. 5.In 2000 Paul was twice as old as his
2、 brother Biko. In 2008 Pau I was only four years older than his brother. In what year was Biko bornA. 1990 B. 1992 C. 1996 D. 1998 E. 2000 6. 7.The median salary for professional group A is $40,610. The median salary for professsional group Bis $40,810. The median salary for groups A and $ 40,710 B
3、combined 8.a and b are positive integers 9. 10.If the radius of a circular region were decreased by 20 percent, the area of the circular region would decrease by what percentA. 16% B. 20% C. 36%D. 40% E. 44% 11.How many students are either juniors or males or bothA. 678B. 766C. 948D. 1,130E. 1,31212
4、.If the cube of n is 180 greater than the square of n, then n=A. 10 B. 9 C. 8D. 7 E. 6 13.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. 14.The probability that events E and F will both occur is 0.42 15.If x is 1,
5、 2, or 3 and y is either 2 or 4, then the product xy can have how many different possible valuesA.Three B. Four C. FiveD. SixE. Seven16.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=4 C. 2x-
6、3y=4 D. 4-3x=-2y E. 4+2x=3y17.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 18. 19.Which of the following sets of numbers has the greatest standard deviationA. 2, 3, 4 B. 2.5, 3, 3.5 C. 1, 1.25, 1.5D. -2, 0, 2E. -20, 21, 21.520. 2
7、1.If p and r are prime numbers，which of the following must also be primeA. prB. p+rC. pr+1D. p2+r2E. None of the above22.In how many of the integers between 1 and100 does the digit 5 occur exactly onceA. 10B. 18C. 19D. 20E. 2123.What is the least prime number greater than 83？A. 85B. 87C. 88D. 89E. 9
8、124.If r and 8 are positive integers，each greater than 1，and if 11(s-1)=13(r-1)，what is the least possible value of r+sA. 2B. 11C. 2D. 24E. 2625.If the sum of five consecutive even integers is 70，what is the value of the greatest of the five integersA. 12B. 14C. 18D. 20E. 2226. In the sum aboveif X
9、and Y each denote one of the digits from 0 to 9，inclusive，then X=A. 9B. 5C. 3D. 1E. 027.1113171923A decrease of l in which of the factorsabove would result in the greatest decrease in the productA. 11B. 13C. 17D. 19E. 2328.Which of the following numbers is NOT the sum of three consecutive odd intege
10、rsA. 15B. 75C. 123D. 297 E. 31329.If“and 6 are integers and a-b=6，then a+b CANNOT beA. 0B. less than 6C. greater than 6D. an even integerE. an odd integer30.If k is an integer and 5k20000，what is the greatest possible value of kA. 6B. 7C. 8D. 9E. 1031.A dresser drawer contains 15 garmentsIf40 percen
11、t of those garments are blouses，how many are not blousesA. 6B. 8C. 9D. 10E. 1232.Of the followingwhich is closest toA. 1B. 10C. 70D. 100 E. 70033.A positive integer with exactly two different divisors greater than 1 must beA. a primeB. an even integerC. a multiple of 3D. the square of a primeE. the
12、square of an odd integer34.Seven is equal to how many thirds of sevenA.B. 1C. 3D. 7E. 2135.Which of the following numbers is both a factor of 48 and a multiple of 6A. 2B. 8C. 12D. 16E. 1836.If p is a prime number greater than 11，and P is the sum of the two prime numbers x and y，then x could be which
13、 of the followingA. 2B. 5C. 7D. 9E. 1337.A. 1B. 2C. 4D. 8E. 1638.How many positive whole numbers less than 81 are NOT equal squares of whole numbersA. 9B. 70C. 71D. 72E. 7339.If n is any prime number greater than 2，which of the following CANNOT be a prime numberA. n-4B. n-3 C. n-1D. n+2E. n+540.3104
14、 is greater than 4103 by what percentA. 25%B. 75%C. D. 650%E. 750%41.Of the positive integers that are multiples of 30 and are less than or equal to 360，what fraction are multiples of 12 42.The sum of the first 50 positive integers is1，275What is the sum of the integers from 51 to 100，inclusiveA. 2，
15、525B. 2，550C. 3，25D. 3，775E. 5，05043.If 7l is an odd integer，then n2-1 must beA. a prime numberB. an odd integerC. divisible by 8D. a multiple of 2nE. a positive integer44.The sum of n different positive integers is less than 100What is the greatest possible value of nA. 10B. 11C. 12D. 13E. 1445.The
16、 product of two consecutive positive integers CANNOT beA. a prime numberB. divisible by 11C. a multiple of 13D. an even number less than 10E. a number having 4 as its units digit46.Each of the following numbers has two digits blotted out Which of the numbers could be the number of hours in x days，wh
17、ere x is an integerA. 25，06B. 50，26C. 56，02D. 62，50E. 65，2047.The number 1030is divisible by all of the following EXCEPTA. 250B. 125C. 32D. 16E. 648.What is the remainder when 63is divided by 8A. 5B. 3C. 2D. 1E. 049.How many of the positive integers less than 25 are 2 less than an integer multiple o
18、f 4A. TWOB. ThreeC. FourD. FiveE. Six50.When a certain number is divided by 7，the remainder iS 0If the remainder is not 0when the number is divided by 14，then the remainder must beA. 1B. 2C. 4D. 6E. 7第15页 共15页第 15 页 共 15 页第 15 页 共 15 页第 15 页 共 15 页第 15 页 共 15 页第 15 页 共 15 页第 15 页 共 15 页第 15 页 共 15 页第 15 页 共 15 页第 15 页 共 15 页第 15 页 共 15 页