 # 2021美国学术能力评估考试（SAT）真题模拟09-15 1、Circles O and P intersect at exactly one point, as shown in the figure above. If the radius of circle O is 2 and the radius of circle P is 6, what is the circumference of any circle that has OP as a diameter?（单选题）

A. 4π

B. 8π

C. 12π

D. 16π

E. 64π

2、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

3、If 70% of the bananas in a particular harvest had an average (arithmetic mean) length of 7 inches and 30% of the bananas in that harvest had an average (arithmetic mean) length of 5 inches, what was the average (arithmetic mean) length, in inches, of all of the bananas in the harvest?（单选题）

A. 6.0

B. 6.2

C. 6.4

D. 6.6

E. 6.8

4、If (2y+ k) 2 =4y2-12y+ k2, what is the value of k?（单选题）

A. 3

B. 1

C. -1

D. -2

E. -3

5、Where is the best place to insert the following sentence? Incentives are used to influence people in many walks of life.（单选题）

A. after sentence 2

B. after sentence 3

C. after sentence 4

D. after sentence 5

E. after sentence 6   