单项选择题

All three circles shown have radius 1 and are tangent to each other. Find the perimeter of the shaded region.（）

A. 3
B. π
C.
D. 2π
E. 3π

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单项选择题
The USS Mathematica sailed 6 knots north, then 5 knots east, then 2 knots south. How far, in knots, was the ship from her starting point（）

A、3
B、
C、
D、41
E、61
单项选择题
The company at which Mark is employed has 80 employees, each of whom has a different salary. Mark’s salary of $43,700 is the second-highest salary in the first quartile of the 80 salaries. If the company were to hire 8 new employees at salaries that are less than the lowest of the 80 salaries, what would Mark’s salary be with respect to the quartiles of the 88 salaries at the company, assuming no other changes in the salaries
A. The fourth-highest salary in the first quartile
B. The highest salary in the first quartile
C. The second-lowest salary in the second quartile
D. The third-lowest salary in the second quartile
E. The fifth-lowest salary in the second quartile
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