2021美国学术能力评估考试（SAT）真题模拟09-11

1、If x-y = 3 and x+y = 5, what is the value of y?（单选题）

A. -4

B. -2

C. -1

D. 1

E. 2

试题答案：D

2、In how many different ways can five pupils be seated in four chairs?（单选题）

A. 20

B. 40

C. 60

D. 80

E. 120

试题答案：E

3、Effective emergency medical technicians must respond ______ to a patient in need and avoid working ______, erring in their haste.（单选题）

A. affably; gently

B. humanely; painstakingly

C. swiftly; meticulously

D. obstreperously; perfunctorily

E. exigently; cursorily

试题答案：E

4、A container holds 8 pints of a solution which is 25% acid. If 2 quarts of pure acid are added to the container, what percent of the resulting mixture is acid? (1 quart=2 pints)（单选题）

A. 50

B. 20

C. 40

D. 45

E. 35

试题答案：A

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