2021美国学术能力评估考试（SAT）真题模拟09-20

1、If [(x/100) – 1][(x/100) + 1] = kx² - 1, then k = ______.（单选题）

A. 0.1

B. 0.01

C. 0.001

D. 0.0001

E. 0.000001

试题答案：D

2、If a and b are both positive, a is odd, and b is even, which of the following must be odd?（单选题）

A. b + 2a

B. ab

C. b/a

D. a^b

E. b^a

试题答案：D

3、The percent increase in the number of students enrolled in advanced mathematics courses from 1993 to 1994 exceeded the percent increase from 1995 to 1996 by approximately what percent?（单选题）

A. 200

B. 133

C. 75

D. 67

E. 8

试题答案：E

4、If n⁸ = 480 and n⁷= 12m, what is the value of 3mn?（单选题）

A. 30

B. 60

C. 90

D. 120

E. 480

试题答案：D

5、X = {-4,-2, 1,3},  Y= {-1,4,5}. If x is a number from set X, and y is a number from set Y. The probability that x + y is positive is closest to ______.（单选题）

A. 0.5

B. 0.6

C. 0.7

D. 0.8

E. 0.9

试题答案：C