单选题 The ratio of the number of male freshmen to the number of female sophomores is approximately

• A. 2 to 1
• B. 3 to 1
• C. 3 to 2
• D. 4 to 1
• E. 5 to 3

单选题 Which of the following can be inferred from the tables?
Ⅰ The number of males majoring in physical sciences is greater than the number of females majoring in that area.
Ⅱ Students majoring in either social sciences or physical sciences constitute more than 50 percent of the total enrollment.
Ⅲ The ratio of the number of males to the number of females in the senior class is less than 2 to 1.

• A. Ⅰ only
• B. Ⅱ only
• C. Ⅰ and Ⅱ
• D. Ⅰ and Ⅲ
• E. Ⅱ and Ⅲ

单选题 Researchers at the Shimizu Institute in Japan believe it is possible to terraform Mars by making use of the planet's own resources and by introducing genetically altered life from Earth. They hope these actions will speed up the terraforming process, not just by adapting Mars to support Earth-life, but also by adapting Earthlife to exist on Mars. These experts think they can use the Martian geology itself to jump-start the planet. The theory is that detonation of thermonuclear devices deep in the Martian mountains will trigger eruptions of hot magma that would melt the frozen atmosphere, thereby releasing the components necessary for life. Which of the following, if true, would most weaken the experts' theory as explained in the last two sentences?

• A. Martian mountains are well-situated and easily accessible by remote mobility devices.
• B. Similar eruptions of magma on Earth have demonstrated the ability to enable life in hostile underwater environments.
• C. Mars' frozen atmosphere lacks the critical components necessary for life.
• D. Even if scientists could terraform Mars, the planet would eventually have all the same problems as Earth.
• E. Thermonuclear devices would be very dangerous to send to Mars.

单选题 If x+y=16, and if x²-y²=48, then x -y=

• A. 3
• B. 4
• C. 6
• D. 32
• E. 36

单选题 If the circumference of the circle above is 16π, and if the length of AC equals the length of BD, what is the length of AC? A. B.16 C. D. 32 E. 16π

单选题 If revenues of $196,000 from division A of Company X represent 28 percent of the total revenues of Company X for the year, what were the total revenues of Company X for the year?

• A. $141,100
• B. $ 272,000
• C. $ 413,300
• D. $ 596,100
• E. $ 700,000

单选题 If q workers can paint a house in d days, how many days will it take q+2 workers to paint the same house, assuming all workers paint at the same rate?

单选题 A certain doctor suggests that an individual's daily water intake be ounce per pound of body weight plus 8 ounces for every 25 pounds by which the individual exceeds his or her ideal weight. If this doctor suggests a daily water intake of 136 ounces for a particular 240-pound individual, how many pounds above his or her ideal weight is that individual? A.

单选题 In a normal distribution, 68% of the scores lie within one standard deviation of the mean. If the SAT scores of all the high school juniors in Center City followed a normal distribution with a mean of 500 and a standard deviation of 100, and if 10,200 students scored between 400 and 500, approximately how many students scored above 600?

• A. 2,400
• B. 4,800
• C. 5.100
• D. 7,200
• E. 9,600

多选题 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-3y=4
• D. 4-3x=-2y
• E. 4+2x=3y

单选题 If the radius of a circular region 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%