单项选择题

A certain spiral staircase is designed so that each step after the first one is turned 20°counterclockwise from the one immediately below it，how many of the steps make upcomplete revolutions（）

A. 18
B. 36
C. 38
D. 45
E. 50

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单项选择题
One month Mary used of her monthly salary for a payment and more than the car payment for rent．What fraction of her mommy salary did Mary use that month for the car payment and rent combined（）

A.A
B.B
C.C
D.D
E.E
单项选择题
If a certain company purchased its computer terminals for a total of$540，400 and each of the terminals was purchased for$350，how many terminals did the company purchase（）

A. 1，624
B. 1，544
C. 1，434
D. 1，384
E. 1，264
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