gre最新练习题.doc

练习题十 239 99年4月 SECTION 1 Time-30minutes 30 Questions 5y= 15 x=2y O is the center of the circle and the perimeter of ? AOB is 6. 2. The circumference of the 12 circle Ken ’s monthly take-home pay isw dollars. After he pays for food and rent, he has x dollars left –x 4 38 715 13?? 14)2 )(2(???yxyx 5. 224yx? 8 2 The operation ? is defined for all positive numbers r and t byr ? t=t rttr?? 2)( 7. 71? 37 37? 71 8. AB BD BC DC 9. (250)(492) 4 000 ,492 10. xy 11. The number of prime The number of prime numbers between 70 numbers between 30 and 76 and 36 6<x<7y=8 x KLNP isa square with perimeter 128. 13. MQ 42 32x? 1+3x 练习题十 240 The median salary for professional group A is $40,610. The median salary for professional group B is $40,810. 15. The median salary for $40,710 groups A and bined 16. The water level ina tank is lowered by6 inches, then raised by2 18 inches, and then lowered by4 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? (A)2 11?x (B)2 11?x (C)2 16?x (D)2 16?x (E)2 118 ?x 17. In the figure above, M, N, and P are midpoints of the sides of an equilateral triangle whose perimeter is 18. What is the perimeter of the shaded region? (A) 2 (B) 3 (C)2 14 (D) 6 (E) 9 18. Which of the following sets of number is has the greatest standard deviation? (A) 2, 3,4 (B) , 3, (C) 1, , (D) – 2, 0,2 (E) 20, 21, 19. If x, y, and z represent consecutive integers, and x <y <z, which of the following equals y? Ⅰ.x+1Ⅱ.2 zx?Ⅲ.3 zyx??(A) Ⅰ only (B) Ⅰ and Ⅱ only (C) Ⅰ and Ⅲ only (D) Ⅱ and Ⅲ only (E) Ⅰ,Ⅱ and Ⅲ 20. When 9 students took a zoology quiz with a possible score of0 to 10, inclusive, there average (arithmetic mean) score was . Ifa tenth student takes the same quiz, what will be the least possible average score on the quiz for all 10 students? (A) (B) (C) (D) (E) 练习题十 241 Questions 21-25 refer to th