2021美国学术能力评估考试（SAT）真题模拟04-09

1、Four points lie on a circle. How many different triangles can be drawn with three of these points as vertices?（单选题）

A. 4

B. 5

C. 6

D. 7

E. 8

试题答案：A

2、In the figure above, if the coordinates of points P and Q are multiplied together, the result will be closest to which of the following points?（单选题）

A. A

B. B

C. C

D. D

E. E

试题答案：A

3、Three fair coins are tossed at the same time. What is the probability that all three coins will come up heads or all will come up tails?（单选题）

A. 1/8

B. 1/6

C. 1/4

D. 1/3

E. 3/8

试题答案：C

4、Geological evidence suggests that the earth’s magnetic polarity has switched back and forth many times over the millennia; such ______in the magnetic field may affect the ability of our planet to ward off cosmic radiation.（单选题）

A. intensifications

B. justifications

C. records

D. correlations

E. fluctuations

试题答案：E

5、Which of the following must be true?
I. a Φ b=b Φ a
II. a Φ (a + 1) = a²
III. a/2 Φ b/2 = aΦb/2（单选题）

A. I only

B. II only

C. III only

D. I and III only

E. II and III only

试题答案：B